A vibration isolation test platform combining particle damping and electromagnetic suspension and a working method thereof

Abstract

The present application relates to a kind of particle damping and electromagnetic suspension mixed vibration isolation test platform and its working method.The platform is divided into platform upper part and platform lower part two parts, platform upper part includes upper support frame, electromagnet, suspension vibration sensor, through suspension vibration sensor monitoring platform upper part's suspension vibration situation and signal acquisition, signal transmission to suspension vibration controller and drive electromagnet to generate response electromagnetic force for active vibration reduction;To achieve suspension vibration isolation;Platform lower part includes lower support frame, hollow groove, damping particle, vibration sensor, through vibration sensor monitoring platform lower part's suspension vibration situation, and through vibration controller calculation stiffness and damping that should be reached, control the quantity of damping particle to change the stiffness damping of platform lower part, realize particle damping vibration reduction.Compared with prior art, the present application has the advantages of realizing full-band vibration energy attenuation and vibration isolation, good vibration isolation effect, stability, high integration, high flexibility, strong practicality and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration isolation, in particular to a vibration isolation test platform mixed with particle damping and electromagnetic suspension and a working method thereof. BACKGROUND

[0002] At present, due to the vibration of high-power electrical equipment, the research and development of damping equipment is very important for vibration reduction, noise reduction and vibration energy absorption. At present, the main method is to install a damping patch on the equipment mounting platform according to the vibration estimation result, and to absorb the vibration energy by increasing the damping of the platform.

[0003] For example, the invention with publication number CN110206846A discloses a double-frequency damping vibration isolation platform, which stacks and combines two vibration isolation materials with different natural frequency ranges, thereby reducing the natural frequency of the damping vibration isolation platform, increasing the stability of the damping vibration isolation platform, and enhancing the vibration isolation effect of the damping vibration isolation platform.

[0004] However, this method cannot cover the full-band vibration energy, and cannot adaptively adjust according to the change of vibration amplitude and frequency, so it may even amplify the vibration at certain vibration frequencies.

[0005] Electromagnetic suspension technology is a kind of active suspension vibration control technology, which is often used for suspension vibration control of maglev trains during operation. The electromagnetic force is used to realize the non-contact coupling between the electromagnet and the lower mechanical structure, which has the characteristics of good damping effect, active adjustment of stiffness and damping, and suitability for complex working environment.

[0006] For example, the invention with publication number CN112594315A discloses a magnetic suspension vibration isolator, which is arranged between the stator and the mover of a magnetic suspension vibration isolation system. The electromagnetic permanent magnet module of the magnetic suspension vibration isolator controls the suspension stability and suppresses vibration through electromagnetic force. The size of the electromagnetic force can be adjusted according to the vibration condition, so that vibration control with different frequencies and fast response can be realized. Since the electromagnetic permanent magnet module provides the main bearing force through the permanent magnetic force, the loss of electromagnetic force can be reduced, thereby reducing the energy consumption of the magnetic suspension vibration isolator.

[0007] However, considering that the electromagnetic suspension vibration control technology has a particularly obvious effect on low-frequency vibration isolation, the isolation effect of high-frequency vibration is relatively weak. SUMMARY

[0008] The present application is to overcome the defects of the prior art and provide a vibration isolation test platform mixed with particle damping and electromagnetic suspension and a working method thereof.

[0009] The object of the present application can be realized by the following technical solutions.

[0010] According to one aspect of the present application, a vibration isolation test platform mixed with electromagnetic suspension and particle damping is provided, which adopts the upper support frame for suspension vibration isolation and the lower support frame for mixed damping of particle damping and vibration damping in a multi-stage vibration energy reduction mode.

[0011] The platform is divided into an upper part and a lower part, the upper part is arranged above the lower part, and the two parts are not connected;

[0012] The upper part includes an upper support frame 2, an electromagnet 1, and a suspension vibration sensor 5 for suspension vibration isolation.

[0013] The upper part is supported by the upper support frame 2, the electromagnet 1 is symmetrically arranged on both sides of the upper part, and the suspension vibration sensor 5 is symmetrically arranged on both sides of the upper part.

[0014] The lower part includes a lower support frame 6, a hollow groove 4, damping particles 3, and a vibration sensor 7 for particle damping and vibration reduction.

