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学者姓名:石照耀
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Abstract :
To date, overcoming the trade-off between high solid loading and print accuracy and strength, achieving high -performance and fine ZrO2 micro-ceramic components through vat photopolymerization 3D printing remains challenging. In this study, the effects of dispersant, particle size and solid content on the dispersion, rheological behavior and stability of ZrO2 ceramic slurry were systematically studied, and complex, fine and high -performance ZrO2 micro-ceramic gears were successfully prepared. Then, the microstructure, mechanical properties, tribological properties and surface quality were evaluated. The results show that the rheological behavior of the slurry is the best when the optimal dispersant content is 3.5 wt%. With the increase of solid content, the sintering shrinkage of ZrO2(3Y)/Al2O3 ceramics decreased, while the relative density, compressive strength, flexural strength, fracture toughness and hardness increased. The prepared micro-ceramic gears not only have fine structure, but also have dense microstructure and good mechanical properties. The relative density, compressive strength, flexural strength, fracture toughness and hardness strength of ZrO2(3Y)/Al2O3 ceramics can reach 98.53 %, 1900 MPa, 648 MPa, 6.4 MPa x m1/2 and 13.40 GPa, respectively. In particular, this study couples the printing accuracy and strength with the solid load. By adjusting the relationship between the fixed load and the shrinkage rate, the printing of samples with different sizes is realized, which breaks through the accuracy limit of the printing equipment and provides a new idea for the preparation of micro-ceramic gears.
Keyword :
Ceramic gear Ceramic gear Vat photopolymerization Vat photopolymerization Microstructure Microstructure Property Property 3D printing 3D printing
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GB/T 7714 | Zhang, Lizheng , Zeng, Yong , Yao, Haihua et al. Fabrication and characterization of ZrO2(3Y)/Al2O3 micro-ceramic gears with high performance by vat photopolymerization 3D printing [J]. | CERAMICS INTERNATIONAL , 2023 , 50 (3) : 5187-5197 . |
MLA | Zhang, Lizheng et al. "Fabrication and characterization of ZrO2(3Y)/Al2O3 micro-ceramic gears with high performance by vat photopolymerization 3D printing" . | CERAMICS INTERNATIONAL 50 . 3 (2023) : 5187-5197 . |
APA | Zhang, Lizheng , Zeng, Yong , Yao, Haihua , Shi, Zhaoyao , Chen, Jimin . Fabrication and characterization of ZrO2(3Y)/Al2O3 micro-ceramic gears with high performance by vat photopolymerization 3D printing . | CERAMICS INTERNATIONAL , 2023 , 50 (3) , 5187-5197 . |
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Abstract :
The friction factor of harmonic reducers affects the transmission accuracy in electromechanical actuators (EMAs). In this study, we proposed a friction feedforward compensation method based on improved active disturbance rejection control (IADRC). A mathematical model of EMA was developed. The relationship between friction torque and torque current was derived. Furthermore, the compound ADRC control method of second-order speed loop and position loop was studied, and an IADRC control method was proposed. A real EMA was developed, and the working principles of the EMA driving circuit and current sampling were analyzed. The three methods-PI, ADRC, and IADRC-were verified by conducting speed step experiments and sinusoidal tracking experiments. The integral values of time multiplied by the absolute error of the three control modes under the step speed mode were approximately 47.7, 32.1, and 15.5, respectively. Disregarding the inertia of the reducer and assuming that the torque during no-load operation equals the friction torque during constant motion, the findings indicate that, under a load purely driven by inertia, the IADRC control method enhances tracking accuracy.
Keyword :
ADRC ADRC friction compensation friction compensation PMSM PMSM integrated electromechanical actuator integrated electromechanical actuator
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GB/T 7714 | Zhang, Pan , Shi, Zhaoyao , Yu, Bo . Research on Friction Compensation Method of Electromechanical Actuator Based on Improved Active Disturbance Rejection Control [J]. | ACTUATORS , 2023 , 12 (12) . |
MLA | Zhang, Pan et al. "Research on Friction Compensation Method of Electromechanical Actuator Based on Improved Active Disturbance Rejection Control" . | ACTUATORS 12 . 12 (2023) . |
APA | Zhang, Pan , Shi, Zhaoyao , Yu, Bo . Research on Friction Compensation Method of Electromechanical Actuator Based on Improved Active Disturbance Rejection Control . | ACTUATORS , 2023 , 12 (12) . |
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Abstract :
The complete and accurate acquisition of geometric information forms the bedrock of maintaining high-end instrument performance and monitoring product quality. It is also a prerequisite for achieving the 'precision' and 'intelligence' that the manufacturing industry aspires to achieve. Industrial microscopes, known for their high accuracy and resolution, have become invaluable tools in the precision measurement of small components. However, these industrial microscopes often struggle to demonstrate their advantages when dealing with complex shapes or large tilt angles. This paper introduces a ray-tracing model for point autofocus microscopy, and it provides the quantified relationship formula between the maximum acceptable tilt angle and the beam offset accepted in point autofocus microscopy, then analyzing the maximum acceptable tilt angle of the objects being measured. This novel approach uses the geometric features of a high-precision reference sphere to simulate the tilt angle and displacement of the surface under investigation. The research findings show that the maximum acceptable tilt angles of a point autofocus microscope vary across different measured directions. Additionally, the extent to which the maximum acceptable tilt angles are affected by the distances of the beam offset also varies. Finally, the difference between the experiment results and the theoretical results is less than 0.5 degrees.
