KR100423984B1 - Vibration test bed using linear motor - Google Patents

Abstract

The present invention relates to a vibration test shaking table using a linear motor for vibration testing a model structure and various machines, and more specifically, a support means, a linear guide fixed in parallel with the base by the support means and guiding a moving direction. In the vibration table for the vibration test of the model structure consisting of a base plate with a rail attached, a linear guide guided by the linear guide rail is attached to the lower portion to perform a horizontal linear movement, a linear motor, the Vibration motor is characterized in that a pair of two or more synchronized linear motor comprising a fixed end fixed to the base plate and a mobile end attached to the movable plate, a secondary facility when using a conventional hydraulic actuator Without the need for ball skew type motion transducers This eliminates the adverse effects of mechanical coupling between the moving plate and the actuator generated by the rotating motor, thereby eliminating the need to take into account the nonlinear characteristics due to temperature, friction, etc. that occur at the contact point in terms of performance and stability of the control system. It is possible to reduce the energy loss generated when converting to linear motion and to generate a force proportional to the current applied to the linear motor, so it is easy to control.

Description

Vibration Table for Vibration Test using Linear Motors {VIBRATION TEST BED USING LINEAR MOTOR}

The present invention relates to a shaking table for vibration test using a linear motor, and more specifically, the structure is relatively unnecessary because additional facilities, hydraulic generators and cooling equipment, etc. required when using a conventional hydraulic actuator using a linear motor are not required. The negative effects of the mechanical coupling between the moving plate and the actuator generated by the rotating motor using the simple and ball skew type motion transducer are eliminated. This is due to the temperature and friction generated in the contact area in terms of performance and stability of the control system. It is not necessary to consider the nonlinear characteristics, and it is possible to reduce the energy loss generated when converting the rotational motion into linear motion and generate a force proportional to the current applied to the linear motor, so it is easy to control the vibration test table using the linear motor. It is about.

As is well known, thousands of earthquakes are occurring every day around the world, and the damage caused by these earthquakes continues one after another. In particular, when a large earthquake occurs in an area such as a large city where the population is dense and the buildings are concentrated, the damage is enormous.

Therefore, studies on how the earthquake affects the structure, such as a study on the vibration effect on the structure during the earthquake, are actively being conducted.

The study on the vibration effect on the structure is largely based on the theoretical study that analyzes and analyzes the change generated in the structure when the vibration occurs by the equations such as the equation of motion and the vibration of the model structure artificially by using a separate vibration generator and control device. After generating, it is divided into experimental studies to predict the change occurring in the actual structure.

That is, the experimental study is to perform a vibration test by making a reduced model of the real structure to evaluate the vibration of the structure caused by the earthquake load, the vibration value measured by the law of similarity is converted into the vibration value of the real structure Through this, the stability and usability of the structure can be evaluated.

The shaking table used for the reduced model vibration experiment is a device for applying vibration to the reduced model similar to the actual structure by moving the moving plate by using the force generated by various actuators. Hydraulic cylinders are used as driving devices, or step motors or servomotors and ball screws are used.

However, the hydraulic cylinder as the driving device can generate a large force by supplying hydraulic pressure to the cylinder by using a hydraulic pump, but requires a hydraulic pump and various auxiliary facilities, the operating frequency is low, in particular oil Non-linearity such as compressibility and temperature increase due to continuous operation makes it difficult to design the control system and causes a problem of deteriorating safety and performance.

In addition, the servomotor or step motor converts the rotational motion generated from the motor into linear reciprocating motion by using the ball screw to move the moving table. Although there is an easy advantage, there is a problem that the frictional resistance, thermal expansion, etc. of the bullscrew to transfer the rotational force of the motor in a linear motion of the moving mass.

The present invention has been made in order to solve the above problems, the object of the present invention is a relatively structure that does not require additional facilities, hydraulic generators and cooling equipment piping when using a conventional hydraulic actuator using a linear motor. Has eliminated the adverse effects caused by mechanical coupling between the moving plate and the actuator in the rotary motor using a ball skew type motion transducer. It is not necessary to consider the non-linear characteristics due to vibration, and it is possible to reduce the energy loss generated when converting rotational motion into linear motion and to generate a force proportional to the current applied to the linear motor. It is to provide a shaking table.

