Noise Control Articles

  • Industrial Noise Control Services

    Industrial Noise Control Studies Study different equipment noise and recommend suitable noise insulation. This include diesel generators, gas turbines, compressors, pumps, fans, chillers, factory machineries, traffic noise,...etc. Our evaluations and recommended solutions meet general guidelines and practices of international standards and nroise laboratories such as ...

  • Shanghai International Gymnastics Center case study

    223’ (68 m) diameter CST Covers Aluminum Dome and matching lower facade National and international gymnastics competitions The 4,000 seat gymnastics center/arena was built for the eighth National Games of the People’s Republic of China. The mill finish CST Covers Aluminum Dome roof is engineered to support 45,000 kg or 100,000 pounds of sound cloud and catwalk loads. The ...


    By CST Industries Inc

  • Controlling Noise at Work: An Overview

    Not sure what your noise control strategy should include? You could, of course, go for your own strategy. However, if you are new to controlling noise at work like many of our customers, you might want something tried and tested that you know will help you put you in the right direction towards compliance with the current Noise Regulations. Just ...


    By Pulsar Instruments plc

  • Acoustic Louvres for Compressor Room case study

    Process details Air and gas compressor room Supply Bank of acoustic louvres 8m wide x 3m high supplied as 4x 1.25m modules. Product selection Acoustic louvres were chosen as the best solution to provide an air volume in the compressor room of 62,000m²/hr while not increasing noise levels in the surrounding areas. ...


    By Wakefield Acoustics Ltd

  • A computational–efficient active sound tuning system for steady–state and transient vehicle powertrain response

    Conventional vehicle active noise control (ANC) methods aimed mainly at attenuating the cabin interior noise usually do not account for sound quality effects. In this paper, an active sound tuning (AST) system is proposed to reshape the vehicle powertrain response based on the predetermined vehicle interior sound quality criteria. Since it is important to develop a computational–efficient ...


    By Inderscience Publishers

  • Acoustic and Insulated Sheeting

    Powerclad Acoustic and Insulated sheeting systems are insulation materials laminated to scaffold sheeting for temporary weather protection and containment applications. Powerclad provides an effective system for controlling noise on construction sites and conditioning the working environment in both hot and cold climates. The Flame Retardant grades are ...

  • Record breaking formula one fan noise control

    Problem: an extract system fan drone creating a potential environmental noise problem. Solution: aerodynamic engineering instead of silencers – in keeping with the Red Bull Technology ethos. The conventional technique used to reduce fan tones like this is a silencer – a large, palliative silencer that doesn’t tackle the source of the ...

  • Canarina CUSTIC software · noise barrier design · commands 1

    Welcome to Canarina CUSTIC - software for noise pollution modeling. The CUSTIC Software allows you to create robust and useful numeric simulations that fully make use of the graphical user interface. This chapter show you how to sep up CUSTIC on your computer.   We can say, with a certain security that the software CUSTIC 3.2 are one of the best tools, if not the ...

  • Canarina CUSTIC software · noise barrier modeling · barriers · introduction 4

    3. Noise pollution The word "noise" comes the Latin word "nausea" meaning Sea sickness. Noise is among the most pervasive pollutants today. Noise pollution can be caused by many sources including highways, vehicles, factories, engines, machine, aircraft, helicopters, industrial development and construction work. Noise negatively affects human health and well-being. Problems related to noise ...

  • Canarina CUSTIC software · noise abatement modeling · noise analysis · introduction 7

    The intensity of two sounds L1 and L2 can be added in decibels with the standard equation: LdB=10 log[(p1/p0)2+[(p2/p0)2] and then, LdB=10 log[10L1/10+ 10L2/10] In this way, ...

  • Canarina CUSTIC software · noise control · algorithms 5

    9. References P.M.Morse, K.U.Ingard, Theoretical Acoustics, Princeton University Press. J.Llinares, A.Llopis, J.Sáncho, 1996, Acústica arquitectónica y urbanística, Universidad Politécnica de Valencia. A.Lawrence, 1970, Architectural Acoustics, Applied Science Publishers. L.Beranek, 1962, Music Acoustics and ...

