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以轴承的固体润滑为研究对象,进行了轴承跑合试验、轴承寿命及性能试验研究分析,为采用固体润滑技术解决轴承空间润滑问题提供了依据。 相似文献
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开展了固体润滑轴承组件的真空加速寿命试验,以验证固体润滑轴承组件的设计是否满足在轨寿命要求。研究了MoS2基薄膜固体润滑轴承组件在小角度摆动情况下的寿命。试验采用4对轴承模拟在轨±6°连续往复摆动,通过检测轴承组件工作时的摩擦力矩、电机电流和轴承温升判断轴承运行状态。结果显示,寿命试验运行正常,累计摩擦次数为6.2×10~7次。寿命试验后对轴承进行了尺寸精度和旋转精度复测,然后对轴承组件进行了解剖分析。复测结果显示,轴承尺寸精度和旋转精度与试验前一致,轴承润滑状态良好。试验结果验证了固体润滑轴承组件寿命满足在轨任务要求,为其它空间相机小角度摆动的扫描机构固体润滑轴承组件的长寿命设计提供了依据。 相似文献
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陀螺仪球轴承的失效分析 总被引:3,自引:1,他引:2
陀螺仪高速转子球轴承是陀螺仪的核心元件,其精度、寿命及可靠性对陀螺仪的性能、寿命及可靠性影响极大。对失效轴承的分析表明.润滑是陀螺仪球轴承使用寿命及可靠性的核心问题。轴承优化设计时应将润滑系统综合考虑.同时还要考虑润滑载体─-保持架及摩擦表面的物理性能及表面状态等。 相似文献
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分析了转子轴承系统中流体动态力的形成和自激振动的产生与油膜涡动、油膜振荡的故障。根据轴承中流体流动形态与流体平均周向均速度关系对转子失稳作一理论分析和实验研究总结,系统地探讨了转子轴承系统中润滑体流态与失稳机理。 相似文献
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分析了过去的试验数据和实际使用中失效的轴承,并提出了再现渗水润滑条件下轴承疲劳寿命的试验方法,从而能够清楚地观察到轴承的剥落过程,并进一步研究材料参数对轴承寿命的影响。结果表明:渗水润滑条件下轴承失效起源于滚动接触表面的非金属夹杂物。疲劳裂纹的扩展最初是在晶界之间,然后穿晶,最终导致剥落。介绍了NSK开发的轧机用耐水(WTF)轴承。在渗水润滑条件下,它的寿命大约是传统轴承的3倍。 相似文献
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分析了过去的试验数据和实际使用中失效的轴承,并提出了再现渗水润滑条件下轴承疲劳寿命的试验方法,从而能够清楚地观察到轴承的剥落过程,并进一步研究材料参数对轴承寿命的影响.结果表明:渗水润滑条件下轴承失效起源于滚动接触表面的非金属夹杂物.疲劳裂纹的扩展最初是在晶界之间,然后穿晶,最终导致剥落.介绍了NSK开发的轧机用耐水(WTF(R))轴承.在渗水润滑条件下,它的寿命大约是传统轴承的3倍. 相似文献
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分析了过去的试验数据和实际使用中失效的轴承,并提出了再现渗水润滑条件下轴承疲劳寿命的试验方法,从而能够清楚地观察到轴承的剥落过程,并进一步研究材料参数对轴承寿命的影响.结果表明渗水润滑条件下轴承失效起源于滚动接触表面的非金属夹杂物.疲劳裂纹的扩展最初是在晶界之间,然后穿晶,最终导致剥落.介绍了NSK开发的轧机用耐水(WTF(R))轴承.在渗水润滑条件下,它的寿命大约是传统轴承的3倍. 相似文献
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我国摩擦学研究的现状与发展 总被引:23,自引:1,他引:22
总结了自中国机械工程学会摩擦学分会成立25年来我国摩擦学研究的发展,论述了在流体润滑理论与设计、微观摩擦学、材料磨损机理与控制、表面工程与耐磨材料、润滑材料以及磨损状态监测等方面的主要成就。在此基础上提出了今后值得关注的研究方向,如减摩抗磨技术、制造过程摩擦学、生态摩擦学、仿生技术与生物摩擦学等。 相似文献
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本文提出了一种连杆机构附加弹簧平衡轴承力的方法,用此方法讨论了六杆长停机构的附加弹簧的安装位置及刚度的确定问题,并用实验验证了这一理论。 相似文献
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制造领域多智能体系统的技术研究 总被引:4,自引:3,他引:4
首先讨论了多智能体、计算机支持在协同共和和公共对象请求代理体系,综述了全能制造系统、供应链管理、虚拟企业、机器人、工艺规划、调度和装配等多智能体技术。在综合大量文献和已有研究的基础上,讨人了这些方向的主要研究方法、技术和现状,并指出基于多智能体的制造系统中的方法学研究、学习机制、集成化研究、合作机制和冲突消解等拟进一步研究的领域。 相似文献
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The current research of hydrodynamic bearing in blood pump mainly focuses on the bearing structure design.Compared with the typical plane slider bearing and Rayleigh step bearing,spiral groove bearing has excellent performance in load-carrying capacity.However,the load-carrying capacity would decrease significantly with increasing flow rate in conventional designs.In this paper,the special treatment is made to the upper spiral groove bearing to make sure that both the circulatory flowing and load-carrying capacity are high.Three-dimensional computational fluid dynamics(CFD) models in the space between rotor and shaft are developed by using FLUENT software.Effects of groove number,film height and groove depth on load-carrying capacity of the spiral groove bearings are investigated by orthogonal experiment design.The experimental results show that film height is the most remarkable factor to the load-carrying capacity.The variation tendency of load-carrying capacity reveals that the best combination of geometry is the one with groove number of 8,film height 0.03 mm and groove depth 0.08 mm.The velocity and pressure distributions in spiral groove bearings are also analyzed,and the analysis result shows that the distributions are in conformity with the design of the blood pump based on the principle of hydrodynamic bearing.The displacement of the rotor with the best combination parameters is tested by using laser displacement sensors,the testing result shows that the suspending performance is satisfactory both in axial and radial directions.This research proposes a bearing design method which has sufficient load-carrying capacity to support rotor as an effective passive hydrodynamic bearing. 相似文献
