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Car electronic horn as one of the auto loading essential parts , its performance directly affects the safety of traffic operations and control of noise pollution . Effective and rapid detection of car electronic horn , to begin developing a comprehensive performance test systems for automotive electronics horn . As a convenient mobile system design standard environment anechoic chamber , narrow simplify a small sound level test box . Since the detection accuracy of the sound level test box directly affect the use of the entire system , the test box , the sound level simulation and design of major significance . Firstly, analyzed and summarized existing sound level test box , changes of the internal structure and sound level acquisition algorithm to improve test accuracy . Establish sound level box after using the finite element analysis software ANSYS finite element model , the internal space is set to the ideal gas , the tank shell is set to the boundary conditions , which also added to the model of the sound-absorbing material , will be tested electronic speaker simulation for a point source , simulation of the sound field distribution inside the box . Next, some of the factors that may affect the sound level inside the test chamber sound field distribution , change the model parameters by some comparative experiments , such as the shape of the box , the size of the absorption coefficient of sound-absorbing material , electronic horn sound level box the position of the electronic horn sound pressure level and frequency of the sound , the sound field distribution inside the box , and the initial improvement of the sound level test box . Finally , some simulation results and the use of existing systems measured data on the MATLAB platform , verify that the sound level of the theory - distance conversion relationship and take advantage of the difference between the test data correction
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