Vibration Test Articles on Environmental XPRT

Vibration testing of fuel probes

Aerial Refuelling The American Bell-Boeing V-22 Osprey is a multimission, military, tilt rotor aircraft with both a vertical and short takeoff and landing capability. It combines the functionality of a conventional helicopter with the high-speed cruise performance of a long-range turboprop aircraft. But even though it is long-range, some missions require in-flight refuelling. The V-22 Osprey can ...

Jun. 15, 2010

By Brüel & Kjær Sound & Vibration Measurement A/S

Ensuring satellite reliability with vibration testing

They offer space test and ground-based facilities where they design and build instruments, and analyse and process data. They also operate ground-station facilities, and lead conceptual studies for future missions. Working with space and ground-based groups around the world, they are now the largest space science department in Europe, and have been involved in over 150 missions in recent years, ...

May 1, 2013

By Brüel & Kjær Sound & Vibration Measurement A/S

Vibration testing of a carbon composite fuselage

This paper describes the details of an experimental investigation focusing on the vibration characteristics of a composite fuselage structure of an ultralight unmanned aerial vehicle (UAV). The UAV has a total empty weight of 70.3 kg and 6.3 m in length. The fuselage structure consists of the fuselage body with an integrated vertical stabiliser. All structural components are fabricated from ...

Nov. 8, 2010

By Inderscience Publishers

Vibration monitoring and analysis in aircraft engine test cells

Snecma, part of the SAFRAN group, is dedicated to the production of engines for both air and space. Working alone or in partnership, Snecma designs, develops and produces engines for civil and military aircraft, launch vehicles and satellites. The company is organised in three divisions: Commercial Engines – Snecma and GE Transportation team up to produce the bestselling family of CFM56 ...

Sep. 1, 2006

By Brüel & Kjær Sound & Vibration Measurement A/S

TRaC UK – LDS V984 vibration testing of fuel probes for the V22 Osprey

The Partnership Founded in 1934 as Flight Refuelling Limited (FRL), Cobham plc is a British manufacturing company based in Wimborne Minster, Dorset, England. It is organised into four core technology divisions – Mission Systems, Defence Systems, Avionics and Surveillance, and Aviation Services. The Cobham Mission Systems Division claims to be the world market leader for air-to-air ...

Dec. 9, 2010

By Brüel & Kjær Sound & Vibration Measurement A/S

Reduction of roof rack noise and vibration

The noise and vibration design of automotive add-on component roof rack was investigated. Different modification options were evaluated which include mounting location alteration, mounting damping change and material revision. Results from experimental modal analysis and sound pressure spectrum measurement in a wind tunnel indicate the direction of design modification for reduction of the roof ...

Nov. 8, 2010

By Inderscience Publishers

Chevy volt uses LDS vibration test system for electric vehicle battery durability tests

General Motors General Motors, one of the world’s largest automakers, traces its roots back to 1908. With its global headquarters in Detroit, GM employs 204,000 people in every major region of the world and does business in some 140 countries. GM and its strategic partners produce cars and trucks in 34 countries, and sell and service these vehicles through the following brands ...

Dec. 9, 2010

By Brüel & Kjær Sound & Vibration Measurement A/S

Damage identification based on vibration data

Structural damage identification, localisation and quantification is receiving attention world over. Developments in sensor technology, modal testing brought out immense technical advancements in modal–based damage detection methods. Advances in modal–based damage detection methods over the last few decades produced new techniques for examining vibration data for identification of structural ...

May 2, 2013

By Inderscience Publishers

A Device for the Measurement of Sub-Surface Ground Vibrations

A reliable measurement of free-field stress waves from transient loading has several important applications, for example, in the design of effective wave barriers to protect sensitive equipment and in the design of underground protective structures against explosive loading, to name a few. The characteristics of a stress wave are highly dependent on the energy source and the soil medium through ...

Sep. 1, 1996

By ASTM International

Application of particle damping for vibration attenuation in brake drum

The mechanism of noise of brake is very complex. A particle damper can be introduced without changing the shape of the structure and the addition of mass, and it may be applied in extreme temperature environments where most conventional dampers would fail. However, previous particle damper designs have been based on trial-and-error experimentation. In this paper, the feasibility of an application ...

