阅读说明：本技术 一种共振频率自适应快速可调的动力吸振结构及方法 (Dynamic vibration absorption structure and method with self-adaptive and fast-adjustable resonance frequency ) 是由 李星 田鑫 尹磊磊 姚璐 杨航 于 2021-06-22 设计创作，主要内容包括：本发明公开了一种共振频率自适应快速可调的动力吸振结构及方法。该动力吸振结构发动机侧悬置支架、动力吸振器弹性单元、动力吸振器质量块,动力吸振器质量块的外侧设置有施力装置,施力装置可以对动力吸振器质量块施加沿其振动方向的大小和方向均可调的电磁力,发动机侧悬置支架的主体上设置有加速度传感器,加速度传感器电连接有控制器。通过控制器控制施力装置实时调节作用在动力吸振器质量块上的电磁力,进而改变动力吸振器的共振频率,使其与机械系统瞬时的振动频率相同,从而实现动力吸振器共振频率的实时、快速调整,并与机械系统振动频率的迅速匹配,达到更好的吸振效果,且满足发动机工作频率快速连续变化时的吸振要求,适用范围广。(The invention discloses a dynamic vibration absorption structure with self-adaptive and fast adjustable resonance frequency and a method. The dynamic vibration absorbing structure comprises an engine side suspension support, a dynamic vibration absorber elastic unit and a dynamic vibration absorber mass block, wherein a force application device is arranged on the outer side of the dynamic vibration absorber mass block, the force application device can apply electromagnetic force with adjustable vibration direction and adjustable vibration direction to the dynamic vibration absorber mass block, an acceleration sensor is arranged on a main body of the engine side suspension support, and the acceleration sensor is electrically connected with a controller. The controller controls the force application device to adjust the electromagnetic force acting on the mass block of the dynamic vibration absorber in real time, so that the resonance frequency of the dynamic vibration absorber is changed to be the same as the instantaneous vibration frequency of a mechanical system, the real-time and quick adjustment of the resonance frequency of the dynamic vibration absorber is realized, the dynamic vibration absorber is quickly matched with the vibration frequency of the mechanical system, a better vibration absorption effect is achieved, the vibration absorption requirement when the working frequency of an engine is changed quickly and continuously is met, and the application range is wide.)

1. A dynamic vibration absorption structure with self-adaptive and fast adjustable resonance frequency is characterized by comprising an engine side suspension bracket (1), a dynamic vibration absorber elastic unit (2) and a dynamic vibration absorber mass block (3), the engine side suspension bracket (1) is elastically connected with the dynamic vibration absorber mass block (3) through the dynamic vibration absorber elastic unit (2), the outside of the mass block (3) of the dynamic vibration absorber is provided with a force application device which can apply electromagnetic force to the mass block (3) of the dynamic vibration absorber, the size and the direction of the electromagnetic force can be adjusted along the vibration direction, an acceleration sensor (6) is arranged on the main body of the engine side suspension bracket (1), the acceleration sensor (6) is electrically connected with a controller (7), and the output end of the controller (7) is electrically connected with the force application device.

2. The dynamic vibration absorber structure with adaptive and fast adjustable resonance frequency according to claim 1, wherein the force applying device comprises a solenoid holder (4) and a solenoid (5), the solenoid (5) is arranged on the inner side surface of the solenoid holder (4), and the dynamic vibration absorber mass (3) extends into the interior of the solenoid (5) and can freely vibrate.

3. The dynamic-vibration absorbing structure with adaptive and fast adjustable resonance frequency according to claim 2 is characterized in that the electromagnetic coil holder (4) and the dynamic-vibration absorber mass (3) are both cylindrical structures and are coaxially arranged.

4. The dynamic-vibration absorbing structure with adaptive and fast adjustable resonance frequency according to claim 1, wherein the dynamic-vibration absorber elastic unit (2) comprises a support pin (21) and an elastic body (22), the bottom end of the support pin (21) is fixed on the top surface of the engine-side suspension bracket (1), the elastic body (22) is sleeved on the outer side of the support pin (21), and the dynamic-vibration absorber mass block (3) is sleeved on the outer side of the elastic body (22).

