Study on Dual-DSP-Based Testing System of Noise Environment Simulation
MA Ming1，2,SHEN Run-jie1,FANG Bing2, HE Wen1
 (1 State Key Laboratory of Fluid Power Transmission and Control，Zhejiang Province Key Laboratory of Advanced Manufacturing Technology，Institute of Manufacturing Engineering，Zhejiang University， Hangzhou ,310027, China;2 College of Electrical Engineering, Zhejiang University, Hangzhou, 310027, China）
Abstract: Considering the generated requirements of noise environment in a complex multi-parameter test system, a dual-core DSP control structure of noise simulation system was presented. The system communicated with PC by the asynchronous serial and transmitted data or  commands from DSP1 to DSP2 by the synchronization serial. After the theory of fuzzy PID algorithm was deeply analyzed and researched, the noise signal was controlled in frequency domain, so that the closed-loop automatic control of noise simulation system was realized. The results of experiments show that the pressure level of sound spectrum fluctuated much greatly before it was controlled, and the scope of fluctuation reached as much as 50dB, and also the mean sound pressure level ，which the fequency was above 4kHz, was somewhat inclined. On the contrary, the extent of fluctuation in the pressure level of sound spectrum could be controlled within 10 dB. The mean sound pressure level was also relatively straight. All these things above can prove that the control method is available and much effective.
Key Words: white noise control；DDS；DSP；fuzzy PID