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Chinese Journal of Mechanical Engineering 2023年第5期36卷 248-265页

作者： chaosheng song Feihong Zhu Xinzi Li Xuesong Du State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400030China

A three-dimensional conjugate tooth surface design method for Harmonic Drive with a double-circular-arc tooth profle is proposed. The radial deformation function of the fexspline (FS), obtained through Finite Element (FE) analysis, is incorporated into the kinematics model. By analyzing the FS tooth enveloping process, the optimization of the overlapping conjugate tooth profle is achieved. By utilizing the hobbing process, the three-dimensional machinable tooth surface of FS can be acquired. Utilizing the coning deformation of the FS, simulations are conducted to analyze the multi-section assembly and meshing motion of the machinable tooth surface. The FE method is utilized to analyze and compare the loaded contact characteristics. Results demonstrate that the proposed design method can achieve an internal gear pair consisting of a circular spline with a spur gear tooth surface and the FS with a machinable tooth surface. With the rated torque, approximately 24% of the FS teeth are engaged in meshing, and more than 4/5 of the tooth surface in the axial direction carries the load. The contact patterns, maximum contact pressure, and transmission error of the machinable tooth surface are 227.2%, 40.67%, and 71.24% of those on the spur gear tooth surface, respectively. It clearly demonstrates exceptional transmission performance.

关键词： Three-dimensional conjugate tooth surface Coning deformation Double-circular-arc tooth profle Harmonic Drive Contact characteristics

Mesh Force Modelling and Parametric Studies for Compound Oscillatory Roller Reducer

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 151-167页

作者： Changxu Wei chaosheng song Caichao Zhu Chengcheng Liang Long Hu The State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400030China

A compound oscillatory roller reducer(CORR)with a first-stage gear transmission and a second-stage oscillatory roller transmission is *** transmission principle of oscillatory roller transmission is introduced,and the tooth profile equation of the inner gear is *** analytical model of mesh force considering the installation errors and manufacturing errors is ***,parametric studies considering different errors on the mesh force are *** show that the design parameters are significant factors for mesh *** mesh force is reduced by 17%as the eccentricity of disk cam increases from 2.5 mm to 4 *** the radius of the movable roller increases from 7 mm to 20 mm,the mesh force decreases by 8%.As the radius of disk cam increases from 125 mm to 170 mm,the mesh force is decreased by 26.5%.For the impacts of errors,the mesh force has a noticeable fluctuation when these errors exist including the manufacturing error of disk cam,the installation error of disk cam and the manufacturing error of movable roller *** prototype of the reducer is manufactured and preliminary run-in test proved the feasibility of the transmission principle.

关键词： Compound oscillatory roller reducer Kinematic principle Mesh force modelling Misalignments Parametric study

Geometry Design and Tooth Contact Analysis of Crossed Beveloid Gears for Marine Transmissions

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Chinese Journal of Mechanical Engineering 2012年第2期25卷 328-337页

作者： ZHU Caichao song chaosheng LIM Teik Chin VIJAYAKAR Sandeep State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400030China School of Dynamics Systems at University of Cincinnati CincinnatiOhio 45221USA Advanced Numerical Solutions 3956 Brown Park DriveSuite BHilliardOhio 43026USA

