CN116305715A - Method and device for calculating thermal contact resistance of chassis - Google Patents
Method and device for calculating thermal contact resistance of chassis Download PDFInfo
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- CN116305715A CN116305715A CN202211096770.1A CN202211096770A CN116305715A CN 116305715 A CN116305715 A CN 116305715A CN 202211096770 A CN202211096770 A CN 202211096770A CN 116305715 A CN116305715 A CN 116305715A
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Abstract
The invention provides a method and a device for calculating thermal contact resistance of a chassis. The method for calculating the thermal contact resistance of the chassis comprises the following steps: step 1, establishing a digital model of the same internal device and the same boundary condition according to an actual chassis; step 2, acquiring actual pretightening force of a cold guide plug-in unit fastened on a guide rail in an actual chassis and an actual temperature value of an actual internal device; step 3, adjusting the contact thermal resistance value in the digital model according to the actual temperature value to obtain the contact thermal resistance value when the temperature value of an internal device in the digital model is the same as the actual temperature value; and 4, establishing a first database with a mapping relation between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force. The thermal contact resistance of the case can be measured, the subsequent thermal design work of the ATR case and derivative products thereof using different plug-ins can be guided, and the design precision and design efficiency are improved.
Description
Technical Field
The invention relates to the technical field of chassis contact thermal resistance measurement, in particular to a chassis contact thermal resistance calculation method and a chassis contact thermal resistance calculation device.
Background
An ATR chassis (Air Transport Radio, air transporter radio equipment chassis) is a common chassis structure in the field of airborne, and is radiating by adopting a cooling mode of cooling and air cooling, the heat on the plug-in unit is firstly led to a guide rail of the chassis through a cooling substrate, and finally the heat is radiated into an air heat sink through a forced convection mode. In the heat transmission path, the thermal contact resistance between the cold guide substrate and the chassis guide rail is an important factor affecting heat transfer, and no method for measuring the thermal contact resistance exists in the prior art. When the thermal design is carried out on the chassis, the numerical value of the contact thermal resistance often adopts an empirical value, and is greatly different from a true value, so that the design precision is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for calculating the thermal contact resistance of a chassis aiming at the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a method for calculating the thermal contact resistance of a case comprises the following steps: step 1, establishing a digital model of the same internal device and the same boundary condition according to an actual chassis; step 2, acquiring actual pretightening force of a cold guide plug-in unit fastened on a guide rail in an actual chassis and an actual temperature value of an actual internal device; step 3, adjusting the contact thermal resistance value in the digital model according to the actual temperature value to obtain the contact thermal resistance value when the temperature value of an internal device in the digital model is the same as the actual temperature value; and 4, establishing a first database with a mapping relation between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force.
The technical scheme of the invention has the beneficial effects that: based on the concept of digital twin, the temperature value of an internal device when the ATR chassis is actually used is used as a target value, a digital simulation model of the chassis is established, the digital simulation model is a digital model, other boundaries of the model are kept consistent with the actual situation, only the thermal contact resistance value of the plug-in unit and the guide rail is changed, and the thermal contact resistance value when the temperature simulation value of the device is the same as the target value is found by an iterative operation method and can be used as the thermal contact resistance value of the chassis under the condition. After a series of testing and simulation works under different use conditions are carried out, the obtained contact thermal resistance value is built into a database, so that the contact thermal resistance of the case can be measured, the subsequent thermal design work of the ATR case and derivative products thereof using different plug-ins can be guided, and the design precision and design efficiency are improved.
Further, the step 4 includes: and 5, changing the actual pretightening force of the cold guide plug-in unit fastened on the guide rail in the actual chassis, repeating the steps 1 to 4, and establishing a second database with mapping relations between different pretightening forces and different contact thermal resistance values.
The beneficial effects of adopting the further technical scheme are as follows: testing under different pretightening forces is carried out to obtain a series of contact thermal resistance values, and a contact thermal resistance value database of the chassis is established; when the thermal design of the chassis using different plug-ins is developed subsequently, the thermal contact resistance data in the database can be adopted for simulation, so that on one hand, the precision of simulation calculation can be improved, and the efficiency of the thermal design can also be improved.
Further, the step 5 includes: step 6, obtaining a required temperature value meeting the heat dissipation requirement of an actual internal device; calculating the required temperature value through a digital model to obtain a required contact thermal resistance value; inquiring a required pretightening force corresponding to the required contact thermal resistance value in the second database; and installing the actual chassis according to the required pretightening force.
