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With the continuous development of the modern automobile industry , car noise has become a major component of the traffic noise and the urban environment noise , which makes the task becomes particularly important and urgent control of vehicle noise , and to control vehicle noise , the most important thing is to facilitate the quick to identify the main source of noise , so that it can prescribe the right medicine . Commonly used in automotive main noise source identification method of the measurement environment have higher requirements , and the measurement cycle is very long , measuring instruments , the price is quite high , so the development of a structure is simple , easy to operate , inexpensive test system of great significance and value in use . From sound basic theory and signal analysis and processing theory , the use of virtual instrument development platform , developed a set of simple structure , easy-to-use noise sound intensity measurement system, using sound intensity method to identify the main noise source of the car . The main work of the study are as follows: 1 ) the use of sound intensity probe , data acquisition card , signal conditioning equipment, and computer sound intensity measurement system hardware systems supporting the design ; 2 ) based on LabVIEW virtual instrument development platform , the development of a data acquisition module , open storage module , time domain analysis module , frequency domain analysis module , sound intensity calculation and spectral analysis module , 1/3 octave module , the results display module ; 3 ) a certain type of bus noise test object , noise measurement test , the measured data input to the data processing module has been the sound intensity three - dimensional diagrams and other sound intensity chart to identify the location of the main noise sources from the figure , the main noise source of the car in order to engine Mechanical noise , exhaust muffler noise and cooling fan noise , and so the corresponding improvements on several parts of the passenger and to achieve the desired noise reduction effect . The work done by the above is a useful exploration vehicle noise control , noise measurement of sound intensity measurement accumulated some practical experience , this will be the future in this regard further work to lay a good foundation .
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