NVH ENGINEERING & TEST SERVICES
SOLUTION DEVELOPMENT

Roush specializes in integrating design, analysis and testing to develop innovative solutions to noise and vibration issues. With a focus on value, we frequently analyze a variety of solutions to optimize both effectiveness and cost. From the development of simple design changes to the manufacturing of noise and vibration control products, Roush provides both prototype and production solutions.

We are often called upon to eliminate a fatigue failure or reduce a product's noise level by 3-5 dba. We have been very successful in developing innovative solutions for a wide array of products. Examples can be found in the Solutions section of this website.

Source/Structural Modifications
Our primary objective is controlling the source of excitation by improving product designs to enhance structural dynamic properties. Excitation sources are also controlled by addressing part-to-part clearances (i.e., gears, bearings, etc.) and mechanical impacting, or by minimizing the mass of moving components. Sources of excitation frequently interact with structural dynamics to cause instabilities such as brake noise and machine tool chatter. We are experts in providing practical, effective solutions to these problems.

Damping
Effective damping methods require expertise in material properties and structural dynamics. The damping solutions developed by Roush can take on many forms, including:

- Free layer
- Constrained layer
- Laminated metal
- Tuned mass dampers
- Damping links
- Particle dampers
- Viscous absorbers
- Active absorbers

Isolation
Vibration isolation is often a practical, effective suppression technique, which breaks the path of noise and vibration by separating the source from the receiver. Effective isolation design requires an extensive knowledge of elastomer material properties, and can require our expertise in advanced analytical techniques to examine complex dynamics.

Acoustic Absorption/Barriers/Enclosures
To minimize reverberation and break the transmission path, acoustic materials can be strategically designed and applied for maximum acoustic absorption and transmission loss performance.

View Related Brochures

• Overview
• Vehicle NVH Engineering
• Powertrain NVH Engineering
• Transmission NVH Engineering
• Accessory NVH Engineering
• Brake noise engineering
• SEA modeling for acoustic prediction
• Aerospace NVH engineering
• Damper and vibration absorber engineering
• Vehicle sound package development
• Acoustic materials development
• Viscoelastic materials lab
• Design of Sound - Attenuation Treatments for Engine Covers
• Electric motor noise prediction

• SEA for Design: A Case Study
• A Technique for Relating Vehicle Structural Modes to Stiffness
• NVH Variations in Diesel Engine Populations
• Statistical Energy Analysis for Vehicle NVH Design: A Case Study
• Deriving SEA Trim Properties from APAMAT II Insertion Loss Measurements
• Measurement System for Acoustic Absorption Using the Cepstrum Technique
• Application of a Constrained Layer Damping Treatment to an Engine Front Cover
• Comparing Particle Dampers to Tuned Dampers
• Comparing 1-D and 3-D Analytical Modeling Methods for Airbox Design
• Applying Constrained Layer Damping to a Cast Aluminum Engine Cover
• Intro to Brake Noise Engineering
• Design Issues in the use of Elastomers in Automotive Tuned Mass Dampers
• An Interactive Approach to the Design of an Acoustically Balanced Vehicle Sound Package
• AutomotiveSound Absorbing Material Survey Results
• CAE Interior Cavity Model Validation using Acoustic Modal Analysis
• Application of the Modal Compliance Technique to a Vehicle Body in White
• Design and Construction of a Four-Wheel Drive Noise and Vibration Chassis Dynamometer
• Design of Folding Seat Tubs for NVH

NVH Engineering and Test Services Page