The beneficial effects of adopting the further technical scheme are as follows: when the temperature value of a device (an internal device) is wanted, the layout of a chassis plug-in (a cold conducting plug-in) can be directly changed in a digital twin model (a digital model), and the existing contact thermal resistance database is utilized for carrying out fine simulation design, so that the efficiency of thermal design can be improved, and the accuracy of a simulation result can be improved.
Further, step 1 is to build a 1:1 digital model of the same internal device and the same boundary condition according to the actual chassis through a simulation tool.
The beneficial effects of adopting the further technical scheme are as follows: the general software in the simulation field can be used as a simulation platform; the specific input is the environment temperature of the actual model, the size of the model and various physical parameters, and the calculation is performed by a solver of software. And a 1:1 digital model is built, so that the simulation degree of the digital model is improved, and the accuracy is improved.
Further, the contact thermal resistance value obtained when the temperature value of the internal device in the digital model is the same as the actual temperature value is: and obtaining a contact thermal resistance value when the temperature value of the internal device in the digital model is the same as the actual temperature value through iterative operation.
The beneficial effects of adopting the further technical scheme are as follows: the iterative operation process mainly sets the contact thermal resistance value between the cold conducting plug-in unit and the guide rail in a series of different simulation models (digital models), so that the simulation result of the temperature of the internal device is the same as the result of the actual model (actual chassis).
Further, the thermal contact resistance value in the digital model is the thermal contact resistance value between the cold guide insert and the cold guide strip of the guide rail in the digital model.
The beneficial effects of adopting the further technical scheme are as follows: by establishing a database, calculation can be performed in a simulation model (the heat quantity of a heat source and the arrangement of cold-conducting plug-ins are inconsistent), a maximum contact thermal resistance value which can meet the heat dissipation requirement of the heat source is found, and then a corresponding locking force is found in the database, so long as the actual locking force is greater than the maximum contact thermal resistance value, the heat dissipation requirement of a device can be met.
Further, the actual case is an air transporter radio equipment case, and the internal devices are chips or heating elements on a PCB (printed circuit board) inside the cold guide plug-in.
Further, the boundary conditions are the size, roughness and hardness of the actual chassis.
The beneficial effects of adopting the further technical scheme are as follows: the digital model is the same as other variables of the actual chassis, so that the simulation degree of the digital model is improved, and the accuracy is improved.
In addition, the invention also provides a device for calculating the thermal contact resistance of the chassis, which comprises: the intelligent temperature control system comprises a case, a torque wrench, a temperature acquisition instrument and a processor, wherein a cold guide plug-in unit and a guide rail are installed in the case, an internal device is installed in the cold guide plug-in unit, the input end of the temperature acquisition instrument is installed on the side wall of the cold guide plug-in unit, the input end of the temperature acquisition instrument is adjacent to the internal device, the torque wrench and the temperature acquisition instrument are connected with the processor, and the processor is used for establishing a digital model with the same heat source and the same boundary condition according to an actual case; the torque wrench is used for obtaining the actual pretightening force of the cold guide plug-in the actual chassis, which is fastened on the guide rail; the temperature acquisition instrument is used for acquiring an actual temperature value of an actual internal device; the processor is further used for adjusting the contact thermal resistance value in the digital model according to the actual temperature value to obtain the contact thermal resistance value when the temperature value of the internal device in the digital model is the same as the actual temperature value; the processor is further configured to establish a first database having a mapping relationship between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force.
The technical scheme of the invention has the beneficial effects that: based on the concept of digital twin, the temperature value of an internal device when the ATR chassis is actually used is used as a target value, a digital simulation model of the chassis is established, the digital simulation model is a digital model, other boundaries of the model are kept consistent with the actual situation, only the thermal contact resistance value of the plug-in unit and the guide rail is changed, and the thermal contact resistance value when the temperature simulation value of the device is the same as the target value is found by an iterative operation method and can be used as the thermal contact resistance value of the chassis under the condition. After a series of testing and simulation works under different use conditions are carried out, the obtained contact thermal resistance value is built into a database, so that the contact thermal resistance of the case can be measured, the subsequent thermal design work of the ATR case and derivative products thereof using different plug-ins can be guided, and the design precision and design efficiency are improved.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic flow chart of a method for calculating thermal contact resistance of a chassis according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a case thermal contact resistance calculating device according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a case thermal contact resistance calculating device according to an embodiment of the present invention.
