Method for testing transmission characteristics of tandem type vibration isolator

Abstract

The invention provides a method for testing transmission characteristics of a tandem type vibration isolation system. A test device for testing comprises a vibration excitation system, a test and monitoring system, a vibration isolation system and a vibration isolated system, and the vibration isolation system and the vibration isolated system are used for simulating the working states of vibration isolators under different helicopter types and different flight total weights. Through measurement of acceleration and force under fixed-frequency excitation, the force and displacement transmissibility of the tandem type vibration isolator under the working frequency can be further calculated, the change rule of the transmissibility of the tandem type vibration isolator along with the excitation frequency can be obtained through sweep frequency measurement, and then the effectiveness of the tandem type vibration isolator within the test frequency range is verified. The method can adapt to different working states of the vibration isolator, a test research method is provided for performance and characteristic research of the tandem type vibration isolator, support is provided for verifying feasibility and dynamic characteristics of the tandem type vibration isolator, and meanwhile great significance is achieved for vibration reduction design of the tandem type vibration isolator-mounted helicopter.

Description

technical field [0001] The invention belongs to the technical field of vibration control, and in particular relates to a method for measuring the transmission characteristics of a series vibration isolator. Background technique [0002] The basis of vibration isolation design is to study the transmission of vibration between objects. The vibration of the helicopter mainly comes from the periodic excitation of the rotor. The structure that bears the vibration is the body. While connecting the two parts of the rotor and the body, the main reduction mechanism not only transfers the static load, but also transmits the vibration to the body. The tandem vibration isolator is connected in series with the main reduction strut to reduce the exciting force transmitted from the rotor to the body, such as the liquid elastic vibration isolator. [0003] In order to verify the vibration isolation performance of the series vibration isolator, it is necessary to test the dynamic characteri...

AI Technical Summary

Problems solved by technology

The traditional way of thinking is through the dynamic stiffness test method. The dynamic stiffness method mainly fixes one end of the vibration isolator and applies an alternating dynamic force to the other end. Through the time domain response of the measured excitation force and displacement, the obtained The dynamic stiffness characteristics of the vibration isolator; although this method is relatively simple to implement, due to the high stiffness of the vibration isolator and the special requirements for the excitation frequency, higher requirements are placed on the output excitation force and measurement accuracy of the test equipment. It is not conducive to the rapid development of the test. At the same time, this method cannot directly measure the transfer characteristics of the series vibration isolation system, and can only indirectly reflect the transfer characteristics of the series vibration isolation system.

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