检索结果-内蒙古大学图书馆

Research Square 2021年

作者： Wang, Taiyong Cao, Libo Zhang, Yongbin Dong, Jingchuan Jia, Songhui Tian, Chong Liu, Qingjian Renai College Tianjin University Tianjin301636 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China School of Mechanical Engineering Tianjin University No.135 YaGuan Road Jinnan District Tianjin300354 China

In the field of CNC machining, high-speed and high-precision machining has been regarded as the key research by many scholars. In conventional methods, high-speed machining and high-precision machining are contradictory. It is inevitable to reduce the feedrate to improve the processing accuracy. In the paper, a pre-compensation based on discrete inverse transfer function (PDIT) theory is proposed. PDIT is able to improve machining accuracy by reducing contour errors without decreasing feedrate. The proposed PDIT theory is divided into three parts, NURBS interpolator, feedrate scheduling, and interpolator with pre-compensation. The NURBS interpolator has greatly advantage to interpolate the parameter curve directly. Therefore, the paper adopts the NURBS interpolator to accomplish interpolation. In the feedrate scheduling, S-type flexible acceleration and deceleration are used for path planning, and the maximum starting feedrate is obtained with the feedrate constraint. In the interpolator with pre-compensation, the NURBS interpolator is pre-compensated by PDIT. For inputs, the response of transfer function reach steady-state response with a little time. Before reaching steady-state response, the unsteady response exists in the transfer function. The unsteady response usually sustains tens of interpolation periods and must be lead contour error in machining. Hence, the PDIT theory is employed to compensate the contour error causing by the unsteady response of transfer function to NURBS interpolator. The drive system is a transfer function, so the unsteady response of drive system cause machining errors before reaching the steady-state response. In the paper, the NURBS interpolator is pre-compensated by PDIT theory before the drive system to reduce contour errors and improve machining accuracy. Finally, the performance of the proposed PDIT is evaluated by simulation experiments. The experimental results illustrate that PDIT theory obviously improve the machining accura

关键词： Transfer functions

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design of deep-water omnidirectional spirit level

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Journal of Measurement Science and Instrumentation 2021年第4期12卷 472-478页

作者： ZHAO Lianyu LI Shuo ZHAO Xiaolei LI Maolin CHEN Jinyu WANG Chenglin Tianjin Key Laboratory of Advanced Mechatronic System Design and Intelligent Control National Demonstration Center of Experimental Mechanical and Electrical Engineering EducationSchool of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China Offshore Oil Engineering Co. Ltd.Tianjin 300461China

Attitude adjustment is a key link in the installation process of underwater facilities in deep *** solve this problem,an omnidirectional spirit level for deep water was *** sealing principle of the spirit level and the principle of deep-water pressure resistance are analyzed,and the threaded connection strength is *** mechanical simulation verifies that the spirit level can withstand the pressure of 2000 m water depth,and the water pressure test is carried out for 30 min in a 20 MPa hyperbaric *** the experiment is completed,the appearance of the spirit level is intact and there is no *** experiment results show that the deep-water omnidirectional spirit level can be used in the deep sea within 2000 m.

关键词： deep water omnidirectional spirit level attitude adjustment pressure test underwater pressure

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A novel lightweight optimization design of gear shaper

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UPB Scientific Bulletin, Series D: mechanical Engineering 2019年第4期81卷 241-252页

作者： Zheng, Qing-Chun Lu, Kai-Jie Zhu, Pei-Hao Ma, Wen-Peng Liu, Jing Na Hu, Ya-Hui Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China

The machine produces vibrations under the excitation of the cutting load and the non-equilibrium inertia of the actuator and actuator, which affects the machining accuracy and reduces the processing efficiency. A dynamic design method of machine tool structure is put forward and studied to ensure the dynamic properties of machine tool structure and realize the machining precision which improved machine tool weight is reduced by 18.3%, the machine natural frequency is increased by 2.1%, which improves the machine Performance, and access to the final design. © 2019, Politechnica University of Bucharest. All rights reserved.

