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CN-121990198-A - Vibration damper for unmanned aerial vehicle

CN121990198ACN 121990198 ACN121990198 ACN 121990198ACN-121990198-A

Abstract

The invention discloses a vibration damper for an unmanned aerial vehicle, which comprises an unmanned aerial vehicle, wherein the unmanned aerial vehicle is connected with a base through a vibration damper, the vibration damper comprises a cross-shaped upper plate and an annular lower plate, and elastic pieces are distributed between the cross-shaped upper plate and the annular lower plate at equal angles. The vibration performance of the unmanned aerial vehicle is greatly improved by adopting a steel wire rope compression vibration reduction design, effectively attenuating multidirectional and broadband vibration, particularly a medium-high frequency range, and the vibration isolation efficiency is far superior to that of a conventional platform, ensuring equipment stability in a complex flight environment, being strong in universality, wide in adaptation, modularized and adjustable in structure, flexibly matching equipment with different weights and sizes, not needing customization, remarkably reducing the use and replacement cost, being suitable for various scenes such as reconnaissance, mapping, logistics, low-altitude operation and the like, being light in weight, high in durability and heavy in weight, adopting a light high-strength material (such as magnesium alloy) and optimizing a hollow structure, reducing load, maintaining the endurance and the flight performance of the unmanned aerial vehicle, and being high in structural strength and being prolonged by more than twice in service life.

Inventors

  • WU YAOZHONG
  • MO WENXIN
  • Cui Yuding
  • WANG QIQIANG
  • WEI DONG
  • WANG HUAWEI

Assignees

  • 武汉科技大学

Dates

Publication Date
20260508
Application Date
20260403

Claims (7)

  1. 1. The vibration damper for the unmanned aerial vehicle comprises the unmanned aerial vehicle (1), wherein the unmanned aerial vehicle (1) is connected with a base (3) through a vibration damper (2), and is characterized in that the vibration damper (2) comprises a cross-shaped upper plate (21) and an annular lower plate (22), elastic pieces are distributed between the cross-shaped upper plate (21) and the annular lower plate (22) at equal angles, the annular lower plate (22) is connected with the unmanned aerial vehicle (1) through a first connecting structure, and the cross-shaped upper plate (21) is connected with the base (3) through a second connecting structure; Simplifying the movement of the elastic member into a single degree-of-freedom spring-mass-damping system whose basic vibration is simple harmonic vibration And if the vibration displacement of the mass body is x, the kinetic equation of the mass body m is as follows: Equation 1: ; let the special solution of equation 1 be: Equation 2: ; Substituting equation 2 into equation 1 yields a displacement transmissibility T r of: ; Wherein T r is the absolute transfer rate of displacement, B is the response amplitude of system displacement, A is the excitation amplitude of system input displacement, lambda is the system frequency ratio, ; K is an elastic coefficient, m is a mass, and ζ is a system damping ratio; And c is a system damping coefficient.
  2. 2. The vibration damper for unmanned aerial vehicle according to claim 1, wherein the elastic member is a wire rope damper and is a 304 stainless steel wire rope, and is a profiled structure woven into a plurality of turns.
  3. 3. The vibration damper for the unmanned aerial vehicle according to claim 2, wherein the first connecting structure comprises a lower plate upright post (24), and both ends of the lower plate upright post (24) are respectively connected with the annular lower plate (22) and the unmanned aerial vehicle (1) through connecting pieces.
  4. 4. A vibration damper for an unmanned aerial vehicle according to claim 3, wherein the second connecting structure comprises an upper plate column (23), and both ends of the upper plate column (23) are respectively connected with the cross-shaped upper plate (21) and the base (3) through connecting pieces.
  5. 5. The vibration damper for unmanned aerial vehicle according to claim 4, wherein the connecting member comprises a bolt (26), and an elastic washer (27) and a flat washer (28) are provided on the bolt (26), respectively.
  6. 6. The vibration damper for the unmanned aerial vehicle according to claim 4, wherein a rubber gasket is arranged at the joint of the steel wire rope vibration damper (25) with the cross-shaped upper plate (21) and the annular lower plate (22).
  7. 7. The vibration damper for unmanned aerial vehicle according to claim 4, wherein the surfaces of the cross-shaped upper plate (21) and the annular lower plate (22) are anodized.

