Searched for: subject%3A%22Vibrations%255C%2B%255C%2528mechanical%255C%2529%22
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Thompson, D. (author), Squicciarini, G. (author), Zhang, J. (author), Lopez Arteaga, I. (author), Zea, E. (author), Dittrich, M.G. (author), Jansen, H.W. (author), Arcas, K. (author), Cierco, E. (author), Magrans, F.X. (author), Malkoun, A. (author), Iturritxa, E. (author), Guiral, A. (author), Stangl, M. (author), Schleinzer, G. (author), Martin Lopez, B. (author), Chaufour, C. (author), Wändell, J. (author)
The noise produced during a train pass-by originates from several different sources such as propulsion noise, noise from auxiliary equipment, aerodynamic noise and rolling noise. The rolling noise is radiated by the wheels and the track and is excited by the wheel and rail unevenness, usually referred to as roughness. The current TSI Noise...
article 2018
document
Berkhoff, A. (author), Tajdari, F. (author)
This paper presents a method to realize an acoustic source for low frequencies with relatively small thickness. A honeycomb plate structure which is open on one side combines the radiating surface and the major part of the air cavity. The vibration of the plate is controlled with a decentralized feedback controller. The fundamental resonance...
conference paper 2017
document
van Beek, P.J.G. (author), Pereboom, H.P. (author), Slot, H.J. (author)
Prior to subsea installation, a subsea system has to be tested to verify whether it performs in accordance with specifications and component specific performance evaluation criteria. It is important to verify that the assembled components work in accordance with the assumptions and design criteria used in the detailed engineering. These criteria...
conference paper 2016
document
Galanti, F. (author), Heinemeyer, C. (author), Feldmann, M. (author), Lentzen, S. (author)
To achieve flexibility with regard to space-arrangement and occupancy, multi-storey buildings require large span floor structures with a minimum of internal columns and walls. Modern materials and methods of construction are becoming more and more suitable to fulfill these requirements. It is common for the design of slender floor structures to...
conference paper 2011
document
Golliard, J. (author), Tonon, D. (author), Belfroid, S.P.C. (author)
The goal of this study is to investigate the issue of the aeroacoustic source location within corrugated pipes. A configuration with a short pipe and well defined boundary conditions has been chosen, in order to have a precise knowledge of the distribution of the acoustic velocity and pressure within the pipe. The source locations have been...
conference paper 2010
document
Belfroid, S.P.C. (author), Cargnelutti, M.F. (author), Schiferli, W. (author), van Osch, M.M.E. (author)
To be able to assess the mechanical integrity of piping structures for loading to multiphase flow conditions, air-water experiments were carried out in a horizontal 1" pipe system. Forces and accelerations were measured on a number of bends and T-joint configurations for a wide range of operating conditions. Five different configurations were...
conference paper 2010
document
de Kraker, H. (author), de Korte, E. (author), van Mil, F. (author), Rijs, B. (author), Bongers, P. (author), TNO Kwaliteit van Leven (author)
The aim of this study was to determine the effect of a tactile feedback signal on hovering behaviour, productivity, usability and comfort after 1 week of using an experimental mouse. In a randomized controlled trial, a regular computer mouse was compared to a new developed mouse with a tactile, vibrating feedback signal to prevent unnecessary...
article 2008
document
van Erp, J.B.F. (author), van Veen, H.A.H.C. (author), Ruijsendael, M. (author), TNO Defensie en Veiligheid (author)
Data show that spatial orientation in microgravity differs from that on Earth possibly facilitating space motion sickness and degrading performance. As a technology demonstration, we developed a Tactile Orientation Awareness Support Tool (TOAST) consisting of a vest with 56 vibrators. TOAST presents an artificial gravity vector by a localised...
article 2007
document
TNO Defensie en Veiligheid (author), de Wit, J.J.M. (author), van Rossum, W.L. (author), Otten, M.P.G. (author)
Phased array antennas are increasingly used in modern radar systems. Such systems are very liable to distortion of the relative phases between the radiating elements. For airborne, spaceborne, and naval phased array systems, vibrations of the array structure are an important source of phase distortions. In this paper, a system concept will be...