In order to achieve the above object, the present invention provides a support means, a base plate fixed to the base by the support means and the linear guide rail attached to the guide guides the direction of movement, the linear guide guided by the linear guide rail In the vibration table for the vibration test of the model structure consisting of a linear motor and a moving plate which is attached to the lower portion to perform a horizontal linear motion,

The linear motor is characterized in that a bundle (one set) of two or more synchronized linear motors comprising a fixed end attached to the base plate and a fixed end is attached to the moving plate.

1 is a system configuration diagram schematically showing the overall operating relationship including the vibration table for testing vibration using the linear motor of the present invention,

2 is a perspective view illustrating a known linear motor in the present invention;

3 is a perspective view of a one-way vibration table as an embodiment of the present invention;

4 is a side view of the one-way shaking table of FIG. 3;

5 is a perspective view of a bidirectional shaking table as another embodiment of the present invention;

6 is a side view of the bidirectional shaking table of FIG.

※ Explanation of code about main part of drawing ※

1: support means 2: foundation (bottom, ground, etc.)

3: linear guide 4: linear guide rail

5: Base Plate 6: Moving Plate

6a: middle moving plate 6b: upper moving plate

7: linear motor 7a: fixed end

7b: mobile stage 10: shaking table

11: signal generator 12: motor controller

13: power amplifier 14: damper

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the present invention.

1 is a system configuration diagram schematically showing the overall operating relationship including the vibration test shake table using the linear motor of the present invention.

As shown, the system using the apparatus of the present invention first generates a signal by a signal generator 11 when the displacement, velocity, or acceleration waveform to which the moving plate will move is determined, and the signal is generated by a motion controller 12. Is transmitted to the power amplifier 13 and the signal amplified by the power amplifier is applied to the linear motor 7, which is an actuator of the vibration table 10, and the linear motor 7 A force is generated in proportion to the applied voltage or current and the moving plate moves by this force.

2 is a perspective view illustrating a known linear motor in the present invention. As shown, the linear motor 7 in the present invention is composed of an iron core (Iron Core, 72) and a fixed end (7a) that is a moving end (7b) to which the permanent magnet (71) is attached. Alternatively, it may be composed of a fixed end to which the permanent magnet is attached and a moving end to which the coil is wound.

That is, as is well known, a current or voltage is applied to the coil 73 to generate a force according to Fleming's law so that the mobile terminal 7b performs a linear motion.

In addition, in the present invention, the two linear motors 7 are synchronized to prevent rotational movement of the moving plate. The displacement, velocity or acceleration signal of the moving plate is fed back and compared with the input waveform, and then the controller output is converted so that the moving plate can describe the input waveform.

Figure 3 is a perspective view of one-way shaking table as an embodiment of the present invention, Figure 4 is a side view of the one-way shaking table of Figure 3, Figure 5 is a perspective view of a two-way shaking table as another embodiment of the present invention, Figure 6 5 is a side view of the two-way shaking table.

As shown, the present invention is a base plate attached to the support means (1), a linear guide rail (4) fixed in parallel with the base portion 2 by the support means (1) to guide the direction of movement ( 5), the vibration test of the model structure comprising a linear guide (3) guided by the linear guide rail (4) attached to the lower portion and a moving plate (6), a linear motor (7) for horizontal linear motion In the shaking table 10 for,

The linear motor 7 includes two or more synchronized linear motors including a fixed end 7a attached to the base plate 5 and a fixed end 7b attached to the movable plate 6. It consists of one bundle (one set).

In addition, in the present invention, the movable plate 6 having the linear guide 3 attached to the lower portion in order to allow the shake table 10 to vibrate in two or more directions may have one or more linear guide rails 4 attached to the upper portion thereof. The intermediate moving plate 6a and the upper moving plate 6b having no linear guide rails 4 attached thereto are stacked on top of each other, and the bundle number of the vibration motor 7 in which the two or more are bundled in one set is fixed. The end 7a and the moving end 7b each consist of two or more attached between the stacked base plate 5, the intermediate moving plate 6a, and the upper moving plate 6b.

