Magnetic flowing deformation elastomer frequency shift type attenuator and control method

A magnetorheological elastomer and vibration absorber technology, which is applied in vibration suppression adjustment, non-rotational vibration suppression, etc., can solve the problems of narrow control frequency band, insignificant influence of vibration absorber characteristics, and high energy consumption, etc., to achieve vibration reduction frequency The effect of large bandwidth, easy control method, small mass and volume

Inactive Publication Date: 2009-07-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional passive vibration absorber has many shortcomings, such as the control frequency band is very narrow and cannot be adjusted, so it can only reduce the vibration of a steady-state vibration with a fixed excitation frequency. When the excitation frequency deviates a little, the vibration reduction effect will be sharp deteriorating, or even worse
And increasing the bandwidth will make it unwieldy etc.
[0004] The vibration absorbing device mentioned in the invention patent of application number 96107066.8 is designed using the principle of a passive vibration absorber. Due to the narrow bandwidth of vibration reduction, it can only be solved by increasing the damping or the weight of the shock absorber and using multiple vibration reduction weights. , but increasing the damping will reduce the vibration damping effect, and increasing the mass and number of vibration damping weights will make the shock absorber bulky. In addition, this method has a very limited increase in the vibration damping bandwidth, generally only a few hertz
In addition, the invention patent with application number 02131043.2 mentions an active magneto-rheological fluid damping vibration absorber and its installation method, which can use linear motors, metal springs and magnetorheological fluid dampers to actively change parameters such as system control force and damping To achieve the purpose of "best tuning", but this control method is complicated, because it needs to drive the linear motor, it will consume more energy, and according to the principle of the vibration absorber, changing these parameters has no significant impact on the characteristics of the vibration absorber

Method used

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  • Magnetic flowing deformation elastomer frequency shift type attenuator and control method
  • Magnetic flowing deformation elastomer frequency shift type attenuator and control method
  • Magnetic flowing deformation elastomer frequency shift type attenuator and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one: if figure 1 , figure 2 The shown shear-type magnetorheological elastomer frequency-shifting vibration absorber is composed of inner sleeve 3 and outer sleeve 4, coil 5, magnetic isolation ring 6, magnetorheological elastomer 8, vibration-absorbing mass 1, base Seat 12 forms, and sleeve and base are made of pure electric iron, and the magnetic isolation ring is made of brass, and the vibration-absorbing mass block is also made of brass. The outer sleeve 4 is cylindrical, and the cross-sectional shape of its half is C-shaped, and the C-shaped opening faces inward, that is, there is a cavity inside the sleeve and an opening on the inner side wall. The coil 5 is just placed in the cavity, and the C-shaped opening on the inner side wall The opening is closed with an annular magnetic isolation ring 6, and the inner sleeve 3 is columnar or cylindrical (that is, there may be a longitudinal through hole or no longitudinal through hole at its axis), and the cros...

Embodiment 2

[0036] Embodiment two: if Figure 4 The tension-compression magnetorheological elastomer frequency-shifting vibration absorber shown is composed of a U-shaped iron core 2, a magnetorheological elastomer 8, an armature 9, a vibration-absorbing mass 1, a base 12 and a coil 5, wherein the U-shaped The iron core 2 and the armature 9 are made of industrial pure iron, the bottom of the U-shaped iron core is wound with a coil 5, and the upper part is horizontally placed with the armature 9, and the armature is strip-shaped. A sheet magnetorheological elastomer 8 is fixed between the armature 9 and the U-shaped iron core 2, and the vibration-absorbing mass 1 is fixed with threads on the armature 9, and the entire vibration absorber actuator 13 can be screwed through the bottom of the columnar iron core. The screw holes on the base 12 are fixed to the damping object, and other control methods are the same as in the first embodiment. It works in the state of tension and compression, wh...

Embodiment 3

[0037] Embodiment three: as Figure 5 The shown twist-bend composite magnetorheological elastomer frequency-shifting vibration absorber consists of an upper plate 10, a lower plate 11, a coil 5, a columnar iron core 7, a magnetorheological elastomer 8, a base 12 and a vibration-absorbing mass 1 Composition, the upper plate 10, the lower plate 11 and the columnar iron core 7 are made of industrial pure iron, the base 12 is made of aluminum, the columnar iron core 7 is wound around the coil 5, and the columnar iron core 7 is fixed on the upper plate 10 with threads up and down. and one end of the lower plate 11 or any part in the middle, and the remaining parts between the two plates are then fixed with a block-shaped magnetorheological elastomer 8, and the upper plate 10, the lower plate 11, and the magnetorheological elastomer 8 form a sandwich biscuit The sandwich beam is integrated and one end of it is welded and fixed on the base to form a cantilever beam. The other end of ...

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Abstract

A magneto-rheological elastomer frequency-shifting vibration absorber and its control method, the vibration absorber includes an execution part, a control part and a sensor, and is characterized in that its execution part is composed of a magnetic guide, a coil, a magneto-rheological elastomer and The vibration-absorbing mass block and the base are composed of; the magnetic-conducting part is composed of an inner sleeve and an outer sleeve, or a U-shaped iron core and an armature, or an upper plate, a lower plate and a cylindrical iron core. Magnetorheological elastomers are filled between the cylinders, between the U-shaped iron core and the armature, or between the upper and lower plates. By adjusting the corresponding voltage on the coil, the stiffness and elasticity of the magnetorheological elastomers are adjusted to change the vibration frequency. , until the vibration frequency of the actuator part of the vibration absorber is the same as that of the damping object. The invention has good vibration absorption effect, less energy consumption, wide frequency bandwidth of vibration reduction, small mass and volume, simple structure, easy control method, and multiple vibration absorbers can be used in combination according to the vibration reduction requirements of different frequency bands.

Description

(1) Technical field: [0001] The invention relates to a vibration damping device and a control method applied to machinery and electrical equipment. (two) background technology: [0002] In the past mechanical and electrical equipment, due to the lack of an effective shock absorption system, the mechanical and electrical equipment were damaged prematurely or caused noise pollution to the environment. [0003] Existing vibration control methods can be divided into active control, passive control, and semi-active control. Passive control has no adjustment ability at all, has its limitations, and is only suitable for narrow-band vibration control. Active control is superior to passive control and can be actively adjusted, suitable for broadband vibration control. However, active control belongs to force control, which needs to directly provide the energy of control force, and the cost is high and the technology is relatively complicated. Semi-active control belongs to paramet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F9/53
Inventor 邓华夏龚兴龙张先舟张培强
Owner UNIV OF SCI & TECH OF CHINA
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