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Active Cancelation of Acoustic Noise in Waveguides by Standard Control Task Decision Usage
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作者 Alexey A. Pudovkin 《Journal of Applied Mathematics and Physics》 2024年第4期1188-1202,共15页
Cybernetic decision variants were analyzed in order to use for physical task of active noise cancelation. 10 dB mean active noise cancellation is demonstrated in two decades frequency band by usage of cybernetic decis... Cybernetic decision variants were analyzed in order to use for physical task of active noise cancelation. 10 dB mean active noise cancellation is demonstrated in two decades frequency band by usage of cybernetic decision for acoustical duct physical scale model. The used decision was found on minimization of acoustical field power transfer function from the beginning of waveguide to their end. 展开更多
关键词 Waveguide noise active Cancelation control Synthesis Procedure H2
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Real-Time Detection of Unstable Control Loop Behavior in a Feedback Active Noise Cancellation System for In-Ear Headphones
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作者 Sven Hö ber +1 位作者 Christian Pape Eduard Reithmeier 《Engineering(科研)》 2015年第12期796-802,共7页
Active noise controls are used in a wide field of applications to cancel out unwanted surrounding noise. Control systems based on the feedback structure however have the disadvantage that they may become unstable duri... Active noise controls are used in a wide field of applications to cancel out unwanted surrounding noise. Control systems based on the feedback structure however have the disadvantage that they may become unstable during run-time due to changes in the control path—in this context including the listener’s ear. Especially when applied to active noise cancellation (ANC) headphones, the risk of instability is associated with the risk of harmful influence on the listener’s ear, which is exposed to the speaker in striking distance. This paper discusses several methods to enable the analysis of a feedback ANC system during run-time to immediately detect instability. Finally, a solution is proposed, which identifies the open loop behavior parametrically by means of an adaptive filter to subsequently evaluate the coefficients regarding stability. 展开更多
关键词 active noise control FEEDBACK Stability REAL-TIME Analysis
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低计算量的窄带ANC算法优化及实车DSP系统试验分析
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作者 卢炽华 王子嘉 +3 位作者 刘志恩 陈弯 周曾志 孙孟雷 《声学技术》 CSCD 北大核心 2024年第4期575-584,共10页
车内主动噪声控制中常使用的传统滤波-x最小均方(Filtered-x Least Mean Square,FxLMS)算法由于计算复杂度高,往往导致系统硬件算力不足,降噪效果不理想。文章提出一种基于改进局部次级通路建模方法的自适应陷波(Local-secondary-path F... 车内主动噪声控制中常使用的传统滤波-x最小均方(Filtered-x Least Mean Square,FxLMS)算法由于计算复杂度高,往往导致系统硬件算力不足,降噪效果不理想。文章提出一种基于改进局部次级通路建模方法的自适应陷波(Local-secondary-path Filtered-x Least Mean Square,LFxLMS)算法及其相应的窄带主动噪声控制(LFxLMS-based Narrowband Active Noise Control,LFx-NANC)系统。所提出的改进局部次级通路建模方法具有更高的建模精度,且该系统相较于传统系统大大降低了计算复杂度。通过基于Matlab软件的仿真分析,验证了该系统对稳态及非稳态多谐波噪声的降噪性能。基于ADSP-21489控制器搭建车内双通道LFx-NANC系统,实现了在稳态工况下主驾位置处二、四、六阶降噪量分别达到34.67、21.41、10.29 dB(A);在加速工况下主驾位置处总声压级和二阶降噪量分别达到6.01 dB(A)和20.40 dB(A),同时在其他位置均有较好的降噪效果。文中提出的方法为主动噪声控制的工程应用提供了参考。 展开更多
关键词 主动噪声控制 自适应陷波算法 局部次级通路 计算复杂度 ADSP-21489控制器
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针对频率失调问题的挖掘机ANC系统优化设计
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作者 袁守利 陈际 +1 位作者 刘志恩 吴方博 《传感技术学报》 CAS CSCD 北大核心 2024年第9期1563-1570,共8页
在进行窄带主动噪声控制(Narrowband Active Noise Control,NANC)过程中,常采用非声学传感器来获取参考信号,但非声学传感器会因老化和疲劳积累产生误差,使NANC系统频率失调(Frequency Mismatch,FM),导致降噪性能下降,甚至失效。针对此... 在进行窄带主动噪声控制(Narrowband Active Noise Control,NANC)过程中,常采用非声学传感器来获取参考信号,但非声学传感器会因老化和疲劳积累产生误差,使NANC系统频率失调(Frequency Mismatch,FM),导致降噪性能下降,甚至失效。针对此问题,提出一种基于自适应补偿(Adaptive Compensation,AC)的控制方案,该方案利用滤波增强信号与原始信号的相关性,设计一个频率跟踪质量评价因子,使该方案能更精准地实现对频率的追踪,以取得更优的FM补偿效果。通过仿真对比发现,与传统解决方案相比,AC方案能应对更大FM,使NANC系统具有更好的稳定性,初步验证了算法的优越性。进一步开展台架试验与实机实验,试验结果表明:当FM达到10%,经AC方案优化的NANC系统对挖掘机2、4、6阶噪声降噪量仍达到了15.2 dB、24.1 dB、21.2 dB,进一步验证了AC方案的性能。同时,也表明所提AC方案能有效实现对FM的控制,具有较高的实用价值。 展开更多
关键词 窄带主动噪声控制 频率失调 延时陷波算法 最速下降法 非声学传感器
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Feed-Forward Active Noise Control System Using Microphone Array 被引量:4
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作者 Yang Li Lichuan Liu Sen M.Kuo 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2018年第5期946-952,共7页
