發(fā)布時(shí)間：2018-12-07 21:22

【摘要】：噪聲是由物體振動(dòng)產(chǎn)生的對(duì)人造成干擾的聲音。窄帶主動(dòng)噪聲控制(Active Noise Control-ANC)系統(tǒng)針對(duì)能量集中在有限個(gè)頻率的窄帶噪聲進(jìn)行主動(dòng)控制降噪。當(dāng)采用非聲學(xué)傳感器獲取參考信號(hào)時(shí),窄帶ANC系統(tǒng)中往往存在頻率不匹配(Frequency Mismatch-FM),極大削弱系統(tǒng)的降噪性能。此外,初級(jí)噪聲信號(hào)頻率發(fā)生跳變,即非平穩(wěn)也是存在于系統(tǒng)中的另一問題。本文分別從理論仿真和硬件實(shí)現(xiàn)對(duì)窄帶ANC進(jìn)行研究。首先,在理論仿真部分,利用MATLAB/Simulink的實(shí)時(shí)仿真功能,構(gòu)建了針對(duì)前饋窄帶ANC系統(tǒng)的實(shí)時(shí)仿真平臺(tái)。對(duì)傳統(tǒng)窄帶ANC控制系統(tǒng)進(jìn)行噪聲抑制仿真分析,包括系統(tǒng)存在FM時(shí)系統(tǒng)的性能評(píng)價(jià)。針對(duì)FM問題對(duì)傳統(tǒng)FM補(bǔ)償方法以及一種改進(jìn)的FM補(bǔ)償方法進(jìn)行了實(shí)時(shí)仿真并進(jìn)行了性能比較。進(jìn)一步,在FM補(bǔ)償系統(tǒng)中引入了非平穩(wěn)的情況,對(duì)兩種FM補(bǔ)償方法進(jìn)行了比較,對(duì)其性能進(jìn)行評(píng)估。其次,對(duì)窄帶ANC系統(tǒng)進(jìn)行硬件實(shí)現(xiàn)設(shè)計(jì)。在實(shí)時(shí)仿真的基礎(chǔ)上,設(shè)計(jì)基于高速浮點(diǎn)型C6000系列DSP芯片的窄帶主動(dòng)噪聲控制器,以一維管道為實(shí)驗(yàn)平臺(tái),實(shí)現(xiàn)對(duì)初級(jí)和次級(jí)噪聲信號(hào)的采集轉(zhuǎn)換、次級(jí)通道辨識(shí)、相關(guān)ANC算法的處理,使次級(jí)噪聲信號(hào)與初級(jí)噪聲信號(hào)相消干涉,實(shí)現(xiàn)降噪目的。分別對(duì)傳統(tǒng)窄帶前饋ANC系統(tǒng)及基于自回歸(Auto Regressive-AR)模型的頻率補(bǔ)償系統(tǒng)進(jìn)行實(shí)驗(yàn),驗(yàn)證了兩種系統(tǒng)的有效降噪性。
[Abstract]:Noise is the noise produced by the vibration of an object that interferes with human beings. The narrow band active noise control (Active Noise Control-ANC) system is used to reduce the noise of narrow band noise which is concentrated on a limited frequency. When the reference signal is obtained by the non-acoustic sensor, the frequency mismatch (Frequency Mismatch-FM) often exists in the narrowband ANC system, which greatly weakens the noise reduction performance of the system. In addition, the frequency jump of the primary noise signal, that is, non-stationary, is another problem in the system. In this paper, narrowband ANC is studied by theoretical simulation and hardware implementation. Firstly, in the theoretical simulation part, a real-time simulation platform for feedforward narrowband ANC system is constructed by using the real-time simulation function of MATLAB/Simulink. The noise suppression simulation of the traditional narrow band ANC control system is carried out, including the performance evaluation of the system with FM. Aiming at the FM problem, the traditional FM compensation method and an improved FM compensation method are simulated in real time and the performance is compared. Furthermore, the non-stationary condition is introduced into the FM compensation system. The performance of the two FM compensation methods is compared and evaluated. Secondly, the hardware implementation of narrowband ANC system is designed. On the basis of real-time simulation, a narrow band active noise controller based on high-speed floating-point C6000 series DSP chips is designed. The acquisition and conversion of primary and secondary noise signals and secondary channel identification are realized by using one-dimensional pipeline as experimental platform. The processing of correlation ANC algorithm eliminates the interference between the secondary noise signal and the primary noise signal and realizes the purpose of noise reduction. Experiments on the traditional narrowband feedforward ANC system and the frequency compensation system based on autoregressive (Auto Regressive-AR) model are carried out to verify the effective noise reduction of the two systems.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB535

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本文編號(hào)：2367895