Design And Development Of Vibration And Noise Test Platform For Internal Combustion Engine

With the progress of the times and the development of science and technology,the emergence of internal combustion engines has brought productivity to a new level.Nowadays,with the widespread application of internal combustion engines,human requirements for their safety and performance are constantly improving.At present,internal combustion engines are developing in the direction of greater power,faster speed,less vibration and noise,and safer operation.Considering that the vibration response of internal combustion engine has a large proportion in vibration reduction and noise reduction of internal combustion engine,and improving the safety of using internal combustion engine,it is necessary to design and develop a set of vibration and noise testing system of internal combustion engine for enterprises.First of all,In this paper,the embedded controller NI-c RIO-9041 of NI Company of America is selected,and the software and hardware platform for vibration and noise test of internal combustion engine is designed and developed,which has been put into use.Secondly,the software platform of vibration and noise of internal combustion engine is designed through RT and FPGA modules in Lab VIEW,including the design and development of lower computer and upper computer.The lower computer mainly includes data collection,calculation and conversion of various variables,and wireless transmission of data(through UDP protocol);The upper computer mainly includes sensor calibration,channel selection when displaying different data,data receiving calibration and real-time display refresh,data storage and playback functions,and data analysis functions in frequency domain and time-frequency domain.Through the field data collection and analysis,the platform is accurate,stable and meets the industrial requirements for long-time data collection and display,and has been put into use.Then,this paper relies on the SC10E350Q4 internal combustion engine of Shanghai Diesel Engine Co.,Ltd.to study and analyze it in time domain,frequency domain and time-frequency domain through the project design platform.The results show that with the continuous increase of speed,the vibration at the test and evaluation point outside the internal combustion engine will gradually increase;The energy in the collected signal is mainly concentrated in the low frequency band.Then,through the study of the order of the internal combustion engine,the signals collected at each test point have significant regularity,and the amplitude of vibration acceleration is most obvious at even order.The real-time experimental results show that the system is reliable,safe and practical.Last,the reliability of internal combustion engine is studied by using Weibull distribution function.Considering that the third stage of Weibull is the loss failure period,and the problems mainly appear in aging,fatigue and wear,in order to establish the model accurately,the Weibull model is established by capturing the damage data of various parts of internal combustion engine through equipment,and its parameters are estimated by using the least square linear regression method,the failure rate curve of internal combustion engine data is given,and the probability distribution of remaining life of internal combustion engine is obtained.