Description

Vibration damper for unmanned aerial vehicle Technical Field The invention relates to the technical field of unmanned aerial vehicles, in particular to a vibration damper for an unmanned aerial vehicle. Background With the rapid development of unmanned aerial vehicle technology, the unmanned aerial vehicle is widely applied to the military reconnaissance, civil mapping, logistics transportation, low-altitude operation and other military and civil fields, and is even regarded as the core development direction of a new generation of low-altitude vehicles. Under the background, people put forward more stringent requirements on the comprehensive quality of the unmanned aerial vehicle, not only have enough structural strength to adapt to complex flight environment, but also have excellent dynamics quality to ensure the operation stability and safety. However, the problem of vibration of unmanned aerial vehicles in actual flight is always a key bottleneck restricting performance improvement. On one hand, for a certain type of unmanned aerial vehicle for oil-electricity mixed use, the vibration amplitude of an engine is larger, and the problem that the vibration reduction effect is poor is generally existed in a vibration absorber adopted at the joint of the existing engine and a machine body, so that vibration is directly transmitted to the machine body, the normal operation of carrying load equipment is seriously affected, the operation precision is greatly reduced, on the other hand, for a manned multi-rotor unmanned aerial vehicle, the vibration not only can affect the control stability and riding comfort of a pilot, but also can cause a series of potential safety hazards, such as failure of a magnetic compass, fatigue fracture at the joint of the structure, loosening of a fastener and the like, and in extreme cases, the unmanned aerial vehicle is directly caused to be out of control, so that the life safety of passengers is seriously threatened. At present, most of common vibration reduction devices in the unmanned plane field are of suspension type structures, and the structures have obvious defects in practical application, namely, firstly, the vibration reduction direction is single, the multi-directional vibration suitability to parts such as an engine is poor, the vibration reduction efficiency is limited, secondly, the effective protection design is lacking, when the device is subjected to fatigue damage due to long-term vibration, the device is extremely easy to fall off, and then secondary accidents such as machine body structure damage or load equipment fall are caused. More importantly, the traditional suspension type vibration damper is difficult to consider the vibration damping effect and the structural stability, and cannot meet the requirement of the current unmanned aerial vehicle on a high-quality vibration damping scheme. Therefore, developing an unmanned aerial vehicle vibration damper with stronger suitability and higher safety has become a technical problem to be solved in industry. The vibration damping device provided by the application has two main advantages, namely, the design thought of traditional suspension type vibration damping is broken through, the suspension type device is converted into the compression type vibration damping device, the vibration damping effect is realized through compression deformation, the adaptation range is wider, multidirectional vibration can be effectively counteracted, the vibration damping effect on broadband vibration of an engine is remarkably improved, the special limiting function is integrated, even if the device is damaged in long-term use, the limiting structure can firmly support key parts, the whole device is prevented from falling, the secondary potential safety hazard caused by failure of the vibration damping device is fundamentally stopped, and double guarantee is provided for stable flight and safe operation of an unmanned aerial vehicle. Disclosure of Invention The application aims to overcome the defects of poor vibration damping suitability, no protection and easy falling of the existing unmanned aerial vehicle suspension type vibration damping device and provide the unmanned aerial vehicle vibration damping device with excellent vibration damping effect and high safety. In order to achieve the above purpose, the present invention adopts the following technical scheme: The vibration damper for the unmanned aerial vehicle comprises the unmanned aerial vehicle, wherein the unmanned aerial vehicle is connected with a base through a vibration damper, the vibration damper comprises a cross-shaped upper plate and an annular lower plate, elastic pieces are distributed between the cross-shaped upper plate and the annular lower plate at equal angles, the annular lower plate is connected with the unmanned aerial vehicle through a first connecting structure, and the cross-shaped upper plate is connected with the base through a second connecti