Feedforward active noise control(ANC)system are widely used to reduce the wide-band noise in different application.In feedforward ANC systems,when the noise source is unknown,the misplacement of the reference micropho... Feedforward active noise control(ANC)system are widely used to reduce the wide-band noise in different application.In feedforward ANC systems,when the noise source is unknown,the misplacement of the reference microphone may violate the causality constraint.We present a performance analysis of the feedforward ANC system under a noncausal condition.The ANC system performance degrades when the degree of noncausality increases.This research applies the microphone array technique to feedforward ANC systems to solve the unknown noise source problem.The generalized cross-correlation(GCC)and steering response power(SRP)methods based on microphone array are used to estimate the noise source location.Then,the ANC system selects the proper reference microphone for a noise control algorithm.The simulation and experiment results show that the SRP method can estimate the noise source direction with 84%accuracy.The proposed microphone array integrated ANC system can dramatically improve the system performance. 展开更多
关键词 active noise control CAUSALITY direction estimation generalized cross-correlation(GCC) microphone-array noise pollution noise source steering response power(SRP)
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Adaptive ANFIS-based filter for active control of sinusoidal primary noise in nonlinear path 被引量:3
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作者 于志 刘剑 +1 位作者 刘丹 孙金玮 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第5期137-142,共6页
Linear active noise control (ANC) system is promising in suppressing broadband and narrowband noise in a linear acoustic site.However,in some situations,the acoustic systems are nonlinear which make the primary noise ... Linear active noise control (ANC) system is promising in suppressing broadband and narrowband noise in a linear acoustic site.However,in some situations,the acoustic systems are nonlinear which make the primary noise being nonlinear distortion at the canceling point,and the linear ANC system maybe can not work well for these cases.This paper presents an adaptive network-based fuzzy inference system (ANFIS)-based nonlinear filter for active noise control,which is expected to be successfully applied to situations with nonlinear distortion.In the proposed adaptive control algorithm,the parameters are updated by gradient descent method.In the simulations,the secondary-path FIR model coefficients are estimated in advance by off-line system identification method,and one case for sinusoidal primary noise with nonlinear distortion is presented,which verifies the effectiveness of the proposed system in suppressing sinusoidal noise generated by rotating machines,e.g.,engines in vehicles. 展开更多
关键词 active noise control ANFIS sinusoidal noise
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Active Noise Control of the Heavy Truck Interior Cab 被引量:1
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作者 李惠彬 刘海光 +1 位作者 刘吉春 上官云飞 《Journal of Beijing Institute of Technology》 EI CAS 2008年第4期400-404,共5页
In order to control the noise of the heavy truck interior cab effectively, the active noise control methods are employed. First, an interior noise field test for the heavy truck is performed, and frequencies of interi... In order to control the noise of the heavy truck interior cab effectively, the active noise control 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 less than 800Hz. Then the least squares lattice (LSL) algorithm is used as signal processing algorithm of the controller and a closed-loop control DSP system, based on TMS 320VC5416, is developed. The residual signal at driver's ear is used as feedback signal. 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. 展开更多
关键词 heavy truck cab interior noise LSL algorithm active noise control
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Analysis and active control of low frequency booming noise in car 被引量:2
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作者 曹友强 Deng Zhaoxiang +1 位作者 Zhang Yu Chen Dexin 《High Technology Letters》 EI CAS 2015年第4期414-421,共8页
