TAILIEUCHUNG - Standard Handbook of Machine Design P52

CHAPTER 45 NOISE AND ITS CONTROL David A. Towers, RE. Senior Consultant Harris Miller Miller & Hanson Inc. Lexington, Massachusetts Erich K. Bender, . Divisional Vice President Paul J. Remington, . Principal Engineer Eric E. Ungar, ., . Chief Consulting Engineer Bolt Beranek and Newman Inc. Cambridge, Massachusetts INTRODUCTION / NOISE MEASUREMENT AND ANALYSIS / NOISE EFFECTS AND STANDARDS / NOISE CONTROL/ REFERENCES / INTRODUCTION Noise is unwanted audible sound. Sound is essentially a fluctuating pressure disturbance that may act locally or propagate away from its source. Extremely intense sound can cause structural damage or equipment malfunctions,. | CHAPTER 45_ NOISE AND ITS CONTROL David A. Towers RE. Senior Consultant Harris Miller Miller Hanson Inc. Lexington Massachusetts Erich K. Bender . Divisional Vice President Paul J. Remington . Principal Engineer Eric E. Ungar . . Chief Consulting Engineer Bolt Beranek and Newman Inc. Cambridge Massachusetts INTRODUCTION NOISE MEASUREMENT AND ANALYSIS NOISE EFFECTS AND STANDARDS NOISE CONTROL REFERENCES INTRODUCTION Noise is unwanted audible sound. Sound is essentially a fluctuating pressure disturbance that may act locally or propagate away from its source. Extremely intense sound can cause structural damage or equipment malfunctions but usually its effect on humans is the primary concern. Noise can annoy people can lead to interference with speech communication can interfere with the performance of mental and delicate manual tasks and if it is intense enough can cause discomfort pain and temporary or permanent hearing damage. Fortunately many aspects of noise and its effects are well enough understood to permit their consideration in the design process. Sound can occur and propagate in any gas liquid or solid medium but sound in air is usually of primary interest. Sound may be produced by any phenomenon that can lead to fluctuating pressure disturbances. These phenomena include 1 rapid expansion of gases or injection of fluid volumes such as from explosions and engine exhausts 2 repetitive interruptions or modulation of airflows such as by siren disks or fluctuating valves 3 turbulence as present in fluid streams emerging from nozzles or duct grillages and 4 vibrating solid surfaces. In many practical situa- STANDARD HANDBOOK OF MACHINE DESIGN tions several noise-generating phenomena may occur simultaneously for example an impact press may generate noise not only because of the structural vibrations it produces but also because of the air it expels from between the impacting .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.