Noise control

Xem 1-20 trên 54 kết quả Noise control
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Filtered-X Affine Projection Algorithms for Active Noise Control Using Volterra Filters

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  • Noise Control is one of the most important subjects in acoustic engineering and one of the prevalent health hazards in the industry, and in the city. A comprehensive overview, application of principles, and concept of noise control, in a wide variety of fields, is found in this book. The authors provide a range of practical applications of current noise control strategies and technologies offering to the reader their research in this field with concrete examples and results of actual experiments. Literature widely quoted in this book is full of examples of more advanced applications.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Phasor Representation for Narrowband Active Noise Control Systems

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Analysis of Effort Constraint Algorithm in Active Noise Control Systems

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  • In 2005 the National Academy of Engineering (NAE) held a workshop to review the present state of technology in noise control engineering. The workshop was organized by a steering committee charged with developing a prospectus for further studies of noise-related issues in the United States and to investigate how current technologies could be used to reduce exposures to noise. The issues framed by the steering committee were subsequently considered in a series of workshops held by NAE in 2007 and 2008...

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  • This new science seeks to emphasize the immediate duty of man to better his conditions by availing himself of knowledge already at hand. As far as in him lies he must make application of this knowledge to secure his greatest efficiency under conditions which he can create or under such existing conditions as he may not be able wholly to control, but such as he may modify. The knowledge of the causes of disease tends only to depress the average citizen rather than to arouse him to combat it. Hope of success will urge him forward, and it is the duty of lovers of mankind...

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  • This book is a compilation of some selected articles devoted to the analysis and control of vibrations. Vibrations are a phenomenon found in many engineering systems; their harmful effects are translated into low performance, noise, energy misspend, discomfort and system breakdown, among others. These are the reasons why, in the last years, researchers have made great efforts in seeking ways to eliminate them totally or partially.

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  • First placed on the market in 1939, the design of PID controllers remains a challenging area that requires new approaches to solving PID tuning problems while capturing the effects of noise and process variations. The augmented complexity of modern applications concerning areas like automotive applications, microsystems technology, pneumatic mechanisms, dc motors, industry processes, require controllers that incorporate into their design important characteristics of the systems.

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  • Motivated by the need of energy-efficiency improvements, process optimization, soft-start capability and numerous other environmental benefits, it may be desirable to operate induction motors for many applications at continuously adjustable speeds. The induction motor drives can provide high productivity with energy efficiency in different industrial applications and are the basis for modern automation. This book provides an account of this developing subject through such topics as modelling, noise, control techniques used for high-performance applications and diagnostics....

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  • The environment and the problems of environmental pollution are not new. The Industrial Revolution, whilst bringing prosperity to Great Britain, could be said to be the starting point for the increasing concern over environmental pollution. Early public health legislation, such as the Public Health and Clean Air Acts, endeavoured to regulate pollution to some extent, but it wasn’t until the Environmental Protection Act 1990 that any major strides were made in controlling emissions to the environmental media: air, water and land....

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  • (BQ) Part 1 book "Engine testing - Theory and practice" has contents: Test facility specification, system integration and project organization, the test cell as a thermodynamic system, vibration and noise, test cell and control room design - an overall view, ventilation and air conditioning,... and other contents.

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  • Evaluating the average probability of symbol error for different bandpass modulation schemes Comparing different modulation schemes based on their error performances. Channel coding: Transforming signals to improve communications performance by increasing the robustness against channel impairments (noise, interference, fading, ..) Waveform coding: Transforming waveforms to better waveforms Structured sequences: Transforming data sequences into better sequences, having structured redundancy. “Better” in the sense of making the decision process less subject to errors....

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  • In most HVAC systems, the final energy transport medium is moist air—a mixture of dry air and water vapor. This is conveyed through filters, heat exchange equipment, ducts, and various terminal devices to the space to be air-conditioned. The power to move the air is supplied by fans. This chapter discusses fans and duct systems, together with related subjects such as grilles, registers, diffusers, dampers, filters, and noise control.

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  • Conventional servo systems, to ensure machine performance, smoothness, positional error and low servo noise, require the adjustment of its servo’s gains as an initial crucial step. Even systems that employ auto-tuning require manual tweaking after the system is installed, especially if more that one axis are interdependent. Ezi-SERVO® employs the best characteristics of stepper and closed loop motion controls and algorithms to eliminate the need of tedious gain tuning required for conventional closed loop servo systems.

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  • Tham khảo sách 'refrigeration and air conditioning iv (equipment cooling) aipd', kỹ thuật - công nghệ, năng lượng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Vibrations are a part of our environment and daily life. Many of them are useful and are needed for many purposes, one of the best example being the hearing system. Nevertheless, vibrations are often undesirable and have to be suppressed or reduced, as they may be harmful to structures by generating damages (possibly leading to dramatic and spectacular accidents such as the case of the Aloha 243 fl ight or the bridge of Tacoma Narrows) or compromise the comfort of users through noise generation of mechanical wave transmission to the body....

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  • This volume, based on the proceedings of the Sixth International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines and Propellers aims at promoting an international exchange of current research in unsteady flow phenomena in turbomachines and propellers.

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  • CHAPTER 45 NOISE AND ITS CONTROL David A. Towers, RE. Senior Consultant Harris Miller Miller & Hanson Inc. Lexington, Massachusetts Erich K. Bender, Ph.D. Divisional Vice President Paul J. Remington, Ph.D. Principal Engineer Eric E. Ungar, P.E., Ph.D. Chief Consulting Engineer Bolt Beranek and Newman Inc. Cambridge, Massachusetts 45.1 INTRODUCTION / 45.1 45.2 NOISE MEASUREMENT AND ANALYSIS / 45.2 45.3 NOISE EFFECTS AND STANDARDS / 45.15 45.4 NOISE CONTROL/45.18 REFERENCES / 45.37 45.7 INTRODUCTION Noise is unwanted audible sound.

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  • IMPULSIVE NOISE 12.1 12.2 12.3 12.4 12.5 12.6 12.7 Impulsive Noise Statistical Models for Impulsive Noise Median Filters Impulsive Noise Removal Using Linear Prediction Models Robust Parameter Estimation Restoration of Archived Gramophone Records Summary I mpulsive noise consists of relatively short duration “on/off” noise pulses, caused by a variety of sources, such as switching noise, adverse channel environments in a communication system, dropouts or surface degradation of audio recordings, clicks from computer keyboards, etc.

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  • Tham khảo sách 'noise and vibration control', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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