Jun. 8, 2011

By Inderscience Publishers

Engine Testing

Engine testing involves measurement of rotating speed and torque of the engine by applying load controlled by a dynamometer connected to its output shaft. HORIBA has developed various types of dynamometer for the purpose of engine testing. They are mainly classified into two types; one is absorbing only dynamometer such as hydraulic dynamometers and eddy-current dynamometers, the other is ...

Feb. 8, 2010

By HORIBA Europe GmbH

Basic analytical modelling of the piston slap in conjunction with engine block vibration

The objective of this research is to enhance and develop analytical and experimental schemes to study the source and path analysis of piston slap noise and to develop tools to relate the piston slap to the engine block vibration. These computer tools solve the piston dynamics and the engine block vibration. The results of this approach are block vibrations that are comparable to experimental ...

Jan. 8, 2007

By Inderscience Publishers

Vibrations can have both negative and positive effects on the perception of sound

In a listening test participants were asked to rate their impression of product sound quality of truck sounds combined with steering wheel vibrations. The set-up also contained stimuli where one of two harmonics in the sound was suppressed, corresponding to the most salient peaks in the vibration spectrum. Sound and vibrations were rated as more annoying, tiring, rumbling and of lesser quality ...

Aug. 17, 2007

By Inderscience Publishers

Evaluation and reduction of steering column vibration of a rear wheel drive sedan

Vehicle noise, Vibration and Harshness (NVH) has become a key enabler for successful distinction between competitive vehicles because consumers have come to judge vehicle quality by NVH levels. One of many critical areas of NVH is the amount of vibration felt in the steering wheel as the customer drives the vehicle. This paper presents the evaluation of steering column vibration for a rear-wheel ...

May 11, 2004

By Inderscience Publishers

Firmness evaluation of melon using its vibration characteristic and finite element analysis

Analysis of the vibration responses of a fruit has been suggested as a non-destructive measure of its elastic properties (firmness). In this study, 'Huang gua' melons were excited using three types of balls (wooden, steel and rubber) and the vibration was detected by an accelerometer. The modulus of elasticity of the inner, middle and outer portions of melon flesh were determined using flat plate ...

Dec. 12, 2006

By Inderscience Publishers

The China job – largest vibrating screen for china amm 2006_2

Picture a vibrating screen that is 4.27m wide by 7.32m long and weighs 32.2 h tonnes without its isolation frame. I Then picture constructing two such behemoths and shipping them to a coal mine in China and commissioning them within a light delivery schedule. This is what Jocst Australia, a subsidiary of Jcist GmbH & Co KG of Germany, has done. It was hired to build two large double- deck ...

Jan. 1, 2006

Vibration-based approach to lifetime prediction of electric motors for reuse

This paper is concerned with lifetime prediction of components in washing machines. Vibration signals were measured on electric motors during an accelerated lifetime test ranging from 26.7 to 38.5 simulated years. Loose bearings have initiated air-gap eccentricity and rotor-to-stator rubbing, which resulted in a motor breakdown. Significant frequency bands were identified using a spectral ...

Feb. 16, 2010

By Inderscience Publishers

Optimisation of whole body vibration analysis for suspended cabin tractor semitrailer

This work has been conducted to find out the health risk associated with suspended cabin tractor semi–trailer driving work. Suspended cabin tractor semi–trailer drivers are exposed to whole body vibration (WBV) during their work. Some drivers suffer from low back pain caused by vibration. The practical significance of applying suspended cabin type of tractor semi–trailer was tested at different ...

Apr. 10, 2012

By Inderscience Publishers

Predicting noise, vibration and harshness performance degradation through fatigue analysis

Vehicle performance from a noise, vibration and harshness (NVH) perspective is typically evaluated at zero mileage. As the vehicle accumulates miles, systems that are considered as NVH sources and systems that are part of a noise and vibration path tend to see some degradation due to loosened joints, burnished gears, burnished bearings, etc. Up to date, efforts made to understand and predict NVH ...

Apr. 2, 2009

By Inderscience Publishers

Vibration isolation for engine mount systems using an active hybrid robust controller

In this paper, a hybrid robust controller is proposed for reducing vibration on single input/single output (SISO) and multiple input/multiple output (MIMO) engine mount systems. The controller is designed to achieve robust stability and fast convergence by using a combination of the filtered-x least mean squares (FXLMS) and H∞ robust control methods. Plant response is identified by a ...

Aug. 3, 2005

By Inderscience Publishers

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