Reference numerals illustrate: 1. an ATR chassis; 2. a guide rail; 3. a cold-conducting insert; 4. an internal device; 5. a torque wrench; 6. and a temperature acquisition instrument.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for calculating thermal contact resistance of a chassis, including:
and 4, establishing a first database with a mapping relation between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force.
The technical scheme of the invention has the beneficial effects that: based on the concept of digital twin, the temperature value of an internal device when the ATR chassis is actually used is used as a target value, a digital simulation model of the chassis is established, the digital simulation model is a digital model, other boundaries of the model are kept consistent with the actual situation, only the thermal contact resistance value of the plug-in unit and the guide rail is changed, and the thermal contact resistance value when the temperature simulation value of the device is the same as the target value is found by an iterative operation method and can be used as the thermal contact resistance value of the chassis under the condition. After a series of testing and simulation works under different use conditions are carried out, the obtained contact thermal resistance value is built into a database, so that the contact thermal resistance of the case can be measured, the subsequent thermal design work of the ATR case and derivative products thereof using different plug-ins can be guided, and the design precision and design efficiency are improved.
The thermal contact resistance value is the thermal contact resistance value of the contact surface of the cold guide substrate of the cold guide plug-in unit and the cold guide strip of the chassis. The simulation software is provided with interface contact thermal resistance setting, a series of different contact thermal resistance values can be set through parameterized calculation, and then calculation is carried out. The internal device is a heat source. Adjusting the contact resistance value in the digital model is to change the contact resistance value of the contact interface in the simulation model.
When the temperature value T1 of the internal device in the digital model=the actual temperature value T0, the thermal contact resistance value R set by the simulation model is the thermal contact resistance value under the locking force F (pre-tightening force) of the actual model.
The method is equivalent to putting the influencing factors into a black box, and only the measured temperature result and the simulation temperature result under one contact pressure are paired, so that the contact thermal resistance value set in the simulation process at the moment is the actual contact thermal resistance value under the contact pressure. This procedure corresponds to a mapping procedure. The physical model is fully utilized to build a simulation model with the same scale, the data of the sensor is utilized to calibrate, and the simulation process of multiple disciplines, multiple physical quantities and multiple states is integrated to reflect the state of the actual model.
The factors influencing the contact thermal resistance comprise contact pressure, contact surface roughness, contact area, material hardness and the like, and the factors of the contact surface roughness, the contact area, the material and the like are basically the same for the case, and only the contact pressure cannot be determined.
Further, the step 4 includes:
and 5, changing the actual pretightening force of the cold guide plug-in unit fastened on the guide rail in the actual chassis, repeating the steps 1 to 4, and establishing a second database with mapping relations between different pretightening forces and different contact thermal resistance values.
The beneficial effects of adopting the further technical scheme are as follows: testing under different pretightening forces is carried out to obtain a series of contact thermal resistance values, and a contact thermal resistance value database of the chassis is established; when the thermal design of the chassis using different plug-ins is developed subsequently, the thermal contact resistance data in the database can be adopted for simulation, so that on one hand, the precision of simulation calculation can be improved, and the efficiency of the thermal design can also be improved.
Further, the step 5 includes:
The beneficial effects of adopting the further technical scheme are as follows: when the temperature value of a device (an internal device) is wanted, the layout of a chassis plug-in (a cold conducting plug-in) can be directly changed in a digital twin model (a digital model), and the existing contact thermal resistance database is utilized for carrying out fine simulation design, so that the efficiency of thermal design can be improved, and the accuracy of a simulation result can be improved.
When the ATR case is actually used, the cold guide plug-in unit is usually screwed by an ordinary wrench, the screwing degree is not controlled, the screwing is too tight, and the plug-in unit is damaged; or the twisting moment is insufficient, so that the contact thermal resistance is large, and the device is overheated. By establishing a database, calculation can be performed in a simulation model (the heat quantity of a heat source and the arrangement of cold-conducting plug-ins are inconsistent), a maximum contact thermal resistance value which can meet the heat dissipation requirement of the heat source is found, and then a corresponding locking force is found in the database, so long as the actual locking force is greater than the maximum contact thermal resistance value, the heat dissipation requirement of a device can be met.
Further, step 1 is to build a 1:1 digital model of the same internal device and the same boundary condition according to the actual chassis through a simulation tool.
The beneficial effects of adopting the further technical scheme are as follows: the general software in the simulation field can be used as a simulation platform; the specific input is the environment temperature of the actual model, the size of the model and various physical parameters, and the calculation is performed by a solver of software. And a 1:1 digital model is built, so that the simulation degree of the digital model is improved, and the accuracy is improved.