5. The structure of claim 4, wherein the elastic body (22) is made of rubber material.

6. The structure for self-adaptive fast and adjustable dynamic vibration absorption of resonance frequency according to claim 4, characterized in that the center of the mass (3) of the dynamic vibration absorber is provided with a central slot (31) therethrough, and the central slot (31) is a cylindrical hole.

7. The dynamic vibration absorbing structure with adaptive and fast adjustable resonance frequency according to claim 1, wherein the controller (7) is configured to receive the vibration acceleration signal of the engine side suspension bracket (1) output by the acceleration sensor (6), calculate the magnitude and direction of the electromagnetic force required to be applied to the dynamic vibration absorber mass (3) when the resonance frequency of the dynamic vibration absorber mass (3) is the same as the vibration frequency of the engine side suspension bracket (1), and issue the instruction for controlling the force application device to adjust the electromagnetic force acting on the dynamic vibration absorber mass (3) to the desired magnitude and direction of the electromagnetic force.

8. A dynamic vibration absorbing method of adaptively rapidly adjusting a resonance frequency using the dynamic vibration absorbing structure of claim 1, comprising the steps of:

acquiring a vibration acceleration signal of a mechanical system;

calculating the vibration frequency of the mechanical system according to the vibration acceleration signal of the mechanical system;

calculating the magnitude and direction of electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system;

and adjusting the electromagnetic force acting on the mass block of the dynamic vibration absorber to reach the magnitude and direction of the electromagnetic force, and changing the resonance frequency of the dynamic vibration absorber to be the same as the vibration frequency of the mechanical system.

9. The method of claim 8 wherein calculating the magnitude and direction of the electromagnetic force required to be applied to the mass of the dynamic vibration absorber to achieve the same resonant frequency of the dynamic vibration absorber as the vibration frequency of the mechanical system comprises: acquiring the rigidity of an elastic unit of the dynamic vibration absorber and the mass of a mass block of the dynamic vibration absorber; estimating the amplitude of the exciting force of the mechanical system; and calculating the electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system according to the vibration frequency of the mechanical system, the amplitude of the exciting force, the rigidity of the elastic unit of the dynamic vibration absorber and the mass of the mass block of the dynamic vibration absorber.

10. The method for adaptive fast dynamic vibration absorption of resonance frequency according to claim 8 wherein the magnitude and direction of the electromagnetic force acting on the mass block of the dynamic vibration absorber are adjusted to change the resonance frequency of the dynamic vibration absorber to be the same as the vibration frequency of the mechanical system by changing the magnitude and direction of the current generating the magnetic field.

Technical Field

The invention relates to the field of dynamic vibration absorbers, in particular to a dynamic vibration absorption structure and a dynamic vibration absorption method with self-adaptive and fast adjustable resonance frequency.

Background

The dynamic vibration absorber is a device for reducing the vibration of an object by absorbing the vibration energy of the object by using a resonance system, as shown in fig. 1, and the principle of the dynamic vibration absorber is to attach a mass-elastic body resonance system to a vibrating mechanical system, and the reaction force generated by the additional system when the additional system resonates can reduce the vibration of the vibrating object. The dynamic vibration absorber is particularly useful when the excitation force is mainly single frequency or the frequency is very low, and a general vibration isolator is not suitable. It is also possible to cancel vibrations of different frequencies by adding a series of such vibration absorbers.

The conventional dynamic vibration absorber is mainly used in the fields of automobile engine suspension supports and the like. As shown in fig. 2 and 3, most of the dynamic vibration absorbers only absorb vibration at a single resonance frequency, and when a plurality of resonance frequency peaks occur, the conventional dynamic vibration absorbers are difficult to meet the vibration absorption requirements; at the moment, the frequency-adjustable dynamic vibration absorber can be more suitable for various complex working conditions of the engine.

The resonance frequency adjusting mode of the existing frequency adjustable dynamic vibration absorber mainly comprises a mechanical rigidity adjusting method, a manual mass adjusting method, a fluid mass adjusting method and the like, and has the problems of low adjusting speed, incapability of meeting the requirement of continuous and quick change working conditions of the resonance frequency and the like.

