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学者姓名：赵永胜
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Abstract ：
As a weak link, the joint surface of machine tools directly affects the stiffness and machining accuracy of the entire machine tool. However, obtaining the distribution of contact stress is a key problem that urgently needs to be solved in exploring the mechanical properties of joint surface connections. In this paper, a tangential contact stress ultrasonic testing method based on the equivalent medium theory is proposed, providing data support for accurately characterizing the contact state of the joint surface. A virtual material model of rough contact interface based on fractal theory is established to explore the coupling relationship between the propagation speed of ultrasonic critical refracted longitudinal waves, the tested object's material parameters, and stress. Moreover, the expression of the equivalent material parameters of the ultrasonic critical refracted longitudinal wave propagation layer with stress variation is derived. An ultrasonic acoustic time difference model considering changes in contact surface material parameters is constructed based on the principle of acoustic elasticity of ultrasound. Furthermore, a critical refractive detection model for longitudinal wave's tangential contact stress is established based on equivalent medium theory. Experimental specimens and stress detection plans are designed, and the tangential contact stress of the specimens is measured based on the division of surface grids. The equivalent stress value of each node is calculated based on the von Mises stress by measuring the stress in the X/Y direction. In addition, a shear stress distribution cloud map of the contact surface is drawn. Finally, the accuracy of the detection results is confirmed by combining theory, simulation, and experimental methods. The proposed tangential contact stress detection method based on critical refractive longitudinal waves is significant for lowstress assemblies.
Keyword ：
Contact characteristics Contact characteristics Critical refracted longitudinal waves Critical refracted longitudinal waves Contact stress Contact stress Ultrasonic testing Ultrasonic testing
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| GB/T 7714 | Niu, Nana , Zhao, Yongsheng , Liu, Zhifeng et al. Research on ultrasonic testing method for tangential contact stress based on equivalent medium theory [J]. | ULTRASONICS SONOCHEMISTRY , 2025 , 112 . |
| MLA | Niu, Nana et al. "Research on ultrasonic testing method for tangential contact stress based on equivalent medium theory" . | ULTRASONICS SONOCHEMISTRY 112 (2025) . |
| APA | Niu, Nana , Zhao, Yongsheng , Liu, Zhifeng , Li, Ying , Liu, Lele . Research on ultrasonic testing method for tangential contact stress based on equivalent medium theory . | ULTRASONICS SONOCHEMISTRY , 2025 , 112 . |
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Abstract ：
The size and distribution of the contact stress at the assembly interface will directly affect the connection performance of the mechanical joint. However, the rough assembly interface presents strong dielectric discontinuity and material nonlinearity, which become the bottleneck restricting the development of contact stress detection. How to obtain contact stress by nondestructive testing means has become an urgent problem to be solved. In this paper, a multi-layer interface contact stress detection method based on contact acoustic resistance model is proposed to solve the difficult problem of rough interface contact stress detection. Firstly, based on the formation mechanism of contact acoustic resistance of rough assembly interface, the equivalent contact acoustic resistance expression of contact layer is derived. Secondly, the contact mechanism of rough assembly interface is clarified, and the mapping relationship model between contact acoustic resistance and contact stress is constructed. On this basis, according to the transmission law of ultrasonic wave at different interfaces of multilayer acoustic impedance, the expression of acoustic transmission coefficient at the interface of variable acoustic impedance is obtained. A contact stress detection method based on contact stress-contact acoustic resistance coefficient and acoustic transmission coefficient is proposed. The correctness of the theoretical model is verified by the tensile testing machine, and the maximum error is 15.52 %. This method will provide powerful data support for the evaluation of assembly interface connection state.
Keyword ：
Contact stress Contact stress Contact acoustic resistance Contact acoustic resistance Ultrasonic detection Ultrasonic detection Assembly interface Assembly interface
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| GB/T 7714 | Nana, Niu , Yongsheng, Zhao , Zhifeng, Liu et al. Contact stress ultrasonic detection method based on contact acoustic resistance model [J]. | TRIBOLOGY INTERNATIONAL , 2024 , 199 . |
| MLA | Nana, Niu et al. "Contact stress ultrasonic detection method based on contact acoustic resistance model" . | TRIBOLOGY INTERNATIONAL 199 (2024) . |
| APA | Nana, Niu , Yongsheng, Zhao , Zhifeng, Liu , Ying, Li , Lele, Liu . Contact stress ultrasonic detection method based on contact acoustic resistance model . | TRIBOLOGY INTERNATIONAL , 2024 , 199 . |
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Abstract ：
The performance-degradation pattern of the planetary roller screw mechanism (PRSM) is difficult to predict and evaluate due to a variety of factors. Load-carrying capacity, transmission accuracy, and efficiency are the main indicators for evaluating the performance of the PRSM. In this paper, a testing device for the comprehensive performance of the PRSM is designed by taking into account the coupling relationships among temperature rise, vibration, speed, and load. First, the functional design and error calibration of the testing device were conducted. Secondly, the PRSM designed in the supported project was taken as the research object to conduct degradation tests on its load-bearing capacity and transmission accuracy and analyze the changes in transmission efficiency. Third, the thread profile and wear condition were scanned and inspected using a universal tool microscope and an optical microscope. Finally, based on the monitoring module of the testing device, the vibration status during the PRSM testing process was collected in real time, laying a foundation for the subsequent assessment of the changes in the performance state of the PRSM. The test results reveal the law of performance degradation of the PRSM under the coupled effects of temperature, vibration, speed, and load.