Establishing a one-to-one corresponding digital model of the same internal device and the same boundary condition according to an actual chassis by using a simulation tool, wherein universal software in the simulation field can be used as a simulation platform; the specific input is the environment temperature of the actual model, the size of the model and various physical parameters; and (5) calculating by using a solver of software. When the model is built, consistency of model size, boundary conditions, physical parameters and the like needs to be ensured.
Further, the contact thermal resistance value obtained when the temperature value of the internal device in the digital model is the same as the actual temperature value is: and obtaining a contact thermal resistance value when the temperature value of the internal device in the digital model is the same as the actual temperature value through iterative operation.
The beneficial effects of adopting the further technical scheme are as follows: the iterative operation process mainly sets the contact thermal resistance value between the cold conducting plug-in unit and the guide rail in a series of different simulation models (digital models), so that the simulation result of the temperature of the internal device is the same as the result of the actual model (actual chassis).
Further, the thermal contact resistance value in the digital model is the thermal contact resistance value between the cold guide insert and the cold guide strip of the guide rail in the digital model.
The beneficial effects of adopting the further technical scheme are as follows: by establishing a database, calculation can be performed in a simulation model (the heat quantity of a heat source and the arrangement of cold-conducting plug-ins are inconsistent), a maximum contact thermal resistance value which can meet the heat dissipation requirement of the heat source is found, and then a corresponding locking force is found in the database, so long as the actual locking force is greater than the maximum contact thermal resistance value, the heat dissipation requirement of a device can be met.
Further, the actual case is an air transporter radio equipment case, and the internal devices are chips or heating elements on a PCB (printed circuit board) inside the cold guide plug-in.
The internal device is a chip or a heating module (heating element) on the PCB inside the cold-conducting insert, and is called as a heat source; the heat source is connected with the cold conducting substrate of the cold conducting plug-in unit, and the heat conducting pad is arranged in the middle of the heat source.
Further, the boundary conditions are the size, roughness and hardness of the actual chassis.
The beneficial effects of adopting the further technical scheme are as follows: the digital model is the same as other variables of the actual chassis, so that the simulation degree of the digital model is improved, and the accuracy is improved.
And keeping other boundaries of the model consistent with the actual conditions, and only changing the contact thermal resistance value of the plug-in unit and the guide rail.
The method for calculating the contact thermal resistance of the case of the embodiment of the invention is a solving method for the contact thermal resistance between the guide rail of the ATR case (Air Transport Radio, the case of the radio equipment of the air transporter) and the cold guide substrate of the plug-in unit, solves the existing difficult problem of measuring the contact thermal resistance of the ATR case, and improves the simulation calculation precision of the ATR case. Based on the concept of digital twin, the temperature value of an internal device when the ATR chassis is actually used is used as a target value, a digital simulation model (digital model) of the chassis is built, other boundaries of the model (digital model) are kept consistent with the actual situation, only the thermal contact resistance value of an insert (cold-conducting insert) and a guide rail is changed, and the thermal contact resistance value when the simulated value of the temperature of the device is the same as the target value is found by an iterative operation method, so that the thermal contact resistance value of the chassis under the condition can be used. After a series of testing and simulation works under different use conditions are carried out, the obtained contact thermal resistance value is built into a database, so that the subsequent thermal design work of the ATR chassis and derivative products thereof using different plug-ins can be guided.
Firstly, establishing a digital twin model (digital model) according to an ATR chassis physical model (actual chassis); secondly, in the aspect of an ATR chassis physical model, installing an insert (cold guide insert), and recording an installation moment F (pretightening force); powering up, and recording power consumption W and boundary conditions; in the aspect of a digital twin model, the simulation model establishes the same heat source and boundary conditions; thirdly, acquiring a target temperature T0 (temperature at the position of an internal device) in terms of an ATR chassis physical model; in the aspect of a digital twin model, setting a contact thermal resistance value R to obtain a temperature value T1 (the temperature at the position of an internal device in the digital model); fourthly, comparing the obtained temperature value T1 with the temperature value T0, adjusting a thermal contact resistance value R of a simulation model (digital model), performing iterative operation to enable the temperature value T1 to be close to the temperature value T0, and recording the thermal contact resistance value R at the moment as the thermal contact resistance value R between a chassis guide rail (guide rail) and an insert cold guide plate under the installation moment; fifthly, changing the mounting moment of the plug-in unit, repeating the steps 1-4 to obtain a series of contact thermal resistance values R, and establishing a database corresponding to the moment F and the contact thermal resistance R; and sixthly, when the temperature value of the device (internal device) is wanted, the layout of the case plug-in (cold guide plug-in) can be directly changed in a digital twin model (digital model), and the existing contact thermal resistance database is utilized for carrying out refined simulation design, so that the efficiency and the accuracy of a simulation result can be improved.
