Six-degree of freedom vibration absolute measuring method based on triaxial acceleration sensor array

Abstract

The invention discloses a six-degree of freedom vibration absolute measuring method based on a triaxial acceleration sensor array, which comprises the following steps of: establishing a sensor array comprising four capacitive triaxial acceleration sensors, directly measuring the three-dimensional acceleration of a measured object at different positions in different directions, and then calculating the three-dimensional linear velocity of the measured object. In the invention, the coordinate of the ground is regarded as a reference, and the sensors are not in direct connection with the reference body, so that the measurement is an absolute measurement; a six-dimensional vibration parameter is obtained by calculating the measured vibration acceleration of a moving body so as to realize a six-degree of freedom compound vibration absolute measurement; and the method has the characteristics of low cost, large dynamic range, fast response, long service life and high reliability. The method disclosed by the invention is suitable for the six-degree of freedom vibration absolute measurement of moving bodies, such as vehicles, ships, airplanes, and the like, which have very complex vibrations in six directions of degree of freedom.

Description

technical field [0001] The invention belongs to the field of vibration measurement, in particular to a six-degree-of-freedom vibration absolute test method based on a three-axis acceleration sensor array. Background technique [0002] With the advancement of science and technology, the vibration of moving bodies such as vehicles, ships, and airplanes has drawn more and more attention. Such as the demand for vibration excitation spectrum in the design of machine (vehicle) equipment. This type of moving body has a large degree of freedom of movement and a wide dynamic range. It vibrates in six directions of freedom, and the vibration state is very complicated. The above characteristics put forward higher requirements for the corresponding testing technology. Therefore, the existing test means has the following problems relative to the above-mentioned moving body: [0003] ①Because the target object of the test moves in a large range, it is difficult to connect the sensor to ...

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Problems solved by technology

[0003] ①Because the target object of the test moves in a large range, it is difficult to connect the sensor to the target object and the static reference body at the same time, so it is impossible to perform a relative test, and only an absolute test method can be used;

[0004] ② The characteristics of many vibration degrees of freedom determine that the single-dimensional vibration test method cannot be used, and only the multi-dimensional test method can be used

In practical applications, multiple installation errors are introduced, which makes the system’s requirements for space too strict and increases the amount of calculation. The specific performance is that the orthogonality is difficult to guarantee, and each sensor will introduce errors in the installation position and direction. , the calculation and accumulation will have a great impact on the final result; when the measurement space is narrow, since each single-axis sensor occupies a certain volume, the installation positions will interfere with each other, and even the test task cannot be completed; the structure is complex, because it is impossible to The single-axis sensors on the same coordinate axis are installed at one point, and position variables equal to the number of sensors are introduced. When using the integral algorithm to solve the angular velocity, too many position variables will gradually increase the trend item, which will have a great impact on the test effect. influences

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