[0015] The lower part is supported by the lower support frame 6, the vibration sensor 7 is symmetrically arranged on both sides of the lower part, the hollow groove 4 is arranged in the lower part, and the damping particles 3 are filled in the groove.

[0016] As a preferred technical solution, the electromagnet 1 is fixed on the upper part by bolts, and every two are connected in series as a group arranged transversely.

[0017] As a preferred technical solution, the damping particles 3 are detachably installed in the hollow groove.

[0018] As a preferred technical solution, the damping particles 3 are in the shape of a sphere or a tetrahedron to ensure good flowability of the damping particles (3) in the hollow groove inside the lower support frame.

[0019] As a preferred technical solution, the suspension vibration sensor 5 is connected to a suspension vibration controller, and the vibration sensor 7 is connected to a vibration controller.

[0020] According to another aspect of the present application, a working method of a vibration isolation test platform mixed with electromagnetic suspension and particle damping is provided, which is applied to the vibration isolation test platform mixed with electromagnetic suspension and particle damping as described above to perform multi-stage vibration isolation when subjected to vibration excitation, and the method steps include:

[0021] S1, monitoring the suspension vibration of the upper part of the platform by the suspension vibration sensor, collecting signals, and transmitting the signals to the suspension vibration controller;

[0022] S2, calculating control current by the signal transmitted in S1 through the suspension vibration controller;

[0023] S3, generating response electromagnetic force by the electromagnet driven by the control current, for active vibration reduction;

[0024] S4, after the vibration reduction of the upper part of the platform, monitoring the suspension vibration of the lower part of the platform through the vibration sensor, and collecting the monitoring signal;

[0025] S5, inputting the collected monitoring signal to the vibration controller to calculate the stiffness and damping to be reached;

[0026] S6, controlling the number of damping particles by the calculated stiffness and damping, and outputting and recycling the damping particles; thereby changing the stiffness and damping of the lower part of the platform to realize vibration reduction.

[0027] As a preferred technical solution, the signal in S1 includes 4 suspension gap signals and 2 acceleration signals; the 4 suspension gap signals are mutually redundant, and the 2 acceleration signals are mutually redundant.

[0028] As a preferred technical solution, when calculating the control current in S2, an acceleration loop is added in the algorithm:

[0029]

[0030] Wherein, k a1 , k a2 is the acceleration loop gain, a is the vertical motion acceleration of the upper rack, is the acceleration signal obtained by twice differentiation of the gap.

[0031] As a preferred technical solution, the specific process of controlling the number of damping particles by the calculated stiffness and damping in S5 and S6 is:

[0032] According to the maximum difference between the vibration displacement of the lower support frame and the target vibration displacement, and the physical properties of the filled material, the number of required damping particles is calculated, and the number of damping particles is increased or decreased.

[0033] Further, the physical properties of the filled material include the elastic coefficient, the damping coefficient and the related size.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] 1. The vibration isolation test platform in the application is divided into an upper platform and a lower platform, the upper platform comprises an upper support frame, an electromagnet and a levitation vibration sensor, and is used for levitation vibration isolation; the lower platform comprises a lower support frame, a hollow groove, damping particles and a vibration sensor, and is used for particle damping vibration reduction; a multi-section vibration reduction technology is adopted, when the upper support frame is excited, first, the electromagnetic levitation vibration isolation technology is used for vibration isolation, if the effect of complete isolation is not achieved, the particle damping technology is further used for vibration energy attenuation in the lower support frame; similarly, when the lower support frame is excited, first, the particle damping technology is used for vibration energy attenuation, and then the electromagnetic levitation vibration isolation technology is used for vibration isolation, so that the optimal vibration isolation effect is achieved.

[0036] 2. The advantages of the electromagnetic levitation vibration isolation technology and the particle damping vibration energy attenuation technology are combined in the application, multi-section vibration isolation is carried out when vibration excitation is received, vibration energy attenuation and vibration isolation in the full frequency band can be achieved, and the vibration isolation effect is good; four levitation gap signals and two vibration signals are adopted, the four levitation gap signals are redundant with each other, the two acceleration signals are redundant with each other, and the reliability of the system is improved.

[0037] 3. The material and radius of the damping particles are replaced according to the actual vibration condition in the application, the shape comprises a sphere or a tetrahedron, so that the damping particles have good fluidity in the hollow filling groove in the lower support frame, the particle damping vibration isolation technology is effectively improved, compared with the original passive vibration reduction structure, the particle damping vibration reduction technology proposed in the application can adjust the stiffness and damping of the support frame in real time according to the actual vibration condition, and the vibration isolation performance of the support frame is further improved.

