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Xigui Wang,Yongmei Wang,Yixiang Liu,Xinbo Zhang,Dayu Zheng 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
The minimum of tooth surface flash temperature and vibration acceleration RMS design is proposed and analyzed. The tooth contact analysis (TCA) and the load tooth contact analysis (LTCA) method and multi-objective optimization are also detailed. Satisfying design variables in multiple physical quantities leads to the minimum of multi-objective optimization. Considering the tooth surface loading conditions are uniform or not, the optimal modification of the tooth surface for improving gear comprehensive characteristics under various load bearing conditions is improved. The tooth surface flash temperature and vibration acceleration root mean square (RMS) values in different transmission modes of marine ship power rear gears drive system are derived. This research considers the multi-objective optimization modifications of tooth surface, and its main purpose is to propose an approach to help design tooth corrections to simultaneously optimize several objective physical quantities.
Study on super-harmonic resonance for gear transmission based on teeth surface friction
Xigui Wang,Yongmei Wang,Xuezeng Zhao,Xinglin Li 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Gear backlash and time-varying nonlinear meshing stiffness are the key design attributes of modern warship planetary gear transmission. The transmission prominent concern is teeth surface friction dynamics affect behavior and way. Therefore, the change of directionin meshing process, teeth surface friction will generate a larger oscillation, excitation response and energy consumption ways to affectdynamic characteristics of planetary gear transmission, which makes response range, dynamic behaviors more complex. Gear model andmulti scale equations for transmission are established, analyzing incentive role teeth surface friction when considering dynamic and staticload on influence law of gear resonance frequency response.
TEM fitting considering TEPs of contact interface of meshing gear
Xigui Wang,Siyuan An,Yongmei Wang,Jiafu Ruan,ShuE Ji 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
This topic aims to clarify the method of optimizing tooth surface modification (TSM) fitting under thermoelastic lubrication (TEL) conditions to reveal the most popular and concerning mechanism issues in mechanical engineering. A traditional TSM numerical method has played an increasingly important role in our basic understanding of thermoelastic properties (TEPs) under TEL conditions, which is undoubtedly affirmative and effective. This subject involves the TSM fitting of the theoretical tooth surface superimposed structure, and performs 3D and diagonal modification optimization design, obtains the modified surface position and normal vectors, a variety of optimized modification models are established and complex curved surfaces are analyzed to fit the actual Interface thermoelastic contact numerical simulation, which has been further demonstrated and expressed in actual key working conditions and multiple influencing parameters, thereby reducing transmission error and vibration noise in order to improve gear meshing thermoelastic anti-scuffing load-bearing performance (TEASLBP).
Analysis and research on teeth thermodynamic coupling contact of gear transmission system
Wang, Xigui,Wang, Yongmei,Zhao, Xuezeng,Li, Xinglin Techno-Press 2015 Coupled systems mechanics Vol.4 No.3
In the gear meshing process, gear temperature field concerns the meshing surface friction, the friction heat depends on the contact pressure, the contact pressure is affected by the elastic deformation of gears and the temperature field caused by the thermal deformation, so the temperature field, stress field and displacement field should be mutual coupling. It is necessary to consider in meshing gear pair in the operation process of thermodynamic coupling contact stress (TCCS) and thermodynamic coupling deformation (TCD), and based on thermodynamic coupling analysis (TCA) of gear teeth deformation.
Full-scale test of dampers for stay cable vibration mitigation and improvement measures
Zhou, Haijun,Xiang, Ning,Huang, Xigui,Sun, Limin,Xing, Feng,Zhou, Rui Techno-Press 2018 Structural monitoring and maintenance Vol.5 No.4
This paper reported test of full-scale cables attached with four types of dampers: viscous damper, passive Magneto-Rheological (MR) damper, friction damper and High Damping Rubber (HDR) damper. The logarithmic decrements of the cable with attached dampers were calculated from free vibration time history. The efficiency ratios of the mean damping ratios of the tested four dampers to theoretical maximum damping ratio were derived, which was very important for practical damper design and parameter optimization. Non-ideal factors affecting damper performance were discussed based on the test results. The effects of concentrated mass and negative stiffness were discussed in detail and compared theoretically. Approximate formulations were derived and verified using numerical solutions. The critical values for non-dimensional concentrated mass coefficient and negative stiffness were identified. Efficiency ratios were approximately 0.6, 0.6, and 0.3 for the viscous damper, passive MR damper and HDR damper, respectively. The efficiency ratio for the friction damper was between 0-1.0. The effects of concentrated mass and negative stiffness on cable damping were positive as both could increase damping ratio; the concentrated mass was more effective than negative stiffness for higher vibration modes.
Liao Yaoqing,Zheng Wei,Long Jiangqi,Xie Xigui,Hu Jun 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.4
In this paper, an improved grey Euclidean relational analysis method based on Euclidean distance was proposed, which was based on the traditional grey relational analysis method. This method was applied to the material-structure integrated design of the backrest skeleton of a car seat. Firstly, the steel backrest skeleton of a car seat was replaced by carbon fiber reinforced plastics (CFRP), and the backrest skeleton was designed as an integrated structure. Its weight was reduced by 1.69 kg (39.12 %) while still meeting various seat performance test requirements. Then, the effect of the ply design on the performance of car seats with CFRP was studied, and the optimal layer scheme of CFRP backrest skeleton of car seats was obtained by combining the grey Euclidean relational analysis method. Finally, the method proposed in this paper was compared with the widely used method. The results showed that the optimization schemes obtained by the two methods greatly improved performance indicators, especially L_R_2 which had an improvement rate of 13.31 %. Additionally, the proposed method reduced computing resources by 95 %, indicating its ability to effectively balance optimization results and calculation efficiency.