Chinese patent application publication No. CN103267085A, for example, discloses a rotary mechanical rotor hydraulic multi-frequency dynamic vibration absorber that allows the frequency of a Tuned Mass Damper (TMD) subsystem to be always in agreement with the rotor primary system frequency by real-time continuous adjustment of the mass. The dynamic vibration absorber is designed with a special fluid mass structure, and the mass of the dynamic vibration absorber is changed by changing the mass of the fluid, so that the requirement of the rotary mechanical rotor on forming continuous real-time vibration absorption for vibration of various frequency components is met. By changing the mass of the fluid, the resonant frequency of the dynamic vibration absorber can be continuously changed; however, in the technical scheme, the change of the mass of the dynamic vibration absorber needs a long time to complete, and because the time for changing the mass is too long, the working frequency of the dynamic vibration absorber cannot match the rhythm of the change of the resonant frequency of the main system, so that the vibration absorber cannot realize a good vibration absorbing effect, and the application range of the vibration absorber is greatly limited.

The invention discloses a dynamic vibration absorber with the publication number of CN103206474A, which discloses a dynamic vibration absorber capable of quickly adjusting the resonance frequency, wherein a mass block and a rubber elastic body are arranged in a connecting rod with one end capable of being movably adjusted, and the size of the rubber elastic body which actually acts is changed by moving or rotating the mass block, so that the rigidity value of the dynamic vibration absorber is changed; the mass blocks can be used as a whole or a plurality of mass blocks are connected into a whole through threaded bolts, so that the mass of the dynamic vibration absorber can be changed; and finally, the resonance frequency of the dynamic vibration absorber is adjusted by the two adjusting modes. The invention can change the rigidity by a mechanical mode or change the mass by a manual mode, and can continuously change the resonance frequency of the dynamic vibration absorber; however, the change of the stiffness and the mass of the dynamic vibration absorber in the invention needs to consume a long time, meanwhile, the adjustment of the mass needs to stop the system, the efficiency of the adjustment of the resonant frequency of the dynamic vibration absorber is low, the speed is slow, the working condition that the resonant frequency of the main system continuously and rapidly changes is difficult to meet, a good vibration absorbing effect is difficult to obtain, and the application range of the dynamic vibration absorber is greatly limited.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a dynamic vibration absorption structure and a dynamic vibration absorption method with self-adaptive and quickly adjustable resonant frequency, which can quickly complete the adjustment of the resonant frequency of a dynamic vibration absorber, can timely and adaptively match the vibration frequency of a mechanical system and have better vibration absorption effect.

In order to solve the technical problem, the dynamic vibration absorption structure with the self-adaptive and fast-adjustable resonance frequency comprises an engine side suspension support, a dynamic vibration absorber elastic unit and a dynamic vibration absorber mass block, wherein the engine side suspension support and the dynamic vibration absorber mass block are elastically connected through the dynamic vibration absorber elastic unit, a force application device is arranged on the outer side of the dynamic vibration absorber mass block, the force application device can apply electromagnetic force with adjustable vibration direction and size to the dynamic vibration absorber mass block, an acceleration sensor is arranged on a main body of the engine side suspension support, the acceleration sensor is electrically connected with a controller, and the output end of the controller is electrically connected with the force application device.

In the dynamic vibration absorption structure with the self-adaptive and fast-adjustable resonance frequency, the instantaneous acceleration of the dynamic vibration absorption structure during vibration is measured through an acceleration sensor arranged on an engine side suspension support, the real-time vibration frequency of the engine side suspension support is obtained through calculation, and then a controller controls a force application device to adjust the electromagnetic force acting on a mass block of the dynamic vibration absorption device in real time, so that the resonance frequency of the dynamic vibration absorption device is changed to be the same as the current vibration frequency of a mechanical system, the real-time and fast adjustment of the resonance frequency of the dynamic vibration absorption device is realized, the vibration frequency of the dynamic vibration absorption device is rapidly matched with the vibration frequency of the mechanical system, a better vibration absorption effect is achieved, the vibration absorption requirement when the working frequency of an engine is rapidly and continuously changed is met, and the application range is wide.