Beveloid gears,also known as conical gears,gain more and more importance in industry practice due to their abilities for power transmission between parallel,intersected and crossed ***,this type of gearing with crossed axes has no common plane of action which results in a point contact and low tooth ***,a geometry design approach assuming line contact is developed to analyze the tooth engagement process of crossed beveloid gears with small shaft angle for marine transmission *** loaded gear tooth contact behavior is simulated by applying a quasi-static analysis to study the effects of gearing parameters on mesh *** the proposed method,a series of sensitivity analyses to examine the effects of critical gearing parameters such as shaft angle,cone angle,helix angle and profile-shift coefficient on the theoretical gear mesh is *** parametric analysis of pitch cone design shows that the dominant design parameters represented by the angle between the first principle directions（FPD） and normal angular factor are more sensitive to the shaft and cone angles than they are to the helix *** theoretical contact path is highly sensitive to the profile-shift coefficient,which is determined from the theoretical tooth contact *** FPD angle is found to change the distribution of contact pattern,contact pressure and root stress as well as the translational transmission error and the variation of the mesh stiffness *** contact pattern is clearly different between the drive and coast sides due to different designed FPD ***,a practical experimental setup for marine transmission is performed and tooth bearing test is conducted to demonstrate the proposed design *** experimental result compared well with the *** of this study yield a better understanding of the geometry design and loaded gear mesh characteristics for crossed beveloid gears used in marine trans

关键词： beveloid gears loaded tooth contact analysis crossed axes marine transmission

Effects of Flexibility and Suspension Configuration of Main Shaft on Dynamic Characteristics of Wind Turbine Drivetrain

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 224-238页

作者： Jianjun Tan Caichao Zhu chaosheng song Huali Han Yao Li The State Key Laboratory of Mechanical Transmissions Chongqing University CSIC (Chongqing) Haizhuang Windpower Equipment Co. Ltd

The current research of wind turbine drivetrain is mainly concentrated in dynamic characteristics of gearbox with a specific suspension of main shaft, such as one-point and two-point suspension. However, little attention is paid to the e ects of these suspension configurations on the dynamic responses of wind turbine gearbox. This paper investigates the influences of suspension configurations of main shaft on the dynamic characteristics of drivetrain. For evaluating the dynamic behaviors of drivetrain with multi-stage transmission system more realistically, a dynamic modeling approach of drivetrain is proposed based on Timoshenko beam theory and Lagrange's equation. Considering the flexibility and di erent suspension configurations of main shaft, time-varying mesh sti ness excitation, time-varying transmission error excitation and gravity excitation, etc., a three-dimensional dynamic model of drivetrain is developed, and the dynamic responses of drivetrain are investigated. Results show that with the one-point suspension of main shaft, the resonance frequencies in gearbox, especially at the low-speed stage, obviously shift to the higher frequency range compared to the gearbox without main shaft, but this trend could be inversed by increasing main shaft length. Meanwhile, the loads in main shaft, main shaft bearing and carrier bearing are greatly sensitive to the main shaft length. Hence, the load sharing is further disrupted by main shaft, but this e ect could be alleviated by larger load torque. Comparing to the one-point suspension of main shaft, there occurs the obvious load reduction at the low-speed stage with two-point suspension of main shaft. However, those advantages greatly depend on the distance between two main bearings, and come at the expense of increased load in upwind main shaft unit and the corresponding main bearing. Finally, a wind field test is conducted to verify the proposed drivetrain model. This study develops a numerical model of drivetrain

关键词： Wind turbine drivetrain Flexible shafts Suspension configuration Dynamic responses Experimental study

Effects of elastic support on the dynamic behaviors of the wind turbine drive train

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Frontiers of Mechanical Engineering 2017年第3期12卷 348-356页

作者： Shuaishuai WANG Caichao ZHU chaosheng song Huali HAN The State Key Laboratory of Mechanical Transmissions Chongqing University Chongqing 400030 China CSIC (Chongqing) Haizhuang Windpower Equipment Co. Ltd.Chongqing 401122 China

The reliability and service life of wind turbines are influenced by the complex loading applied on the hub, especially amidst a poor external wind environment. A three-point elastic support, which includes the main bearing and two torque arms, was considered in this study. Based on the flexibilities of the planet carrier and the housing, a coupled dynamic model was developed for a wind turbine drive train. Then, the dynamic behaviors of the drive train for different elastic support parameters were computed and analyzed. Frequency response functions were used to examine how different elastic support parameters influence the dynamic behaviors of the drive train. Results showed that the elastic support parameters considerably influenced the dynamic behaviors of the wind turbine drive train. A large support stiffness of the torque arms decreased the dynamic response of the planet carrier and the main bearing, whereas a large support stiffness of the main bearing decreased the dynamic response of planet carrier while increasing that of the main bearing. The findings of this study provide the foundation for optimizing the elastic support stiffness of the wind turbine drive train.

