CN113565912B - Dynamic vibration absorbing structure and method with self-adaptive and rapid-adjustable resonant frequency - Google Patents
Dynamic vibration absorbing structure and method with self-adaptive and rapid-adjustable resonant frequency Download PDFInfo
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- CN113565912B CN113565912B CN202110692199.9A CN202110692199A CN113565912B CN 113565912 B CN113565912 B CN 113565912B CN 202110692199 A CN202110692199 A CN 202110692199A CN 113565912 B CN113565912 B CN 113565912B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/1005—Vibration-dampers; Shock-absorbers using inertia effect characterised by active control of the mass
- F16F7/1011—Vibration-dampers; Shock-absorbers using inertia effect characterised by active control of the mass by electromagnetic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
- F16F7/108—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on plastics springs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a dynamic vibration absorber structure and a dynamic vibration absorber method with self-adaptive and rapid adjustable resonance frequency. The power vibration absorbing structure comprises an engine side suspension bracket, a power vibration absorber elastic unit and a power vibration absorber mass block, wherein a force application device is arranged on the outer side of the power vibration absorber mass block, the force application device can apply electromagnetic force which is adjustable along the vibration direction and the direction of the power vibration absorber mass block, an acceleration sensor is arranged on the main body of the engine side suspension bracket, 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 as to change the resonance frequency of the dynamic vibration absorber, and the resonance frequency is the same as the instantaneous vibration frequency of the mechanical system, thereby realizing real-time and rapid adjustment of the resonance frequency of the dynamic vibration absorber, rapidly matching the vibration frequency of the mechanical system, achieving better vibration absorption effect, meeting the vibration absorption requirement when the working frequency of the engine is rapidly and continuously changed, and having wide application range.
Description
Technical Field
The invention relates to the field of dynamic vibration absorbers, in particular to a dynamic vibration absorber structure and a method with self-adaptive and rapid adjustable resonance frequency.
Background
Dynamic vibration absorbers are devices that absorb the vibration energy of an object by using a resonance system to reduce the vibration of the object, and as shown in fig. 1, the principle is to add a mass elastomer resonance system to a vibrating mechanical system, and the reaction force generated by the additional system at resonance can reduce the vibration of the vibrating object. Dynamic vibration absorbers are particularly useful when the excitation force is predominantly single frequency, or very low frequency, and a typical vibration isolator is not suitable. If a series of such vibration absorbers are added, vibrations of different frequencies can be offset.
The existing dynamic vibration absorber is mainly used in the fields of automobile engine suspension brackets 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 existing dynamic vibration absorbers hardly meet the vibration absorption requirements; at this time, the frequency-adjustable dynamic vibration absorber can be more suitable for various complex working conditions of the engine.
The existing resonant frequency adjusting mode of the 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 that the adjusting speed is low, the requirement of the continuous and rapid change working condition of the resonant frequency cannot be met and the like.
For example, chinese patent publication No. CN103267085a discloses a rotary machine rotor hydraulic multi-frequency dynamic vibration absorber that continuously adjusts the mass in real time so that the frequency of a Tuned Mass Damper (TMD) subsystem is always consistent with the rotor main system frequency. The dynamic vibration absorber designs a special fluid mass structure, and changes the mass of the dynamic vibration absorber by changing the mass of fluid, so that the requirement of the rotary machine rotor on continuous real-time vibration absorption formed by vibration of various frequency components is met. By varying the mass of the fluid, the resonant frequency of the dynamic vibration absorber can be continuously varied; however, in the technical scheme, the change of the mass of the dynamic vibration absorber needs a long time to finish, and because the time of the mass change is too long, the working frequency of the dynamic vibration absorber cannot be matched with the rhythm of the change of the resonance frequency of the main system, so that the vibration absorber cannot realize a good vibration absorbing effect, and the application range of the dynamic vibration absorber is greatly limited.
