共查询到12条相似文献,搜索用时 6 毫秒
1.
RESEARCH ON ZERO CLEARANCE CYCLOID BALL TRANSMISSION 总被引:7,自引:0,他引:7
RESEARCHONZEROCLEARANCECYCLOIDBALLTRANSMISSIONQuJifangAnZijunYanshanUniversityAbstract:Thesteelballtransmissionofzerogearclea... 相似文献
2.
HuXinXi JuntongJin YeInstitute of Computer Integrated Manufacturing Shanghai Jiaotong University Shanghai ChinaGu Dongyun Dai KerongDepartment of Orthopaedics Shanghai th People''''s Hospital Shanghai Second Medical UniversityShanghai China 《机械工程学报(英文版)》2003,16(3):309-312
Former research work about the modeling of hip joint focus on the upper segment of femoral, and assumes the acetabulum cup is sphere concave, and the acetabulum prostheses is semisphere. A method of acquiring the point data on the surface of the hipbone using the reverse engineering technology is presented. After analyzing the acetabulum surface fitting error, a rotation ellipsoid CAD model is applied to fit the acetabulum surface, and then optimization technique is used to find the geometric parameters of the model. The fitting error between the sphere and rotation ellipsoid is compared and gets the result that the fitting error of rotation ellipsoid is smaller than sphere, and the rotation ellipsoid can describe the shape of the acetabulum better. 相似文献
3.
4.
GAN Fangjian Department of Precision Machinery Precision Instrumentation University of Sdence Technology of China Hefei China LIU Zhengshi College of Mechanical Automobile Engineering Hefei University of Technology Hefei China REN Chuansheng ZHANG Ping Department of Precision Machinery Precision Instrumentation University of Science Technology of China Hefei China 《机械工程学报(英文版)》2007,20(4):8-11
Robot's dynamic motion error and on-line compensation based on multi-axis force sensor are dealt with.It is revealed that the reasons of the error are formed and the relations of the error are delivered.A motion equation of robot's termination with the error is established,and then,an error matrix and an error compensation matrix of the motion equation are also defined.An on-line error's compensation method is put forward to decrease the displacement error,which is a degree of millimeter,shown by the result of simulation of PUMA562 robot. 相似文献
5.
基于GPS的圆度、圆柱度误差数字化计量方法研究 总被引:2,自引:0,他引:2
基于对数字化计量过程中关键操作技术的研究,给出圆度、圆柱度误差计量的操作算子构成策略及选用原则,并针对传统的几何误差评定中随意性大、评定参数单一、效率低下等不足,提出现代几何误差计量中以"高效、规范"为目标的多元化评定思想.并通过实例说明该数字化计量思想的运作模式及其工程价值,进一步明确基于GPS(geometrical product specification)的数字化计量方法对于实现误差评定的数字化、规范化和高效化是至关重要的,同时,对于促进国家(际)标准的发展及有效应用也具有十分重要的意义. 相似文献
6.
ZHANG Shuyou YI Guodong XU Xiaofeng 《机械工程学报(英文版)》2007,20(5):114-119
Aiming at the problem of structure design in reverse-design of mechanism, a structure mapping method based on reverse solving of locus and motion (RSLM) is presented. The mechanism scheme meeting the requirements of geometric and structural features is obtained through RSLM. The element instance subsets related to component are established based on the element type mapping, pair structure type mapping and design knowledge mapping between components and elements layer by layer. The assembly position mapping of elements is established based on the topological structure information of mechanism scheme, and the product modeling of structure mapping is realized. The algorithm program and prototype system of product structure mapping based on RSLM are developed. Application samples show that the method implements the integration of scheme design, assembly design and structure design, and modeling for product structure mapping based on RSLM. The feasibility of assembly is analyzed in scheme design that contributes to reducing the design error, and raising the design efficiency and quality. 相似文献
7.
8.
利用压力传感器对聚氯乙稀塑料搅拌摩擦焊时搅拌头受到的径向阻力进行动态测量,对引起搅拌头径向阻力变化的原因及相关因素的影响规律进行分析.结果表明,搅拌摩擦焊过程开始后,径向阻力要经过一个先急剧上升,达到峰值后又迅速下降,到某一定值后稳定下来的过程.在其他条件不变的前提下,仅提高搅拌头的旋转速度使径向峰值阻力和稳态阻力都下降,达到峰值和稳态阻力的时间都缩短;仅提高焊接速度使峰值阻力大幅度上升,而稳态阻力却有升有降,但幅度不大,达到峰值阻力的时间变化不大,而达到稳态阻力的时间延长;搅拌头直径的变化会同时引起摩擦发热功率和散热功率的变化,它对径向阻力的影响比较复杂. 相似文献
9.
考虑阀口误差的阀控非对称液压缸系统建模、仿真与试验 总被引:3,自引:0,他引:3
从解决比例阀控制非对称缸系统存在的超压问题入手,分析因加工误差引起的各阀口重叠量不一致这一非线性因素对系统性能的影响,建立考虑阀口误差的阀控非对称缸系统的非线性状态方程模型和键图模型。应用这两种非线性数学模型分析一实际非对称阀控制非对称缸系统的压力特性,与试验结果的对比分析验证了所建的非线性数学模型的正确性。仿真和试验研究揭示比例阀控制非对称缸系统的阀口误差对系统性能影响较大,往往是引起有杆腔压力超过供油压力的主要原因。通过大量仿真研究获得了阀口误差与系统超压之间的关系,研究表明适当提高比例阀阀口的加工精度有利于消除超压现象和提高系统的性能,进而建议将某些比例阀阀口误差控制在最大阀位移的0.5%以内。给出的两种非线性数学模型具有通用性,可用于对各类阀控缸系统进行系统仿真、设计和控制策略等方面的理论研究工作。 相似文献
10.
11.
WANG Jinghe WANG Hongxiang XU Zongwei DONG Shen WANG Shiqian ZHANG Huali 《机械工程学报(英文版)》2008,21(5):62-64
In this paper, three different tips are employed, i.e., the carbon nanotube tip, monocrystalline silicon tip and silicon nitride tip. Resorting to atomic force microscope (AFM), they are used for measuring the surface roughness of indium tin oxide (ITO) film and the immunoglobulin G (IgG) proteins within the scanning area of 10 μm×10 μm and 0.5 μm×0.5 μm, respectively. Subsequently, the scanned surface of the ITO film and IgG proteins are analyzed by using fractal dimension. The results show that the ffactal dimension measured by carbon nanotube tip is biggest with the highest frequency components and the most microscopic information. Therefore, the carbon nanotube tip is the ideal measuring tool for measuring super-smooth surface, which will play a more and more important role in the high-resolution imaging field. 相似文献
12.
综合传动装置变速机构振动频率与敏感度分析 总被引:2,自引:1,他引:2
为了避免综合传动装置在扭转振动时发生共振,需要对传动装置的结构参数进行重新设计、修改。一个复杂的传动装置中,修改哪些结构参数才能有效地改变系统的固有频率是不易确定的。文中建立某综合传动系统的多自由度质量-弹性-阻尼动力学模型,根据复模态振动理论求解该系统在某一挡位下的振动模态,并进行振动频率对系统结构参数的敏感度分析,从33个结构参数中选出4个进行修改,可以有效地改变系统的固有频率。 相似文献