For Lightweight body,sound radiation and sound insulation performance have negative effects on interior noise by the deterioration of local stiffness and modality.So the research on the active control of vibration and... For Lightweight body,sound radiation and sound insulation performance have negative effects on interior noise by the deterioration of local stiffness and modality.So the research on the active control of vibration and noise for car body panels is useful for engineering.Analysis and active control of booming noise in car is researched by using a new active damping vibration reduction technology named smart constrained layer damping(SCLD).According to the vibration characters of body roof,an optimal placement of actuators is distributed.Based on dSPACE hardware in loop environment,an adaptive active control system is designed.Selecting vibration signals of engine mounting point as the reference input of adaptive controller,an active control experiment of booming noise for mini-car is carried out.Experimental results show that,when the engine speed is at 3700 RPM and4250RPM,the interior booming noise decreases 4.2dB(A),and 3.5dB(A) separately.It proposes new methods and techniques for intelligent control of car body NVH in the future. 展开更多
关键词 interior booming noise smart constrained layer damping SCLD) adaptive active control system active control
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Flower Pollination Heuristics for Nonlinear Active Noise Control Systems 被引量:1
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作者 Wasim Ullah Khan Yigang He +3 位作者 Muhammad Asif Zahoor Raja Naveed Ishtiaq Chaudhary Zeshan Aslam Khan Syed Muslim Shah 《Computers, Materials & Continua》 SCIE EI 2021年第4期815-834,共20页
In this paper,a novel design of the flower pollination algorithm is presented for model identification problems in nonlinear active noise control systems.The recently introduced flower pollination based heuristics is ... In this paper,a novel design of the flower pollination algorithm is presented for model identification problems in nonlinear active noise control systems.The recently introduced flower pollination based heuristics is implemented to minimize the mean squared error based merit/cost function representing the scenarios of active noise control system with linear/nonlinear and primary/secondary paths based on the sinusoidal signal,random and complex random signals as noise interferences.The flower pollination heuristics based active noise controllers are formulated through exploitation of nonlinear filtering with Volterra series.The comparative study on statistical observations in terms of accuracy,convergence and complexity measures demonstrates that the proposed meta-heuristic of flower pollination algorithm is reliable,accurate,stable as well as robust for active noise control system.The accuracy of the proposed nature inspired computing of flower pollination is in good agreement with the state of the art counterpart solvers based on variants of genetic algorithms,particle swarm optimization,backtracking search optimization algorithm,fireworks optimization algorithm along with their memetic combination with local search methodologies.Moreover,the central tendency and variation based statistical indices further validate the consistency and reliability of the proposed scheme mimic the mathematical model for the process of flower pollination systems. 展开更多
关键词 active noise control computational heuristics volterra filtering flower pollination algorithm
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Simulation Study of Active Noise Control in Wind Turbines Using FxLMS Adaptation Algorithm
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作者 Soumya Roy Pratik Naik 《Journal of Power and Energy Engineering》 2017年第8期72-83,共12页
Utility scale wind turbines produce a significant amount of noise which has been identified as one of the most critical challenges to the widespread use of wind energy. Aerodynamic noise caused primarily by the intera... Utility scale wind turbines produce a significant amount of noise which has been identified as one of the most critical challenges to the widespread use of wind energy. Aerodynamic noise caused primarily by the interaction of the boundary layer and (or) the upstream atmospheric turbulence with the trailing edge of the blade has been identified as the most dominant source of noise in wind turbines. The authors here propose an active noise control system based on the FxLMS algorithm which can achieve suppression of noise from a modern wind turbine. Two types of noise sources have been simulated: monopole and dipole. The results of the active noise control algorithm are validated with simulations in MATLAB. The agreement between the results shows the far impact of active noise control techniques will have in future wind turbines. 展开更多