As an improvement of the self-adaptive and fast-adjustable dynamic vibration absorption structure of the resonant frequency, the force application device comprises an electromagnetic coil retainer and an electromagnetic coil, the inner side surface of the electromagnetic coil retainer is provided with the electromagnetic coil, and the mass block of the dynamic vibration absorber extends into the electromagnetic coil and can freely vibrate. Electromagnetic force is generated through the electromagnetic coil, the current of the electromagnetic coil is adjusted by the controller according to needs, real-time and quick adjustment of the electromagnetic force is achieved, real-time and quick adjustment of the resonance frequency of the dynamic vibration absorber is achieved, and the real-time vibration frequency of the engine side suspension support is matched in a self-adaptive mode.

In order to solve the technical problem, the invention discloses a dynamic vibration absorption method with self-adaptive and fast adjustable resonance frequency, which comprises the following steps:

acquiring a vibration acceleration signal of a mechanical system;

calculating the vibration frequency of the mechanical system according to the vibration acceleration signal of the mechanical system;

calculating the magnitude and direction of electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system;

and adjusting the electromagnetic force acting on the mass block of the dynamic vibration absorber to reach the magnitude and direction of the electromagnetic force, and changing the resonance frequency of the dynamic vibration absorber to be the same as the vibration frequency of the mechanical system.

In the dynamic vibration absorption method with the self-adaptive and fast-adjustable resonant frequency, the vibration acceleration of the mechanical system is monitored in real time, the vibration frequency of the mechanical system is calculated, and the electromagnetic force which needs to act on the mass block of the dynamic vibration absorber is adjusted, so that the magnitude of the electromagnetic force is adjusted, the resonant frequency of the dynamic vibration absorber is fast changed, the self-adaptive matching of the vibration frequency of the mechanical system is fast realized, a better vibration absorption effect is achieved, and the dynamic vibration absorption method can also meet the better vibration absorption requirement when the vibration frequency of the mechanical system is fast and continuously changed.

As an improvement of the resonance frequency self-adaptive and fast adjustable dynamic vibration absorption method, the calculation of the magnitude and direction of the electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system comprises the following steps: acquiring the rigidity of an elastic unit of the dynamic vibration absorber and the mass of a mass block of the dynamic vibration absorber; obtaining the amplitude of the exciting force of a mechanical system; and calculating the electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system according to the vibration frequency of the mechanical system, the amplitude of the exciting force, the rigidity of the elastic unit of the dynamic vibration absorber and the mass of the mass block of the dynamic vibration absorber. The required electromagnetic force is obtained through calculation according to the real-time vibration frequency of the mechanical system, the amplitude of the exciting force of the mechanical system, the rigidity of the dynamic vibration absorber and the mass of the mass block of the dynamic vibration absorber.

In conclusion, by adopting the dynamic vibration absorption structure and the dynamic vibration absorption method with the self-adaptive and fast adjustable resonance frequency, the real-time self-adaptive adjustment of the resonance frequency of the dynamic vibration absorber is realized by controlling the electromagnetic force acting on the mass block of the dynamic vibration absorber, the vibration absorption problem under the working condition of fast and continuous change of the vibration frequency of a mechanical system can be effectively solved, the manual intervention is not needed, the problems of low resonance frequency adjustment efficiency and low speed of the dynamic vibration absorber in the prior art are well solved, and the application range of the dynamic vibration absorber is greatly expanded.

Drawings

In the drawings:

fig. 1 is a schematic diagram of the structure of a dynamic vibration absorber.

Fig. 2 is a structural view of a dynamic vibration absorber of a conventional engine mount bracket.

Fig. 3 is a disassembled structure diagram of a dynamic vibration absorber of a conventional engine suspension bracket.

Fig. 4 is a schematic view of the vibration absorbing structure of the present invention.

Fig. 5 is a schematic exploded view of the vibration absorbing structure of the present invention.