Keyword ：
performance degradation performance degradation efficiency efficiency planetary roller screw mechanism planetary roller screw mechanism carrying capacity carrying capacity transmission accuracy transmission accuracy condition monitoring condition monitoring
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| GB/T 7714 | Chen, Kui , Zhao, Yongsheng , Zheng, Jigui et al. Performance-Degradation Analysis of the Planetary Roller Screw Mechanism under Multi-Factor Coupling Effects [J]. | SENSORS , 2024 , 24 (14) . |
| MLA | Chen, Kui et al. "Performance-Degradation Analysis of the Planetary Roller Screw Mechanism under Multi-Factor Coupling Effects" . | SENSORS 24 . 14 (2024) . |
| APA | Chen, Kui , Zhao, Yongsheng , Zheng, Jigui , Shi, Wei , Zhang, Zhaojing . Performance-Degradation Analysis of the Planetary Roller Screw Mechanism under Multi-Factor Coupling Effects . | SENSORS , 2024 , 24 (14) . |
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Abstract ：
Time-varying loads, manufacturing errors, and assembly errors are the main factors leading to the performance degradation of the planetary roller screw mechanism. This paper proposes a comprehensive analysis method for the performance degradation of the planetary roller screw mechanism caused by time-varying loads and manufacturing and assembly errors. Firstly, a simulation analysis model of the planetary roller screw mechanism was established and its effectiveness was verified. A quantitative analysis was conducted on the influence of manufacturing and assembly errors on the load distribution, revealing the load-bearing mechanism under the influence of errors. Secondly, loading experiments were conducted on the planetary roller screw mechanism, and the degradation of its load-bearing performance was divided into the normal degradation stage, the accelerated degradation stage, and the failure stage. The experimental results prove that the initial transmission accuracy has a significant impact on the degradation of the load-bearing performance, determining the occurrence of the node where the accelerated degradation stage appears in the load-bearing performance. Thirdly, the wear status of the threads and gears was examined, and the results showed that material peeling was the main factor causing the degradation of load-bearing performance.
Keyword ：
load distribution load distribution Planetary roller screw mechanism Planetary roller screw mechanism performance degradation performance degradation assembly errors assembly errors Manufacturing errors Manufacturing errors
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| GB/T 7714 | Chen, Kui , Zhao, Yongsheng , Zheng, Jigui et al. A comprehensive analysis method of the performance degradation of planetary roller screws under the time-varying load and errors [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2024 , 238 (21) : 10373-10390 . |
| MLA | Chen, Kui et al. "A comprehensive analysis method of the performance degradation of planetary roller screws under the time-varying load and errors" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 238 . 21 (2024) : 10373-10390 . |
| APA | Chen, Kui , Zhao, Yongsheng , Zheng, Jigui , Wang, Jianhui , Dou, Yongqiang . A comprehensive analysis method of the performance degradation of planetary roller screws under the time-varying load and errors . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2024 , 238 (21) , 10373-10390 . |
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Abstract ：
针对传统对接方法在缺少现场实测数据支持下的被动调整问题，提出基于数字孪生的机身对接精度优化控制方法.基于数字孪生虚实结合技术，研究机身对接工艺优化反馈控制技术. 搭建融合冗余控制算法和工艺优化策略的数字孪生系统，明确了基于现场实测数据的测量-优化-反馈精度优化流程. 基于有限状态机理论，精准重建数字孪生模型，实现对接过程的监控和精度预测，根据同轴度评价指标完成工艺参数二次设计，将优化后的工艺参数重新下发至物理现场、控制现场进行对接. 对接位姿偏差对比结果表明：对接精度优化控制方法将机身筒段位置偏差降低了60.03%，姿态偏差降低了53.94%.