[0038] 4. The number of damping particles required is calculated according to the maximum difference between the vibration displacement of the lower support frame and the target vibration displacement and the physical properties of the filled material, and the number of damping particles is increased or decreased, so that the stiffness and damping of the lower part of the platform are changed, vibration reduction is achieved, the working mode of the previous traditional electromagnetic levitation active control and the addition of damping particles do not need to be changed, only improvement is needed on the existing mode, integration redundancy is realized in consideration of space installation and reliability, effective statistics are carried out in the number control of damping particles, and the application has the characteristics of high integration, strong flexibility, convenient loading and unloading, and strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a structure schematic diagram of a particle damping and electromagnetic levitation mixed vibration isolation test platform in the application;

[0040] Figure 2 It is a structure schematic diagram of a particle damping and electromagnetic levitation mixed vibration isolation test platform in the application;

[0041] Figure 3Flow chart of the damping particle statistical-output-recovery process in the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present application.

[0043] EMBODIMENT

[0044] Since the frequency distribution of the equipment vibration has uncertainty, the vibration components in different frequency bands need to be considered in combination with the actual situation to evaluate the vibration isolation effect.

[0045] In the present embodiment, considering the excellent vibration isolation performance of the electromagnetic suspension vibration control in the low frequency band, and in comparison, the relatively weak vibration isolation effect in the high frequency band, the active control type particle damping vibration reduction technology is introduced to further combine the vibration attenuation effect of the lower support frame to actively adjust the stiffness and damping of the support frame, so that the designed double-layer vibration isolation platform can isolate and attenuate the vibration components in different frequency bands in the upper and lower layers, achieving the effect of multi-stage vibration attenuation and isolation.

[0046] In the present embodiment, a vibration isolation test platform combining particle damping and electromagnetic suspension is applied. In the experimental platform, when the upper support frame is excited by vibration, the upper support frame can achieve stable suspension state through the suspension control system, and the vibration energy can be reduced through the magnetic coupling field. Due to the magnetic coupling effect, the vibration is not completely attenuated when transmitted to the lower support frame, so further vibration reduction can be performed through particle damping. At this time, the energy transmitted downward by the lower support frame can be guaranteed to be the lowest, so as to guarantee that the vibration and noise interference generated by the platform and the electrical and mechanical equipment to the surrounding equipment is the lowest.

[0047] In the present embodiment, as shown in Figure 1 , the platform is divided into an upper part and a lower part, the upper part is arranged above the lower part, and the two parts are not connected;

[0048] In the present embodiment, when not working, the upper support frame is lowered on the lower support frame, and when working normally, the upper support frame and the lower support frame are suspended with a certain gap through magnetic force coupling, and a certain limit between the upper and lower parts can be considered to constrain the relative position when working normally.

[0049] In the embodiment, the upper part of the platform comprises the upper support frame 2, the electromagnet 1, and the levitation vibration sensor 5 for levitation vibration isolation; the upper part of the platform is supported by the upper support frame 2, the electromagnet 1 is symmetrically arranged on both sides of the upper part of the platform, and the levitation vibration sensor 5 is symmetrically arranged on both sides of the upper part of the platform.

[0050] In the embodiment, the lower part of the platform comprises the lower support frame 6, the hollow groove 4, the damping particles 3, and the vibration sensor 7 for particle damping vibration reduction; the lower part of the platform is supported by the lower support frame 6, the vibration sensor 7 is symmetrically arranged on both sides of the lower part of the platform, the hollow groove 4 is arranged on the lower part of the platform, and the damping particles 3 are filled in the groove.

[0051] In the embodiment, the electromagnet 2 is fixed on the upper part of the platform by bolts, every two electromagnets are connected in series to form a group to constitute a levitation point, and a levitation vibration sensor is arranged at one end of every two electromagnets to measure the levitation and vibration of the upper support frame in real time. In addition, the levitation vibration sensor synchronously measures 4-way gap signals and 2-way vibration signals, which are transmitted to the magnetic force controller via a serial port for current control calculation.

