Papers by Author: Ji Shun Li

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Authors: Yong Gang Liu, Ji Shun Li, Wen Xiang Shi, Xian Zhao Jia
Abstract: Radial runout is a major performance parameter of running accuracy of bearings. In order to increase the running accuracy of cylindrical roller bearings, a new algorithm is presented. Firstly, the principle of program is researched under some suitable conditions. Secondly, the process and structure of program is described in detail. In the end, the influence of the size of roundness error on the radial runout of bearings is researched. The results show that the radial runout increases 7 times higher with the increase of roundness error size of outer ring.
Authors: Hong Biao Han, Z.D. Shang, Ji Shun Li
Abstract: In this paper, processing characteristics and difficulties of drum with fold line grooves are analyzed. Three kinds of CNC machining methods, namely three-axis linkage, single-axis servo and two-axis servo, are introduced. With CNC machining methods of single-axis servo and two-axis servo, the spindle motor of machine tool needs not to transform. A CNC system is developed which acquires the absolute position on the circle of drum through the spindle encoder and spindle zero position switch. It allows simultaneous servo position and velocity control of Z-axis AC servo motor or both Z-axis and X-axis AC servo motors. With the changes of angular displacement of spindle, the system manages the interpolation motion of X-axis and Z axis, so drums with fold line grooves can be achieved by this way. Both of these methods have been applied to transformation of machine tool with simple, economical and reliable operation. This paper also proposes three methods to improve the processing efficiency of the drum: increasing a function of return to zero rapidly, processing with more tools at the same time, processing external steel sleeve with fold line grooves and then installing it on a smooth drum.
Authors: Yu Jun Xue, Chen Shen, Ji Shun Li, Hang Li, Dong Hong Si
Abstract: Ni-Y2O3 nanocomposite coating was electrodeposited from a nickel sulfamate solution containing Y2O3 particles and ultrasonic was applied during the process of the electrodeposition. The surface morphology and microstructure of the composite coatings were analyzed by a scanning electronic microscope (SEM) and a high-resolution transmission electron microscope (HRTEM). The corrosion resistence of the coatings was evaluated in the solution of 10 wt.% HCl aqueous solution. The results indicate that the Ni-Y2O3 nanocomposite coating shows a refined crystal grain and improved corrosion resistance compared with pure Ni coating. The Ni-Y2O3 nanocomposite coating prepared under ultrasonic condition exhibits a superior corrosion resistance due to the formation of denser structure and finer-grain scale.
Authors: Yu Jun Xue, Shuang Shuang Liu, Ji Shun Li, Fang Yang
Abstract: Tensile test of low carbon steel was carried out on a universal electronic testing machine. Loading and strain test data of low carbon steel was acquired by means of the tensile test. Based on the measured tensile specimen data, elastic modulus of low carbon steel was calculated. It was found that elastic modulus of low carbon steel varied during tensile process. The damage of low carbon steel under tensile was identified by the calculation of elastic modulus.
Authors: Shuang Shuang Liu, Yu Jun Xue, Yang Yang Xu, Ji Shun Li
Abstract: Ni-ZrO2-CeO2 nanocomposite coating was prepared by pulse electrodeposition. The effect of addition of ZrO2 and CeO2 nanoparticles, average current density, duty cycle and pulse current on microhardness of Ni-ZrO2-CeO2 nanocomposites were studied. The results show that microhardness of nanocomposite is increased at first and then decreased with the increasing additive amounts of two kinds of nanoparticles. With increasing reverse the average current density, the microhardness of the composite coating increases. Also, the microhardness of nanocomposite fall with the increasing of pulse frequency. With the positive duty ratio increasing, the microhardness of the composite coating increase at first and then decreased, but with the increasing of the reverse duty ratio, the microhardness of nanocomposite coating is gradually decreased.
Authors: Yi Liu, Guo Ding Chen, Ji Shun Li, Yu Jun Xue
Abstract: The main objective of this study was to model and simulate a multi-flexible-body three-dimensional model for researching the Multi – rope Friction Winder system. By introducing the multi-flexible-body dynamics method, a multi-flexible-body virtual prototype of the winder is been builded with the RecurDyn software package. Kinematics and dynamics characteristic date are obtained by computer-aided dynamic simulation of virtual Multi – rope friction winder. The result is in accord with theoretical analysis. The research work will provide a powerful tool and useful method for the design of economic and credible elevator system. The approach can be generalized to analysis other flexible drive fields.
Authors: X.Q. Lei, Yu Jun Xue, Ji Shun Li, Wei Ma, Ming De Duan
Abstract: A new algorithm of evaluating conicity error, named as geometrical optimization searching algorithm (GOSA), has been presented, according to the geometric characteristics of conicity error. The principle and steps of using this algorithm to solve the conicity error was described in detail. The mathematical formula and program flowchart were given. The optimization method and linearization method and uniform sampling did not adopt for this algorithm. The principle of the algorithm is that varying the position of the supposed ideal conical surface repeatedly according to pre-established transfer mode, calculating the distances between all measuring points and the supposed ideal conical surface and comparing the extreme differences among the distances at the same time, and thus the minimum zone method of conicity error is obtained. The experimental results show that the conicity error can be evaluated using this algorithm effectively and exactly.
Authors: Hong Bin Liu, Hong Biao Han, Yu Jun Xue, Ji Shun Li
Abstract: Laser Surface Texturing (LST) is an advanced method of surface micro-texturing technology. The aim of this paper is to investigate the influence of laser surface texturing distribution patterns on lubricant characteristics for laser texturing surfaces against cylindrical under conditions of film lubrication. The laser texturing surfaces are processed with power levels under YAG laser. Under conditions of constant depth and area coverage ratio of LST,patterns of the texture distribution and the sliding orientation relative to the texture were systematically varied. The experimental results suggested that 20° circumferential interval can increase the load-carrying ability of lubricating film.
Authors: Wei Ma, Yong Chao Lu, Yong Gang Liu, Ji Shun Li, Yu Jun Xue
Abstract: Multi-plies bellows is a kind of cylindrical thin-walled container with curved shape. It is effective in seal, energy storage and vibration isolation. In the paper, the modal loss factor of multi-plies bellows was analyzed based on the modal strain energy method. Then the finite element models of multi-piles bellows were given by ANSYS. The mechanical performance of bellows was analyzed in detail. The strain energy distribution of multi-plies bellows and viscoelsticity layer were given. According to the strain energy, the influence of sandwich damping on the loss factor was studied. The results show that the loss factor can be improved by employing the sandwich damping with big thickness and elastic modulus 200MPa.
Authors: X.C. Ku, Ji Shun Li, Wei Ma, Hong Biao Han
Abstract: According to the characteristics and requirements of weighing process for liquid raw material, the system of data acquisition and control based on serial port communication is designed in this paper. The system adopts the modularizing distributed structure and the way of RS485 communication to ensure the reliable data transmitting between IPC (Industrial Personal Computer) and modules. Based on C++ Builder 6.0 and SQL Server 2000, the system not only implements the process control of weighing and blending, but also realizes the production data storage and management. This paper analyzes the system function structure, describes the method of communication and introduces the means of data management. The application result indicates that this system improves the production efficiency and stabilizes the production process.
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