Active Noise Control of the Heavy Truck Interior Cab

Abstract：In order to control the noise of the heavy truck interior cab effectively， the active noise contro1 methods are employed．First，an interior noise field test for the heavy truck is performed，and frequencies of interior noise of this vehicle are analyzed．According to the spectrum analysis of acquired noise signal，it is found out that the main frequencies of interior noise are 1ess than 800Hz．Then the least squares lattice(LSL) algorithm is used as signal processing algorithm of the controller and a closed—lop control DSP system，based on TMS 320VC5416，is developed．The residual signal at driver’s ear is used as feedback signa1．Lastly，the developed ANC system is loaded into the heavy truck cab，and controlling the noise at driver’s ear for that truck at different driving speeds is attempted．The noise control test results indicate that the cab interior noise is reduced averagely by 0．9 dBA at different driving speeds．