Dissertations / Theses on the topic 'Air ducts – Noise ; Noise control'
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Trinder, M. C. J. "Active noise control in finite length ducts." Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371924.
Full textMcNicol, Ian David. "Active adaptive cancellation of sound in ducts /." Title page, contents and synopsis only, 1985. http://web4.library.adelaide.edu.au/theses/09ENS/09ensm169.pdf.
Full textUosukainen, Seppo. "JMC method applied to active control of sound : theoretical extensions and new source configurations /." Espoo [Finland] : Technical Research Centre of Finland, 1999. http://www.vtt.fi/inf/pdf/publications/1999/P386.pdf.
Full textSnyder, Scott D. "A fundamental study of active noise control system design /." Title page, contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phs675.pdf.
Full textSlagley, Jeremy Michael. "Effects of diameter and cross-sectional partitioning on active noise control in round ducts." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4490.
Full textTitle from document title page. Document formatted into pages; contains ix, 77 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 75-77).
Farooqui, Maaz. "Innovative noise control in ducts." Doctoral thesis, KTH, Farkost och flyg, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192927.
Full textQC 20160923
Chan, T. M. "Active control of sound in ducts." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390327.
Full textMak, Cheuk-Ming. "The application of computational fluid dynamics to the prediction of regenerated noise in ventilation systems." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321131.
Full textBlondel, Laurent Armand. "Compressed air acoustic sources for active noise control." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246196.
Full textHomma, Kenji. "Compact Integrated Active-Passive Approach for Axial Fan Noise Control." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29067.
Full textPh. D.
Michaud, Alexander Page. "Experimental Investigation of Reflection of Airborne Noise at Duct Terminations." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16209.
Full textWhite, Andrew. "On Implemintation of Loudspeakers for Feedback Control, Open-Air, Active Noise Control Headsets." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/35936.
Full textMaster of Science
Kwan, E. K. M. "The use of inlet valve control and air heating for reducing diesel engine noise." Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234054.
Full textZou, Feng 1977. "Real-time trajectory optimization and air traffic control simulation for noise abatement approach procedures." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17834.
Full textIncludes bibliographical references (p. 89-90).
Aircraft noise is a major obstacle to the growth of aviation. This thesis presents an adaptive onboard real-time optimization algorithm and an Air Traffic Control simulation model that can minimize the aircraft approach noise and meet air traffic control targets and restrictions. The adaptive real-time optimization algorithm uses dynamic programming, nonlinear optimization, and receding horizon control to generate approach procedures. The resulting noise abatement trajectories compensate for environmental uncertainties, provide more flexibility to air traffic controllers and pilots, and improve airport efficiency while lowering community noise. The Air Traffic Control simulation model simulates a fleet approach with noise abatement approaches. Three different status displays are tested and compared in the simulation, and the optimal displays for controller are explored in the thesis.
by Feng Zou.
S.M.
Hird, Cameron Ian. "Reduction of structure-borne noise of a constrained plate excited by an air-borne source." Thesis, Queensland University of Technology, 1996. https://eprints.qut.edu.au/36244/1/36224_Fooks_1993.pdf.
Full textBrady, Lori Ann. "Application of the Herschel-Quincke Tube Concept to Higher-Order Acoustic Modes in Two-Dimensional Ducts." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31479.
Full textMaster of Science
Van, der Merwe Andre Francois. "An air suspension cushion to reduce human exposure to vibration." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/473.
Full textGrotta, Danubia de Lima. "Materiais e técnicas contemporâneas para controle de ruído aéreo em edifícios de escritórios: subsídios para especificações." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18141/tde-26052009-112244/.