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Effects of Service Condition on Rolling Contact Fatigue Failure Mechanism and Lifetime of Thermal Spray Coatings——A Review 总被引:1,自引:0,他引:1
The service condition determines the Rolling Contact Fatigue(RCF) failure mechanism and lifetime under ascertain material structure integrity parameter of thermal spray coating. The available literature on the RCF testing of thermal spray coatings under various condition services is considerable; it is generally difficult to synthesize all of the result to obtain a comprehensive understanding of the parameters which has a great effect on a thermal spray coating’s resistance of RCF. The effects of service conditions(lubrication states, contact stresses, revolve speed, and slip ratio) on the changing of thermal spray coatings’ contact fatigue lifetime is introduced systematically. The effects of different service condition on RCF failure mechanism of thermal spray coating from the change of material structure integrity are also summarized. Moreover, In order to enhance the RCF performance, the parameter optimal design formula of service condition and material structure integrity is proposed based on the effect of service condition on thermal spray coatings’ contact fatigue lifetime and RCF failure mechanism. The shortage of available literature and the forecast focus in future researches are discussed based on available research. The explicit result of RCF lifetime law and parameter optimal design formula in term of lubrication states, contact stresses, revolve speed, and slip ratio, is significant to improve the RCF performance on the engineering application. 相似文献
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Prediction of vibration characteristics of a planar mechanism having imperfect joints using neural network 总被引:1,自引:0,他引:1
Sel?uk Erkaya 《Journal of Mechanical Science and Technology》2012,26(5):1419-1430
Clearance is inevitable in the joints of mechanisms due primarily to the design, manufacturing and assembly processes or a wear effect. Excessive value of joint clearance plays a crucial role and has a significant effect on the kinematic and dynamic performances of the mechanism. In this study, effects of joint clearances on bearing vibrations of mechanism are investigated. An experimental test rig is set up, and a planar slider-crank mechanism having two imperfect joints with radial clearance is used as a model mechanism. Three accelerometers are positioned at different points to measure the bearing vibrations during the mechanism motion. For the different running speeds and clearance sizes, this work provides a neural model to predict and estimate the bearing vibrations of the mechanical systems having imperfect joints. The results show that radial basis function (RBF) neural network has a superior performance for predicting and estimating the vibration characteristics of the mechanical system. 相似文献
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拱泥机器人运动特性分析与仿真 总被引:1,自引:0,他引:1
针对拱泥机器人在泥土环境中前进时所受转向阻力矩大的特点,结合并联机构承载能力强、运动反解容易等优点,提出采用Tricept型并联机构作为拱泥机器人转向机构的方案,以提高拱泥机器人的驱动能力.给出拱泥机器人机构的整体方案,建立拱泥机器人各杆件坐标系的变换矩阵.通过对拱泥机器人运动特性的分析,建立拱泥机器人运动轨迹的数学模型,利用计算机仿真技术模拟出拱泥机器人运动的整个过程,并给出拱泥机器人在有无障碍物情况下转向关节的角度变化.仿真结果为拱泥机器人在机构设计与路径规划研究等方面提供了依据,为拱泥机器人的运动学、动力学的分析与仿真以及虚拟样机的建立打下了一定的理论基础,同时也为其他仿生机器人的运动特性分析提供了一种有效方法. 相似文献