Keyword :
small components small components maximum acceptable tilt angle maximum acceptable tilt angle complex components complex components reference sphere reference sphere point autofocus microscopy point autofocus microscopy
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GB/T 7714 | Song, Huixu , Li, Qingwei , Shi, Zhaoyao . Maximum Acceptable Tilt Angle for Point Autofocus Microscopy [J]. | SENSORS , 2023 , 23 (24) . |
MLA | Song, Huixu et al. "Maximum Acceptable Tilt Angle for Point Autofocus Microscopy" . | SENSORS 23 . 24 (2023) . |
APA | Song, Huixu , Li, Qingwei , Shi, Zhaoyao . Maximum Acceptable Tilt Angle for Point Autofocus Microscopy . | SENSORS , 2023 , 23 (24) . |
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Abstract :
The torsional stiffness of the reducer is commonly assumed to be static and tested using the hysteresis curve method. However, practical engineering experience shows that the torsional stiffness is dynamic rather than static, and the hysteresis curve method cannot accurately represent the reducer's torsional stiffness during actual operation. To address these issues, this study conducts theoretical research on the dynamic characteristics of torsional stiffness, introduces a new concept called dynamic torsional stiffness, and provides its analytical formula. A dynamic torsional stiffness testing method based on the transmission error method is proposed, and its feasibility and consistency with the hysteresis curve method are theoretically demonstrated. This method allows the torsional stiffness information of the reducer to be obtained under all operating conditions. Through experimental research, the limitations of the hysteresis curve method are explained, and the dynamic characteristics of the reducer's torsional stiffness, along with the effectiveness of the transmission error method, are verified. Consequently, the torsional stiffness information of the reducer under all operating conditions is obtained. In conclusion, this method is valuable for both theoretical and engineering applications, as it offers a more accurate representation of the dynamic torsional stiffness of the reducer in real-world scenarios.
Keyword :
reducer reducer static torsional stiffness static torsional stiffness dynamic torsional stiffness dynamic torsional stiffness transmission error transmission error hysteresis curve hysteresis curve
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GB/T 7714 | Cheng, Huiming , Shi, Zhaoyao , Yu, Zhiyong et al. Dynamic Torsional Stiffness of Reducers and Its Testing Method [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (16) . |
MLA | Cheng, Huiming et al. "Dynamic Torsional Stiffness of Reducers and Its Testing Method" . | APPLIED SCIENCES-BASEL 13 . 16 (2023) . |
APA | Cheng, Huiming , Shi, Zhaoyao , Yu, Zhiyong , Zuo, Guangxiang . Dynamic Torsional Stiffness of Reducers and Its Testing Method . | APPLIED SCIENCES-BASEL , 2023 , 13 (16) . |
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Abstract :
Line laser measurement technology is effective for obtaining the 3D point clouds of complex surfaces. Thus, a 3D gear measurement model is established in this study. All the point clouds of gear surfaces are rapidly obtained using a line laser sensor, and the holistic deviations of gear surfaces are acquired by calculating the normal errors of the gear surface. These informative and complete data include traditional gear error items and considerable valuable information that is not deconstructed. To exploit the acquired gear holistic deviations, the structured 3D model is constructed to express tooth surface errors. In this model, the control method of the statistical process is used to define highly representative assessment indicators, and a new gear accuracy assessment system is developed by selecting reasonable indicators. The measurement practice shows that this method exploits the complete information of the gear surface, including all the current accuracy assessment indicators, which can be used to expand the new assessment indicators. This method can be used to characterize the 3D topological tooth surface completely and comprehensively and realize the deep mining and extended applications of the 3D full information of gear surfaces.
