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Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)最新文献

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Simulation of Viscous Diffusion for Extension of the Surface Vorticity Method to Boundary Layer and Separated Flows 将表面涡量法推广到边界层和分离流的粘性扩散模拟
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-06-01 DOI: 10.1243/JMES_JOUR_1981_023_029_02
D. Porthouse, R. Lewis
{"title":"Simulation of Viscous Diffusion for Extension of the Surface Vorticity Method to Boundary Layer and Separated Flows","authors":"D. Porthouse, R. Lewis","doi":"10.1243/JMES_JOUR_1981_023_029_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_029_02","url":null,"abstract":"A numerical method for two-dimensional incompressible viscous fluid flows is tested on the diffusion of a point vortex. It is then applied to the boundary layer to reconstruct the Blasius profile, to demonstrate flow separation, and to simulate turbulence. The significance of Thwaites' boundary layer parameter for flow separation is explained. The Kelvin-Helmholtz instability, which is responsible for two-dimensional turbulence, is represented by the motion of an array of point vortices after an initial disturbance. The formation of the Von Karman vortex street downstream of a circular cylinder is described by computer simulation, and the influence of viscous diffusion is shown. For two different cylinder Reynolds numbers the vortex shedding frequencies and oscillating lift and drag forces are evaluated.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122308740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Velocity Fluctuation in Spatial Four-Link Mechanisms 空间四连杆机构的速度波动
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-06-01 DOI: 10.1243/JMES_JOUR_1981_023_027_02
M. Osman, R. Dukkipati
{"title":"Velocity Fluctuation in Spatial Four-Link Mechanisms","authors":"M. Osman, R. Dukkipati","doi":"10.1243/JMES_JOUR_1981_023_027_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_027_02","url":null,"abstract":"","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114601156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A Method for Predicting Annular Diffuser Performance with Swirling Inlet Flow 带旋流进口的环形扩压器性能预测方法
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-06-01 DOI: 10.1243/JMES_JOUR_1981_023_023_02
A. Elgammal, A. Elkersh
{"title":"A Method for Predicting Annular Diffuser Performance with Swirling Inlet Flow","authors":"A. Elgammal, A. Elkersh","doi":"10.1243/JMES_JOUR_1981_023_023_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_023_02","url":null,"abstract":"A method for predicting the performance of annular diffusere with swirled flow at inlet is presented. The method is based on the assumptions of one-dimensional potential flow using a frictional coefficient parameter to account for friction losses. Theoretical predictions are in good agreement with available experimental data for a variety of annular diffuser geometries. In addition a computer program has been developed, allowing the present analytical technique to be readily applied to the design of any annular diffuser with swirled flow at inlet.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"382 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122857425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Drain Discharge Characteristics of Horizontal Drums 水平滚筒的排水特性
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_016_02
R. Cranfield
{"title":"Drain Discharge Characteristics of Horizontal Drums","authors":"R. Cranfield","doi":"10.1243/JMES_JOUR_1981_023_016_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_016_02","url":null,"abstract":"An investigation is made of the normal steady drainage of water from horizontal drums freely discharging in a steam atmosphere via vertical drains.The flow to the drain orifice in a horizontal drum is asymmetric. At the drain the discharge flow may have several forms; however, there are two basic regimes. At low discharge rates it resembles flow over a weir, whereas with increasing flow there is a transition to a form of orifice flow when discharge is as a jet. In both cases the discharging water is free from entrained steam and vortex formation. Correlations are given to determine the regime and, hence, the applicable head/discharge relationship for drain/drum radius ratios from 0–08 to 0–25.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126892922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Bending of Long Steel and Aluminium Rods during end Impact with a Rigid Target 长钢和铝杆与刚性目标端部碰撞时的弯曲
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_017_02
S. Reid, A. Edmunds, W. Johnson
{"title":"Bending of Long Steel and Aluminium Rods during end Impact with a Rigid Target","authors":"S. Reid, A. Edmunds, W. Johnson","doi":"10.1243/JMES_JOUR_1981_023_017_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_017_02","url":null,"abstract":"Bless and Barber (1) ‖ have shown that rod projectiles can be affected by the propagation of bending deformation along their lengths when they strike rigid targets at sub-ordnance velocities. Experiments are described in which a range of different modes of deformation are identified for both normally and obliquely incident steel and aluminium rods of length to diameter ratio 24 : 1. The results are discussed from the point of view of classical dynamic structural plasticity.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"362 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132473433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
