检索范围:
排序: 展示方式:
Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity
Zhaomiao LIU, Chengyin ZHANG, Feng SHEN
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 359-368 doi: 10.1007/s11465-011-0222-2
The flow, bearing, and carrying capacity of the cycloidal hydrostatic oil cavity in hydrostatic turntable systems are numerically simulated, considering the rotation speeds of a turntable from 0 to 5 m/s and different boundary conditions. The vortex effect is weakened, and the stability of the oil cavity is enhanced with the increase in lubricant viscosity. However, the increase in inlet speed, depth, and inlet radius of the oil cavity causes the vortex effect to increase and the stability of oil cavity to reduce. With the increase in the oil film thickness, the carrying capacity of the oil cavity diminishes. The oil cavity pressure increases along the direction of the motion of the turntable; it is distributed unevenly because of the rotation of the turntable. With the increase in turntable speed, the location and size of the vortex scope in the oil cavity flow field and the strength of the vortex near the entrance gradually weaken and move away from the entry. The distribution of pressure is determined by the locations of the vortex. When the vortex is close to the wall, the wall pressure increases at its location. Otherwise, the wall pressure decreases first and then increases after the center of the vortex.
关键词: hydrostatic oil cavity flow state oil cavity pressure stability vortex
Effects of critical geometric parameters on the optical performance of a conical cavity receiver
Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ
《能源前沿(英文)》 2019年 第13卷 第4期 页码 673-683 doi: 10.1007/s11708-019-0630-2
关键词: parabolic collector conical cavity receiver critical geometric parameters optical performance
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
《结构与土木工程前沿(英文)》 2022年 第16卷 第5期 页码 600-614 doi: 10.1007/s11709-022-0821-5
关键词: high-performance concrete cavity conventional triaxial compression pressurized liquid modified power-law criterion
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
《能源前沿(英文)》 2011年 第5卷 第1期 页码 98-103 doi: 10.1007/s11708-010-0019-8
关键词: solar cavity receiver Monte Carlo method heat flux distribution
―Summary of investigations on rotating cavity at IDG, RWTH Aachen University
Dieter BOHN, Jing REN,
《能源前沿(英文)》 2009年 第3卷 第4期 页码 489-497 doi: 10.1007/s11708-009-0040-y
Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO
《能源前沿(英文)》 2019年 第13卷 第2期 页码 284-295 doi: 10.1007/s11708-019-0613-3
关键词: cylindrical cavity receiver 3-D numerical simulation geometric optimization direct normal irradiation
孟心斋,杨建玺,孟昭焱
《中国工程科学》 2003年 第5卷 第3期 页码 62-66
液体静压支承具有很多优良性能:高运动精度,低摩擦功耗,小轴心偏移,大承载能力,强抗振性能与长使用寿命等,但这些优良的静态性能必须在上佳的动态性能保证下才能充分显示出来,因此,液体静压支承静态性能保证机床运动与加工精度,而动态性能则保证设备的安全与工作条件。文章根据力平衡与流量连续条件建立支承系统传递函数,导出支承系统动态性能新表达式即稳定性判别、抗瞬态干扰能力、固有频率与在稳态周期干扰力作用下产生的动刚度与最大振幅。通过试验台实验证实,液体静压支承动态性能新表达式计算结果可靠而且物理概念清晰,公式简单,故可用于实际。
Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect
Yikang DU,Kuanmin MAO,Yaming ZHU,Fengyun WANG,Xiaobo MAO,Bin LI
《机械工程前沿(英文)》 2015年 第10卷 第1期 页码 78-88 doi: 10.1007/s11465-015-0331-4
Hydrostatic guideways are used as an alternative to contact bearings due to high stiffness and high damping in heavy machine tools. To improve the dynamic characteristic of bearing structure, the dynamic modeling of the hydrostatic guidway should be accurately known. This paper presents a “mass-spring-Maxwell” model considering the effects of inertia, squeeze, compressibility and static bearing. To determine the dynamic model coefficients, numerical simulation of different cases between displacement and dynamic force of oil film are performed with fluent code. Simulation results show that hydrostatic guidway can be taken as a linear system when it is subjected to a small oscillation amplitude. Based on a dynamic model and numerical simulation, every dynamic model’s parameters are calculated by the Levenberg-Marquardt algorithm. Identification results show that “mass-spring-damper” model is the most appropriate dynamic model of the hydrostatic guidway. This paper provides a reference and preparation for the analysis of the dynamic model of the similar hydrostatic bearings.