Keyword ：
模型重构 模型重构 优化控制 优化控制 数字孪生 数字孪生 机身对接 机身对接 参数优化 参数优化
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| GB/T 7714 | 赵永胜 , 赵志勇 , 李迎 et al. 基于数字孪生的机身对接精度优化控制方法 [J]. | 浙江大学学报(工学版) , 2023 , 57 (5) : 883-891 . |
| MLA | 赵永胜 et al. "基于数字孪生的机身对接精度优化控制方法" . | 浙江大学学报(工学版) 57 . 5 (2023) : 883-891 . |
| APA | 赵永胜 , 赵志勇 , 李迎 , 张涛 . 基于数字孪生的机身对接精度优化控制方法 . | 浙江大学学报(工学版) , 2023 , 57 (5) , 883-891 . |
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Abstract ：
This study describes an intelligent method for modeling and optimization of piezoelectric ejection system design for additive manufacturing. It is a combination of neural network (NN) techniques and finite element simulation (FES) that allows designing each parameter of a piezoelectric ejection system faster and more reliably than conventional methods. Using experimental and literature data, a FE model of the droplet ejection process was developed and validated to predict two indexes of droplet ejection behavior (DEB): jetting velocity and droplet diameter. Two artificial neural network (ANN) models based on feed-forward back propagation were developed and optimized by genetic algorithm (GA). A database was established by FE calculations, and the models were trained to establish the relationship between the piezoelectric ejection system design input parameters and each DEB indicator. The results show that both NN models can independently predict the droplet jetting velocity and droplet diameter values from the training and testing data with high accuracy to determine the optimal piezoelectric ejection system design. Finally, the accuracy of the prediction results of the FES and ANN-GA models was verified experimentally. It was found that the errors between the predicted and experimental results were 4.48% and 3.18% for the jetting velocity and droplet diameter, respectively, verifying that the optimization method is reliable and robust for piezoelectric ejection system design optimization.
Keyword ：
piezoelectric ejection system design piezoelectric ejection system design FE simulation FE simulation additive manufacturing additive manufacturing droplet ejection behavior droplet ejection behavior neural networks neural networks
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| GB/T 7714 | Li, Xin , Zhao, Yongsheng . Intelligent Optimization Method of Piezoelectric Ejection System Design Based on Finite Element Simulation and Neural Network [J]. | 3D PRINTING AND ADDITIVE MANUFACTURING , 2023 . |
| MLA | Li, Xin et al. "Intelligent Optimization Method of Piezoelectric Ejection System Design Based on Finite Element Simulation and Neural Network" . | 3D PRINTING AND ADDITIVE MANUFACTURING (2023) . |
| APA | Li, Xin , Zhao, Yongsheng . Intelligent Optimization Method of Piezoelectric Ejection System Design Based on Finite Element Simulation and Neural Network . | 3D PRINTING AND ADDITIVE MANUFACTURING , 2023 . |
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Abstract ：
The bolted joint is widely used in heavy-duty CNC machine tools, which has huge influence on working precision and overall stiffness of CNC machine. The process parameters of group bolt assembly directly affect the stiffness of the connected parts. The dynamic model of bolted joints is established based on the fractal theory, and the overall stiffness of joint surface is calculated. In order to improve the total stiffness of bolted assembly, an improved particle swarm optimization algorithm with combination of time-varying weights and contraction factor is proposed. The input parameters are preloading of bolts, fractal dimension, roughness, and object thickness. The main goal is to maximize the global rigidity. The optimization results show that improved algorithm has better convergence, faster calculation speed, preferable results, and higher optimization performance than standard particle swarm optimization algorithm. Moreover, the global rigidity optimization is achieved.
Keyword ：
fractal theory fractal theory bolt connection bolt connection particle swarm optimization algorithm particle swarm optimization algorithm bolted joint bolted joint
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| GB/T 7714 | Chen, Kui , Yang, Cheng , Zhao, Yongsheng et al. Optimization of Square-shaped Bolted Joints Based on Improved Particle Swarm Optimization Algorithm [J]. | EKSPLOATACJA I NIEZAWODNOSC-MAINTENANCE AND RELIABILITY , 2023 , 25 (3) . |