关键词 active noise control MONOPOLE DIPOLE FxLMS ALGORITHM
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A Hybrid Nonlinear Active Noise Control Method Using Chebyshev Nonlinear Filter
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作者 Bin Chen Shuyue Yu Yan Gao 《Sound & Vibration》 2018年第4期21-27,共7页
Investigations into active noise control(ANC)technique have been conducted with the aim of effective control of the low-frequency noise.In practice,however,the performance of currently available ANC systems degrades d... Investigations into active noise control(ANC)technique have been conducted with the aim of effective control of the low-frequency noise.In practice,however,the performance of currently available ANC systems degrades due to the effects of nonlinearity in the primary and secondary paths,primary noise and louder speaker.This paper proposes a hybrid control structure of nonlinear ANC system to control the non-stationary noise produced by the rotating machinery on the nonlinear primary path.A fast version of ensemble empirical mode decomposition is used to decompose the non-stationary primary noise into intrinsic mode functions,which are expanded using the second-order Chebyshev nonlinear filter and then individually controlled.The convergence of the nonlinear ANC system is also discussed.Simulation results demonstrate that proposed method outperforms the FSLMS and VFXLMS algorithms with respect to noise reduction and convergence rate. 展开更多
关键词 Nonlinear active noise control Chebyshev nonlinear filter non-stationary noise ensemble empirical mode decomposition
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Dynamic Active Noise Control of Broadband Noise in Fighter Aircraft Pilot Helmet
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作者 Y.K.Bharath S.Veena 《Sound & Vibration》 EI 2022年第4期319-331,共13页
This paper presents the development of a dynamic Active Noise Control(ANC)algorithm aimed towards redu-cingthe broadbandnoiseinside the helmet earcups ofafighter aircraftpilot helmet.The dynamicANC involves a Variable ... This paper presents the development of a dynamic Active Noise Control(ANC)algorithm aimed towards redu-cingthe broadbandnoiseinside the helmet earcups ofafighter aircraftpilot helmet.The dynamicANC involves a Variable Step-Size Griffiths(VSSG)FxLMS algorithm to attenuate noise entering directly through helmet,a LMS based adaptive noise canceller to attenuate noise entering through the pilot microphone,and energy detectors for failure protection and optimized battery power usage.The algorithms are implemented on Texas Instruments’TMS320C6748 processor and are tested in a helmet ANC experimental setup. 展开更多
关键词 active noise control Variable Step-Size Griffiths algorithm FxLMS
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Automatic Stabilization of an Adaptive Feedback Control for Noise Cancelling In-ear Headphones
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作者 Sven Hoeber Christian Pape Eduard Reithmeier 《Journal of Mechanics Engineering and Automation》 2016年第7期364-372,共9页
Headphones with an integrated active noise cancellation system have been increasingly introduced to the consumer market in recent years. When exposing the human ear to active noise sources in this striking distance, t... Headphones with an integrated active noise cancellation system have been increasingly introduced to the consumer market in recent years. When exposing the human ear to active noise sources in this striking distance, the ensuring of a safe sound pressure level is vital. In feedback systems, this is coupled with the stability of the closed control loop; stable controller design is thus essential. However, changes in the control path during run-time can cause the stable control system to become unstable, resulting in an overdrive of the speakers in the headphones. This paper proposes a method, which enables the real-time analysis of the current system state and if necessary stabilizes the closed loop while maintaining the active noise reduction. This is achieved by estimating and evaluating the open loop behavior with an adaptive filter and subsequently limiting the controller gain in respect to the stability margin. 展开更多
关键词 active noise cancellation feedback control stability analysis.
