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Thin shell movable powder pellet solid engine modal parameter test method

A solid engine and modal parameter technology, which is applied in the direction of engine testing, machine/structural component testing, measuring devices, etc., can solve the problem of large dispersion of modal test functions, poor repeatability of test results, and unstable mode shapes of modal results and other problems, to achieve strong operability and practicability, solve the difficulty of determining the order of modal parameters, and reduce the effect of influence

Active Publication Date: 2017-01-18
TIANJIN AEROSPACE RELIA TECH +2
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Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned technical problems and provide a method for testing the modal parameters of a thin-shell movable grain solid motor, which is used to solve the modal parameters that occur during the test of the thin-shell movable grain tactical small solid motor. As a result, the mode shape is unstable, the modal test function has a large dispersion, and the modal parameters caused by the movable grain are affected by gravity. The test results have poor repeatability and other technical problems.

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  • Thin shell movable powder pellet solid engine modal parameter test method
  • Thin shell movable powder pellet solid engine modal parameter test method

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Embodiment Construction

[0021] Below, the substantive features and advantages of the present invention will be further described in conjunction with examples, but the present invention is not limited to the listed examples.

[0022] see figure 2 As shown, the modal parameter testing system of the thin-shell movable powder column tactical small solid motor of the present invention includes an excitation hammer 1, a data acquisition device 2, a modal analysis system 4, a test sensor 7, and a test line 8; the modal analysis system 4 is connected to the signal of the data acquisition device 2, the data acquisition device 2 is connected to the signal of the test sensor 7 through the test line 8, and the data acquisition device 2 is connected to the excitation hammer 1. The data acquisition equipment 2 and the modal analysis system 4 are installed on the instrument table 3, and the thin-shell active grain solid motor 5 to be tested is suspended in the air by a rubber rope 6.

[0023] The excitation hamme...

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Abstract

The invention provides a thin shell movable powder pellet solid engine modal parameter test method. The method comprises a step of using engine end part axial excitation, a step of uniformly distributing measuring points at an engine axial direction along a quadrant direction, a step of testing all transfer functions in one time, a step of using a least square frequency domain method to fit a modal parameter, and a step of judging a modal test correctness in the whole with the combination of vibration characteristics. According to the test method, the technical problems of difficult modal parameter rank determination, poor modal frequency repeatability and easy change of a vibration type in the modal parameter test of the thin shell movable powder pellet tactical solid motor are solved.

Description

technical field [0001] The invention belongs to the technical field of modal tests of solid motors, and in particular relates to a method for testing modal parameters of solid motors with thin-shell movable grains. Background technique [0002] Modal test is the main way to test the dynamic characteristics of test products. Usually, a certain excitation force is applied to the test piece, the response on the product is collected, and the dynamic characteristic parameters of the product can be obtained through the special modal parameter analysis software. However, when it comes to specific test pieces, the test methods are different. Thin-shell movable grain tactical small-sized solid motor is a new type of power plant for missile weapons, comprising a thin engine shell 16, in which the engine's front cover 9 to the engine's rear cover 13 are sequentially equipped with engine casting grains or Movable grain 10, engine grain joint 11, engine movable grain 12, engine nozzle ...

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Application Information

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IPC IPC(8): G01M15/00
CPCG01M15/00
Inventor 白西刚徐明鸽贺向清
Owner TIANJIN AEROSPACE RELIA TECH