CN104965408A - Fan blade vibration detection and control device - Google Patents

Abstract

The invention provides a fan blade vibration detection and control device, which consists of a MEMS sensor (1), a controller (2), a magnetorheological fluid (3), a two-way liquid pump (4), an electromagnetic coil (5), a bow-shaped metal tube (6). The invention changes the mass distribution of the fan blades by controlling the mass of the magnetorheological fluid flowing into the inner cavity of the fan blades, thereby changing the frequency of the fan blades, balancing the fan blades, and achieving the effect of reducing vibration. By adopting the active control system for fan blade vibration of the present invention, blade chattering can be effectively avoided and failure of the fan can be avoided.

Description

A fan blade vibration detection and control device

technical field

The invention belongs to the technical field of automatic identification, and in particular relates to a vibration detection and control device for fan blades.

Background technique

With the increasingly prominent environmental and energy issues, wind energy, as a renewable, non-polluting green energy, has attracted more and more attention; wind power generation is one of the main forms of utilizing wind energy. The fan blade is the core component of the fan and an important part of the energy conversion of the fan; during the rotation of the blade, when the blade turns from the top to the bottom, the force changes and changes alternately, as well as the instability of the wind, which will cause Vibration of the fan; the severe vibration of the fan blade will lead to cracks. If the vibration is not effectively controlled, it may cause the fracture and failure of the entire blade, resulting in huge economic losses; therefore, the vibration control of the blade is hindering the further development of wind power technology. One of the major obstacles to development.

The invention changes the mass distribution of the fan blades by controlling the mass of the magnetorheological fluid flowing into the inner cavity of the fan blades, thereby changing the frequency of the fan blades, balancing the fan blades, and achieving the effect of reducing vibration. By adopting the active control system for fan blade vibration of the present invention, the blade vibration is effectively avoided, and the failure of the fan is avoided.

Contents of the invention

The invention provides a fan blade vibration detection and control device, which consists of a MEMS sensor (1), a controller (2), a magnetorheological fluid (3), a two-way liquid pump (4), an electromagnetic coil (5), a bow-shaped metal tube (6). The present invention controls the mass of the magnetorheological fluid flowing into the bow-shaped metal pipe through a two-way liquid pump, changes the mass distribution of the fan blades, thereby changes the frequency of the fan blades, balances the fan blades, and achieves the effect of reducing vibration; adopts the method of the present invention Fan blade vibration control device can effectively avoid blade flutter and avoid fan failure.

The controller receives signals from the MEMS sensor, controls the two-way liquid pump to deliver the magneto-rheological fluid into the arcuate metal tube, and controls the activation of the electromagnetic coil.

The MEMS sensor is placed inside the fan blade, connected to the controller, measures the acceleration and vibration frequency of the fan blade, and transmits the measured data to the controller in real time.

The magnetorheological fluid is placed in the inner cavity of the fan blade and connected with a bidirectional liquid pump, and the quality of the magnetorheological fluid injected into the bow-shaped metal pipe is changed by controlling the bidirectional liquid pump.

The electromagnetic coil is wound outside the bow-shaped metal tube and connected to the controller to control the solid-liquid state conversion of the magnetorheological fluid.

The two-way liquid pump is placed inside the blade of the fan, and is respectively connected to the controller, the magnetorheological fluid and the bow-shaped metal pipe to control the quality of the magnetorheological fluid entering and exiting the bow-shaped metal pipe.

The bow-shaped metal tube is placed inside the fan blade, connected with a bidirectional liquid pump, and stores magnetorheological fluid.

The magnetorheological fluid can also be replaced with an electric current fluid.

The device is that the controller receives the acceleration and vibration amplitude signals of the MEMS sensor. When the vibration amplitude signal is close to the natural frequency of the fan, the two-way liquid pump is controlled by the PID algorithm to change the quality of the magnetorheological fluid injected into the bow-shaped metal pipe, and at the same time change the The mass distribution of the fan blades is improved, so that the vibration frequency of the fan blades can be changed.

The beneficial effects of the present invention include the following points.