As shown in fig. 2 and 3, in addition, the present invention further provides a device for calculating thermal contact resistance of a chassis, including: the intelligent temperature control system comprises a case, a torque wrench, a temperature acquisition instrument and a processor, wherein a cold guide plug-in unit and a guide rail are installed in the case, an internal device is installed in the cold guide plug-in unit, the input end of the temperature acquisition instrument is installed on the side wall of the cold guide plug-in unit, the input end of the temperature acquisition instrument is adjacent to the internal device, the torque wrench and the temperature acquisition instrument are connected with the processor, and the processor is used for establishing a digital model with the same heat source and the same boundary condition according to an actual case; the torque wrench is used for obtaining the actual pretightening force of the cold guide plug-in the actual chassis, which is fastened on the guide rail; the temperature acquisition instrument is used for acquiring an actual temperature value of an actual internal device; the processor is further used for adjusting the contact thermal resistance value in the digital model according to the actual temperature value to obtain the contact thermal resistance value when the temperature value of the internal device in the digital model is the same as the actual temperature value; the processor is further configured to establish a first database having a mapping relationship between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force.
The technical scheme of the invention has the beneficial effects that: based on the concept of digital twin, the temperature value of an internal device when the ATR chassis is actually used is used as a target value, a digital simulation model of the chassis is established, the digital simulation model is a digital model, other boundaries of the model are kept consistent with the actual situation, only the thermal contact resistance value of the plug-in unit and the guide rail is changed, and the thermal contact resistance value when the temperature simulation value of the device is the same as the target value is found by an iterative operation method and can be used as the thermal contact resistance value of the chassis under the condition. After a series of testing and simulation works under different use conditions are carried out, the obtained contact thermal resistance value is built into a database, so that the contact thermal resistance of the case can be measured, the subsequent thermal design work of the ATR case and derivative products thereof using different plug-ins can be guided, and the design precision and design efficiency are improved.
After a series of testing and simulation works under different use conditions are carried out on the existing chassis (actual chassis), the obtained contact thermal resistance value is built into a database, so that the thermal design work of the following ATR chassis or similar products can be guided, and the design precision and design efficiency are improved.
The chassis contact thermal resistance calculation device includes: a general ATR machine case 1 (actual machine case), a guide rail 2, a digital simulation model, a torque wrench 5, a temperature acquisition instrument 6, and the like.
The general ATR chassis 1 is a combination of cold conduction and air cooling commonly used in airborne equipment and comprises a cold conduction plug-in unit 3 and other components; the digital simulation model (digital model) is a digital model established by using simulation software; the torque wrench 5 is a tool for locking the cold guide plug-in unit, and can record the locking force, so that the torque wrench is a main factor affecting the contact thermal resistance; the temperature acquisition instrument 6 is an instrument for acquiring the temperature of a heating device on the cold guide plug-in.
During testing, firstly, preparing an ATR chassis 1, fastening the cold guide insert 3 to a corresponding guide rail 2 by using a torque wrench 5, and recording corresponding pretightening force F; arranging temperature measuring points at and near the position of an internal device 4 on the cold guide insert 3, and recording the power consumption W of a heat source and a stable temperature value T0 as target values by using a temperature acquisition instrument 6; build 1 with simulation tool: 1, setting boundary conditions to be the same as actual experimental conditions, and iteratively calculating to obtain a thermal contact resistance value R which is the same as a target temperature T0 value by setting different thermal contact resistance values R between the guide rail 2 and the cold guide plug-in unit 3, wherein the value is used as the thermal contact resistance value R under the pretightening force F; continuing to conduct tests under different pretightening forces F to obtain a series of contact thermal resistance values R, and establishing a contact thermal resistance value database of the ATR chassis; when the thermal design of the ATR chassis using different plug-ins is developed subsequently, the thermal contact resistance data in the database can be adopted for simulation, so that on one hand, the precision of simulation calculation can be improved, and the efficiency of the thermal design can also be improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. The method for calculating the thermal contact resistance of the chassis is characterized by comprising the following steps of:
step 1, establishing a digital model of the same internal device and the same boundary condition according to an actual chassis;
step 2, acquiring actual pretightening force of a cold guide plug-in unit fastened on a guide rail in an actual chassis and an actual temperature value of an actual internal device;
step 3, adjusting the contact thermal resistance value in the digital model according to the actual temperature value to obtain the contact thermal resistance value when the temperature value of an internal device in the digital model is the same as the actual temperature value;
and 4, establishing a first database with a mapping relation between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force.