  • Automotive speech control in a non-stationary noisy environment

    This paper presents a novel in-car design to recognise the driver's voice and to control in-car devices. In a non-stationary noise car environment, a speech recognition kit SR-07 with speech recognition chip HM2007 has less than 10% successful hit-rate. With an adaptive Wiener filter, the successful hit-rate has improved to as much as ...


    By Inderscience Publishers

  • Accurate and efficient prediction of acoustical performance of noise barriers against transport noise pollution

    An improved acoustical wave propagator (I_AWP) technique with high-order absorbing boundary technique is introduced to evaluate the acoustical wave interaction for noise barriers, providing the dual benefit of preserving high numerical accuracy (boundary conditions have been properly treated) and obtaining high computational efficiency (using a larger time step in the calculation). The aim is to ...


    By Inderscience Publishers

  • Comparative study of frequency domain filtered-x LMS algorithms applied to vehicle powertrain noise control

    Currently, passive noise control treatment is widely applied to treat vehicle powertrain noise. However, passive noise control technology is often not effective in the low frequency range where the response is typically the most dominant component. With the rapid development of digital signal processing, active noise control (ANC) can be a feasible alternative. In this study, an enhanced ...


    By Inderscience Publishers

  • Silence is Golden

    Modern living incurs much unwanted and disruptive noise – automobiles, trains, airplanes, jackhammers, sirens, loud speakers – occurring all around us every day. These intrusive sounds seep through walls and windows, entering our homes and businesses to join other distracting noises – humming light fixtures, air conditioners, ringing phones and loud talking. Fortunately, governments have ...


    By SoundPLAN International LLC

  • Sound field diffusivity at the top surface of schroeder diffuser barriers

    It has been shown in several studies that the T-shape profile barriers are one of the most successful noise barriers among many different profiles (May and Osman 1980; Hajek and Blaney 1984; Hothersall et al., 1991). In this case, it is shown by author (Monazzam and Lam, 2005) that in the same dimension, the T-shape profile has the highest performance compared to other profiled noise barriers. It ...


    By University of Tehran

  • Reducing noise levels through engineering controls

      It"s fairly easy to control personal exposure to noise by limiting exposure time or using hearing protectors like ear plugs or ear muffs.  Engineering controls are usually applied to the machinery that produces noise. Imagine a 200 foot x 175 foot manufacturing facility with a 30 foot high ceiling.  In this building are a variety of cut-off saws, grinders, millers and other ...

  • On the application of partial barriers for spinning machine noise control: A theoretical and experimental approach

    Noise reduction by barriers is a popular measure for environmental protection in both urban and rural areas. A barrier, which intercepts the direct path of sound from source to receiver, is frequently used to protect noise sensitive receivers from land transportation noise radiating from highways, railway lines, industrial complexes and airports. This consists of interposing a heavy non-porous or ...


    By University of Tehran

  • Dissipative expansion chambers with two concentric layers of fibrous material

    The acoustic performance of a dissipative expansion chamber lined with two concentric, annular layers of fibrous material with different resistances is investigated. A two-dimensional analytical approach is used to determine the transmission loss of this dissipative silencer. From the boundary conditions at the rigid wall, and the interfaces between the fibre layers and the central airway, the ...


    By Inderscience Publishers

  • Application of H-infinity hybrid active controller for acoustic duct noise cancellation

    This paper describes the principle and application of a hybrid robust active noise controller (ANC) for reducing broadband noise in acoustic ducts. The proposed ANC system consists of an adaptive controller with filtered-x least mean square (FXLMS) algorithm and a feedback structure with robust synthesis theory for obtaining robust performance and stabilisation. In an active control structure, ...


    By Inderscience Publishers

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