A hydraulic dynamic anti-resonance vibration isolator with adjustable anti-resonance frequency

Abstract

A hydraulic power anti-resonance vibration isolator having an adjustable anti-resonance frequency, said vibration isolator comprising an outer cylinder (4), an inner cylinder (2), an elastic thin film assembly (8) and a frequency modulation counterweight (9), one end of the outer cylinder (4) being sealed and connected to a vibration source, the inner cylinder (2) being arranged within the outer cylinder (4), rubber (3) being arranged between the inner cylinder (2) and the outer cylinder (4), the rubber (3) being adhered to an inner cylinder outer wall and an outer cylinder inner wall, the end of the inner cylinder (2) away from the vibration source being sealed and connected to a fixing mechanism, the elastic thin film assembly (8) forming an end surface which seals the inner cylinder (2), the end surface and the sealed end of the outer cylinder (4) together forming an accommodating cavity used for accommodating a fluid, the frequency modulation counterweight (9) being connected to the surface of the elastic thin film assembly (8) away from the accommodating cavity. The vibration isolator can adjust the anti-resonance frequency by altering the mass of the frequency modulation counterweight, so as to adapt to rotor vibration load frequency fluctuations, thereby overcoming the defect that traditional power vibration absorption frequencies are highly selective.

Description

technical field [0001] The application belongs to the technical field of vibration reduction design, and in particular relates to a hydraulic dynamic anti-resonance vibration isolator with adjustable anti-resonance frequency. Background technique [0002] During the flight of the helicopter, the rotor is subjected to aerodynamic load to form a rotor vibration load with frequency f=NΩ, where N is the number of rotor blades, and Ω is the rotor speed. The rotor vibration load 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 vibration isolation design for the main reducer installation structure is to block the rotor vibration load with frequency f=NΩ from being transmitted to the body, thereby reducing the vibration level of the helicopter body. [0003] In order to ensure...

AI Technical Summary

Problems solved by technology

This patent uses a high-density, low-viscosity fluid for pressure transmission and frequency modulation. However, it is difficult to obtain a non-toxic, non-corrosive, high-density, low-viscosity fluid in engineering practice, and the structure of the vibration isolator involved in this patent once Determined, the anti-resonance frequency cannot be adjusted, and the dynamic anti-resonance vibration isolation cannot be effectively implemented when the external excitation frequency fluctuates

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