Vibration transmission spectrum determination method of rocket sled test

Abstract

The present invention provides a vibration transmission spectrum determination method of a rocket sled test, belonging to the mechanical environment test technology field. The method comprises the following steps: (1) measuring the acceleration magnitude sequences aIx(k) and aIy(k) of a device X and a device Y through a sensor; (2) taking the aIx(k) and aIy(k) as an input quantity, and obtaining the vibration value sequences adx(k) and ady(k) after the high-pass filtering; (3) calculating the power spectrum density sequences [phi]x(fp) and [phi]y(fp) of the adx(k) and ady(k); (4) performing noise reduction processing of the power spectrum density sequences [phi]x(fp) and [phi]y(fp), and obtaining new power spectrum density sequences [phi]'x(fp) and [phi]'y(fp); and (5) calculating the vibration transmission spectrums. The vibration transmission spectrum determination method of the rocket sled test can directly obtain the high-frequency vibration information and effectively remove the noise so as to analyze the vibration transmission characteristics.

Description

technical field [0001] The invention relates to a method for determining the vibration transfer spectrum of a rocket sled test, which belongs to the technical field of mechanical environmental tests. Background technique [0002] The rocket sled is a sled that uses a rocket engine as a thrust to run at high speed on the track. Since the rocket sled can generate a large overload during operation, different types of products are installed on the sled to carry out the rocket sled test. [0003] During the rocket sled test, there are two installation methods for the tested product according to the test requirements. The first method is that the tested product is directly installed on the sled; the second method is that the tested product is installed on the vibration-damping plate, and the The vibrating plate is mounted on the skid through metal shock absorbers. The vibration and impact signals of the sled and the product under test (including the damping plate in the second m...

AI Technical Summary

Problems solved by technology

However, there is a lack of direct acquisition methods for high-frequency vibration information;

[0010] (2) Only periodic power spectrum analysis is carried out for vibration information at all levels, which is characterized by large noise and lack of effective noise reduction processing methods;

[0011] (3) It only qualitatively analyzes the magnitude of vibration at each level, whether there is a resonance peak, etc., and cannot analyze the vibration transfer characteristics from the skid to the vibration damping platform, from the vibration damping platform to the product under test, or from the skid to the product under test

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