[0052] In the embodiment, the material and radius of the damping particles 3 are replaced according to the actual vibration condition, and the shape of the damping particles 3 includes a sphere or a tetrahedron to ensure that the damping particles 3 have good fluidity in the hollow filling groove in the lower support frame.

[0053] In the embodiment, the levitation vibration sensor 5 is connected to the levitation vibration controller, the vibration sensor 7 is connected to the vibration controller, and a power switch is arranged in the levitation vibration controller to generate an electromagnetic force to achieve active vibration reduction.

[0054] In the embodiment, the electromechanical equipment that needs to be damped and noise-reduced is installed on the upper part of the platform, and a particle damping and electromagnetic levitation mixed vibration isolation test platform is applied to work. When subjected to vibration excitation, multi-stage vibration isolation is performed, and the method steps include:

[0055] S1, monitor the levitation and vibration of the upper part of the platform through the levitation vibration sensor, collect signals, and send the signals to the levitation vibration controller through a serial port; the levitation and vibration of the upper support frame and the equipment above are controlled by the levitation vibration control system, and the vibration is controlled considering the vibration of the upper support frame and the equipment above, and the upper support frame and the lower support frame are realized without mechanical contact in a non-contact manner.

[0056] In the embodiment, the signal includes 4-way levitation gap signals and 2-way acceleration signals; when the levitation sensor collects, analog electric signals capable of representing 4-way gap signals and 2-way acceleration signals are adopted to the controller, the 4-way gap signals are mutually redundant, and the 2-way acceleration signals are mutually redundant. When a channel of the gap signal or the acceleration signal fails, the system can continue to work.

[0057] S2, the levitation vibration controller calculates the control current through the signal transmitted in S1;

[0058] In the embodiment, when the electromechanical equipment arranged on the upper support frame is used as a vibration excitation source, the vibration isolation platform is normally started. The levitation vibration sensor measures the levitation gap between the upper and lower support frames and the vibration of the upper support frame, and sends it to the controller through the serial port for control current calculation, as shown in Figure 2 The basic current calculation formula in the PID (proportion integration differentiation) control algorithm is:

[0059]

[0060] Wherein, k p ,k i ,k d are the coupling gains of different links, s and s0 are the actual levitation gap and the expected levitation gap respectively.

[0061] In the embodiment, in order to effectively control the vibration, the acceleration loop is added in the algorithm when calculating the control current:

[0062]

[0063] Wherein, k a1 , k a2 are the acceleration loop gains, a is the vertical motion acceleration of the upper rack, is the acceleration signal obtained by twice differentiation of the gap.

[0064] S3, the electromagnetic iron is driven by the control current to generate a response electromagnetic force for active vibration reduction;

[0065] S4, after the vibration of the upper part of the platform is reduced, the levitation vibration of the lower part of the platform is monitored through the vibration sensor, and the monitoring signal is collected;

[0066] In the embodiment, when the vibration isolation performance meets the requirements, the lower support frame particle damping system does not work. When the vibration isolation performance does not meet the requirements, on the one hand, the upper support frame suspension vibration control system further controls the vibration, and on the other hand, the lower support frame particle damping system works in combination with the vibration state, outputs or recovers a corresponding number of damping particles, changes the stiffness of the lower support frame, and improves the vibration isolation performance of the system in the full frequency range of 10-10 kHz in combination with the above two methods.

[0067] In the embodiment, when the device arranged on the upper support frame transmits vibration downward as a vibration excitation source, after the contactless vibration isolation by the electromagnetic suspension control system, part of the high-frequency vibration components are still transmitted to the lower support frame through the coupling electromagnetic force. The hollow frame in the lower support frame can further attenuate the vibration energy by filling the particle damping.

[0068] S5, input the collected monitoring signals to a vibration controller to calculate the stiffness and damping to be achieved;

[0069] S6, control the number of damping particles by the calculated stiffness and damping, output and recover the damping particles, so as to realize the vibration reduction of the stiffness and damping of the lower part of the platform.

[0070] In the embodiment, the number of required damping particles is calculated according to the maximum difference between the vibration displacement of the lower support frame and the target vibration displacement and the physical properties of the filled material, and the number of damping particles is increased or decreased. The physical properties of the filled material include the elastic coefficient, the damping coefficient and the related size.

