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气缸振动对活塞裙润滑的影响 被引量:15
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作者 孟凡明 赵荣珍 张优云 《内燃机学报》 EI CAS CSCD 北大核心 2003年第2期179-182,共4页
利用迭代算法分析了存在油膜惯性时气缸振动对活塞裙润滑特性的影响。通过Navier Stocks方程和雷诺方程的交替求解,新的迭代算法能追踪油膜惯性存在下的速度场和压力场随时间的变化。据此导出了正弦激励下和油膜惯性作用下的混合润滑雷... 利用迭代算法分析了存在油膜惯性时气缸振动对活塞裙润滑特性的影响。通过Navier Stocks方程和雷诺方程的交替求解,新的迭代算法能追踪油膜惯性存在下的速度场和压力场随时间的变化。据此导出了正弦激励下和油膜惯性作用下的混合润滑雷诺模型。计算结果表明:在正弦激励下,随着气缸振动频率的增加,油膜承载力和摩擦力出现明显波动,性能曲线光滑性也出现波动,而且这种波动在缸体作挤压运动时比分离时更为明显;随着振幅的增加,当缸体做分离运动时,在吸气行程下止点附近,油膜承载力和摩擦力发生显著变化;当缸体做挤压运动时,排气行程中部附近有较大的油膜承载力和摩擦力变化。 展开更多
关键词 气缸振动 活塞裙润滑 迭代算法 混合润滑雷诺方程 发动机
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磁性振动气缸的研究
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作者 袁胜发 《液压与气动》 北大核心 2009年第1期67-68,共2页
针对目前的振动气缸存在活塞磨损大、对端盖有冲击等问题,研究一种磁性振动气缸,在活塞上安装磁性材料,缸筒上安装磁开关,磁开关控制电磁阀轮流给活塞左右端充压缩空气,使得活塞不断产生来回运动。
关键词 气动 磁性 振动气缸
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介绍一种新式振动气缸 被引量:1
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作者 袁胜发 《液压与气动》 北大核心 1997年第4期19-20,共2页
介绍一种新式振动气缸袁胜发振动气缸以压缩空气为动力,不需要外加气阀控制,就可自动产生往复振动,在气动系统中作执行器,可广泛应用于制造气动锯、气动刮研刀等气动工具,以及其他需要产生振动或往复运动的场合。振动气缸的结构... 介绍一种新式振动气缸袁胜发振动气缸以压缩空气为动力,不需要外加气阀控制,就可自动产生往复振动,在气动系统中作执行器,可广泛应用于制造气动锯、气动刮研刀等气动工具,以及其他需要产生振动或往复运动的场合。振动气缸的结构如图所示。排气孔有八个,均匀分布于... 展开更多
关键词 振动气缸 气缸 气压传动
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振动气缸 被引量:2
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作者 李光明 郭学敬 《液压与气动》 北大核心 1994年第6期21-21,共1页
振动气缸李光明,郭学敬在包装机的落料筒上常常粘附物料,影响包装机的称量精度,因此需要人工敲打落料筒,使粘附物脱落。为提高称量精度和自动化水平,设计了振动气缸来代替人工敲打。1结构原理振动气缸由节流阀、二位三通换向阀、... 振动气缸李光明,郭学敬在包装机的落料筒上常常粘附物料,影响包装机的称量精度,因此需要人工敲打落料筒,使粘附物脱落。为提高称量精度和自动化水平,设计了振动气缸来代替人工敲打。1结构原理振动气缸由节流阀、二位三通换向阀、快速排气阀和气缸组合而成。其气动回... 展开更多
关键词 振动气缸 气缸 包装机
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内燃机工况和气缸敲击振动的关系探讨
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作者 白宗正 《内燃机与配件》 2018年第9期20-20,共1页
针对内燃机轴非稳定系扭转振动和稳定扭振激振力矩工况下,对于气缸发生敲击振动的影响,采用计算方法,并且结合压力传感器的使用,对非稳定工况内燃机气缸压力进行测量,分析了阶次力矩与提速率之间的关系。有效地避免了传统频谱分析出现的... 针对内燃机轴非稳定系扭转振动和稳定扭振激振力矩工况下,对于气缸发生敲击振动的影响,采用计算方法,并且结合压力传感器的使用,对非稳定工况内燃机气缸压力进行测量,分析了阶次力矩与提速率之间的关系。有效地避免了传统频谱分析出现的"频率混叠"现象,分析出非稳定工况内燃机激振力矩中的特征分量,利用阶次分析法对非稳定工况内燃机激振力矩。 展开更多
关键词 内燃机工况 气缸敲击振动 关系探讨
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阀控振动气缸的结构设计与仿真法研究
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作者 马泳涛 王栋 马胜钢 《矿山机械》 北大核心 2003年第4期46-48,共3页
The paper discusses the feasibility of vibrating pneumatic cylinder controlled by valve and its structure. The method of power bond graph is used to simulate the system. On the basis of simulation, computer program is... The paper discusses the feasibility of vibrating pneumatic cylinder controlled by valve and its structure. The method of power bond graph is used to simulate the system. On the basis of simulation, computer program is worked out. The problems existed in simulation are analyzed. The reliability of the simulation is improved by use of many methods. In this way, the universality of program is enhanced. It’s a perfect combination of simulation and mechanical design. [ 展开更多
关键词 阀控振动气缸 结构设计 仿真法 振动 振动设备 激振装置 频率 振幅
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真空扩散焊机加压装置及加压方法
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《热加工工艺》 CSCD 北大核心 2006年第23期72-72,共1页