In the figure: 1. an engine side suspension bracket; 2. a dynamic vibration absorber elastic unit; 21. a support pin; 22. an elastomer; 3. a dynamic vibration absorber mass block; 31. a central slot; 4. an electromagnetic coil holder; 5. an electromagnetic coil; 6. an acceleration sensor; 7. and a controller.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

Fig. 4 and 5 show a resonant frequency adaptive fast adjustable dynamic vibration absorbing structure of the present invention. As shown in fig. 4 and 5, the dynamic vibration absorbing structure includes an engine side suspension bracket 1, a dynamic vibration absorber elastic unit 2, and a dynamic vibration absorber mass block 3, wherein the engine side suspension bracket 1 and the dynamic vibration absorber mass block 3 are elastically connected through the dynamic vibration absorber elastic unit 2, a force application device is disposed outside the dynamic vibration absorber mass block 3, the force application device can apply electromagnetic force to the dynamic vibration absorber mass block 3, the magnitude and direction of the electromagnetic force can be adjusted along the vibration direction, an acceleration sensor 6 is disposed on the body of the engine side suspension bracket 1, the acceleration sensor 6 is electrically connected to a controller 7, and the output end of the controller 7 is electrically connected to the force application device.

When the vibration absorber is used, the engine side suspension bracket 1 is excited by vibration from an engine to generate vibration, and the vibration is transmitted to the dynamic vibration absorber mass block 3 through the dynamic vibration absorber elastic unit 2 to drive the dynamic vibration absorber mass block to vibrate together, so that a resonance vibration absorbing system is formed and the vibration of the engine side suspension bracket 1 is absorbed. The instantaneous vibration frequency of the engine-side suspension bracket 1 is the same as the acceleration change frequency thereof, and acceleration information of the engine-side suspension bracket 1 in the vibration direction can be measured by the acceleration sensor 6, and then the vibration frequency can be calculated. Because the vibration excitation frequency of the engine is not fixed, the situation of rapid and continuous change can occur, the engine side suspension bracket 1 is changed, at the moment, the controller 7 controls and adjusts the force application device, so that the electromagnetic force acting on the mass block 3 of the dynamic vibration absorber is changed, the resonance frequency (natural frequency) of the dynamic vibration absorber is changed, until the resonance frequency is the same as the instantaneous vibration frequency of the engine side suspension bracket 1, and thus, the mass block 3 of the dynamic vibration absorber has larger amplitude, absorbs more vibration energy, plays the best vibration absorption role, and also meets the vibration absorption requirement when the working frequency of the engine is rapidly and continuously changed.

Optionally, the force applying device includes a cylindrical electromagnetic coil holder 4 and an electromagnetic coil 5, the electromagnetic coil 5 is disposed on an inner side surface of the electromagnetic coil holder 4, and the dynamic vibration absorber mass block 3 is also cylindrical, extends into the electromagnetic coil 5, is arranged coaxially with the electromagnetic coil holder 4, and can freely vibrate inside the dynamic vibration absorber without interference. The electromagnetic force is generated through the coil structure, and the size and the direction of the electromagnetic force can be controlled by controlling the current flowing through the electromagnetic coil 5, so that the electromagnetic force generating device is simple in structure and quick in response.

Optionally, the dynamic vibration absorber elastic unit 2 includes a support pin 21 and an elastic body 22, a bottom end of the support pin 21 is fixed to a top surface of the engine-side suspension bracket 1, the elastic body 22 is sleeved on an outer side of the support pin 21, and the dynamic vibration absorber mass block 3 is sleeved on an outer side of the elastic body 22. The elastic body 22 is cylindrical and made of rubber materials, the middle part of the mass block 3 of the dynamic vibration absorber is provided with a through cylindrical central slotted hole 31, the elastic body 22, the mass block 3 of the dynamic vibration absorber and the supporting pin 21 are fixedly connected through a vulcanization method, the production and the manufacture are easy, and the connection strength is good because the parts are connected in a surface-to-surface mode.