[0071] In the embodiment, the lower support frame is provided with a particle damping output and recovery channel, and the number of damping particles is matched with the required stiffness and damping of the lower support frame to output and recover the damping particles, as shown in Figure 3 When the vibration reduction effect meets the requirements, the channel is closed, and when the vibration reduction effect does not meet the requirements, the channel is opened according to the calculation and statistical results of the damping particles to increase or decrease the damping particles.

[0072] In summary, the method can better control the full-frequency vibration compared with the prior art, and can actively adjust in combination with a certain characteristic frequency to achieve more fine active control.

[0073] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A working method for a vibration isolation test platform that combines particle damping and electromagnetic levitation, applied to a vibration isolation test platform that combines particle damping and electromagnetic levitation, characterized in that, The vibration isolation test platform is divided into two parts: an upper platform and a lower platform. The upper platform is suspended above the lower platform, and the two parts are not connected. The upper part of the platform includes an upper support frame (2), an electromagnet (1), and a suspension vibration sensor (5) for suspension vibration isolation; The upper part of the platform is supported by the upper support frame (2), and electromagnets (1) are symmetrically arranged on both sides of the upper part of the platform. Suspension vibration sensors (5) are symmetrically arranged on both sides of the upper part of the platform. The lower part of the platform includes a lower support frame (6), a hollow groove (4), damping particles (3), and a vibration sensor (7), which are used for particle damping and vibration reduction. The lower part of the platform is supported by a lower support frame (6), and vibration sensors (7) are symmetrically arranged on both sides of the lower part of the platform. A hollow groove (4) is set in the lower part of the platform, and the groove is filled with damping particles (3). The lower support frame (6) is provided with a particle damping output and recovery channel, which is used to output and recover damping particles according to the required stiffness and damping of the lower support frame (6) and the corresponding number of damping particles. When the vibration reduction effect is met, the particle damping output and recovery channel is closed. When the vibration reduction effect does not meet the requirements, the particle damping output and recovery channel is opened according to the calculation and statistical results of the damping particles to increase or decrease the damping particles. The above-mentioned vibration isolation test platform operates by performing multi-segment vibration isolation under vibration excitation. The method includes the following steps: S1. Monitor the suspension vibration of the upper part of the platform in real time through the suspension vibration sensor, collect the signal, and transmit the signal to the suspension vibration controller; S2. Calculate the control current using the signal transmitted in S1 through the suspension vibration controller; S3. The electromagnet is driven by the control current to generate a response electromagnetic force for active vibration reduction. S4. After vibration reduction at the top of the platform, vibration sensors are used to monitor the vibration at the bottom of the platform and collect monitoring signals. S5. Input the collected monitoring signals into the vibration controller to calculate the required stiffness and damping; S6. The number of damping particles is controlled by the calculated stiffness and damping, and the output and recovery of damping particles are carried out; thereby changing the stiffness and damping of the lower part of the platform in real time to achieve active vibration reduction. The specific process for controlling the number of damping particles based on the stiffness and damping calculated in S5 and S6 is as follows: The required number of damping particles is calculated based on the maximum difference between the vibration displacement of the lower support frame and the target vibration displacement, as well as the physical properties of the filling material, and the number of damping particles is increased or decreased accordingly.

2. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 1, characterized in that, The electromagnets (1) are fixed to the upper part of the platform by bolts, and two of them are connected in series and arranged horizontally.

3. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 1, characterized in that, The damping particles (3) are detachably installed in the hollow groove.

4. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 3, characterized in that, The damping particles (3) are spherical or tetrahedral in shape to ensure good flowability of the damping particles (3) in the hollow groove inside the lower support frame.

5. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 1, characterized in that, The suspension vibration sensor (5) is connected to the suspension vibration controller; the vibration sensor (7) is connected to the vibration controller.

6. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 1, characterized in that, The signals in S1 include 4 suspension gap signals and 2 acceleration signals; the 4 suspension gap signals are mutually redundant, and the 2 acceleration signals are mutually redundant.

7. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 1, characterized in that, In step S2, an acceleration loop is added to the PID control algorithm when calculating the control current. The formula for calculating the control current is as follows: ； in, For acceleration loop gain, The vertical acceleration of the upper frame. The acceleration signal is obtained by differentiating the interval twice.

8. The working method of the vibration isolation test platform combining particle damping and electromagnetic levitation according to claim 1, characterized in that, The physical properties of the filling material include its elastic modulus, damping modulus, and related dimensions.

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