conference paper 2007
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Monk-Steel, A.D. (author), Thompson, D.J. (author), de Beer, F.G. (author), Janssens, M.H.A. (author), TNO Industrie en Techniek (author)
Curve squeal noise is of growing concern for the railway industry as rail systems become more widespread in densely populated areas. In response to the pressure to minimise environmental pollution, there is a demand for a deeper understanding of the phenomenon and to develop a methodical approach to managing the wheel-rail system. Under curving,...
article 2006
document
Habing, R.A. (author), Peters, M.C.A.M. (author), TNO Industrie en Techniek (author)
This paper presents an experimental method for validating traditional compressor valve theory for unsteady flow conditions. Traditional valve theory considers the flow force acting on the plate and the flow rate as quasi-steady variables. These variables are related via semi-empirical coefficients which are determined by steady flow experiments....
article 2006
document
TNO Industrie en Techniek (author), van Veggel, M. (author), Wielders, A.A. (author), van Brug, H. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author)
The GAI A satellite will make a 3-D map of our Galaxy with measurement accuracy of 10 microarcseconds using two astrometric telescopes. The angle between the lines-of-sight of the two telescopes will be monitored using the Basic Angle Monitoring system with 1 microarcsecond accuracy. This system will be an interferometer consisting of a number...
conference paper 2005
document
Miedema, H.M.E. (author), Vos, H. (author), Instituut voor Ruimtelijke Organisatie TNO (author)
Relationships between exposure to noise [metric: day-evening-night levels (DENL)] from stationary sources (shunting yards, a seasonal industry, and other industries) and annoyance are presented. Curves are presented for expected annoyance score, the percentage "highly annoyed" (%HA, cutoff at 72 on a scale from 0 to 100), the percentage "annoyed...
article 2004
document
Dittrich, M.G. (author), Janssens, M.H.A. (author), Technisch Physische Dienst TNO - TH (author)
Some of the issues related to railway noise type testing are discussed and potential improvements to existing procedures are put forward. New and improved methods that also go beyond the scope of type testing are presented that help to characterize and analyze rolling noise more accurately. These methods are indirect measurement of total wheel...
article 2000
document
de Beer, F.G. (author), Verheij, J.W. (author), Technisch Physische Dienst TNO - TH (author)
Pass-by noise from freight trains on straight tracks is dominated by rolling noise. The main contributions are generally accepted to originate from vibrations of the track and the wheels. However, there is uncertainty about the contributions from the bogie and the wagon superstructure. This article describes experimental methods to determine...
article 2000
document
TNO Bouw (author), Metrikine, A.V. (author), Wolfert, A.R.M. (author), Vrouwenvelder, A.C.W.M. (author)
Steady-state vibrations of periodically supported structures under a moving load are analytically investigated. The following three structures are considered: an overhead power line for a train, a long suspended bridge and a railway track. The study is based on the application of so-called `periodicity condition', which implies that the shape of...
article 1999
document
Vincent, N. (author), Bouvet, P. (author), Thompson, D.J. (author), Gautier, P.E. (author), Technisch Physische Dienst TNO - TH (author)
The control of railway rolling noise requires a reduction in wheel and track noise emission. In this paper, a parametric study of the possible minimization of the track sound power is presented. In an initial global approach, a number of potential variations in track parameters are assessed in terms of their likely effect on rolling noise. From...
article 1996
document
Thompson, D.J. (author), Fodiman, P. (author), Mahé, H. (author), Technisch Physische Dienst TNO - TH (author)
Two extensive measurement campaigns have been carried out to validate the TWINS prediction program for rolling noise, as described in part 1 of this paper. This second part presents the experimental results of vibration and noise during train pass-bys and compares them with predictions from the TWINS program. The model is found to give quite...
article 1996
document
de Jong, R.G. (author), Miedema, H.M.E. (author), TNO Preventie en Gezondheid (author)
In the Netherlands a new freight-only railway route, the "Betuweroute", is being planned to carry freight traffic from Rotterdam harbour east into Germany. Inhabitants of areas near the future route are concerned about noise and vibration, and question the relevance of current legislation for a "freight-only" line. An analysis of field surveys,...
article 1996
document
Eijk, A. (author), Egas, G. (author), Smeulers, J.P.M. (author), Technisch Physische Dienst TNO - TH (author)
In systems with large reciprocating compressors, so-called compressor manifold vibrations can contribute to fatigue failure of the pipe system. These vibrations are excited by pulsation-induced forces and by forces generated by the compressor. This paper describes an advanced and accurate method for predicting vibration levels and cyclic...
article 1996
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