本发明公开了一种真空扩散焊机加压装置,以解决现有技术焊接时间长、焊接温度高的问题。其方案是在现有技术的基础上增加一个振动气缸。和与振动气缸配套的精密调压阀、振动控制阀和可编程控制器PLC。振动气缸与加压气缸共用一根加压... 本发明公开了一种真空扩散焊机加压装置,以解决现有技术焊接时间长、焊接温度高的问题。其方案是在现有技术的基础上增加一个振动气缸。和与振动气缸配套的精密调压阀、振动控制阀和可编程控制器PLC。振动气缸与加压气缸共用一根加压轴,其余零部件均刚性连接。振动气缸通过精密词压阀、振动控制阀与气源气路连接,并与加压气路并联;振动控制阀由可编程控制器PLC控制。本发明通过振动加载或者振动与静压的复合加载,可降低焊接温度30-300℃、减少焊接保温时间20%~50%.提高设备效率1~3倍. 展开更多
关键词 加压装置 真空扩散 可编程控制器PLC 焊机 振动气缸 焊接时间 焊接温度 刚性连接
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Numerical Simulation of Two-Dimensional Flow over Three Cylinders by Lattice Boltzmann Method 被引量:1
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作者 杨红兵 刘扬 +1 位作者 许友生 寇建龙 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第11期886-892,共7页
The numerical simulation using the multiple relaxation time lattice Boltzmann method (MRT-LBM) is carried out for the purpose of investigating the two-dimensional flow around three circular cylinders. Among these th... The numerical simulation using the multiple relaxation time lattice Boltzmann method (MRT-LBM) is carried out for the purpose of investigating the two-dimensional flow around three circular cylinders. Among these three circular cylinders, one of the three cylinders on which a forced in-line vibrating is used to do this research and attempt to find out the effects of the moving cylinder and the other two rigid cylinders on the wake characteristics and vortex formation. As a benchmark problem to discuss the problem of lift coefficient r.m.s for these cylinders with spacing ratios T/ D between other rigid side-by-side cylinders, and the calculation is carried out with two compared cases at Reynolds number of 100, two of the cylinders are rigid and the other one is an in-line vibrated cylinder lying downstream, in addition, forced vibrating amplitude and frequency are A/D = 0.5 and fv= 0.4 (where A is the forced amplitude, D is the cylinder diameter, and fv stands for the vibrating frequency, respectively). The calculated results not only indicate that the spacing ratios T/D (T is the center-to-center spacing between the two upstream cylinders) have influence on the wake patterns and the formation of vortex shedding, but also analyze the lift coefficient r.m.s for the three cylinders with the spacing ratios S/D (where S is the center-to-center spacing between the center of upstream two side-by-side cylinders and downstream cylinder). 展开更多
关键词 flow over three cylinders numerical simulation lattice Boltzmann method
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Combined deformation of filament-wound cylinder and application to torsion vibration control
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作者 李玉兰 《Journal of Chongqing University》 CAS 2002年第2期83-85,共3页
The combined deformation and mechanical properties of filament-wound cylinder of filament reinforced composite materials are investigated. A method of using filament-winding composites to reduce the amplitude of torsi... The combined deformation and mechanical properties of filament-wound cylinder of filament reinforced composite materials are investigated. A method of using filament-winding composites to reduce the amplitude of torsion vibration in the case of special stimulated vibration is established. A design formula of anisotropic filament-wound cylinder to reduce the torsion vibration of axle components is obtained. The results indicate that by putting the filament-wound cylinder on an axis, the torsion vibration of the axis can be reduced effectively. 展开更多