The shaking table 10 has a moving plate 6 and a linear motor 7 which is an actuator for driving the same, a linear guide 3 for supporting a reduction model and indicating straightness, and a stopper or damper 14 as an impact buffer. It consists of a base plate (5) that can be fastened to the ground, the bottom or the additional mass, which is the base (2) and consists of a support means (1) for easy fastening and adjusting the height.

The support means 1 may have any structure capable of horizontally supporting the base plate 5 and are fastened to the base plate 5 via a fixing member such as a bolt.

In addition, the present invention uses the linear guide (3) and the linear guide rail (4) so that the moving plate 6 can move smoothly and withstand the load of the reduced model, and also when the displacement is generated by using a stopper or damper (14) The plate can be restrained.

The reduced structure is supported by the linear guide 3 and the linear guide rail 4, and since the linear guide 3 and the linear guide rail 4 exhibit almost no friction, the reduced structure can be applied even at a small force. It is designed to move.

The fixed end 7a of the linear motor 7 is fixed to the base plate 5 and the moving end 7b is attached to the moving plate 6 to generate vibrations according to the signal applied by the power amplifier 13. Let's do it. The generated vibration appears as the movement of the moving plate and acts to induce vibration in the reduction model.

The bidirectional shaking table consists of a base plate 5, an intermediate moving plate (X direction, Y-direction) 6a, and an upper moving plate 6b, and the base plate 5 and the intermediate moving plate 6a and the upper movement. The plates 6b are connected to the drive system composed of the linear guide 3 and the linear motor 7 in the same way as the one direction. Therefore, it acts to induce bidirectional (X, Y) vibration in the scale model to be tested. That is, since the shaking table using the linear motor is easy to expand, it is easy to configure a two-way shaking table. By stacking the intermediate moving plates 6a, the intermediate plate 6a can be configured in three or more directions as well as in both directions.

As described above, the present invention does not require additional facilities, such as a hydraulic generator and a cooling device, when using a conventional hydraulic actuator using a linear motor, so the structure is relatively simple and a ball skew type motion transducer is required. The negative effects of mechanical coupling between the moving plate and the actuator generated in the rotating motor are eliminated, so that it is not necessary to consider the nonlinear characteristics due to temperature and friction generated in the contact area in terms of performance and stability of the control system. It can reduce the energy loss generated when converting to linear motion and generates a force proportional to the current applied to the linear motor, so it is easy to control.

Furthermore, the present invention is simple in structure, so that the two shaking tables can be combined in series to easily constitute a bidirectional (X, Y) shaking table, and the vibration test of a reduced structure depicting a large structure such as a high-rise building can be performed. As a result, it is possible to evaluate the safety of the structure and the usability of people's residence, and can apply to various fields such as seismic performance test, dynamic characteristics test, vibration fatigue test of various precision equipment, home appliances, etc.

Claims (2)

A base plate (5) to which the support means (1), a linear guide rail (4) fixed in parallel with the base (2) by the support means (1), and guiding a moving direction, are attached and coupled; In the shaking table 10 for the vibration test of the model structure comprising a linear guide (3) guided by the 4) attached to the lower portion and a moving plate (6) and a linear motor (7) for horizontal linear motion , The linear motor 7 includes two or more synchronized linear motors including a fixed end 7a attached to the base plate 5 and a fixed end 7b attached to the movable plate 6. Vibration table for vibration test using a linear motor, characterized in that one bundle (1 set). The movable plate 6 having the linear guide 3 attached to the lower portion in order to cause the shaking table 10 to be vibrated in two or more directions has a linear guide rail 4 attached to the upper portion thereof. The intermediate moving plate 6a and the upper moving plate 6b to which the linear guide rail 4 is not attached are laminated on the upper side, The number of bundles of the linear motor (7) in which the two or more are bundled into one set is the base plate (5), the intermediate moving plate (6a), the upper moving plate (7a) and the fixed end (7a) and the moving end (7b), respectively. 6b) Vibration table for vibration test using a linear motor, characterized in that two or more attached between.