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CN-224214628-U - Dual-ring-shaped shock absorber based on variable rigidity, shock absorption platform system and cantilever beam structure system

CN224214628UCN 224214628 UCN224214628 UCN 224214628UCN-224214628-U

Abstract

A dual-ring-shaped shock absorber based on variable rigidity, a shock absorption platform system and a cantilever beam structure system relate to the field of vibration control and structural dynamics. The technical scheme includes that the upper annular structure and the lower annular structure are arranged opposite to each other and are rotatably connected through connecting members, the upper annular structure and the lower annular structure comprise two cross beams which are arranged in parallel and two semi-elliptical sheets which are symmetrically arranged at two ends of the cross beams, the connecting members are used for realizing rotation of the upper annular structure relative to the lower annular structure within a preset angle range, and the contact rigidity between the upper annular structure and the lower annular structure is changed along with the change of the relative rotation angle of the upper annular structure and the lower annular structure. The vibration damping device is suitable for working scenes such as a precision platform, a cantilever structure or an electronic equipment mounting base which need to realize passive and self-adaptive vibration damping in a 40 Hz-100 Hz medium-high frequency vibration environment.

Inventors

  • YANG TIANZHI
  • JIN YANG

Assignees

  • 苏州定瓴科技有限公司

Dates

Publication Date
20260508
Application Date
20250609

Claims (10)

  1. 1. A dual annular damper based on variable stiffness, comprising: An upper annular structure and a lower annular structure, the upper annular structure being disposed opposite to the lower annular structure and rotatably connected by a connecting member; The upper annular structure and the lower annular structure comprise two cross beams which are arranged in parallel and two semi-elliptical sheet bodies which are symmetrically arranged at two ends of the cross beams to form a closed structure; the center of the cross beam of the upper annular structure and the center of the cross beam of the lower annular structure are provided with aligned screw holes, and the connecting member penetrates through the screw holes and is used for realizing the rotation of the upper annular structure relative to the lower annular structure within a preset angle range; The contact stiffness between the upper annular structure and the lower annular structure changes with the change of the relative rotation angle.
  2. 2. A dual annular damper based on variable stiffness as claimed in claim 1 wherein the upper and lower annular structures are identical in construction.
  3. 3. The variable stiffness based dual annular shock absorber of claim 1 wherein said cross beam is a rectangular plate-like structure.
  4. 4. A variable stiffness dual annular shock absorber according to claim 1 wherein the upper annular structure and the lower annular structure are rotated relative to each other through an angle in the range of 0 ° to 90 °.
  5. 5. A variable stiffness dual annular shock absorber according to claim 1 wherein the two semi-elliptical sheets have a major axis of 20mm and a minor axis of 15 mm.
  6. 6. The dual annular damper of claim 1, wherein the cross member and semi-elliptical sheet are integrally formed and manufactured by a 3D printing process.
  7. 7. The variable stiffness based dual annular shock absorber of claim 6 wherein the 3D printing process uses PLA material with a print fill rate of 15%.
  8. 8. The variable stiffness dual annular shock absorber of claim 7 wherein said connecting member is a metal bolt having a gauge M5.
  9. 9. A shock absorbing platform system comprising a load carrying platform, a support base and the shock absorber of claim 1 disposed therebetween.
  10. 10. A cantilever beam structural system comprising a cantilever beam and the shock absorber of claim 1 mounted below its free end.

Description

Dual-ring-shaped shock absorber based on variable rigidity, shock absorption platform system and cantilever beam structure system Technical Field Relates to the field of vibration control and structural dynamics, in particular to a double-ring-shaped passive vibration damper capable of realizing rigidity adjustment based on structural geometric characteristics. Background Vibration control techniques are of great importance in modern industrial equipment, precision platforms and electronics applications. Long-term exposure to vibratory environments can not only reduce the service life and measurement accuracy of the device, but can also cause structural fatigue failure. Therefore, vibration suppression means are continuously developed, and mainly comprise three major categories of passive vibration reduction, active vibration reduction and semi-active vibration reduction. Among them, the passive vibration damper is widely used in engineering applications, such as rubber pads, spring-damping systems, vibration isolation seats, etc., due to its simple structure, good stability and low cost. The vibration damper realizes vibration attenuation of a specific frequency band by depending on fixed structural parameters, but once the rigidity is determined, the vibration damper cannot be dynamically adjusted, and is easy to generate resonance phenomenon when facing multiple frequencies or changing working conditions, and cannot maintain good performance. In contrast, the active vibration damper collects vibration signals through the sensor, and the force input of the actuator is adjusted in real time through the control system, so that the purpose of dynamic vibration suppression is achieved. For example, in high-precision platforms and aerospace structures, excellent low-frequency vibration control can be achieved by adopting an active magnetic suspension vibration isolation device. However, the active system generally has the disadvantages of complex structure, high power consumption, high cost, poor system robustness and the like. In recent years, semi-active vibration damping technology has been developed, and the advantages of both passive and active systems are considered to a certain extent by adjusting the stiffness or damping parameters inside the device. Such as magnetorheological dampers, piezoelectrically tuned mass dampers, etc., can achieve a limited range of parameter adjustments to account for external excitation variations. However, these systems still generally rely on an electrical control loop or complex feedback logic, and the manufacturing cost and control difficulty remain high. In the pursuit of vibration damping devices that do not require external energy, are low-cost and self-adaptive, some studies are beginning to focus on the mechanism of performance regulation due to the morphological changes of the structure itself. Passive adjustability of stiffness or damping is achieved, for example, by designing deformable units or composite structures. However, the existing structure is concentrated on a low-frequency buffer scene, the passive stiffness adjusting mechanism which effectively works in a medium-high frequency (40 Hz-100 Hz) range is still less, the adjusting range is limited, the response capability is weak, and the vibration reduction requirement in the actual engineering is difficult to meet. In summary, the prior art has the defect that the effective and continuous rigidity adjustment and vibration suppression in the medium-high frequency range cannot be realized by utilizing the structural geometric change on the premise of not needing external energy and a control system. Disclosure of utility model In order to solve the defect that the prior art cannot realize effective and continuous rigidity adjustment and vibration suppression in a medium-high frequency range by utilizing structural geometric change on the premise of no need of external energy and a control system, the utility model provides the following technical scheme: a dual annular damper based on variable stiffness comprising: An upper annular structure and a lower annular structure, the upper annular structure being disposed opposite to the lower annular structure and rotatably connected by a connecting member; The upper annular structure and the lower annular structure comprise two cross beams which are arranged in parallel and two semi-elliptical sheet bodies which are symmetrically arranged at two ends of the cross beams to form a closed structure; the center of the cross beam of the upper annular structure and the center of the cross beam of the lower annular structure are provided with aligned screw holes, and the connecting member penetrates through the screw holes and is used for realizing the rotation of the upper annular structure relative to the lower annular structure within a preset angle range; The contact stiffness between the upper annular structure and the lower annular structure changes with the chan