Keyword :
gear accuracy assessment gear accuracy assessment gear gear line laser measurement line laser measurement gear measurement gear measurement gear holistic deviations gear holistic deviations
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GB/T 7714 | Shi, Zhaoyao , Sun, Yanqiang , Wang, Xiaoyi et al. Acquisition and Assessment of Gear Holistic Deviations Based on Laser Measurement [J]. | PHOTONICS , 2022 , 9 (10) . |
MLA | Shi, Zhaoyao et al. "Acquisition and Assessment of Gear Holistic Deviations Based on Laser Measurement" . | PHOTONICS 9 . 10 (2022) . |
APA | Shi, Zhaoyao , Sun, Yanqiang , Wang, Xiaoyi , Zhao, Baoya , Song, Huixu . Acquisition and Assessment of Gear Holistic Deviations Based on Laser Measurement . | PHOTONICS , 2022 , 9 (10) . |
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Abstract :
Compared with contact measurement, machine vision inspection, a noncontact measurement, has the advantages of high efficiency, complete information, good stability, and recognizable defects. It has been used increasingly in the field of gear inspection. Many gear inspection instruments based on machine vision technology have been developed in the last 10 years, including video measuring machines, flash measuring machines, CVGM instruments, and online inspection equipments that can perform both comprehensive gear inspection and analytical gear measurement. This paper examines the development processes and characteristics of gear visual inspection instruments; analyzes the research and application progress of algorithms such as edge detection, subpixel positioning, feature extraction, and pattern recognition in gear visual inspection; summarizes the technical development of machine vision in gear accuracy measurement and gear defect inspection; and identifies the future development prospects of gear visual inspection instruments and technology.
Keyword :
gear measurement gear measurement machine vision machine vision gear visual inspection instrument gear visual inspection instrument gear accuracy measurement gear accuracy measurement gear defect inspection gear defect inspection
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GB/T 7714 | Shi Zhaoyao , Fang Yiming , Wang Xiaoyi . Research Progress in Gear Machine Vision Inspection Instrument and Technology [J]. | LASER & OPTOELECTRONICS PROGRESS , 2022 , 59 (14) . |
MLA | Shi Zhaoyao et al. "Research Progress in Gear Machine Vision Inspection Instrument and Technology" . | LASER & OPTOELECTRONICS PROGRESS 59 . 14 (2022) . |
APA | Shi Zhaoyao , Fang Yiming , Wang Xiaoyi . Research Progress in Gear Machine Vision Inspection Instrument and Technology . | LASER & OPTOELECTRONICS PROGRESS , 2022 , 59 (14) . |
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Abstract :
Tooth flank twist is a common phenomenon in the helical crowning modification of helical cylindrical gear, which reduces the performance of the gear. At present, the measurement of tooth flank twist is still in the stage of replacing surface with line. The development of 3-D measurement technology makes the acquisition of gear information more comprehensive and complete. By processing the 3-D point cloud data, the twist deviation on the tooth flank can be found, which is particularly important for improving the quality of the tooth flank. In this paper, a characterization method of tooth flank twist based on orthogonal polynomials was proposed, which can effectively separate the twist deviations existing on the tooth flank. The correctness of the method was verified by measurement experiments. Taking worm grinding wheel grinding to process helical crowning modification as an example, the model of various parameters of the gear and the amount of twist was established and the twist deviation in processing was predicted. This provides a new method for eliminating the twist deviation of the tooth flank.
Keyword :
orthogonal polynomials orthogonal polynomials gear modification gear modification 3-D deviation characterization 3-D deviation characterization gear measurement gear measurement tooth flank twist tooth flank twist
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GB/T 7714 | Zhao, Baoya , Yu, Bo , Shi, Zhaoyao et al. Research on Tooth Flank Twist Based on Orthogonal Polynomials Characterization [J]. | MACHINES , 2022 , 10 (7) . |
MLA | Zhao, Baoya et al. "Research on Tooth Flank Twist Based on Orthogonal Polynomials Characterization" . | MACHINES 10 . 7 (2022) . |
APA | Zhao, Baoya , Yu, Bo , Shi, Zhaoyao , Sun, Yanqiang , Wu, Guoqing . Research on Tooth Flank Twist Based on Orthogonal Polynomials Characterization . | MACHINES , 2022 , 10 (7) . |
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Abstract :
Owing to the difficulty in processing and measuring large involute artifacts, the value transfer of large gears remains a challenge. In this study, by replacing the involute tooth profile with an arc, a new double-axis arc-shaped large-size involute artifact was constructed, and a design method for the artifact was proposed. In the newly designed large-size involute artifact, the diameter of the reference block was 181.7744 mm, and the distance from the center of the reference block to the axis of the centering axis was 362.1212 mm. The artifact was tested using the Klingelnberg Gear Measuring Center P100. Three performance indicators f(VB), f(FK) and f(NC) are proposed to evaluate the gear measurement instrument. The experimental results demonstrated that the developed double-axis arc-shaped large-size involute artifact satisfied the high-precision requirements for the processing and inspection of artifacts. The paper provides theoretical support for establishing the value transfer and traceability system and the gear involute extension standard.
