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Development of experimental device for Compression Load Deflection of Car Door Seals

Journal of Donghua University(English Edition) 2003年第2期20卷 116-121页

作者：赵建才朱训生万德安 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 Department of Mechanical Engineering Tongji University Shanghai 200092 new experimental device has been developed for analyzing compression load deflection of the door seal by using stereovision theory. Precision instruments of optical grating and force sensor are also integrated in this device. Force-displacement response characteristics of compression at varied speed can be controlled. Solid foundations for characteristic and structure as well as optimization design of the car door seal are elucidated.

A new experimental device has been developed for analyzing compression load deflection of the door seal by using stereovision theory. Precision instruments of optical grating and force sensor are also integrated in this device. Force-displacement response characteristics of compression at varied speed can be controlled. Solid foundations for characteristic and structure as well as optimization design of the car door seal are elucidated.

关键词： experimental device compression load deflection seals

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Investigation of experimental devices for Finger Active and Passive Tactile Friction Analysis

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 129-139页

作者： Xue Zhou Marc A.Masen Jiliang Mo Xinyu Shi Yaosheng He Zhongmin Jin Tribology Research Institute Southwest Jiaotong UniversityChengdu 610031China Tribology Group Department of Mechanical EngineeringImperial College LondonLondon SW72AZUK Inteliot Shengzhen 518052China School of Mechanical Engineering University of LeedsLeeds LS29JTUK

Complicated tribological behavior occurs when human fingers touch and perceive the surfaces of *** this process,people use their exploration style with different conditions,such as contact load,sliding speed,sliding direction,and angle of orientation between fingers and object surface consciously or *** work addressed interlaboratory experimental devices for finger active and passive tactile friction analysis,showing two types of finger *** active sliding experiment,the participant slid their finger freely against the object surface,requiring the subject to control the motion conditions *** passive sliding experiments,these motion conditions were adjusted by the *** analysis parameters,such as contact force,vibration acceleration signals,vibration magnitude,and fingerprint deformation were recorded *** friction differences were observed when comparing active sliding and passive *** passive sliding,stick-slip behavior occurred when sliding in the distal direction,evidenced by observing the friction force and the related deformation of the fingerprint *** employed devices showed good repeatability and high reliability,which enriched the design of the experimental platform and provided guidance to the standardization research in the field of tactile friction.

关键词： Finger friction experimental device Active sliding Passive sliding Rotating

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Morphological and mechanical analysis of natural marble joints submitted to shear tests

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Journal of Rock Mechanics and Geotechnical Engineering 2012年第4期4卷 296-311页

作者： M.Gasc-Barbier T.T.N.Hoang A.Marache J.Sulem J.Riss Laboratoire Régional des Ponts et Chaussées Université de Bordeaux Talence Cedex UR Navier CERMESécole Nationale des Ponts ParisTech

In order to evaluate the influence of the surface morphology on the mechanical behavior of twelve natural marble joints, very accurate topography measurements of joint surfaces under constant normal load （CNL） conditions were performed before and after shear tests. The surface topography was carried out using a three-dimensional （3D） laser-scanning profilometer with a parallel grid at a regular interval of 500 gin. Each surface before shearing was reconstructed by geostatistical methods according to eight different directions. A quantitative description of surfaces was performed using global and directional statistical parameters. These parameters allow to determine the surface anisotropy and to divide the .joints into three groups of similar morphology according to a given direction. Each sample of the same group is submitted to the same normal stress but to different shear rates ranging from 5 to 20 gm/s. The influences of normal stress and shear rate on the mechanical behavior of the discontinuities were investigated, as well as the influence of the sample morphology on its dilatancy behavior. The morphology data of upper and lower walls also permit to quantify the contact areas before testing. After the shear tests, sheared surfaces were scanned again and reconstructed according to the shearing direction. Based on the topography data of joint surfaces obtained before and after shearing, damage zones that occurred during shearing were located for both walls of each .joint. These characterizations of joint surfaces contribute to a better understanding of the shearing behavior of natural discontinuities.

关键词： rock joints morphological analysis mechanical behavior experimental device roughness

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Contribution to the Study of the Influence of the experimental Set-Up on the Vaporization Process of Vegetable Oil Droplets

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Open Journal of Fluid Dynamics 2024年第4期14卷 224-241页

作者： Sampawinde Augustin Zongo Jacques Nébié Téré Dabilgou Soutongnoma Bouda Tizane Daho Laboratoire de Physique et de Chimie de l'Environnement (LPCE) Dpartement de Physique Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Dpartement de Physique Universit Thomas SANKARA Ouagadougou Burkina Faso Centre Universitaire de Ziniar Universit Joseph KI-ZERBO Ziniar Burkina Faso

This study presents a contribution to the development of a model for vegetable oil droplets vaporization, with a particular focus on the influence of the experimental set-up for their use as fuel in diesel engines. Two systems were considered: an open-environment system obtained through a hot gas flow, and a closed-environment system. Vaporization was conducted under identical conditions, with the results subsequently compared. The findings indicate that, for temperatures between 473 K and 673 K, droplets behaviour in both systems presents only a heating and expansion phase. For temperatures above 673 K, the behaviour of the droplets differs between the devices. In the open environment device, a linear reduction in droplets diameter is observed following the transient phase, suggesting stationary vaporization and enabling the calculation of a vaporization constant and the well-known D2 law is respected. In the closed-environment device, puffing, micro-explosions and gas ejections are observed, and it is not possible to determine vaporization constant and D2 law is not respected. The results demonstrate the necessity of developing a model for the thermal decomposition of vegetable oil before attempting to create a model for the vaporization of these oils. In order to achieve this, it is essential to construct an experimental setup that more closely emulates the real conditions within the combustion chamber of a diesel engine, taking into account the variables of pressure, temperature and the heating process.

关键词： experimental device Vaporization Vegetable Oil Open Enclosure Closed Enclosure Diesel Engine

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