727 A Research about noise analysis of a linear slider

Abstract

The scanning method of Acoustic Holography is used to identify the location of stationary sources. If measurement of unstationary sound source, it needs a lot of microphone. The method is microphone array method. However, this method is very expensive. This time, tried to measure the unstationary sound by devising the scanning method. In the experiment, using the linear slider for stepping motor. This motor will continue to reciprocate given interval. By applying to trigger function, it could be measured the sound pressure of moved the moment. Analysis of sound pressure used the Nearfield Acoustic Holography (NAH) Method. As a sound source localization method, the acoustic Intensity (AI) method is widely used. But the accuracy of NAH is better than that of AI method. As a result, a high frequency have been able to identify the location in the sound source, but a low frequency have not been able to identify the location.