| The virtual instrument (Ⅵ) technology has been widely used in measurement field since been developed. In overseas, theⅥhas many examples in control field, but in home, there are few. The research about applications ofⅥin control field is not comprehensive neither in overseas or in home. One of the key points of this article is the research ofⅥin semi-active vibration control system.First, this article analyzes the basic theory ofⅥand design of testing system and control systems. Then, on the study of mechanical arm, the dynamic testing system and semi-active vibration control system are established by using Lab VIEW platform, applying of PCI-6221 data logger board and signal disposal and other hardware.The testing system consists of sensors, appropriate adjuster, integral circuit, filter circuits and other hard wares. Designing the programs of data acquisition and preservation, data play-backing and pretreatment, time domain processing and frequency domain analysis completing vibration signals acquisition, display, storage, playback, time domain processing and Frequency Domain Analysis. Based on the mechanical arm of the dynamic testing experiment, the result is got the Lab VIEW test system for structural dynamic testing is feasible.In the experiment part, first, confirming the feasibility of the dynamic testing system designed on Lab VIEW platform by the hammer experiment. Second, applying the MR damper and its controller to mechanical arm system. Establishing the control system on Lab VIEW platform based on the Bang-Bang control and fuzzy control strategy. Collect the excitation signal and response signal in the hammer experiment and Analysis the amplitude frequency characteristics to study the control system, comparing amplitude-frequency characteristic curve and the peak value under different circumstances to get the conclusion: control system based on virtual instrument applied for the structure of semi-active damping control is effective and feasible. |
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