Automotive Applications For Noise Vibration And Vibration

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Automotive Applications for Noise, Vibration and Harshness

Project Report on
EMERGENCY VEHICLE SIREN NOISE

85-525
Department of Mechanical, Automotive and Materials Engineering
University of Windsor

Submitted To: Dr. Colin Novak

Prepared By:
Deeksha Vashisht (104142091)
Wenjun Hu (104014572)
Sambath Kumaar Balasubramanian Thangamani (104123898)

DATE: November 09, 2014
Table of Contents
ABSTRACT: 3
1. INTRODUCTION: 3
2. WHAT IS EMERGENCY VEHICLE SIREN NOISE (EVSN)? 4
HISTORY: 4
WORKING: 4
3. TYPES OF SIRENS USED ON EMERGENCY VEHICLES: 5
4. TYPES OF SIREN TONES USED IN EMERGENCY VEHICLES 5
5. SIREN CHARACTERISTICS: 6
6. PERCEIVED URGENCY 6
7. SHADOWING DUE TO VEHICLES OR BARRIERS ON ROAD 6
8. NOISE CONTROL FACTORS 7
9. MASKING OF
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As a result, an increasing number of vehicles have sound-proof design and acoustic surrounding systems. However, when those in-car appliances operate simultaneously, it can be difficult for drivers to detect the approach of emergency vehicles such as ambulances, police, and fire-fighting trucks. This is one of the reasons why most accidents between emergency vehicles and motorists happen at intersections [1]. Those collisions impede the emergency service travels from reaching the destinations on time. In the United States, it is claimed that the most frequent emergency service cases were about emergency vehicle crashes and patient handing mishaps [2].
Even though the emergency vehicles have implemented visual device, the visual warning mechanism cannot take effect if the receivers are not facing towards the vehicle. Many collision incidents indicate that drivers did not recognize the coming emergency vehicles with flashing lights and they delayed the reflection of clearing roads in urban area [3]. It is not constrained to elderly or hearing impaired drivers. Therefore, the audible warning siren is important to prevent collisions which are caused by drivers not responding to the sign of warning from emergency travel.
Due to the improvement of in-car sound control design mentioned above, the siren can be difficult to penetrate into the cabin of a vehicle when the distance is greater than 8-12 m [4]. Tests were conducted to improve the audibility
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