Full textBig cities have been taken the ground thought freeways and avenues, where constant and loud noise takes place. At theses ways, corporate edifices are also often established, so they naturally become exposed to the external noise interference, regardless the own internal facilities noising. The consequence is that people how work at these places are more prone to be less productive, turning it into a drawback to the corporate. The scenario described above is very concerning. This general research objective is to study techniques and industrialized material in order to reduce and control the noise propagation thought the air on for corporate facilities, focused at the last ten years time frame. It will focus on study and present the technical characteristics for acoustic absorption and/or isolation of roof lining, acoustic barriers, walls, floor, office layout, furniture, glasses, air-conditioner, and sound masking techniques. The specific research objective is to analyze the materials for acoustic handling, based on acoustic classification indexes that relate to the material performance, for absorption and isolation, as listed: NRC (Noise Reduction Coefficient), \'alfa\' (Sound Absorption Coefficient), \'alfa\'w (Pounder Sound Absorption Coefficient), Rw (Noise Reduction Index) and STC (Sound Transmission Class). The objective of this research is to be a single point of reference for technical data regarding the utilization of materials that can be used to control the sound propagation thought the air on corporate edifices; the classification of analysis and performance as well as the evaluation of technical information available on Brazilian product catalogs. The research result offers a baseline for those who look for criteria during the speciation and implementation of corporative spaces. The conclusion of this work is done with the Authors considerations regarding the utilization of materials and techniques, as well the necessity of creation and production of wider product portfolio.
McNicol, Ian David. "Active adaptive cancellation of sound in ducts." Thesis, 1985. http://hdl.handle.net/2440/122351.
Full textSingh, Sarabjeet. "Tonal noise attenuation in ducts by optimising adaptive Helmholtz resonators." 2006. http://hdl.handle.net/2440/37877.
Full textThesis (M.Eng.Sc.)--School of Mechanical Engineering, 2006.
Singh, Sarabjeet. "Tonal noise attenuation in ducts by optimising adaptive Helmholtz resonators." Thesis, 2006. http://hdl.handle.net/2440/37877.
Full textThesis (M.Eng.Sc.)--School of Mechanical Engineering, 2006.
Zander, Anthony Charles. "Influence of error sensor and control source configuration and type upon the performance of active noise control systems / Anthony C. Zander." 1994. http://hdl.handle.net/2440/21488.
Full textx, 251 leaves : ill. ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Thesis (Ph.D.)--University of Adelaide, Dept. of Mechanical Engineering, 1994
Venkatesham, Balide. "Breakout Noise From The Coupled Acoustic-Structural HVAC Systems." Thesis, 2008. http://hdl.handle.net/2005/768.
Full textLai, Jienwen, and 賴建汶. "Active Noise Control for Ducts." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/47969695485288909268.
Full text國立交通大學
機械工程系
89
In this paper, we discuss some issues for active duct noise control. The research will be divided into two main parts. First, our work presents a problem of electronic delay in active noise control systems and a multirate signal processing approach is utilized to minimize the electronic delay in the control loop. In this approach, the computation efficiency is further enhanced by a polyphase method. The second main part of this paper describes a comb filter is used to replace the repetitive controller in broadband spatially feedforward ANC algorithms. In this algorithm, two types of LMS-based algorithms are used. In addition, we also handle acoustic echo cancellation and noise rejection in communication system using off-line modeling and adaptive filter techniques. The proposed methods are realized on the platform of a TMS320C32 floating point digital signal processor (DSP) equipped with four 16-bit analog IO channels and they are proven to be valid from the detailed design, analysis, and implementation for the experimental duct system.
TIAN, QI-WEI, and 田奇偉. "Active noise control for ducts." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/19524627648537535314.
Full textPan, Ray, and 潘雷. "Hybrid Noise Control in Ducts." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/74159932461823052813.
Full text華梵大學
機電工程研究所
91
The thesis is aimed at attenuating duct noise by employing hybrid noise control. The hybrid noise control method consists of methods of active noise control and semi-active noise control. In this thesis a Helmholtz resonator is used for the semi-active noise control in a duct. When the frequency of noise source in the duct is coincident with the natural frequency of the resonator, one can obtain an anti-resonance noise reduction to its best extent of the Helmholtz resonator. For the active noise control method, an anti-phase sound source is added at the down stream of the duct and an adaptive control law is used for generating anti-noise to destructively interfere with the primary noise. Integrating the two noise control methods for further improving duct noise attenuation is conducted and validated by experimental studies. The frequency range used in the experimental studies is from 230Hz to 790Hz. For the two-tone noise sources, two noise sources with 300-600Hz and 400-500Hz are included. Experimental results show that the averaged noise reductions for the semi-active, active and hybrid noise control for pure-tone excitation are 11.7, 18.8 and 20.9 dB, respectively, while effective noise attenuations for the two-tone noise sources are also observed.
YU, CHIH-WEI, and 游智為. "Active Noise Control in Ducts: A Comparative Study." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/91685763386878182258.
