齿轮在复合啮合下的偏载计算

齿轮在复合啮合下的偏载计算包头钢铁学院（０１４０１０）刘鹄然复合啮合是指两个以上齿轮的啮合。如图１所示，当轮２驱动轮１和轮３，根据文献对于轮１和轮３依然有ｄ２ψ１ｄｘ２＝ｒ１ｐ１２ｃｏｓα／Ｇ１Ｊ１（１）ｄ２ψ３ｄｘ２＝ｒ３ｐ２３ｃｏｓα／Ｇ３Ｊ３（...     

CONTROLLED HOT FORMING OF RETAINING RING OF GENERATOR

０ＩＮＴＲＯＤＵＣＴＩＯＮＭｏｓｔｏｆｔｈｅｒｅｔａｉｎｉｎｇｒｉｎｇｓｏｆｇｅｎｅｒａｔｏｒａｒｅｃｕｒｅｎｔｌｙｍａｄｅｏｆｔｈｅｓｔｅｅｌｏｆ５０Ｍｎ１８Ｃｒ４ｏｒＭｎ１８Ｃｒ１８Ｎ．Ｉｔｂｅｃｏｍｅｓａｄｉｆｉｃｕｌｔｙｉｎｔｈｅｍａｎｕｆａ...     

Greenfield公司收购相应公司

Ｇｒｅｅｎｆｉｅｌｄ公司收购相应公司Ｇｒｅｅｎｆｉｅｌｄ公司是美制造钻头、硬质合金刀具、螺纹刀具以及量规的著名专业性公司。近来，该公司以强大的经济实力收购了ＴｈｒｅａｄｓＩｎｃ螺纹刀具公司和Ｈｅｎｄｃｒ。。ｖｊｌｌｅＩｎｄｕｓｔｒｉａｌＴｏｏｌＣｏ．...     

1／Cosψ展开式的意义

本文通过对１／Ｃｏｓψ进行数学分解展开新的表达式为Ｖψ＝（２．５－１．５Ｃｏｓψ）Ｖ０，并对新的表达式和１／Ｃｏｓψ进行了比较，得出了新表达式的意义，新的表达式为堆取料机的回转调速提供了新的途径。     

交流变频调速装置在悬臂式斗轮堆取料机回转速度：VH=Vo／cosψ控制中的应用

实现回转连续调速是提高悬臂式斗轮堆取料机性能所不可缺少的重要任务。本文以引进日本东芝技术生产的ＶＴ１３０型逆变器在悬臂式斗轮取料机上的应用为例,阐述了回转速度ＶＨ－Ｖｏ／ｃｏｓψ。     

激光处理对Cr—Mo—Cu合金铸铁气蚀腐蚀的影响

用Ｍａｇｎｅｔｏｓｔｒｉｃｔｉｏｎ仪研究ＣＯ２连续激光波处理Ｃｒ－Ｍｏ－Ｃｕ合金铸铁（内燃机气缸套材料）试样的气蚀特性表明，经激光处理的Ｃｏ５０合金涂敷层显示出优良的抗气蚀腐蚀性能。本文还研究了各种微观组织的气蚀腐蚀主要机理。     

用特定输入电压函数抑制弹性连杆机构振动

为消减电机－－弹性连杆机构系统中连杆机构的振动,提出利用特定输入电压函数抑制振动的方法。运用迭代式振型叠加法对系统的动力学方法求解,得到稳态动力学响应。构造输入电压函数Ｖ（ψ）＝Ｖｏ－ｂｍｓｉｎ（ｎψ＋ψｂ）,用试验优化法确定待定参数ｂｎ、ψ和ｎｏ在此输入电压函数下,机构最大应变降低了约２６．５％。     

《机械工程学报》英文版2000年第 13卷第3期目次、摘要预告

刚体热弹性的分析模型Ｌｕｃｉａ Ｕｍｂｅｒｔｏ （Ｉ． Ｎ．Ｆ． Ｍ．－ Ｉｓｔｉｔｕｔｏ Ｎａｚｉｏｎａｌｅ ｐｅｒｌａ Ｆｉｓｉｃａ ｄｅｌｌａ Ｍａｔｅｒｉａ,Ｎｕｃｌｅｏ Ａｐｐｌｉｃａｔｉｖｏ, Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃｓ ａｎｄ Ｔｅｃｈｎｏｌｏｇｉｃａｌ Ｔｒａｎｓｆｅｒ Ｏｆｆｉｃｅ, ａｔ Ｐａｒｃｏ Ｓｃｉｅｎｔｉｆｉｃｏ Ｔｅｃｎｏｌｏｇｉｃｏ ｉｎ Ｖａｌｌｅ Ｓｃｒｉｖｉａ, ＳｔｒａｄａＳａｖｏｎｅｓｅＩｏｃ．ＲｉｖａｌｔａＳｃｒｉｖｉａ, Ｉ－１５０４７ Ｔｏｒｔｏｎａ（ＡＬ）,Ｉｔａｌ…     

A NEW MODELING METHOD FOR MACHINE-FOUNDATION COUPLING SYSTEM AND ITS APPLICATION TO THE CONTROL OF POWER FLOW

０ＩＮＴＲＯＤＵＣＴＩＯＮＶｉｂｒａｔｉｏｎｔｒａｎｓｍｉｓｓｉｏｎｆｒｏｍａｍａｃｈｉｎｅｓｏｕｒｃｅｔｏｆｌｅｘｉｂｌｅｓｕｐｐｏｒｔｉｎｇｓｔｒｕｃｔｕｒｅｓａｎｄｔｈｅａｓｏｃｉａｔｅｄｓｏｕｎｄｒａｄｉａｔｉｏｎｆｒｏｍｔｈｅｖｉｂｒａｔ...     

ADAPTIVE STATE FEEDBACK CONTROLLER WITH KALMAN FILTER OBSERVER FOR MACHINING PROCESS

０ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｄｅｍａｎｄｆｏｒｂｅｔｅｒｐｒｅｃｉｓｉｏｎ，ｈｉｇｈｅｒｐｒｏｄｕｃｔｉｖｉｔｙａｎｄｌｏｗｅｒｐｒｏｄｕｃｔｃｏｓｔ，ａｓｗｅｌａｓｓａｆｅａｎｄｏｐｔｉｍａｌｃｕｔｉｎｇｃｏｎｄｉｔｉｏｎｓｓｕｇｇｅｓｔｓｔｏ...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.