Vehicle Noise And Vibration Test System Software Development And Application

Vehicle vibration, noise and harshness (NVH) is a major concern consumers buy anduse cars, and a set of easy-to-use, fully functional vehicle vibration noise test system is theprecondition of vehicle vibration noise control. This topic using Matlab powerful dataprocessing software designed and developed a set of perfect functions, friendly interfaceof automobile vibration and noise test and analysis software.Based on Matlab software development platform, combined with a dedicatedDT9837A acquisition card, computer, noise and vibration sensors and other hardware,consisting of portable vibration and noise test and analysis software. Users can modularoperation or based on the system design and development. Data acquisition module canset the sampling frequency, trigger mode, gain, sensor calibration. it’s can real-timedisplay of the data collected, data were collected with functions of data management,information can be set to save and import, thus reducing the operator’s workload,increased the accuracy of the parameter Settings, the last establish the file can storeacquisition all set information, convenient for the subsequent data analysis to check theinformation.Developed based on the theory of the FFT data analysis module, the module cansettings type of analysis, mean value, amplitude type, window function, window functioncorrection, overlapping rate and the frequency resolution parameters choice, which canrealize vibration and noise signal of FFT analysis, A, B, C weighted analysis,1/3octaveanalysis, order analysis functions, and the uniformity of the combustion engine based onthe theory of wavelet analysis functions integrated into the data analysis module.After real vehicle and engine bench test, Validate the system performance is stable,full-featured, simple operation, good expansibility and high cost performance, for thefuture production and fault diagnosis with advanced digital technology.