In the above-mentioned dynamic vibration absorbing structure, the controller 7 is configured to receive a vibration acceleration signal of the engine-side suspension bracket 1 output by the acceleration sensor 6, calculate the magnitude and direction of the electromagnetic force required to be applied to the dynamic vibration absorber mass block 3 when the resonance frequency of the dynamic vibration absorber mass block 3 is the same as the vibration frequency of the engine-side suspension bracket 1, and issue an instruction for controlling the force application device to adjust the electromagnetic force acting on the dynamic vibration absorber mass block 3 to the magnitude and direction of the electromagnetic force required. The controller is a control brain of the whole system, and firstly calculates the instantaneous vibration frequency of the engine side suspension bracket 1 according to the real-time vibration acceleration of the engine side suspension bracket 1; then calculating the magnitude and direction of electromagnetic force required to be applied to the mass block 3 of the dynamic vibration absorber when the resonance frequency of the mass block 3 of the dynamic vibration absorber is the same as the vibration frequency of the engine side suspension bracket 1; and then, sending a command to control the action of the force application device, and enabling the electromagnetic force acting on the mass block 3 of the dynamic vibration absorber to achieve the required electromagnetic force magnitude and direction, so as to achieve the purpose of self-adaptively adjusting the resonance frequency of the dynamic vibration absorber and match the vibration frequency of the engine side suspension bracket 1 in real time.

The invention relates to a dynamic vibration absorption method with self-adaptive and fast adjustable resonant frequency by utilizing the device, which comprises the following steps:

the method comprises the following steps: and acquiring a vibration acceleration signal of the mechanical system.

The acceleration sensor is used for measuring an acceleration signal of the mechanical system in the vibration direction, the acceleration model is continuously changed in the vibration process, and the frequency of the acceleration signal is the same as the vibration frequency of the mechanical system.

Step two: and calculating the vibration frequency of the mechanical system according to the vibration acceleration signal of the mechanical system.

Step three: calculating the magnitude and direction of electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system;

in FIG. 1, let m₁、m₂The mass of the mechanical system and the mass block of the dynamic vibration absorber; k is a radical of₁Is a mechanical system and a rigid baseVibration isolator stiffness, k between₂The connection rigidity between the dynamic vibration absorber and the mechanical system is set; x is the number of₁、x₂The motion displacement of a mechanical system and a mass block of the vibration absorber is adopted; f₁、F₂Is the amplitude of the force acting on the mechanical system, the absorber mass.

The differential equations of motion for m1 and m2 are:

by assuming a harmonic solution of the form:

x₁(t)＝X₁ sin(ωt),x₂(t)＝X₂ sin(ωt) (2)

m can be obtained₁And m₂The amplitude of the steady state motion of (a) is:

to make the original mechanical system m₁Is zero, x in the above formula (3)₁Is equal to zero, then there is:

if the mechanical system is operated at near resonance before the dynamic vibration absorber is used, then there is ω²＝k₁/m₁. When the dynamic vibration absorber is designed, the resonance frequency of the dynamic vibration absorber meets the following conditions:

the amplitude of the mechanical system will be zero when it is operated at the original resonance frequency after the mechanical system is installed with the dynamic vibration absorber.

Is carried by the above two-degree-of-freedom systemThe dynamic analysis shows that the dynamic vibration absorber in fig. 1 is under the action force F₁Under the condition of (1), its resonance frequency is equal to F₁/F₀It is related. Due to acting on the mechanical system m₁The force can be measured by a sensor and is measured by k₂、m₂Two parameters are determined, if F₁The resonance frequency of the dynamic vibration absorber in the formula (5) can be adjusted quickly and continuously, so that the requirement of a mechanical system m is met₁The vibration absorption requirement when the working frequency is changed rapidly and continuously.

Therefore, the specific calculation process of the required electromagnetic force can be as follows: acquiring the rigidity of an elastic unit of the dynamic vibration absorber and the mass of a mass block of the dynamic vibration absorber; obtaining the amplitude of the exciting force of a mechanical system; and calculating the electromagnetic force required to be applied to the mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system according to the vibration frequency and the amplitude of the exciting force of the mechanical system, the rigidity of the elastic unit of the dynamic vibration absorber and the mass of the mass block of the dynamic vibration absorber.

Step four: adjusting the electromagnetic force acting on the mass block of the dynamic vibration absorber to achieve the magnitude and direction of the electromagnetic force, and changing the resonance frequency of the dynamic vibration absorber to be the same as the vibration frequency of a mechanical system;

the specific way to adjust the electromagnetic force acting on the mass block of the dynamic vibration absorber is to change the magnitude and direction of the current generating the magnetic field. The regulation is rapid, efficient and can be continuously varied.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.