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Solid rocket engine fault diagnosis method

A technology for solid rockets and fault diagnosis, which is applied in engine testing, machine/structural component testing, measuring devices, etc., and can solve problems such as single diagnostic method and inability to identify signal burst frequency points.

Inactive Publication Date: 2015-03-11
内蒙航天动力机械测试所
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Problems solved by technology

At present, the system for diagnosing engine faults through vibration parameter measurement is still in the stage of theoretical research and technical exploration, and the diagnostic method is single. As an important diagnostic method, frequency fault diagnosis cannot effectively distinguish the signal sudden frequency point

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specific example

[0013] A specific example of the present invention: a solid rocket motor fault diagnosis method.

[0014] Such as figure 1 As shown, the solid rocket motor fault diagnosis method mainly includes four parts: signal preprocessing, frequency domain processing, feature extraction, and fault decision-making.

[0015] Signal preprocessing mainly performs time-domain data processing on the original vibration data collected by the solid rocket motor ground test vehicle, mainly including data interception, zero line adjustment, trend extraction and elimination, and distortion elimination. The following describes the signal preprocessing process:

[0016] Step 1: Data interception

[0017] According to the effective length of the signal, intercept from the effective data of the engine vibration data. The length of the intercepted data is N, the starting point is k1, and the input parameter is the time range (t1, t2);

[0018] Step 2: Zero Line Adjustment

[0019] Averages the clipp...

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Abstract

The invention relates to a solid rocket engine fault diagnosis method, and particularly relates to application of vibration signal analysis and a constant fault alarm detection algorithm in solid rocket engine fault diagnosis. The fault diagnosis method is based on a vibration signal analysis technology, and the constant fault alarm detection algorithm is applied to the feature extraction process to perform state identification on specific frequency points on the basis of a frequency fault diagnosis method so that sudden frequency signals submerged in clutter energy spectrum can be effectively detected and accurate frequency information can be obtained. The solid rocket engine fault diagnosis method has important meaning on engine fault decision and provides reliable reference and support for engine design personnel and test personnel.

Description

technical field [0001] The invention relates to a solid rocket motor fault diagnosis method, in particular to the application of vibration signal analysis and constant false alarm detection algorithm in the solid rocket motor fault diagnosis. Background technique [0002] Ground test run of solid rocket motor is a complex system engineering, which has the characteristics of high risk, high cost, short test time and rapid failure. The vibration signal is one of the important parameters of the engine test run measurement, which can reflect the performance change of the engine faster than the steady-state parameters; the fault diagnosis mainly analyzes the failure mode of the solid rocket motor ground test data, and selects the appropriate algorithm. Carry out fault diagnosis on the engine and make accurate performance evaluation; constant false alarm detection is an effective signal analysis and identification algorithm, which has great advantages in the detection of frequency...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00
Inventor 张昱张磊云杰黄家骥潘炳建
Owner 内蒙航天动力机械测试所
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