关键词 combined deformation coupling ANISOTROPY torsion vibration control
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Numerical Study of an Oscillating Smaller Cylinder in the Wake of an Upstream Larger Cylinder
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作者 GAO Yangyang YU Dingyong +1 位作者 WANG Xikun TAN Soon Keat 《Journal of Ocean University of China》 SCIE CAS 2012年第2期111-117,共7页
A numerical study of flow around two tandem cylinders with unequal diameters was carried out. The upstream larger cylinder was fixed and the downstream smaller cylinder was allowed to oscillate in the transverse direc... A numerical study of flow around two tandem cylinders with unequal diameters was carried out. The upstream larger cylinder was fixed and the downstream smaller cylinder was allowed to oscillate in the transverse direction only. Comparisons of the experimental and numerical results were made to investigate the effects of the gap ratio on the maximum vibration amplitude and vortex shedding frequency. The results showed that the vibration response of the smaller cylinder was significantly affected by the presence of the upstream larger cylinder, and resulted in greatly reduced vibration amplitudes. With an increasing gap ratio, the vibration amplitude increased. However, the magnitude was lower than that corresponding to a single cylinder (with the same diameter as that of the downstream smaller cylinder) under the same flow conditions. 展开更多
关键词 tandem cylinders with unequal diameters numerical simulation gap ratio vibration amplitude
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An experimental investigation of dual-resonant and non-resonant responses for vortex-induced vibration of a long slender cylinder 被引量:2
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作者 WU XiaoDong GE Fei HONG YouShi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第2期321-329,共9页
Experimental results of the dual-resonant and non-resonant responses are presented for vortex-induced vibrations(VIV)of a long slender cylinder.The cylinder has a diameter of 10mm and a length of 3.31 m,giving an aspe... Experimental results of the dual-resonant and non-resonant responses are presented for vortex-induced vibrations(VIV)of a long slender cylinder.The cylinder has a diameter of 10mm and a length of 3.31 m,giving an aspect ratio of 331.The cylinder was towed by a carriage with the velocity up to 1.5 m/s,with the Reynolds number varying from 2500 to 38000.Three different weights were used to provide the initial tension.Dual resonance means that resonance occurs simultaneously in both the cross-flow(CF)and in-line(IL)directions.The experiments were conducted in two stages.At the first stage,dual-resonant dynamic features of the cylinder subjected to vortex-induced excitation were investigated.The features of CF and IL vibration amplitude,motion orbits,phase angle differences,dominant frequencies and mode order numbers are presented.At the second stage of the experiments,particular emphasis was placed on non-resonant dynamic features.The variation of multi-mode modal displacement amplitudes was investigated in detail. 展开更多
关键词 vortex-induced vibrations long slender cylinder dual-resonant responses non-resonant responses
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