Natural Frequency Characteristic and Sensitivity Analysis of Heavy Load RV Reducer based on Dynamics Model by Ren Jun Yan Zicheng Zhang Qianghao He Wenhao

“…Taking the RV-550E heavy-load reducer as the research object, the natural frequency of the reducer is obtained by solving the dynamics equation, and the influence of the pin-tooth shell stiffness on the natural frequency of the system is analyzed, which provides the basis for the design of the pin-toothed shell. …”
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Analysis of the Fatigue Characteristic of 2K-H Wind Power Helical Planetary Gear Train by Mingming Su, Mutellip Ahmat, Xingwei Tao

“…The fatigue damage is concentrated at the contact between the planetary gear and the ring gear. When the tooth surface roughness is in the range of 1~2 μm， the fatigue life decreases with the increase of the roughness.…”
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Analysis of Gear Oil Churning Power Loss and Transmission Efficiency of Reducer by Guangze Zheng, Hang Yang, Tao Hao, Xiupeng Huang

“…The main factors affecting the gear churning power loss are speed，gear oil kinematic viscosity，oil depth，number of teeth，tooth width，gear helix angle and pressure angle，and the specific influence sensitivity of each factor is studied. …”
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Using Resin Infiltration Technique and Direct Composite Restorations for the Treatment of Carious Lesions with Different Depths by İsmail Serhat Sadıkoğlu

“…In contrast to the principles of minimally invasive dentistry, considerable amounts of sound tooth structure need to be sacrificed to get rid of these lesions. …”
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Temperature Field Analysis of Laser Hardening of 18CrNi8 Gear based on ANSYS by Hui Yinglong, Wang Yuling, Yao Cuicui

“…An ANSYS finite element analysis of temperature field is carried out aiming at laser quenching process of a large modulus gear used in the overloading car,which involve the establishment of 3D model,load method,command flow of moving heat source,longitudinal section temperature distribution,determination of the hardening layer depth.According to ANSYS Post-processing methods,the case of heat flow in the processing,the temperature variation of typical nodes along the scanning line of the heat source and the depth direction as well as the cause and the solution of the widely different temperature between the surface before and after the laser speckle（which is caused momentarily "heat flux accumulation effect"）are analyzed.The analysis results show that laser quenching on the gear tooth surface can achieve good effect,which is validated by the experiment.…”
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Dynamic Characteristic Analysis of Locomotive Traction Gear based on Simpack by Yuyu Sun, Ye Zhu, Tianmin Guan, Linlin Chai

“…The accuracy of the dynamics model of the traction gear pair is verified through the above studies，which provides a theoretical basis for the structural optimization design of the gearbox model and the study of the tooth modification of the traction gear.…”
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Contrast Experimental Study on the Contact Fatigue Life of Vibratory Finishing Gear by Wang Daoyong, Wang Tie, Zhang Ruiliang, Zhang Rui, Qiao Jinwei

“…The test results show that the vibration of finishing technology can improve the tooth surface finish,and also can improves the fatigue strength of gear effectively,what is more important,the life is prolonged apparently.…”
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Study on the Fault Diagnosis of Generator Unit based on WPD-Neural Network by Liu Zhigang, Zhao Xiaoyan, Zhang Tao, Ao Baolin, Li Simin, Dang Qiqian

“…Through analysis of gearbox under four types of normal condition,tooth surface wear,missing teeth and compound fault,show that the fault diagnosis method can distinguish the fault type in gearbox.…”
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EFFECTS OF INVOLUTE SPUR GEAR STRUCTURE PARAMETERS ON MESHING EFFICIENCY by ZHANG BaoFeng, CUI YaHui, LIU Kai, Dong YaWen

“…Based on the concept of contact counterforce between gear pair,the paper studied the meshing efficiency of involute spur gear mechanism,analyzed the effect factors of friction coefficient between contact tooth surfaces. Referring to the existent research models of friction coefficient,the paper discussed the meshing characteristics of spur gear and helical gear’s transmission,and derived the mathematic expressions of instantaneous meshing efficiency and average meshing efficiency for gear transmission of spur gear and helical gear. …”
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Study on the Dynamics of Non-circular Planetary Gear Hydraulic Motor by Wei Shuang, Li Dianqi, Liu Guanghui