| MLA | Chen, Kui et al. "Optimization of Square-shaped Bolted Joints Based on Improved Particle Swarm Optimization Algorithm" . | EKSPLOATACJA I NIEZAWODNOSC-MAINTENANCE AND RELIABILITY 25 . 3 (2023) . |
| APA | Chen, Kui , Yang, Cheng , Zhao, Yongsheng , Niu, Peng , Niu, NaNa , Wu, Hongchao . Optimization of Square-shaped Bolted Joints Based on Improved Particle Swarm Optimization Algorithm . | EKSPLOATACJA I NIEZAWODNOSC-MAINTENANCE AND RELIABILITY , 2023 , 25 (3) . |
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Abstract ：
本发明公开了一种螺栓预紧力评估方法及其动态参数测量装置，该方法包括：考虑恒定和动态参数，建立基于能量法的螺栓预紧力评估模型；获取栓接结构几何尺寸、测点翘曲位移与材料物理属性参数数据；根据所述测点翘曲位移及其与拧紧螺栓轴线距离确定薄板角位移；基于所述参数数据、角位移和评估模型确定螺栓预紧力。此外，该装置包括测点翘曲位移和螺栓预紧力测量系统。本发明提供的技术方案通过对螺栓预紧力的有效评估，能提高结构可靠性设计水平，为机械装备高性能装配及使役性能提升提供了理论依据，可减低维护成本。
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| GB/T 7714 | 王月珍 , 刘志峰 , 李迎 et al. 一种螺栓预紧力评估方法及其动态参数测量装置 : CN202310045579.2[P]. | 2023-01-30 . |
| MLA | 王月珍 et al. "一种螺栓预紧力评估方法及其动态参数测量装置" : CN202310045579.2. | 2023-01-30 . |
| APA | 王月珍 , 刘志峰 , 李迎 , 赵永胜 , 闫兴 , 陈文涛 . 一种螺栓预紧力评估方法及其动态参数测量装置 : CN202310045579.2. | 2023-01-30 . |
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Abstract ：
螺栓连接结合面的接触特性是影响机械系统动静态特性的关键。当结合面处于振动疲劳状态时,会导致阻尼增大和共振频率减小,因此建立精确的栓接结合面接触模型对研究整个机床的动态特性有着十分重要的意义。结合Greenwood和Williamson给出的塑性指数表达式、统计学的粗糙度参数和分形参数,建立了与微凸体频率序数相关的塑性指数模型,从而根据塑性指数得到微凸体弹性-弹塑性-塑性变形的临界频率序数,并基于赫兹接触理论,通过对不同频率区间内微凸体的积分得到整个结合面的接触载荷和接触刚度。最后,通过有限元仿真与试验相结合共同验证了理论模型的正确性,证明该理论模型具有较强的工程应用价值。
Keyword ：
结合面 结合面 频率序数 频率序数 分形理论 分形理论 接触刚度 接触刚度 塑性指数 塑性指数
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| GB/T 7714 | 赵永胜 , 牛娜娜 , 杨聪彬 et al. 基于多尺度下塑性指数模型的结合面接触刚度计算方法 [J]. | 振动与冲击 , 2022 , 41 (03) : 115-122,164 . |
| MLA | 赵永胜 et al. "基于多尺度下塑性指数模型的结合面接触刚度计算方法" . | 振动与冲击 41 . 03 (2022) : 115-122,164 . |
| APA | 赵永胜 , 牛娜娜 , 杨聪彬 , 刘志峰 , 姜凯 , 孟令军 . 基于多尺度下塑性指数模型的结合面接触刚度计算方法 . | 振动与冲击 , 2022 , 41 (03) , 115-122,164 . |
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Abstract ：
Ultrasonic testing is a common non-destructive testing technique for determining axial stress in bolted structures. The key issue is the accuracy of the test results needs to be further improved. In order to explore the influence factors of ultrasonic wave on the axial stress detection of bolts, the axisymmetric two-dimensional finite element model of bolted structure was established by COMSOL Multiphysics. The bolt is made of a hyperelastic material with a third-order elastic constant of Moanghan The ultrasonic transceiver is modeled and the ultrasonic excitation signal is determined. Coupling analysis of structure field and sound field is carried out to study the influence of different factors on ultrasonic testing results. The results show that the axial load has a linear relationship with the acoustic wave propagation time. The greater the axial load is, the longer the ultrasonic echo takes. The acoustic elasticity coefficients are different when the second and third-order elastic moduli that affect the speed of sound are different in the material, resulting in different sound velocities. Different bolt clamping lengths correspond to different internal stress distribution states of the bolts, and the corresponding sound velocities are quite different. Under the same load, the longer the clamping length, the longer the ultrasonic echo takes. The established model and the analysis results have important reference value for the development and application of the equipment of ultrasonic testing bolt stress.
Keyword ：
COMSOL COMSOL bolt stress bolt stress Ultrasonic Ultrasonic
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| GB/T 7714 | Zhao, Yongsheng , Liu, Pan , Niu, Nana . Finite Element Numerical Analysis on Ultrasonic Testing of Bolt Stress [J]. | INTERNATIONAL CONFERENCE ON MECHANICAL DESIGN AND SIMULATION (MDS 2022) , 2022 , 12261 . |
| MLA | Zhao, Yongsheng et al. "Finite Element Numerical Analysis on Ultrasonic Testing of Bolt Stress" . | INTERNATIONAL CONFERENCE ON MECHANICAL DESIGN AND SIMULATION (MDS 2022) 12261 (2022) . |
| APA | Zhao, Yongsheng , Liu, Pan , Niu, Nana . Finite Element Numerical Analysis on Ultrasonic Testing of Bolt Stress . | INTERNATIONAL CONFERENCE ON MECHANICAL DESIGN AND SIMULATION (MDS 2022) , 2022 , 12261 . |
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