2. The method for calculating the thermal contact resistance of a chassis according to claim 1, wherein the step 4 comprises:
and 5, changing the actual pretightening force of the cold guide plug-in unit fastened on the guide rail in the actual chassis, repeating the steps 1 to 4, and establishing a second database with mapping relations between different pretightening forces and different contact thermal resistance values.
3. The method for calculating the thermal contact resistance of a chassis according to claim 2, wherein the step 5 comprises:
step 6, obtaining a required temperature value meeting the heat dissipation requirement of an actual internal device;
calculating the required temperature value through a digital model to obtain a required contact thermal resistance value;
inquiring a required pretightening force corresponding to the required contact thermal resistance value in the second database;
and installing the actual chassis according to the required pretightening force.
4. The method for calculating the thermal contact resistance of a chassis according to claim 1, wherein the step 1 is to build a 1:1 digital model of the same internal devices and the same boundary conditions according to an actual chassis by a simulation tool.
5. The method for calculating the thermal contact resistance of the chassis according to claim 1, wherein the thermal contact resistance obtained when the temperature value of the internal device in the digital model is the same as the actual temperature value is: and obtaining a contact thermal resistance value when the temperature value of the internal device in the digital model is the same as the actual temperature value through iterative operation.
6. The method for calculating thermal contact resistance of a chassis according to claim 1, wherein the thermal contact resistance value in the digital model is a thermal contact resistance value between a cold guide insert and a cold guide strip of a guide rail in the digital model.
7. The method for calculating the thermal contact resistance of a chassis according to claim 1, wherein the actual chassis is an air transporter radio equipment chassis, and the internal device is a chip or a heating element on a PCB inside the cold-conducting insert.
8. The method of claim 1, wherein the boundary conditions are the size, roughness, and hardness of the actual chassis.
9. A chassis thermal contact resistance calculation apparatus, comprising: the machine case is internally provided with a cold guide insert and a guide rail, the cold guide insert is internally provided with an internal device, the input end of the temperature acquisition instrument is arranged on the side wall of the cold guide insert, the input end of the temperature acquisition instrument is adjacent to the internal device, the moment spanner and the temperature acquisition instrument are connected with the processor,
the processor is used for establishing a digital model with the same heat source and the same boundary condition according to the actual chassis;
the torque wrench is used for obtaining the actual pretightening force of the cold guide plug-in the actual chassis, which is fastened on the guide rail;
the temperature acquisition instrument is used for acquiring an actual temperature value of an actual internal device;
the processor is further used for adjusting the contact thermal resistance value in the digital model according to the actual temperature value to obtain the contact thermal resistance value when the temperature value of the internal device in the digital model is the same as the actual temperature value;
the processor is further configured to establish a first database having a mapping relationship between the contact thermal resistance value corresponding to the actual temperature value and the actual pretightening force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211096770.1A CN116305715A (en) | 2022-09-08 | 2022-09-08 | Method and device for calculating thermal contact resistance of chassis |
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| CN202211096770.1A CN116305715A (en) | 2022-09-08 | 2022-09-08 | Method and device for calculating thermal contact resistance of chassis |
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| CN116305715A true CN116305715A (en) | 2023-06-23 |
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| CN202211096770.1A Pending CN116305715A (en) | 2022-09-08 | 2022-09-08 | Method and device for calculating thermal contact resistance of chassis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117094179A (en) * | 2023-10-18 | 2023-11-21 | 南通豪强电器设备有限公司 | Busbar heat dissipation analysis method and system for high-voltage switch cabinet |
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2022
- 2022-09-08 CN CN202211096770.1A patent/CN116305715A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117094179A (en) * | 2023-10-18 | 2023-11-21 | 南通豪强电器设备有限公司 | Busbar heat dissipation analysis method and system for high-voltage switch cabinet |
| CN117094179B (en) * | 2023-10-18 | 2023-12-26 | 南通豪强电器设备有限公司 | Busbar heat dissipation analysis method and system for high-voltage switch cabinet |
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