“…The structure and working principle of a new type of non-circular planetary gear hydraulic motor are introduced. The pitch curve and tooth profile of each gear within non-circular planetary gear system are programmed. …”
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Fatigue Life Prediction Model of Cylindrical Gears Based on the Energy Accumulation Curve by Liu Shicong, Yang Jianwei, Li Xin, Gao Xiang

“…Through the gear bending fatigue test combined with the simulation results of the finite element model, the energy accumulation curve at the root of the tooth under different stress amplitudes is calculated. …”
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Research of Surface Reconstruction Method of Worm Gear Reverse Engineering based on Imageware and UG by Hongbin Yang, Guanyun Li, Ruiyi Li, Aijun Xu

“…The results show that the method of curve reconstruction surface can better meet the accuracy and smoothness requirements of the worm gear tooth surface. This method can quickly realize the accurate reconstruction of the three-dimensional model of the worm wheel， and a CAD model for the rapid remanufacturing of the worm wheel single piece and small batch is provided.…”
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3D Modeling Method and Strength Analysis of ZC₁ Worm by Jin Xiaoma, Ji Weixi

“…Through the data processing of finite element calculation results,the load distribution among gear teeth,the distribution of the contact stress along the direction of the worm gear tooth and the comparison between the results of the finite element method and the empirical strength formula are analyzed. …”
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Study on the High Precision Manufacturing of the Hourglass Worm Drive Pair in the Solar Tracking System by Chen Yan, Gong Yuxia

“…The precise 3D model of the hourglass worm tooth surface is established,and the contact areas are shown based on the graphics. …”
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Undercut Analysis of Cylindrical Helical Circular Arc Gear by Xiaoping Huang, Linlin Zhao

“…For cylindrical helical circular arc gears, the undercut boundary equation and no undercut condition are derived， and the undercut probability as well as determination of point most easy to be undercut at tooth profile and minimum number of teeth to avoid undercut are studied in detail. …”
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Multi-objective Optimization Design of RV Reducer Considering the Cycloid Gear Profile Modification by Wang Quan, Zeng Lilei, Qin Zhengzheng

“…In view of the fact that the influence of cycloid gear profile modification on contact force is not taken into account in the structural design of RV reducer，a multi-objective optimization design method for the structure of RV reducer considering cycloid gear profile modification is proposed.Combining the theory of tooth profile modification with the calculation of contact stress of cycloidal gear，considering the factors of volume，efficiency and contact stress，an optimization mathematical model with small volume，high efficiency and low contact stress of cycloidal gear as multi-objective function is established.The solution is carried out by using NSGA-II algorithm，and compared with single-objective optimization method.The results show that compared with the original design，the volume of RV reducer decreases by 21.24%，the efficiency increases by 2.03%，and the contact stress of cycloid wheel decreases by 20.26%.Meanwhile，the multi-objective optimization method has higher comprehensive performance than the single-objective optimization method.…”
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Analysis of Influence of Double-arc Flexspline Parameter on Flexspline Stress by Liang Ma, Bing Wu, Qi Shen, Guoyan Li

“…In order to optimize the structure of the flexspline in the double-arc harmonic reducer， the three-dimensional model of the flexspline with double arc tooth profile is established by using the SoildWorks software， and the deformation of the flexspline by the wave generator under the assembly condition is simulated by using the finite element method and the contact model is established. …”
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Fault Diagnosis of Wind Turbine Gearbox based on EEMD Wavelet Threshold Denoising and CS-BP Neural Network by Wang Hongjun, Zhao Yuanlu, Zhao Hui, Yue Youjun

“…For the fault diagnosis of the pitting,gear wear and tooth breakage in the gearbox of wind turbines,a fault diagnosis method based on EEMD and wavelet threshold denoising and cuckoo search to optimize BP neural network is proposed. …”
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A Curious Case Report of “Nosey” Calcification by S Padmavathi, G Anuradha, A Kannan, C L Krithika

“…The patient complained of tooth pain and sensitivity, with a history of sinusitis and hypertension. …”
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Research of 3D Comprehensive Modification of Transmission Gear by Zhou Xinjian, Mao Le, Li Guangxing

“…Based on the theoretical basis of helical gear axial modification and tooth profile modification,the optimum three-dimensional comprehensive modification parameters of the first gear are designed by applying the optimal Latin sampling principle. …”
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