Keyword :
Value transfer Value transfer Gear measuring instrument Gear measuring instrument Large gear Large gear Gear measurement Gear measurement Involute artifact Involute artifact
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GB/T 7714 | Chen, Hongfang , Liang, Chaowei , Shi, Zhaoyao et al. New design method for large involute artifacts [J]. | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2022 , 76 : 190-198 . |
MLA | Chen, Hongfang et al. "New design method for large involute artifacts" . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY 76 (2022) : 190-198 . |
APA | Chen, Hongfang , Liang, Chaowei , Shi, Zhaoyao , Xu, Hao , Wei, Tianshui , Lin, Hu et al. New design method for large involute artifacts . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2022 , 76 , 190-198 . |
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Abstract :
The machining accuracy of a copper electrode gear (CEG), especially the pitch deviation of CEG, is affected by the wear of the ball end mill (BEM) with the increase of the length of milling path. Based on the error mapping principle, this work focuses on the influence of BEM wear on pitch deviation. In order to dynamically compensate the influence of the BEM wear on pitch deviation, a novel milling pitch deviation compensation model was proposed based on the formation mechanism and measurement principle of pitch deviation. To ensure the uniform wear at the milling edge of the BEM during the milling process, BEM wear was firstly copied to the pitch deviation according to the tooth-by-tooth milling strategy. Then, the BEM wear curve was fitted based on orthogonal experiments and multiple linear regression. According to the wear curve, an offline compensation method was adopted to compensate for the pitch deviation caused by BEM wear. In addition, the reverse compensation principle was used to compensate for the normal deviation of BEM milling path. Finally, the compensation model was verified by milling experiments. Pitch deviation met the requirements of Levels 4 similar to 5 in GB/T 38192-2019. The model can be used to guide the milling process of CEG.
Keyword :
Offline compensation Offline compensation Pitch deviation Pitch deviation Ball end mill wear Ball end mill wear Compensation model Compensation model Multiple linear regression Multiple linear regression
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GB/T 7714 | Feng, Zhipeng , Shi, Zhaoyao , Tong, Aijun et al. A pitch deviation compensation technology for precision manufacturing of small modulus copper electrode gears [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 118 (5-6) : 1511-1527 . |
MLA | Feng, Zhipeng et al. "A pitch deviation compensation technology for precision manufacturing of small modulus copper electrode gears" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 118 . 5-6 (2022) : 1511-1527 . |
APA | Feng, Zhipeng , Shi, Zhaoyao , Tong, Aijun , Lin, Shoujin , Wang, Peng . A pitch deviation compensation technology for precision manufacturing of small modulus copper electrode gears . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 118 (5-6) , 1511-1527 . |
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Abstract :
Fast acquisition of the integral tooth surface data is significant in the quality evaluation of gears. The line laser measurement provides an efficient solution to acquire the above data, but its measurement accuracy remains to be improved. A too large incident angle of measuring light seriously affects the integrity of the obtained tooth surface data, thus limiting the extraction of effective tooth surface and the quality evaluation of tooth surface. In order to clarify the influences of incident angle of measuring light on the acquired tooth surface data in the gear measurement, taking a cylindrical gear as an example, a mathematical model of incident angle is established. It is verified by simulation analysis and five groups of measuring experiments. Based on the simulation results and experimental data, the influences of offset and inclination angle of the laser sensor on the incident angle of measuring light are further analyzed. The incident angle decreases significantly with the increase in the offset. The influence of the inclination angle smaller than 60. on the incident angle is insignificant and could be ignored. In addition, according to the types of gears, the reasonable position and attitude of the sensor are determined to reduce the influence of the incident angle of measuring light on measurement accuracy.
Keyword :
Gear measuring instrument Gear measuring instrument Gear measurement Gear measurement Gear Gear Line laser sensor Line laser sensor
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GB/T 7714 | Sun, Yanqiang , Shi, Zhaoyao , Yu, Bo et al. Incident angle model of measuring light in gear measurement utilizing a line laser sensor and analysis on its influence factors [J]. | MEASUREMENT , 2022 , 203 . |
MLA | Sun, Yanqiang et al. "Incident angle model of measuring light in gear measurement utilizing a line laser sensor and analysis on its influence factors" . | MEASUREMENT 203 (2022) . |
APA | Sun, Yanqiang , Shi, Zhaoyao , Yu, Bo , Li, Haobin . Incident angle model of measuring light in gear measurement utilizing a line laser sensor and analysis on its influence factors . | MEASUREMENT , 2022 , 203 . |
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