发明名称 |
TECHNIQUE FOR COMPUTING A MEASURE ON AN ULTRASONIC SIGNAL HAVING APPLICATION TO IDENTIFY VALVE DEFECTS IN OPERATING ENGINES. |
摘要 |
A measurement technique that generates a number value identifying the width of a noisy pulse in an analog signal that has particular application for determining whether a defect exists in a cylinder valve of a locomotive diesel engine. The algorithm samples the analog signal, and then the samples are bunched into successive groups where each group includes a predetermined number of samples. A root mean square is taken of the samples in each group to generate a representative amplitude value for that group. Successive amplitude values are multiplied together to generate product values. The product values are averaged over a predetermined number of product values to generate the number value that can be analyzed to determine if a defect in a valve exists.
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申请公布号 |
MXPA03001370(A) |
申请公布日期 |
2005.02.14 |
申请号 |
MX2003PA01370 |
申请日期 |
2003.02.14 |
申请人 |
GENERAL MOTORS CORPORATION |
发明人 |
POLEN, JERRY, VAN |
分类号 |
G01M15/12;(IPC1-7):G01H00/00 |
主分类号 |
G01M15/12 |
代理机构 |
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地址 |
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