Investigation of Passive Control Devices for Potential Application to a Launch Vehicle Structure to Reduce the Interior Noise Levels During Launch

2006 ◽  
Author(s):  
Carl Q. Howard ◽  
Colin Hansen
Keyword(s):  
Potential Application ◽  
Passive Control ◽  
Launch Vehicle ◽  
Interior Noise ◽  
Noise Levels ◽  
Vehicle Structure ◽  
Control Devices

Vibration Absorbers: A Review of Applications in Interior Noise Control of Propeller Aircraft

2004 ◽  
Vol 10 (8) ◽  
pp. 1221-1237 ◽  
Author(s):  
R. I. Wright ◽  
M. R. F. Kidner
Keyword(s):  
Passive Control ◽  
Noise Control ◽  
Large Body ◽  
Research Area ◽  
Interior Noise ◽  
Vibration Absorbers ◽  
Noise Levels ◽  
Active Systems ◽  
Significant Research ◽  
Fruitful Research

Control of interior noise levels in aircraft has been a significant research area over the last two decades. Vibration absorbers have often been researched as more efficacious solutions to this problem than absorbent blankets or fully active systems. In this paper we review the large body of work performed in this field and we offer an indication of the remaining areas for fruitful research. Surprisingly few installations of vibration absorbers for interior noise control have been realized, and we believe this is due to the pervasive belief in industry that vibration absorbers can only be applied to control resonant, not forced behavior in a structure. The potential of adaptive passive control using vibration absorbers has been shown by many researchers, and we believe that this direction may yield several practical solutions to the problem of interior noise in aircraft.

Effect of an Isolated Shell on Interior Noise levels in a Turboprop Aircraft

1989 ◽  
Author(s):  
Ramasamy Navaneethan ◽  
Robert L. Howes
Keyword(s):  
Interior Noise ◽  
Noise Levels

Design Optimization of Polyurethane Cored Three-Layered Carpeting

1994 ◽  
Vol 208 (3) ◽  
pp. 175-180 ◽  
Author(s):  
M K Ling
Keyword(s):  
Design Optimization ◽  
Control Systems ◽  
Single Unit ◽  
Noise Control ◽  
Interior Noise ◽  
Performance Characteristics ◽  
Design Model ◽  
Noise Levels

Multi-layered noise control systems are widely used in production vehicles to reduce interior noise levels. Traditionally, these systems had fibrous felt cores but increasingly moulded polyurethane (PUR) foam-backed carpets are now used. They provide the manufacturer with a single unit moulded car carpet, enabling easy and cheaper installation. However, little information has been published on their performance characteristics or their design optimization. This paper reports on work that examines the optimization of composite performance of these composites. A design model is developed which allows performance to be assessed before expensive road trials are carried out.

Assessment of Lightweight Automotive Glass Solutions on Interior Noise Levels & amp; Sound Quality

2017 ◽  
Author(s):  
Todd Tousignant ◽  
Kiran Govindswamy ◽  
Vikram Bhatia ◽  
Shivani Polasani ◽  
W Keith Fisher
Keyword(s):  
Sound Quality ◽  
Interior Noise ◽  
Noise Levels

scholarly journals Vibration Control Devices for Building Structures and Installation Approach: A Review

2019 ◽  
Vol 29 (2) ◽  
pp. 74-100 ◽  
Author(s):  
Waseem Sarwar ◽  
Rehan Sarwar
Keyword(s):  
Energy Dissipation ◽  
Vibration Control ◽  
Passive Control ◽  
Search Algorithm ◽  
Structural Response ◽  
Building Structures ◽  
Analysis And Design ◽  
Control Devices ◽  
Energy Dissipation Devices ◽  
Energy Absorbing

Abstract Retrofit and structural design with vibration control devices have been proven repeatedly to be feasible seismic hazard mitigation approach. To control the structural response; supplemental energy dissipation devices have been most commonly used for energy absorption. The passive control system has been successfully incorporated in mid to high rise buildings as an appropriate energy absorbing system to suppress seismic and wind-induced excitation. The considerable theses that are highlighted include vibration control devices, the dynamic behavior of devices; energy dissipation mechanism, devices installation approach and building guidelines for structural analysis and design employing vibration control devices also, design concern that is specific to building with vibration control devices. The following four types of supplemental damping devices have been investigated in this review: metallic devices, friction devices, viscous fluid devices, and viscoelastic devices. Although numerous devices installation techniques available, more precisely, devices installation approaches have been reviewed in this paper, including Analysis and Redesign approach (Lavan A/R), standard placement approach, simplified sequential search algorithm, and Takewaki approach.

scholarly journals Cable Vibrations in Cable-Stayed Bridges

2007 ◽  
Author(s):  
Elsa de Sá Caetano
Keyword(s):  
Passive Control ◽  
Direct Action ◽  
Case Reports ◽  
Present Book ◽  
Wind Vibration ◽  
Wake Effects ◽  
Comprehensive Survey ◽  
Control Devices ◽  
Cable Vibrations ◽  
Cable Stayed Bridges

<p>The fifty years of experience of construction of cable-stayed bridges since their establishment as a new category among the classical types have brought an immense progress, ranging from design and conception to materials, analysis, construction, observation and retrofitting. The growing construction of cable-stayed bridges has also triggered researchers’ and designers’ attention to the problem of cable vibrations. Intensive research has been developed all over the world during the last two decades as a consequence of the numerous cases of cable vibrations exhibited by all types of cable-stayed bridges.<p>Despite the increased knowledge of the various vibration phenomena, most of the outcomes and research results have been published in journals and conference proceedings and scarce information is currently provided by the existing recommendations and codes. <p>The present book provides a comprehensive survey on the governing phenomena of cable vibration, both associated with direct action of wind and rain: buffeting, vortex-shedding, wake effects, rain-wind vibration; and resulting from the indirect excitation through anchorage oscillation: external and parametric excitation. Methodologies for assessment of the effects of those phenomena are presented and illustrated by practical examples. Control of cable vibrations is then discussed and state-of-art results on the design of passive control devices are presented. <p>The book is complemented with a series of case reports reflecting the practical approach shared by experienced designers and consultants: Yves Bournand (VSL International), Chris Geurts (TNO), Carl Hansvold (Johs. Holt), Allan Larsen (Cowi) and Randall Poston (WDP & Associates).

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