vehicle noise test Articles

  • MIRA Ltd., EU noise directive testing

    The Company Vehicle engineering specialist, MIRA, is a leading design, development and certification consultancy delivering engineering solutions from individual tests to turnkey vehicle design programmes. MIRA’s customers include vehicle manufacturers and equipment suppliers across the automotive, defence, aerospace and rail sectors. Around 400 dedicated employees, ...

  • In-situ noise level mapping for vehicle floor carpet

    Noise level mapping of test vehicles' floor carpets was undertaken for three frequency bands, that is, low-(2,000 Hz) to compare noise control treatment performance and effectiveness. On-road tests including idling conditions and constant speed tests of 40, 60 and 80 kph were undertaken. Noise level contour maps indicate that the luxury class test vehicle ...


    By Inderscience Publishers

  • Rating criteria for vehicle in-cabin noise with emphasis on HVAC system operation

    Noise and vibration have an important influence on a customer's perception of vehicle quality. It is the purpose of this study to introduce a standard test procedure for measuring vehicle in-cabin noise levels. A combined vehicle base noise with all possible sources, including HVAC system, tyres, aerodynamics, under various driving conditions, is considered for developing the total vehicle cabin ...


    By Inderscience Publishers

  • Investigation into noise problems in vehicle structure using vibro-acoustic approach

    The main focus of this paper is the study of the relationship between components of vibration and noise inside the passenger cabin of a production vehicle. The noise inside automobiles is largely composed of contributions from the engine, ground and wind. The engine and tyres successively transfer the vibration via the structural connections to the body panels, which then propagates through the ...


    By Inderscience Publishers

  • The evaluation of speech intelligibility in a simulated driving environment using the hearing in noise test

    The implementation of the hearing in noise test (HINT) was carried out using an NVH driving simulator in order to evaluate the speech intelligibility in a car between driver and passenger for a variety of driving speeds and the configurations of the talker and of the listener. The sentence reception threshold (sSRT) was determined for each of the various communication situations. When presented ...


    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 ...


    By HORIBA Europe GmbH

  • Brake Test Systems

    For quality assurance and technical refinement of brakes, which are of course highly important for vehicle safety, the brake R&D engineering community makes extensive use of a variety of dedicated brake test systems. For example, a friction tester can evaluate wear-behaviour and friction coefficient of materials and is utilized for managing the production quality of such materials. An inertia ...


    By HORIBA Europe GmbH

  • 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 ...


    By Inderscience Publishers

  • Noise measurement in the fast lane! - case study

    Due to the nature of the Vehicle and Operator Services Agency (VOSA) work, noise is an inevitable by-product of its daily activities. Consequently to ensure the welfare of both its staff and the community in which it operates, VOSA undertakes regular noise assessments to ensure that the relevant regulations are being adhered to, thereby protecting both the environment in which it operates as well ...


    By Cirrus Research plc

  • Suzuki Wind Tunnel used for full-vehicle noise source identification case study

    The Suzuki name can be seen on a full range of motorcycles, automobiles, outboard motors, and related products and is recognised throughout the world for quality products offering both reliability and originality. And Suzuki is always creating advanced ‘value-packed products’ for their customers. So, in 2006, as one of their investments, Suzuki’s R&D division built a new ...

  • In situ identification of vehicle engine inertia properties

    A direct system identification method for vehicle engine rigid body inertia properties based on in situ measurements is presented in this work. One of the advantages of this method is the use of acceleration response measurements obtained from standard NVH tests performed on a vehicle. Since there is no need to separate the engine, there will be a considerable reduction in time required for ...


    By Inderscience Publishers

  • Measuring Noise Outdoors

    In recent weeks, we have received a number of calls asking for our recommendations on semi-permanent systems for measuring noise outdoors. Well, if you are specifically looking for a data logging integrating averaging sound level meter to undertake your environmental, vehicle ...


    By Pulsar Instruments Plc

  • Key Technology of Unmanned Underwater Vehicle

    1. Overall Technology Underwater UAV is a highly technology-intensive and systematic project, involving dozens of professional disciplines. Each discipline restricts each other. Purely pursuing a single technical index, one will lose sight of the other. To solve these contradictions, we need to strengthen coordination in addition to a strong system concept. On the premise of meeting the overall ...

  • 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 ...


    By Inderscience Publishers

  • Power-fold actuator noise diagnostics using statistical envelope analysis

    A good correlation between subjective evaluation and objective test is a key for any machine condition monitoring and fault diagnosis process. This paper proposes a statistical envelope analysis approach for product quality control where Fourier spectrum is selected as diagnosis analysis characteristics. The acceptance amplitude envelope is statistically calculated from the measured random ...


    By Inderscience Publishers

  • Urban Noise Monitoring in Madrid

    Dynamic mapping helps Madrid improve the quality of life for her citizens and visitors alike. With its 3 000 000 inhabitants and 2500 km of streets, Madrid is an excellent example of what can be done to improve human comfort related to urban noise. Since the late 60s, Madrid City Council has been working on noise problems. During this period, global environmental analysis has focused on how ...

  • Optimisation of engine mounting systems using experimental FRF vehicle model

    Engine and body mount systems play a crucial role in vehicles' comfort. Engine mounts protect the engine from excessive movement and forces due to low frequency road and high frequency engine excitations. On the other hand, body mounts protect the cabin from vibration forces exerted by the body. Normally, a complete set of mounts is conceived at early stages of design, subsequently the set is ...


    By Inderscience Publishers

  • Simulation tool for shock absorber noise prediction in time and frequency domains

    This paper investigates the validity of a hydraulic simulation model to calculate the piston rod acceleration for further frequency domain analysis. At the present time, simulation results analyses of shock absorber characteristics are mostly restricted to the low frequency range for the hydraulic behaviour and the high frequency range for Noise, Vibration and Harshness (NVH) studies. However ...


    By Inderscience Publishers

  • A model and experimental investigation of belt noise in automotive accessory belt drive system

    This paper presents a model to characterise V-ribbed belt (Micro-VTM) noise in accessory belt drive system (ABDS), or front-end accessory drive (FEAD) of automotive engines. It has been known that radial friction-induced vibrations generate belt misalignment noise and tangential friction-induced vibrations relates to belt slip noise. In this study, these two kinds of vibrations are found ...


    By Inderscience Publishers

  • Noise monitoring - are you prioritising it at work?

    Hearing loss is a frequent complaint which can affect individuals’ quality of life significantly. We all know someone who suffers from it and maybe take it as something that can be expected depending on the age or the type of work carried out over a long career.  Noise-induced hearing loss is often ignored and remains a forgotten industrial disease despite continued efforts to ...


    By Pulsar Instruments Plc

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