The invention discloses a dynamic vibration absorber with the publication number of CN103206474A, which can quickly adjust the resonance frequency, and the invention changes the size of the rubber elastic body which actually acts by loading a mass block and the rubber elastic body into a connecting rod with one end capable of being movably adjusted and moving or rotating the mass block, so as to change the rigidity value of the dynamic vibration absorber; 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; through the two adjusting modes, the resonance frequency of the dynamic vibration absorber is finally adjusted. The invention can continuously change the resonance frequency of the dynamic vibration absorber by changing the rigidity in a mechanical way or changing the mass in a manual way; however, in the invention, the rigidity and the quality of the dynamic vibration absorber are changed in a long time, the system is required to stop working in the adjustment of the quality, the efficiency and the speed of adjusting the resonance frequency of the dynamic vibration absorber are low, the continuous and rapid change working condition of the resonance frequency of the main system is difficult to meet, the 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 absorbing structure and a method with self-adaptive and rapid adjustable resonant frequency, which can rapidly complete the adjustment of the resonant frequency of a dynamic vibration absorber, timely and self-adaptively match the vibration frequency of a mechanical system and have better vibration absorbing effect.
In order to solve the technical problems, the invention provides a power vibration absorbing structure with self-adaptive and rapid adjustable resonance frequency, which comprises an engine side suspension bracket, a power vibration absorber elastic unit and a power vibration absorber mass block, wherein the engine side suspension bracket is elastically connected with the power vibration absorber mass block through the power vibration absorber elastic unit, a force application device is arranged on the outer side of the power vibration absorber mass block, the force application device can apply electromagnetic force with adjustable size and direction along the vibration direction to the power vibration absorber mass block, an acceleration sensor is arranged on the main body of the engine side suspension bracket, 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 power vibration absorbing structure with the self-adaptive and quick-adjustable resonance frequency, the instantaneous acceleration of the vibration is measured through the acceleration sensor arranged on the engine side suspension bracket, the real-time vibration frequency of the engine side suspension bracket is calculated, the electromagnetic force acting on the mass block of the power vibration absorber is regulated in real time through the controller to control the force application device, the resonance frequency of the power vibration absorber is changed to be the same as the vibration frequency of a mechanical system at the moment, and therefore the real-time and quick adjustment of the resonance frequency of the power vibration absorber is realized, the vibration frequency of the power vibration absorber is quickly matched with the vibration frequency of the mechanical system, the better vibration absorbing effect is achieved, and the vibration absorbing requirement when the working frequency of the engine is changed in a quick continuous manner is met.
As an improvement of the dynamic vibration absorbing structure with the self-adaptive and rapid adjustable resonant frequency, the force application device comprises an electromagnetic coil retainer and an electromagnetic coil, wherein the electromagnetic coil is arranged on the inner side surface of the electromagnetic coil retainer, and the dynamic vibration absorber mass block stretches into the electromagnetic coil and can vibrate freely. Electromagnetic force is generated through the electromagnetic coil, and then the current of the electromagnetic coil is regulated by the controller according to the requirement, so that the real-time and rapid adjustment of the electromagnetic force is realized, the real-time and rapid adjustment of the resonance frequency of the dynamic vibration absorber is further realized, and the real-time vibration frequency of the engine side suspension bracket is adaptively matched.
In order to solve the technical problems, the invention relates to a dynamic vibration absorbing method with self-adaptive and rapid adjustable resonant 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 a 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 electromagnetic force acting on the mass block of the dynamic vibration absorber to reach the magnitude and the 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 absorbing method with the self-adaptive and quick-adjustable resonant frequency, the vibration acceleration of the mechanical system is monitored in real time, the vibration frequency of the mechanical system and the electromagnetic force required to act on the mass block of the dynamic vibration absorber are calculated, so that the electromagnetic force is adjusted, the resonant frequency of the dynamic vibration absorber is quickly changed, the self-adaptive matching of the vibration frequency of the mechanical system is quickly realized, the better vibration absorbing effect is achieved, and the better vibration absorbing requirement when the vibration frequency of the mechanical system is quickly and continuously changed can also be met.
As an improvement of the dynamic vibration absorbing method with the self-adaptive and rapid adjustable resonant frequency, when the resonant frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system, the electromagnetic force and the direction required to be applied to the mass block of the dynamic vibration absorber are calculated, and the method comprises the following steps: acquiring the rigidity of the elastic unit of the dynamic vibration absorber and the mass of the mass block of the dynamic vibration absorber; acquiring the amplitude of exciting force of a mechanical system; and calculating 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 by the real-time vibration frequency of the mechanical system, the amplitude of exciting force of the mechanical system, the rigidity of the dynamic vibration absorber and the mass of the dynamic vibration absorber.