关键词： wind turbine drive train elastic support,dynamic behavior frequency response function

Microscopic impacts of ultrasonic vibration on interfacial strength of SiCp/Al composites

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CHINESE JOURNAL OF AERONAUTICS 2024年第12期37卷 574-587页

作者： Yuan, Zhaojie Xiang, Daohui Peng, Peicheng song, chaosheng Sang, Jinglong Zhang, Yu Gao, Guofu Zhao, Bo Henan Polytech Univ Sch Mech & Power Engn Jiaozuo 454000 Peoples R China

SiCp/Al composites are used in aerospace and deep-space exploration equipment because of their extremely high strength and thrust-to-weight ratios;however, the differences in the properties of the reinforcement and matrix materials in this type of composites have restricted their applications. The ultrahigh-frequency vibration characteristics of ultrasonic vibration processing technology can effectively solve the above bottlenecks, but the effect of high-frequency vibration on the interfacial properties of SiCp/Al composites is still unclear. The effects of ultrasonic vibration on the interface strength of composites were analyzed from a microscale perspective by means of single particle push-out Molecular Dynamics (MD) simulations and tests under different conditions. The results show that the interface strength is negatively correlated with particle size but positively correlated with ultrasonic amplitude, with a maximum increase of about 51% relative to no ultrasound. Brittle-plastic transition was observed on the surface of particles with high interface strength, and lateral microcracks due to stress concentration were present on the surface of particles with low interface strength. Higher strains and grain refinement were obtained for larger amplitudes, and stacking faults and tangle dislocations appeared on the side of the interface layer close to the Al matrix. The results provide potential insights to improve the micromechanical and mechanical properties of SiCp/Al composites, enhance the longevity of the materials, and realize the sustainable use of resources by expanding the efficient, precise, and clean machining of such materials. (c) 2024 The Author(s). Published by Elsevier Ltd on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： SiCp/Al composites Interface strength Single particle push-out Ultrasonic vibration MD simulations

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船用交错轴变厚齿轮啮合性能的研究

西安交通大学学报 2012年第11期46卷 64-68,105页

作者：宋朝省朱才朝刘立斌重庆大学机械传动国家重点实验室重庆400030

基于空间齿轮啮合原理和有限单元法,分别建立了船用交错轴变厚齿轮齿面模型及啮合模型.在承载和安装误差的作用下,对船用交错轴变厚齿轮传动啮合特性进行了分析,研究了中心距误差、轴交角误差和大齿轮轴向位置误差对啮合印痕、最大接触... 详细信息

基于空间齿轮啮合原理和有限单元法,分别建立了船用交错轴变厚齿轮齿面模型及啮合模型.在承载和安装误差的作用下,对船用交错轴变厚齿轮传动啮合特性进行了分析,研究了中心距误差、轴交角误差和大齿轮轴向位置误差对啮合印痕、最大接触压力、传动误差及啮合刚度的影响规律.结果表明,中心距和轴交角误差使得啮合印痕发生明显的偏移,造成最大接触压力及传动误差的峰峰值增加,且中心距及轴交角的正负误差对啮合刚度的影响呈相反的趋势,但大齿轮轴向位置的误差对啮合特性影响较小.通过加载啮合特性试验,验证了理论啮合分析结果的正确性,这对船用交错轴变厚齿轮传动匹配设计具有重要的指导意义.