Full text華梵大學
機電工程研究所
88
This thesis presents two kinds of adaptive control to reduce noise in a duct for active noise control with single microphone. The first controller employs two adaptive filters to accomplish plant disturbance canceling and is termed plant disturbance canceller, and the other controller is the self-tuning regulator. The two adaptive controllers are compared for noise reduction of fixed-frequency and varying-frequency disturbances with and without changing environments. The two adaptive controllers have these advantages: (1) Cost effective since only one microphone is used, (2) Without the problem of sound pressure feedback from the secondary speaker to the reference microphone, as used in the feedforward control configuration. The plant disturbance canceller used in this thesis can be found in many literatures. However, system identification for modeling the plant dynamic needs to be done prior to controller application. To remedy this difficulty, we offer a new control method for plant disturbance canceller that can learn its plant on-line. Model improvement for this controller’s practicability, an thus be obtained. Another controller presented in this thesis is the self-tuning regulator. It is a controller that can tune its parameters according to environment changes and hence it has a higher practicability.
曾淑春. "Active and Passive Noise Control Methods in Acoustic Ducts." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/86945958530731991410.
Full text文化大學
勞工研究所
86
This study focuses on the development of passive and active noise control techniques for noise control in ducts. For passive noise control technique both reactive and dissipate noise control techniques are used in this research to investigate their noise control effects under different noise frequencies. Noise generator is used as the noise source and the wooden duct is built to simulate the duct in factory. Experiment results indicate both reactive and dissipate noise control techniques are effective in reducing noises in ducts. However, the noises can be reduced to certain levels only due to saturation effect. Noise control techniques can not eliminate noises indefinitely. By combining both active and dissipate noise control techniques the noise reduction effects are significant. For active noise control technique the recent development and application of this technique is reviewed and integrated in this research. In addition, the application conditions as well as scope are indicated to provide the basis for those interested in noise control.
Liao, Ching-Wen, and 廖慶文. "Adaptive Active Noise Control in Ducts with Dual Voice Coil Speaker Actuator." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44402780943786286443.
Full text國立中興大學
機械工程學系所
94
A novel secondary-path model of speaker-duct systems and a face velocity sensor of dual voice coil speakers are first developed in this study. A combined design of active noise control (ANC) and face velocity control (FVC) based on the identified secondary-path model is further proposed to set up an adaptive feedback ANC/FVC controller with a modified filtered-X recursive least square (FxRLS) algorithm for ANC applications. Experiments show that the feedback ANC/FVC controller with the developed velocity sensor can achieve better performance as compared to that of a FIR filter with the conventional FxRLS algorithm. A commutation error (CE) is then considered in addition to the conventional residual error to generate the innovative residual error. Such an error is applied into cost functions to derive finite impulse response (FIR) and infinite impulse response (IIR) filter-based adaptive algorithms for ANC applications, referred to as FxRLS/CE and FuRLS/FRE+CE algorithms, respectively. Convergence analyses based on Lyapunov stability criteria for time-varying discrete-time systems can be carried out for the FxLMS/CE, FxRLS/CE and FuRLS/ FRE+CE algorithms to ensure stability. Computer simulations and experiments demonstrate that the innovative residual error-based adaptive algorithms can free the restriction of the slow-adaptation assumption in the conventional ANC approaches.
Hsiao, Te Sheng, and 蕭得聖. "Theoretical Analysis and Practical Design of Active Noise Control Systems in Ducts." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/81894857636407178142.
Full text國立交通大學
控制工程系
85
Feedforward control methods of active noise cancellation system inducts are investigated both theoretically and experimentally. Without any modal truncation and thus reserving the distributed-parameter nature of theacoustic system, the plant model used in this thesis can completely characterizethe plan-wave behavior in finite-length ducts. A general noise cancellationframework is constructed for stability analysis and controlller synthesis.It is shown that there exist infinitely many controllers to perfectly blocknoise propagation toward downstream area. The most attractive features ofthese controllers are their simple structures and independency of boundaryconditions. One particular controller with special physical meaning isanalyzed and experimented. The experimental results show a consistent behavioras predicted by the theory. However, the performance of this controllerdegenerates due to the difference of sensors'' dynamics and uncertainty of theplant. To alleviate this influence, an adaptive version of this controller isdesigned. Experimental results show that adaptive control is feasible andeffectively remedies these uncertainties.
