Eight-strut type multi-degree-of-freedom dynamic anti-resonance vibration isolation device

Abstract

The invention provides an eight-strut type multi-degree-of-freedom dynamic anti-resonance vibration isolation device which belongs to the field of helicopter vibration control. The device comprises aload platform, a foundation platform, a plurality of upper connecting blocks, a plurality of lower connecting blocks and eight strut assemblies. The upper connecting blocks are uniformly distributed on that same circumference of the low end face of the load platform; the lower connecting blocks are evenly distributed on the same circumference of the upper end face of the foundation platform; eachstrut assembly is composed of a liquid elastic vibration isolator, one end of which is connected with an upper connecting block and the other end of which is connected with a lower connecting block. The invention blocks the transmission of the multi-directional rotor hub force with the frequency f=N omega to the body through the dynamic anti-resonance effect of the liquid elastic vibration isolator, the vibration isolation frequency can be stabilized at f=N omega. In addition, the eight strut assemblies can realize redundant vibration control, so the vibration isolation device has certain anti-crash performance.

Description

technical field [0001] The invention relates to an eight-strut type multi-degree-of-freedom dynamic anti-resonance vibration isolation device, which belongs to the field of helicopter vibration control. Background technique [0002] During the flight of the helicopter, the rotor is subjected to aerodynamic loads to form a multi-directional rotor hub force with frequency f=NΩ, where N and Ω are the number of blades and the rotor speed, respectively. The rotor hub force is transmitted to the helicopter body through the rotor shaft, main reducer and main reducer installation structure, causing strong vibration of the body, affecting the combat effectiveness of weapons and equipment, and reducing ride comfort. The purpose of the vibration isolation design for the main reducer installation structure is to block the transmission of the multi-directional rotor hub force with frequency f=NΩ to the body, thereby reducing the vibration level of the helicopter body. [0003] In order ...

AI Technical Summary

Problems solved by technology

The liquid-elastic vibration isolator disclosed in patent 4236607 can effectively block the transmission of a single exciting force, but it cannot effectively block the transmission of multi-directional rotor hub force

On May 5, 2009, Chen Xiuxiang's application entitled "A Passive Vibration Isolation Device for Helicopter Main Gearbox" (public number CN101559833A) discloses a multi-degree-of-freedom passive vibration isolation device composed of four outrigger structures, which can isolate the main The multi-directional spatial excitation force received by the reduction box during operation, however, the structure of each leg is still designed based on the principle of spring damping vibration isolator, which cannot meet the special requirements of the vibration isolation design of the main reduction installation structure

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