noise and vibration Articles
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Noise and vibration design by the TRIZ method
The purpose of the present study is to obtain improved solutions to noise and vibration (NV) problems in the product development process. Conventional textbooks and technical papers on NV control almost always describe analysis methods or case studies only. The study is an attempt to find a systematic method by which to provide hints to engineers to generate NV solutions. The method developed ...
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Technological methods for noise/vibration reduction in driveline/transmission of trucks and all-wheel-drive vehicles
The paper is targeting solution to the problem of noise/vibration reduction in driveline/transmission of a truck and all-wheel-drive vehicle. It is customary to modify the gear micro-geometry to accommodate misalignment and minimise transmission error in a truck transmission. Various possible kinds of modification of a pinion tooth surface are considered. Topological modification of a pinion ...
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Overview of automotive noise and vibration
Vehicle noise, vibration and harshness (NVH) is an important vehicle attribute. It is usually among the top five attributes in terms of its priority in the design of any vehicle type. Like other attributes of safety, performance, dynamics and fuel economy, this attribute has to be considered closely in the design process. This manuscript presents an overview of automotive NVH engineering. It ...
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Computational method for predicting the effects of vibrations to acoustical comfort in vehicle cabin
One of the main features that attract the customer to purchase a vehicle is the vehicle acoustical and vibration comfort in the vehicle cabin. The exposed noise and vibration will affect the driver's performance in a way that the noise and vibration will distract their vision, which altogether will be stressful to the driver and passenger. Based on previous studies, vibrations are contributed by ...
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Recent research on vehicle noise and vibration
Vehicle noise, vibration and harshness (NVH) is usually among the top five attributes in terms of its priority in the design of automotive vehicles. Its priority in other types of vehicles (e.g., aerospace) is also important. Like other attributes of safety, performance, dynamics, fuel economy, NVH has to be considered closely in the design process. This manuscript presents a summary of recent ...
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Improving powerplant and powertrain bending in East-West engine configurations
Once installed, the powertrain experiences a natural resonance that is usually referred to as the powerplant (and/or powertrain) bending. Such resonance manifests itself into noise, vibration, and harshness (NVH) concerns at the customer level. It also causes higher levels of amplitudes of the dynamic deformation and stresses leading to durability concerns. This paper addresses powertrain bending ...
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The influence of combined environmental stimuli on the evaluation of acoustical comfort: case studies carried out in an interactive simulation environment
In automobiles, the perceived acoustical comfort is dependent on the vibro-acoustic exposure. To meet the customers' demands, acoustic engineers are asked for the optimisation of the vehicle's noise and vibration at early stages of the development. However, the task can only be adequately carried out if the interaction of noise and vibration and its impact on drivers' evaluations are well-known. ...
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Noise and Vibration Study in Guinea
A principal WKC consultant recently visited the Republic of Guinea as part of a multi-disciplinary team acting on behalf of AngloGold Ashanti, a global leader in gold production. WKC is undertaking a specialist noise and vibration assessment to support a feasibility study to exploit hard rock material and extend the life of the Siguiri mine. The operations of Société Anglogold ...
By WKC Group
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Multidisciplinary optimisation of a car component under NVH and weight constraints using RSM
One of the important challenges in the auto industry is to reduce the mass of the vehicle while meeting structural performance requirements for crashworthiness, noise, vibration and harshness, etc. In this paper, a multidisciplinary optimisation of a car back-bonnet is investigated by using the response surface method. A car body is fully surface modelled in CATIA and meshed in software. Then, ...
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Optimisation of acoustical comfort in vehicle cabin using the goal programming
Car cabin acoustical comfort is one of the main features that may attract customers to purchase a new vehicle. The noise in a passenger car cabin is closely related to the vibration generated in the vehicle system. In this study, the effects of vibration on noise in the passenger car cabin have been studied. The vehicle acoustical comfort index (VACI) was used to evaluate the noise annoyance ...
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A survey of wheel tyre cavity resonance noise
Noise, vibration, and harshness (NVH) are synonymous with quality factor in automotive engineering. This quality factor is influenced by the internal noise such as engine noise, and external noise such as aerodynamic noise and tyre–road noise. Whereas many studies have been done to identify noise sources and reduce the noise and vibration transmission from the engine and aerodynamic sources to ...
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Controlling combustion noise in direct injection diesel engine through mechanical vibration measurement
The next generations of direct injection diesel engines have greatly improved their performances compared with petrol engines. However, one of the pending subjects is the noise and vibration levels, due to working cycle itself. The design effort to reduce the emissions of noise and vibration transmitted to the vehicle's driver could be lessened because of the assembly process variation. In this ...
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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 ...
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A study of tyre, cavity and rim coupling resonance induced noise
The tyre cavity resonance induced noise and vibration currently have no effective mass production solutions. All proposed solutions are hard to service and difficult to maintain. Different analysis approaches are presented in this paper to verify computer simulation models. Modal analysis results of the tyre cavity, tyre and rim structures were compared and a complex nature of tyre cavity ...
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Pulsar Christmas opening times
Season’s Greetings and a Happy New Year Pulsar Instruments wishes all our customers, friends and followers season’s greetings and best wishes for a happy new year. Our office will be closed over the holiday period from Monday 24 December 2018 to Wednesday 2 January 2019, but our Noise Shop is open 24/7 and we will be back in the New Year to help you all with your noise and vibration ...
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NVH characteristics of thermoplastic composite engine covers
Thermoplastic composites have been increasingly used for automotive under-the-hood applications, like engine covers. To compete with other lightweight materials, such as aluminium and magnesium, the thermoplastic composite has to demonstrate sound structural performance, such as long-term durability and noise, vibration and harshness (NVH) performance. In the current study, the NVH ...
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Athlone Cooling Towers Demolition, Cape Town, South Africa Case Study
The Athlone Cooling Towers in Cape Town, South Africa, were condemned due to structural damage caused by the heavy Cape winds. A decision was taken to demolish the Cooling Towers, despite the technical challenges and potential risk to nearby populations that this posed. In 2011, Knight Piesold was appointed as project manager to assist with the demolition of the Athlone Cooling Towers, by the ...
By WKC Group
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Effective NVH analysis and optimisation with CAE and computer experiments
Computer experiments have been widely used in many industrial applications including Noise, Vibration and Harshness (NVH). So far, selecting the proper computer experiment to be used for a given NVH study has been done in an arbitrary manner. We offer a guideline computer experiment selection based on complexity level of the system under consideration. This report focuses on four different types ...
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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 ...
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Experimental investigation of power-assisted steering pump noise for housing material change from cast iron to aluminium
Noise and vibration have an important influence on a customer's perception of vehicle quality. In this research, the major power-assisted steering pump noise propagation mechanism is determined. Noise and vibration comparison tests have been completed for subjectively good and bad cast-iron housed pumps, as well as for an aluminium housed pump. Decoupling tests for the steering rack disconnected ...
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