Yun-wen, Yin, and 殷蘊雯. "The Effect of the Noise Control Strategies on the Noise and Air Quality of the Classroom." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/30928784062340610251.
Full text國立師範大學
衛生教育學系
86
The main purposes of this study were to explore the effects of the noisecontrol strategies on schools' noise and indoor air quality,and the subjectivephysical and psychological influences on teachers and students.The purposive samplingmethod was adopted in selecting the subjects of 254 students and 8 teachers fromLong-An Primary School in Taipei.The data were collected by field measurements andquestionaires. The following conclusions were drawn from the study.1.After the classroom's noise control strategies were fulfilled,by closing windows ,the noise reduction for the frequency of 500-4000 Hz exceeded 20dB ; and the the average noise attenuation was also improved from the original 11.7 dB(A) to 18.8 dB(A) .Indoor air quality reached the standards of the Japenese school's environmental health.2.As far as the school's noise was concerned, the physical influences on teachers were easily to feel fatique and the decrease of hearing ; as for the subjective psychological influence, their main reaction was feeling fidgety. Regarding the indoor air quality , after the school's noise control strategies were implemented , the physical influence on teachers was feeling fidgety and getting pressure.3.After the school's noise control strategies were implemented ,most of students felt that the classroom was less noisy and percentage of students felt uncomfotable was also lower statistical significantly. In the case of closing windows , regarding the indoor air quality, 48.8% students' felt sultry ,and as the physiology was involved, as high as 52% students' answers were sweating, those effects of which were noticeable.
Chen, Hung-Yu, and 陳泓宇. "Active noise control of ducts using simplified time-domain underdetermined multichannel inverse filters (TUMIF)." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9w973p.
Full textCai, Hong-ru, and 蔡宏儒. "Computational Aerodynamic and Aeroacoustic Analysis of Compressed Air Nozzles:A Study on Flow Induced Noise Control." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/66492222049091282761.
Full text國立聯合大學
環境與安全衛生工程學系碩士班
96
Jet flows powered by compressed air are used extensively in industrial settings for cleaning dust, water steam, and grime. In this kind of activity, very high jet flow speed is required, and a excessive noise develops. This will bring about the workers who exposed to noise on the possibility of hearing loss. However, only a few researches have been carried out on predicting the aeroacoustic noise because of the difficulty in obtaining detailed information of the flow field. This study is to predict the flow field and the acoustic pressure field of the air blow gun unit using commercially CFD software. Furthermore, in order to develop the solution of controlling compressed air noise, the realizing of the generation mechanism of sound and the quantifying of the noise source strength in the flow field is required. In this study, the design approach proposed is based on reducing the noise level without impairing the operation demands. Thus, this investigations adopt the dual flow mouthpiece method as the design basis, in a situation that the nozzle-exit area is maintained. Five kinds of small holes with various inclined angles(10˚, 15˚, 20˚, 25˚, 30˚) are tested. In comparison with the original single jet-stream type shows that, the noise-abating effect of using inclined-passages is significant. All these special-designed air blow gun can provide up to 13dB∼19dB of sound reduction. We also find that the one with 30-degree angle of inclination offer the best performance.
Panigrahi, Satyanarayan. "Analysis Of Multiply-Connected Acoustic Filters with Application To Design Of Combination Mufflers And Underwater Noise Control Linings." Thesis, 2006. http://hdl.handle.net/2005/367.
Full textTu, Chien-Wei, and 杜堅瑋. "The study of noise control for an inner room with air current of a high-rise building close to a roadway." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/44275924940628900972.
Full textMurphy, O., Zadeh Esmaeil Habib, I. Felician Campean, and Daniel Neagu. "Robustness of Automotive SOTA: State-of-the-art in Uncertainty Modelling." 2018. http://hdl.handle.net/10454/16558.
Full textThis paper identifies the need for thorough experimental based study for Software-over-the-air (SOTA) in an automotive context. The paper outlines the challenges and context for automotive SOTA with an extensive literature review. It then details the early stages of the experimental studies, which aim to identify the key control and noise factors that affect performance of the SOTA in an automotive environment. This contribution establishes a framework for uncertainty modelling of SOTA as a system which highlights the needs to develop solutions requiring big data gathering and analysis as next research opportunities to the scientific community.
Jaguar Land-Rover