In summary, by adopting the dynamic vibration absorbing structure and the method with the self-adaptive and rapid adjustable resonant frequency, the real-time self-adaptive adjustment of the resonant 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 absorbing problem of a mechanical system under the working condition that the vibration frequency of the mechanical system is rapidly and continuously changed can be effectively solved, the human intervention is not needed, the problems of low resonant frequency adjusting 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 a dynamic vibration absorber.
Fig. 2 is a diagram of a dynamic vibration absorber of a conventional engine mount bracket.
Fig. 3 is a split structure diagram of a dynamic vibration absorber of a conventional engine suspension bracket.
Fig. 4 is a schematic view of a shock absorbing structure according to the present invention.
Fig. 5 is a schematic diagram illustrating the disassembly of the shock 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 absorber mass; 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 describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention.
Fig. 4 and 5 show a dynamic vibration absorber structure with self-adaptive and rapid-adjustable resonance frequency according to the present invention. As shown in fig. 4 and 5, the dynamic vibration absorbing structure comprises 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 arranged on the outer side of the dynamic vibration absorber mass block 3, the force application device can apply electromagnetic force with adjustable size and direction along the vibration direction to the dynamic vibration absorber mass block 3, 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.
When the vibration absorber is used, the engine side suspension bracket 1 is excited by vibration from an engine to generate vibration, the vibration is transmitted to the power absorber mass block 3 through the power absorber elastic unit 2 and drives the power 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 of the engine-side suspension bracket itself, and the acceleration information of the engine-side suspension bracket 1 in the vibration direction can be measured by the acceleration sensor 6, and the vibration frequency can be calculated. Since the vibration excitation frequency of the engine is not fixed, rapid and continuous change may occur, and the engine side suspension bracket 1 also changes, at this time, the controller 7 controls and adjusts the force application device to change the electromagnetic force acting on the power absorber mass block 3, so that the resonance frequency (natural frequency) of the power absorber changes until the resonance frequency is the same as the instantaneous vibration frequency of the engine side suspension bracket 1, and thus the power absorber mass block 3 has larger amplitude, absorbs more vibration energy, plays an optimal vibration absorption role, and also meets the vibration absorption requirement when the working frequency of the engine changes rapidly and continuously.
Optionally, the force application device comprises a cylindrical electromagnetic coil holder 4 and an electromagnetic coil 5, the electromagnetic coil 5 is arranged on the inner side surface of the electromagnetic coil holder 4, the power vibration absorber mass block 3 is also cylindrical, stretches into the electromagnetic coil 5, is coaxially arranged with the electromagnetic coil holder 4, can vibrate freely in the electromagnetic coil holder, and cannot interfere. The electromagnetic force is generated through the coil structure, the magnitude and the direction of the electromagnetic force can be controlled by controlling the current flowing through the electromagnetic coil 5, and the electromagnetic coil has a simple structure and quick response.
Alternatively, the dynamic vibration absorber elastic unit 2 includes 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. The elastic body 22 is cylindrical and made of rubber materials, a through cylindrical central slot hole 31 is formed in the middle of the power vibration absorber mass block 3, the elastic body 22 is fixedly connected with the power vibration absorber mass block 3 and the supporting pin 21 through a vulcanization method, the production and the manufacturing are easy, and the connection between the parts is surface-to-surface, so that the connection strength is good.
In the above-described dynamic vibration absorbing structure, the controller 7 is configured to receive the vibration acceleration signal of the engine-side suspension bracket 1 output from 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 a command to control the force application device to adjust the electromagnetic force acting on the dynamic vibration absorber mass 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, 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, the magnitude and the direction of electromagnetic force required to be applied to the dynamic vibration absorber mass block 3 are calculated; then, an instruction is sent to control the force application device to act, the electromagnetic force acting on the mass block 3 of the dynamic vibration absorber reaches the required electromagnetic force magnitude and direction, the purpose of self-adaptively adjusting the resonance frequency of the dynamic vibration absorber is achieved, and the vibration frequency of the engine side suspension bracket 1 is matched in real time.
The invention relates to a dynamic vibration absorbing method capable of self-adapting and rapidly adjusting the resonance frequency by utilizing the device, which comprises the following steps:
step one: and acquiring a vibration acceleration signal of the mechanical system.