An Analogue Simulation of the Nonlinear Vibration of a Plate with a Central Opening Subjected to Tension Loading 张拉载荷作用下带中心开口板非线性振动的模拟仿真
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_019_02
P. K. Datta
{"title":"An Analogue Simulation of the Nonlinear Vibration of a Plate with a Central Opening Subjected to Tension Loading","authors":"P. K. Datta","doi":"10.1243/JMES_JOUR_1981_023_019_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_019_02","url":null,"abstract":"The complicated, nonlinear stiffness characteristics of a tensioned plate with a central opening are studied via analogue computer simulation. Associated frequency response characteristics and statistical properties of the response to random excitation are examined using a single degree of freedom model.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116737700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Effects of Projectile Speed and Medium Resistance in Ricochet off Sand 弹丸速度和介质阻力对弹丸跳沙的影响
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_015_02
Y. L. Baif, W. Johnson
{"title":"The Effects of Projectile Speed and Medium Resistance in Ricochet off Sand","authors":"Y. L. Baif, W. Johnson","doi":"10.1243/JMES_JOUR_1981_023_015_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_015_02","url":null,"abstract":"It has been observed experimentally that when a sphere ricochets off water or sand the critical impact angle depends on the impinging velocity.To explain this, a model is developed which takes into account the weight of the sphere and the static resistance of the medium into which penetration occurs. The proposed model can also treat processes in which the angle of impact is large and where the velocity of the sphere undergoes considerable change. Projectile trajectories which have been calculated for various conditions are presented and discussed. Numerical results for steel, aluminium alloy, and lead spheres are in good agreement with such experimental results as are available.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"0 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134486336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Energy Dissipation in Gyromechanics through the Concept of Intervalwise Rigidity 基于区间刚度概念的陀螺力学能量耗散
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_018_02
F. Rimrott
{"title":"Energy Dissipation in Gyromechanics through the Concept of Intervalwise Rigidity","authors":"F. Rimrott","doi":"10.1243/JMES_JOUR_1981_023_018_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_018_02","url":null,"abstract":"In the interpretation of the energy sink hypothesis the real body has in the past been approximated by two or more rigid bodies, connected in such a fashion that damping forces acting between them dissipate energy. This approach suffers from several shortcomings, and a more rational treatment of the problem can be achieved by assuming intervalwise rigidity.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114445515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method: 非牛顿润滑滑动轴承的有限元分析(Prandtl模型)
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_014_02
S. Tayal, R. Sinhasan, D. Singh
{"title":"Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method:","authors":"S. Tayal, R. Sinhasan, D. Singh","doi":"10.1243/JMES_JOUR_1981_023_014_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_014_02","url":null,"abstract":"Additives are used to improve the performance of commercial lubricants. These lubricants behave like non-Newtonian fluids (shear thinning or shear thickening). The effect of the nonlinear behaviour on the performance characteristics of finite width journal bearings is investigated using the Prandtl model. The finite element method, using Galerkin's technique, has been used to solve the Navier-Stokes equations in cylindrical coordinates, representing the flow-field in the clearance space of a bearing using Newtonian fluids, and the non-Newtonian effect is introduced by modifying the viscosity term for the model in each iteration. The results applicable to shear-thinning (pseudoplastic) and shear-thickening (dilatant) lubricants are compared with the established results for Newtonian lubricants.","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121116962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
A Theoretical Analysis of the Twin-Land Type of Oil-Control Piston Ring: 双陆式控油活塞环的理论分析
Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23) Pub Date : 1981-04-01 DOI: 10.1243/JMES_JOUR_1981_023_013_02
B. Ruddy, D. Dowson, P. Economou
{"title":"A Theoretical Analysis of the Twin-Land Type of Oil-Control Piston Ring:","authors":"B. Ruddy, D. Dowson, P. Economou","doi":"10.1243/JMES_JOUR_1981_023_013_02","DOIUrl":"https://doi.org/10.1243/JMES_JOUR_1981_023_013_02","url":null,"abstract":"Cyclic variations of the important operating characteristics of the twin-land type of oil-control ring have been analysed by considering radial and torsional equilibrium of the ring cross-section. ...","PeriodicalId":114598,"journal":{"name":"Archive: Journal of Mechanical Engineering Science 1959-1982 (vols 1-23)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130356886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 46
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