关键词：变厚齿轮交错轴安装误差啮合特性

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含缺陷铝合金厚板预拉伸断裂研究

机械工程学报 2016年第12期52卷 30-36页

作者：丁华锋朱才朝宋朝省重庆大学机械传动国家重点实验室重庆400044

由于材料中存在空洞等缺陷,铝合金厚板在预拉伸过程中易发生断裂,对拉伸设备造成损伤。基于GTN损伤本构方程,建立铝合金板预拉伸断裂模型。基于小试件拉伸断裂试验测试结合数值模拟,确定GTN损伤本构参数,对五种典型厚度铝合金板预拉伸... 详细信息

由于材料中存在空洞等缺陷,铝合金厚板在预拉伸过程中易发生断裂,对拉伸设备造成损伤。基于GTN损伤本构方程,建立铝合金板预拉伸断裂模型。基于小试件拉伸断裂试验测试结合数值模拟,确定GTN损伤本构参数,对五种典型厚度铝合金板预拉伸断裂进行研究。计算铝合金板断裂过程中的应力应变及损伤变量的变化规律,并将表面位置和断裂截面位置处的各变量进行对比。结果表明,随着拉伸率的增大,铝合金板由平面应力状态变为应变集中,其部位由正中心位置向边缘偏移,空洞体积分数最大值也由正中心位置转移到应变集中处;随厚度增加断裂应变略有降低,且受初始空洞体积分数的影响较大。通过对不同厚度、不同拉伸率的铝合金板预拉伸分析,得到初始空洞体积分数和初始缺陷尺寸随厚度变化规律。

关键词：铝合金板预拉伸断裂材料缺陷 GTN本构方程

小交错角面铣准双曲面齿轮副的几何设计与啮合特性

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中国机械工程 2022年第13期33卷 1521-1528,1536页

作者：刘思远宋朝省朱才朝重庆大学机械传动国家重点实验室重庆400044

提出一种针对小交错角面铣准双曲面齿轮的几何设计方法,推导了基于单叶双曲面副瞬时轴线的空间节圆锥副设计参数几何关系,提出了考虑齿根平滑过渡的小交错角准双曲面齿轮副啮合特性控制方法。建立了齿轮副啮合模型与有限元分析模型,研... 详细信息

提出一种针对小交错角面铣准双曲面齿轮的几何设计方法,推导了基于单叶双曲面副瞬时轴线的空间节圆锥副设计参数几何关系,提出了考虑齿根平滑过渡的小交错角准双曲面齿轮副啮合特性控制方法。建立了齿轮副啮合模型与有限元分析模型,研究了不同外载荷对齿面啮合特性的影响。小交错角齿轮传动原理样机验证了准双曲面齿轮可在小交错角极端几何尺度下平稳工作。

关键词：小交错角准双曲面齿轮几何设计啮合特性样机验证

风电机组液压系统动态故障树的可靠性建模与评估

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太阳能学报 2018年第12期39卷 3584-3593页

作者：李垚朱才朝宋朝省谭建军重庆大学机械传动国家重点实验室

采用模糊数来表征基本事件的失效率参数,引入扩张原理和Laplace-Stieltjes变换方法求解风电机组液压系统状态转移方程组,得到模糊失效率对应的隶属度和模糊动态可靠度,对风电机组液压系统进行可靠性评估。对不同厂家液压产品进行可靠性... 详细信息

采用模糊数来表征基本事件的失效率参数,引入扩张原理和Laplace-Stieltjes变换方法求解风电机组液压系统状态转移方程组,得到模糊失效率对应的隶属度和模糊动态可靠度,对风电机组液压系统进行可靠性评估。对不同厂家液压产品进行可靠性评估,研究液压元件失效率参数对液压系统可靠性的影响,指出液压元件可靠度匹配对提高液压系统可靠性具有重要作用。通过对液压系统的可靠性建模和分析验证该方法在解决具有动态失效特征和失效概率具有不确定性问题的可行性。

关键词：风电机组液压模型故障树分析可靠性分析马尔科夫链模糊集