Papers by Author: Jin Yao

Abstract: Considering the weight and loading conditions of the multi-shaft transmission box, build the finite element model and mathematical model for the box using the finite element method. According to ANSYS WORKBENCH, calculate the boxs load capacity and stress and deformation distribution under 9 working conditions then evaluate its strength and rigidity. Optimize the structure of the box to reduce its weight. The results show that the optimized box meets the strength requirements. After optimization, the multi-shaft transmission box weights 176.578 kilograms, reduced by 30.26 percentages. It improves the stress and deformation distribution and makes the structure more reasonable. It also provides important theoretical significance and engineering practical value.

Abstract: Wire race ball bearing with large radial size and small axial size, saves space extremely, and is widely used in rotary devices of large machineries. This paper establishes a mathematical model of optimization design of rectangular cross-sectional wire race ball bearing,and considers minimum friction torque as objective function, and analyses constraints of contact intensity and design specifications of wire race ball bearing, and forges an optical design method that determines the number of balls, the diameter of ball, the contact angle and the diameter of ball center circle as optimal design parameters, to attain the purpose of extending bearings life. Comparing results of Optimization with original sample, the friction torque of ball that bears maximum load reduces by 10.20%. This method provides a reference for conducting further scientific researches on wear of wire race ball bearing.

Abstract: With the detailed force analysis of spiral spline transmission, the relationship of each force was derived. On the basis of this, referred to the designing and checking criterion of the straight-tooth spline transmission and spiral transmission, the calculation methods of the surface extrusion stress (or pressure) of the spiral spline teeth side, the shear stress and the max-flexural stress of the spiral spline teeth root, and the equivalent stress of the screw bolt were derived, and the checking criterions for them were put forward. An example, the surface extrusion stress through the calculation methods compared with that through ANSYS Workbench simulation, verifies the calculation methods of the surface extrusion stress (or pressure) of the spiral spline teeth side.

Abstract: In order to calculate the friction work of lock-up clutch, which come from the lock-up process of hydraulic torque converter, this article established a simplified dynamic model of the engine and hydraulic torque converter , according to the route of power transmission and the rule of moment balance. And then the mathematical model of the lock-up process was deduced. This article reached a calculation method of lock-up clutch friction work by the mathematical model , and did some further simplified. Meanwhile, the lock-up process was simulated by Matlab/Simulink. By analyzing the simulatin resultthe computed result of machinery bookthe computed result of the improved method, the correctness of the improved method was verified.

Abstract: In mechanisms manufacturing environment, factory management level is always trying to achieve higher product yield to ship more quality product to the customers. In this paper, we will show the yield improvement based on cycle time reduces. Yield organization has established excellent systems for driving defect reduction. Established a clear set of core principles that would help drive a new way of driving cycle time improvement. Discuss the key findings captured through yield benchmarking activities. There are three core principles outlined above and the associated changes made in manufacturing to embrace these principles.

Abstract: Collimators are used in radiosurgery or radiotherapy systems to accurately focus their high-energy rays on the target to avoid causing damage to the collateral healthy tissues. With the development of conformal radiotherapy techniques, variable visual field collimators (VVFC) are widely used and many designs of VVFC have been proposed. However, these designs still exhibit different deficiencies, e.g. unable to completely eliminate the radiation leakage due to the inter-block gaps. Therefore, in this paper, an innovative design of VVFC is proposed through analyzing the original VVFC, determining the conflicts and solving them using the inventive problem solving methods (TRIZ). Compared with the existing designs of VVFC, the proposed design enables the selection of suitable size of field for the treatment of different size of targets, and completely eliminates the radiation leakage due to inter-block gaps.

Abstract: Watermarks, which are often used as security features of banknotes to prevent counterfeiting, are made onto the banknote paper using the dandy roll that is a roller of copper net with white watermarks accurately welded on it. The positioning accuracy of the white watermarks on the copper net is critical. However, the current technologies are inefficient, inaccurate and/or expensive. Therefore, in this paper a novel design of automatic system for white watermark is proposed. It is realized by thorough analysis of the welding procedure of the white watermark, design of a novel mechanical structure for the automatic feeding and accurate positioning of the white watermark to its welding position on the copper net and integration with the available spot welder. Compared with the current technologies, the proposed design could greatly improve the efficiency and accuracy for welding the white watermarks, and its total cost is low. Therefore, the proposed design could be adopted in the banknote printing industry to realize the automatic welding of the white watermarks.

Abstract: An intelligent quality diagnosis method for process quality diagnosis and improvement was proposed to find out influencing input parameters for output quality and then provide suggestion for quality engineering to adjust them to acquire high quality performance. The diagnosis method extends the traditional quality control and diagnosis method that only for the output quality of manufacturing process. It can detect the input parameters of the manufacturing process and provide sensitivities of input parameter for adjustment. BN-MTY method was applied to explain the reason of quality failure in T² control chart and the root output quality indicators that aroused the process quality anomaly was located. The integrated method of neural network and sensitivity analysis was applied to get the weight and threshold value of neural cell in the forecasting network. his integrated quality diagnosis method can diagnose the input parameters and provide accurate sensitivities for quality improvement.

Abstract: Pin tumbler lock is widely used due to its important role in security. However, the existing pin tumbler locks are not safe enough as they can be easily opened by many specific tools. Although many pin tumbler lock patents have been proposed to enhance the security level, these revealed designs still exhibit different deficiencies. In addition, the traditional method for lock designing is of low efficiency as it is based on inspiration and experience. Therefore, the TRIZ tool, which is the inventive problem solving method, is applied to lock designing in this paper. An innovative design of magnetic pin tumbler lock has been proposed through analyzing the traditional pin tumbler lock system, finding contradictions and solving them by using TRIZ tools such as separation principle, inventive principle, contradiction matrix and substances - field analysis. The proposed magnetic pin tumbler lock is double encoded and can effectively prevent specific tools from opening.

Abstract: By combining the powerful self-learning ability of the neural network and the characteristic that the fuzzy control is designed based on the strategical rules of knowledge and language, this paper put forward the strategy of engineering vehicles' automatic transmission shift. According to a large number of experimental data, as well as the drivers' experience and the experts' profession, this paper put forward the strategy of engineering vehicles’ automatic transmission shift. The neural network model is set up based on Takagi-Sugeno and the factual cases are used to train and exam by MATLB, the simulation result showed that this method is feasible and meet the shift requirement, as it can accelerate effectively the establishment of the rules and reduce the set up time. The shift schedule can reflect precisely the actual out put target gear and meet the shift requirement.