And an acceleration sensor is used for measuring an acceleration signal of the mechanical system in the vibration direction, and 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 the direction of electromagnetic force required to be applied to a mass block of the dynamic vibration absorber when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of a mechanical system;
in FIG. 1, let m 1 、m 2 Is the mass of a mechanical system and a mass block of a dynamic vibration absorber; k (k) 1 For isolator stiffness, k between mechanical system and rigid mount 2 The rigidity of connection between the dynamic vibration absorber and the mechanical system is adopted; x is x 1 、x 2 Is the motion displacement of a mechanical system and a mass block of a vibration absorber; f (F) 1 、F 2 Is 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:
x 1 (t)＝X 1 sin(ωt),x 2 (t)＝X 2 sin(ωt) (2)
can obtain m 1 And m 2 The amplitude of steady state motion of (c) is:
to make the original mechanical system m 1 The amplitude of (2) is zero, x in the above formula (3) 1 The molecular fraction of (2) is equal to zero, then there is:
if the mechanical system is operated near resonance before using the dynamic absorber, there is ω 2 ＝k 1 /m 1 . 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 operating at the original resonant frequency after the mechanical system is fitted with the dynamic absorber.
From the analysis of the motion of the two-degree-of-freedom system, the dynamic vibration absorber in FIG. 1 is subjected to the acting force F 1 Under the condition of (1) its resonant frequency is equal to F 1 /F 0 Related to the following. Due to action on mechanical system m 1 The force on the spring can be measured by a sensor, and is represented by k 2 、m 2 Two parameters are determined, if F 1 Can realize rapid continuous adjustment, the resonance frequency of the dynamic vibration absorber in the formula (5) can realize rapid continuous adjustment, thereby meeting the requirement of a mechanical system m 1 Vibration absorption requirements when the operating frequency is changed in rapid succession.
Thus, a specific calculation of the required electromagnetic force may be: acquiring the rigidity of the elastic unit of the dynamic vibration absorber and the mass of the mass block of the dynamic vibration absorber; acquiring the amplitude of 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: the electromagnetic force acting on the mass block of the dynamic vibration absorber is regulated to reach the magnitude and the direction of the electromagnetic force, and the resonance frequency of the dynamic vibration absorber is changed to be the same as the vibration frequency of a mechanical system;
the specific way to adjust the electromagnetic force acting on the mass of the dynamic absorber is to change the magnitude and direction of the current that produces the magnetic field. The regulation is rapid and efficient, and can be continuously changed.
It should be noted that the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but the present invention is described in detail with reference to the foregoing embodiments, and those skilled in the art may modify the technical solutions described in the foregoing embodiments or substitute some of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The power vibration absorbing method with the self-adaptive and rapid-adjustable resonance frequency is characterized by comprising a power vibration absorbing structure with the self-adaptive and rapid-adjustable resonance frequency, wherein the power vibration absorbing structure with the self-adaptive and rapid-adjustable resonance frequency comprises an engine side suspension bracket (1), a power vibration absorber elastic unit (2) and a power vibration absorber mass block (3), the engine side suspension bracket (1) is elastically connected with the power vibration absorber mass block (3) through the power vibration absorber elastic unit (2), a force application device is arranged on the outer side of the power vibration absorber mass block (3), the force application device can apply electromagnetic force with adjustable size and direction along the vibration direction to the power vibration absorber mass block (3), an acceleration sensor (6) is arranged on a 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;
the force application device comprises an electromagnetic coil retainer (4) and an electromagnetic coil (5), wherein the electromagnetic coil (5) is arranged on the inner side surface of the electromagnetic coil retainer (4), and the dynamic vibration absorber mass block (3) stretches into the electromagnetic coil (5) and can vibrate freely; the electromagnetic coil retainer (4) and the dynamic vibration absorber mass block (3) are of cylindrical structures and are coaxially arranged;
the power vibration absorber elastic unit (2) comprises a supporting pin (21) and an elastic body (22), wherein the bottom end of the supporting 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 supporting pin (21), and the power vibration absorber mass block (3) is sleeved on the outer side of the elastic body (22);
