| Dynamic measurement and signal analysis are becoming more and more important in the field of aircraft, spacecraft, communication and mechanical. With the development of software technique in test and fault diagnosis field, it is a new trend that the virtual instrument is used in dynamic signal testing. So the system is studied by using the software, Labview, and the hardware including PC, DAQ, sensor and amplifier. The computer controls the data output and acquisition, signal processing and etc, which can meet the need of dynamic measurement.First, simple introduction on virtual instrument and Labview is made in the thesis. Second, the function and the usage of every module are studied in detail as the sequence of the signal generation, data acquisition and signal processing. Then the data of beam is recorded in vibration, which verifies the function of the dynamic testing and measure the natural frequency by pulse test. Based on the data, make the shape of vibration. Last, the ratio of damp is measured by sine test.The result of experiment prove the practicability and accuracy of the system, which is easy to be developed by engineer for the good expansibility and high price performance ratio. |
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