关键词: hydrostatic guidway dynamic model dynamic mesh technique Levenberg-Marquardt mass-spring-damper model
孟心斋,杨建玺,孟昭焱
《中国工程科学》 2002年 第4卷 第5期 页码 63-66
文章分析了液体静压支承传统的静态性能表达式存在的严重缺陷及其产生原因,提出了新的静态性能表达式。这种新的静态性能表达式精确地表达了外加载荷与轴承间隙之间的非线性关系,真实地反映了支承的静态性能。新的静态性能通用表达式可表达各种传统节流器与新型可变节流器节流时支承的主要静态性能,很有应用价值。新的静态性能表达式只有一个变量即外加载荷与油垫推力比,故可在支承节流与尺寸参数未确定之前知道支承的主要静态性能,它有利于事先选择与确定支承在应用时的主要性能,为正确应用液体静压支承提供了可靠的技术基础。
Xiaoming LIU, Jia NING, Stephanie CLARK,
《化学科学与工程前沿(英文)》 2009年 第3卷 第4期 页码 436-442 doi: 10.1007/s11705-009-0251-0
关键词: -lactoglobulin processing functional alternative technology environmental
张梅,张民庆,朱鹏飞,黄鸿健
《中国工程科学》 2009年 第11卷 第12期 页码 13-19
高压富水充填溶腔具有水量大、水压高、规模范围大、充填介质复杂的特征,工程施工风险极高,采用传统的注浆法进行处理,受地层的不均一性、材料选择、技术水平的影响,难免会出现注浆盲区,施工中一旦注浆盲区被高压水击穿,将会发生大规模突水突泥,造成灾害。针对宜万铁路所遇到的高压富水充填溶腔,通过科技攻关,提出采取释能降压新技术进行处治。经现场实践,安全、经济、可靠,并取得了成功。释能降压技术是针对高压富水充填溶腔采取有计划、有目的的精确爆破揭示,从而释放溶腔所存储的能量,降低施工及运营过程中水土压力对隧道形成影响,之后,通过配套处治措施完成溶腔治理。
Equivalent thermal conductivity of heat pipes
LU Zesheng, MA Binghui
《机械工程前沿(英文)》 2008年 第3卷 第4期 页码 462-466 doi: 10.1007/s11465-008-0087-1
关键词: proposed distortion analysis hydrostatic motorized motorized spindle Performance
Multi-objective optimization of surface texture for the slipperswash plate interface in EHA pumps
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0704-4
关键词: electro-hydrostatic actuator axial piston pump slipper/swash plate interface multi-objective optimization surface texture
Hydraulic fracturing pressure of concentric double-layered cylinder in cohesive soil
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 937-947 doi: 10.1007/s11709-021-0754-4
关键词: hydraulic fracturing pressure layered cavity expansion theory triaxial fracturing test cohesive soil
Biodegradable, superhydrophobic walnut wood membrane for the separation of oil/water mixtures
《化学科学与工程前沿(英文)》 2022年 第16卷 第9期 页码 1377-1386 doi: 10.1007/s11705-022-2157-z
关键词: wood nanotechnology superhydrophobic biodegradable surface modification oil/water separation
标题 作者 时间 类型 操作
Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity
Zhaomiao LIU, Chengyin ZHANG, Feng SHEN
期刊论文
Effects of critical geometric parameters on the optical performance of a conical cavity receiver
Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ
期刊论文
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
期刊论文
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
期刊论文
―Summary of investigations on rotating cavity at IDG, RWTH Aachen University
Dieter BOHN, Jing REN,
期刊论文
Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation
Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO
期刊论文
Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect
Yikang DU,Kuanmin MAO,Yaming ZHU,Fengyun WANG,Xiaobo MAO,Bin LI
期刊论文
Changes in structure and functional properties of whey proteins induced by high hydrostatic pressure:
Xiaoming LIU, Jia NING, Stephanie CLARK,
期刊论文
Multi-objective optimization of surface texture for the slipperswash plate interface in EHA pumps
期刊论文