the controller (7) is used for receiving a vibration acceleration signal of the engine side suspension bracket (1) output by the acceleration sensor (6), calculating the magnitude and direction of electromagnetic force required to be applied to the power absorber mass block (3) when the resonance frequency of the power absorber mass block (3) is the same as the vibration frequency of the engine side suspension bracket (1), and sending out an instruction for controlling the force application device to adjust the electromagnetic force acting on the power absorber mass block (3) to reach the magnitude and direction of the electromagnetic force required;
the dynamic vibration absorbing method with the self-adaptive and rapid adjustable resonant frequency 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 a 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;
adjusting electromagnetic force acting on a mass block of the dynamic vibration absorber to reach the magnitude and the 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 addition, let m 1 、m 2 Is the mass of a mechanical system and a mass block of a dynamic vibration absorber; k (k) 2 The rigidity of connection between the dynamic vibration absorber and the mechanical system is adopted; f (F) 0 、F 1 For the amplitude of the forces acting on the mechanical system, the absorber mass,
to make the original mechanical system m 1 Amplitude of zero, yielding:
according to the above formula, the specific calculation process of the required electromagnetic force is as follows:
acquiring the rigidity of the elastic unit (2) of the dynamic vibration absorber and the mass of the mass block (3) of the dynamic vibration absorber;
the method comprises the steps of obtaining the amplitude value of exciting force of an engine side suspension bracket (1);
according to the vibration frequency and the amplitude of exciting force of the engine side suspension bracket (1), the rigidity of the elastic unit (2) of the dynamic vibration absorber and the mass of the mass block (3) of the dynamic vibration absorber, when the resonance frequency of the dynamic vibration absorber is the same as the vibration frequency of the engine side suspension bracket (1), the amplitude of force on the mass block (3) of the dynamic vibration absorber is obtained, so that the electromagnetic force required to be applied to the mass block (3) of the dynamic vibration absorber is obtained, and the amplitude of the mass block (1) of the engine side suspension bracket is zero.
2. A dynamic vibration absorbing method with adaptive fast tuning of resonance frequency according to claim 1, characterized in that said elastomer (22) is made of rubber material.
3. The dynamic vibration absorbing method with the self-adaptive and rapid-adjustable resonance frequency according to claim 1, wherein a through central slot hole (31) is formed in the middle of the dynamic vibration absorber mass block (3), and the central slot hole (31) is a cylindrical hole.
4. The method for dynamic vibration absorbing according to claim 1, wherein the specific way of adjusting the electromagnetic force acting on the mass of the dynamic vibration absorber is to change the magnitude and direction of the current generating the magnetic field, in the case that the electromagnetic force acting on the mass of the dynamic vibration absorber is adjusted to reach the magnitude and direction of the electromagnetic force, and the resonant frequency of the dynamic vibration absorber is the same as the vibration frequency of the mechanical system.
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| DE19839464C2 (en) * | 1998-08-29 | 2001-07-05 | Contitech Formteile Gmbh | Electrodynamic actuator with oscillating spring-mass system |
| FR2860658B1 (en) * | 2003-10-01 | 2006-01-13 | Hutchinson | ACTIVE DEVICE FOR DAMPING VIBRATIONS OF A VIBRATION ELEMENT |
| DE102005060779B4 (en) * | 2005-12-16 | 2008-07-10 | Eads Deutschland Gmbh | power generator |
| DE102010029910A1 (en) * | 2010-06-10 | 2011-12-15 | Bayerische Motoren Werke Aktiengesellschaft | Active oscillation damper for motor car, has single spring element units implemented in shape memory alloy of upper and lower spring elements |
| KR101184284B1 (en) * | 2010-06-23 | 2012-09-26 | 주식회사 파브코 | Active dynamic vibration absorber apparatus for vehicle |
| CN203214751U (en) * | 2013-04-03 | 2013-09-25 | 广东邦达实业有限公司 | Dynamic absorber capable of adjusting resonant frequency rapidly |
| DE102013107759B4 (en) * | 2013-07-19 | 2018-05-03 | Trelleborgvibracoustic Gmbh | Vibration damper and vibration damper arrangement |
| CN104637646B (en) * | 2014-12-30 | 2016-08-24 | 中国科学院测量与地球物理研究所 | A kind of vibration isolating mechanism based on proportion electro-magnet |
| CN107023605B (en) * | 2017-06-06 | 2018-08-17 | 哈尔滨工业大学 | Based on magnetostriction with helical structure quartz cycloid recombination mechanism every micro- vibrating device |
| CN109281973B (en) * | 2018-10-26 | 2021-04-16 | 株洲时代新材料科技股份有限公司 | Frequency-adjustable rubber dynamic vibration absorber and natural frequency adjusting method thereof |
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