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Active noise control using the filtered-X RLS algorithm with sequential updates
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作者 TAN Li JIANG Jean 《通讯和计算机(中英文版)》 2009年第5期9-14,共6页
关键词 FXLMS 计算机 算法 运算法则
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SMART STRUCTURES USING PIEZOELEMENTS FOR ACTIVE VIBRATION AND NOISE SUPPRESSION IN AVIATION AND AEROSPACE 被引量:1
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作者 陈仁文 陶宝祺 +1 位作者 陈勇 朱晓锦 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1998年第2期39-44,共6页
Smart material and structure (SMS) is a challenging novel technique for the 21 century especially in fields of aviation and aerospace. Vibration and noise suppression smart structure is an important branch of SMS. T... Smart material and structure (SMS) is a challenging novel technique for the 21 century especially in fields of aviation and aerospace. Vibration and noise suppression smart structure is an important branch of SMS. There are several typical structures such as the cabin of an airplane, space station, the solar board of satellite and the rotor blade of a helicopter, of which the vibrations and radiation noises have bad influences on precise equipments and aiming systems. In order to suppress vibrations and noises of these structures, several algorithms are applied to the models which simulate the structures. Experiments are performed to suppress vibrations and noises by bonding sensors and actuators to the structures at the optimized locations and using computer based measurement and control systems. For the blade vibration control of a helicopter, a non contact method of signal transmission by magneto electric coupling is discussed. The experimental results demonstrate that the methods used for active control are effective. 展开更多
关键词 VIBRATION active control smart structure piezoceramic element noise suppression test and measurement system
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Active control of structural sound radiation in an acoustic enclosure consisting of flexible structure
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作者 陈大林 陈南 《Journal of Southeast University(English Edition)》 EI CAS 2014年第3期318-322,共5页
The active control of structural sound radiation in an acoustic enclosure is studied by using distributed point force actuators as the secondary control force, and the control mechanisms for the radiated noise in the ... The active control of structural sound radiation in an acoustic enclosure is studied by using distributed point force actuators as the secondary control force, and the control mechanisms for the radiated noise in the cavity are analyzed. A rectangular enclosure involving two simply supported flexible plates is created for this investigation. The characteristics of the primary and secondary sound field and the structural-acoustic coupled system are analyzed, and the optimal control objective for reducing the sound pressure level (SPL) in the cavity is derived. The response of the SPL in the cavity is analyzed and compared when the secondary point force actuators with different locations and parameters are applied to the two flexible plates. The results indicate that the noise in the cavity can be better controlled when some point force actuators are applied to two flexible plates for cooperative control rather than the point force actuators being only applied to the excited flexible plate. 展开更多
关键词 active control acoustic mode radiated noise control mechanism sound pressure level (SPL)
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Application of system identification in a practical active noise control system
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作者 Yu Yuan Zhaoyang Sun Hongwei Zhang 《Control Theory and Technology》 EI CSCD 2024年第2期282-291,共10页
Noise pollution has become increasingly severe around the world due to fast urbanization. How to soundproof windows from outside noise is of significant interest for both academia and industry. This paper reports an e... Noise pollution has become increasingly severe around the world due to fast urbanization. How to soundproof windows from outside noise is of significant interest for both academia and industry. This paper reports an experimental implementation of normalized minmax active noise control (ANC) algorithm on an open window system, where identifying the model of acoustic sound paths plays a central role. By doing this, traffic noise is attenuated by the ANC system, leading to a relatively quiet indoor environment, while the natural lighting and ventilation functions of a window are remained. Our experiments show that an average of 19 dB(A) noise reduction is achieved. 展开更多