1. Fan blades can effectively avoid blade flutter and fan failure in complex environments.

2. Simple structure, convenient operation and precise control.

3. Low cost, high cost performance.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the work flow of a fan blade vibration detection and control device provided by the present invention.

Detailed ways

As shown in Figure 1, the present invention provides a fan blade vibration detection and control device, which consists of a MEMS sensor (1), a controller (2), a magnetorheological fluid (3), a bidirectional liquid pump (4), an electromagnetic coil ( 5) Composed of bow-shaped metal pipes (6). The fan blade vibration control device of the present invention can effectively avoid blade vibration and avoid failure of the fan.

A fan blade vibration detection and control device of the present invention is that the controller (2) receives the acceleration and vibration amplitude signals of the MEMS sensor (1), and when the vibration amplitude signal is close to the natural frequency of the fan, the two-way liquid pump (4) is controlled by the PID algorithm. , changing the mass of the magnetorheological fluid (3) injected into the bow-shaped metal tube (6), and changing the mass distribution of the fan blades, thereby changing the vibration frequency of the fan blades.

When the blades of the fan rotate, the controller (2) receives the acceleration and vibration amplitude signals from the MEMS sensor (1), and the controller (2) controls the two-way liquid pump (4) according to the rotation speed and amplitude of the blades to change It injects the liquid quality of the magnetorheological fluid (3) into the bow-shaped metal tube (6), and then the controller (2) sends a control signal to the electromagnetic coil (5), so that the magnetorheological fluid (3) changes from liquid to solid , at this time, the controller (2) continues to receive the signal from the MEMS sensor (1) to calculate the frequency of the blade. If it is still close to the natural frequency, the controller (2) will release the control signal to the electromagnetic coil (5), so that the magnetorheological fluid ( 3) Change from solid state to liquid state, and control the two-way liquid pump (4), continue to change the liquid quality of the magnetorheological fluid (3) injected into the arcuate metal tube (6), and then change the frequency of the blade again until the blade frequency deviate from its natural frequency.

To sum up, the device for detecting and controlling the vibration of fan blades provided by the present invention is simple and feasible.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it still Modifications or equivalent replacements can be made to the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims (3)

1. A fan blade vibration detection and control device is characterized in that: the fan blade vibration detection and control device consists of a MEMS sensor (1), a controller (2), a magnetorheological fluid (3), a bidirectional liquid Composed of pump (4), electromagnetic coil (5), and bow-shaped metal tube (6); the controller receives signals from MEMS sensors, controls the two-way liquid pump to transmit magnetorheological fluid into the bow-shaped metal tube, and controls the electromagnetic coil start; the MEMS sensor is placed inside the fan blade, connected to the controller, measures the acceleration and vibration frequency of the fan blade, and transmits the measured data to the controller in real time; the magnetorheological fluid is placed on the fan blade The inner cavity is connected with the two-way liquid pump, and the quality of the magnetorheological fluid injected into the bow-shaped metal tube is changed by controlling the two-way liquid pump; the electromagnetic coil is wound outside the bow-shaped metal tube, and is connected to the controller at the same time to control the magnetic flow The solid-liquid form of variable fluid is converted; the two-way liquid pump is placed inside the fan blade and connected to the controller, magnetorheological fluid and bow-shaped metal pipe respectively to control the quality of magnetorheological fluid entering and leaving the bow-shaped metal pipe; The bow-shaped metal tubes are placed inside the fan blades and connected to the two-way liquid pump to store the magnetorheological fluid. 2. The vibration detection and control device for fan blades according to claim 1, characterized in that: the magnetorheological fluid can also be replaced with a current fluid. 3. A kind of fan blade vibration detection and control device according to claim 1, characterized in that: the device is that the controller receives the acceleration and the vibration amplitude signal of the MEMS sensor, and when the vibration amplitude signal is close to the natural frequency of the fan, The two-way liquid pump is controlled by the PID algorithm, the mass of the magneto-rheological fluid injected into the bow-shaped metal pipe is changed, and the mass distribution of the fan blades is changed at the same time, so that the vibration frequency of the fan blades can be changed.