关键词 active noise control Multi-input-multi-output system Normalized minimax algorithm System identification
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Ear Field Adaptive Noise Control for Snoring:An Real-time Experimental Approach
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作者 Lichuan Liu Karunakar Reddy Pottim Sen M.Kuo 《IEEE/CAA Journal of Automatica Sinica》 EI CSCD 2019年第1期158-166,共9页
In this paper, an active noise control(ANC) system is developed to provide an effective and non-intrusive solution for reducing loud snoring to provide a quiet environment for a snorer's bed partner. An adaptive l... In this paper, an active noise control(ANC) system is developed to provide an effective and non-intrusive solution for reducing loud snoring to provide a quiet environment for a snorer's bed partner. An adaptive least mean square(LMS)algorithm optimized for different kinds of snore signals is introduced and theoretically analyzed. Also, a residual noise masking approach is proposed to further reduce the effect of the snore noise without interfering with the LMS algorithm. Computer simulations followed by real-time experiments are conducted to demonstrate the feasibility of the snore ANC systems based on a pillow setup. For the optimum effect based on the characteristics of human hearing, the performance of the proposed approach is evaluated by using the multi-channel feedforward ANC systems based on the filtered-X least mean square(FXLMS) algorithm.Compared with a traditional headboard setup for snoring noise control, the proposed snore ANC systems optimized for ear field operation yield much higher noise reduction around the ears of the snorer's bed partner. 展开更多
关键词 active noise control (anc) audio integrated anc EAR FIELD filtered-X least mean SQUARE (FXLMS) snore MULTI-CHANNEL
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Active Control of Sound Transmission in Ship Cabins Through Multiple Independently Supported Flexible Subplates
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作者 Liping Zhu Tiejun Yang +2 位作者 Xinhui Li Lihong Pang Minggang Zhu 《Journal of Marine Science and Application》 CSCD 2020年第1期116-126,共11页
The vibration and noise produced by the powertrain and waves inside ship cabins limit working efficiency and crew and passengers’accommodation quality.This paper simplifies ship cabins as cavities and explores active... The vibration and noise produced by the powertrain and waves inside ship cabins limit working efficiency and crew and passengers’accommodation quality.This paper simplifies ship cabins as cavities and explores active control techniques to attenuate sound transmission via multiple parallel-supported flexible subplates.The theoretical formulations of the interaction between multiple subplates and cavities were performed and the coupling relationships between them were analyzed.Based on the multiple subplates and the cavity coupling models,numerical simulations were performed using the derived optimal controller to minimize the transmission of sound into the cavities through two and nine parallel-supported subplates.The various control strategies were explored to minimize the coupling system’s acoustic potential energy,and the control performances were compared and discussed.The mechanism of reducing sound transmission through multiple supported subplates into a cavity is revealed.The simulation results showed that the vibration pattern of the controlled subplate is changed after it is regulated,which increases its radiation to subdue the other subplates’radiation,while increasing vibration of the controlled subplate.The more subplates a cavity has,the more kinetic energy the controlled subplate possess.Furthermore,the noise reduction performance of a cavity with fewer subplates is better than that with more subplates. 展开更多
关键词 active structural-acoustic control Cabin noise Multiple subplates Sound radiation Structural-acoustic coupling
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车内单座椅局部区域有源噪声控制研究
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作者 于洋 李航 +1 位作者 邹海山 林志斌 《南京大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第2期328-338,共11页
目前,汽车局部区域降噪主要通过有源降噪头枕来降低人耳处的噪声,但乘客的移动会影响降噪效果.结合人头跟踪系统可解决这一问题,代价是增加系统的复杂性和成本.以车门扬声器为次级声源,在副驾驶位置乘客头部周围较大的区域进行局部降噪... 目前,汽车局部区域降噪主要通过有源降噪头枕来降低人耳处的噪声,但乘客的移动会影响降噪效果.结合人头跟踪系统可解决这一问题,代价是增加系统的复杂性和成本.以车门扬声器为次级声源,在副驾驶位置乘客头部周围较大的区域进行局部降噪,并优化误差传感策略提升其降噪性能.首先,建立轻度阻尼边界的闭空间声场有限元模型;然后,基于该模型研究了某一局部区域内取得3 dB降噪效果的频率上限、误差点数量和位置对降噪效果的影响以及误差点布放的优化问题;最后,在典型城市道路上进行不同车速下的有源噪声控制实验.结果表明,车速为50,60和80 km·h^(-1)时,副驾驶头部区域内(0.4 m×0.4 m×0.2 m)3 dB降噪的频率上限约为370 Hz,误差点位置对降噪效果有较大影响.采用遗传算法优化误差点选择可提高降噪性能,使用12个优选误差点即可达到使用75个均匀布放误差点的降噪效果. 展开更多
关键词 有源噪声控制 局部区域降噪 汽车路噪 误差传感策略
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