关键词： Actuators

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Weld image dust removal algorithm based on fusion of bright channel and weighted guide dark channel

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical Engineering and Computer Science 2020年第4期82卷 69-80页

作者： Zheng, Qingchun Lu, Kaijie Ma, Wenpeng Zhang, Zhidong Zhu, Peihao Liu, Jingna Hu, Yahui Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China Tianjin300384 China

The dust removal technology of weld image is helpful to promote the development of weld target detection and tracking control. Aiming at the problem that the image restoration algorithm has halo phenomenon in depth discontinuity and easy to cause color distortion, this paper proposes a single image restoration algorithm based on fusion of bright channel and weighted guided dark channel for dedusting of weld image. Firstly, the bright channel hypothesis is derived according to dark channel priori (DCP), and the bright channel obtained by the adaptive method will fuse with the dark channel image to construct the fusion channel. Then, the weighted guided filter is used to optimize the rough transmittance. Finally, the restored image of the weld is recovered according to the atmospheric scattering model and the restored atmospheric light. Simulation experiments and image quality analysis show that the proposed algorithm can recover the details of the weld image and suppress the halo phenomenon. The image segmentation networks are used to further verify that our algorithm can improve the accuracy and integrity of weld segmentation. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： Image segmentation

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Compliance control and Simulation of a Next-Generation Chewing Robot

Compliance Control and Simulation of a Next-Generation Chewi...

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Chinese control Conference (CCC)

作者： Xudong Wang Weiliang Xu Jaspreet Dhupia John Bronlund Jianda Han Department of Mechanical & Mechatronics Engineering the University of Auckland Auckland New Zealand Reddit Institute Palmerston North New Zealand School of Food and Advanced Technology Massey University Palmerston North New Zealand Institute of Robotics and Automatic Information System College of Artificial Intelligence Nankai University Tianjin China Tianjin Key Laboratory of Intelligent Robotics Nankai University Tianjin China

The aim of the development of the chewing robots is to study the biomechanics of chewing process or produce the bolus for further research by in vitro experiments. Some chewing robots are open loop controlled and couldn't behave like a human. However, to make the chewing robots more bin-mimic, force feedback based closed loop control is required. To improve the efficiency of the in-vitro chewing experiments, a next generation chewing robot with cam-follower based multi-chambers was developed previously, which can be used test the effect of different chewing parameters on the chewing performance and food texture changes simultanously. In this paper, modified admittance control based on the force feedback was applied to the chewing robot. At first, to improve food particle size reduction to a distribution which closely matches that produced by human and protect the components of the robot from breakage or impact damage, a spring mass based system, called remote center compliance (RCC), was developed and applied to the robot to control the chewing force. Then, based on the knowledge of human chewing process, power-based algorithm, and modified admittance control method were used as the feedback to adjust the angular velocity of the motor and corresponding chewing velocity of the teeth. The performance of the control model was also simulated, results showed that the model is reliable to control the robot and make it bio-mimic.

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design of an Active Battery Equalization Circuit with DC-DC Converter

Design of an Active Battery Equalization Circuit with DC-DC ...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Kun Li Xiao Zong Qing Liu Yanfang Sun Fengjun Xue Tianjin Key Laboratory of Film Electronic and Communication Device Tianjin University of Technology Tianjin PR China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin PR China Wuhan Running Education Research Institute Wuhan PR China

ISBN: (纸本)9781665425513;9781665430791

An active balanced topology circuit based on DC-DC converter is proposed in this paper. It uses the energy of the whole battery pack to charge the lowest voltage cell. In the control strategy, starting and stopping the equalization is well controlled by setting the appropriate thresholds of voltage difference between each cell. Experiment board which can sample and equalize 16 batteries is manufactured, and the experimental results verify the effectiveness of the proposed equalization system.

关键词： Electrical engineering Energy exchange Asia DC-DC power converters Threshold voltage Batteries Topology

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Study on the Band Gap and Directional Wave Propagation Mechanism of Novel Single-Phase Metamaterials

SSRN

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SSRN 2022年

作者： Cheng, Shu-Liang Yang, Hong-Yun Yan, Qun Wang, Bin Sun, Yong-Tao Xin, Ya-Jun Ding, Qian Yan, Hao Wang, Liang Key Laboratory of Mechanical Reliability for Heavy Equipment and Large Structure of Hebei Province Yanshan University Qinhuangdao China Tianjin Key Laboratory of Soft Soils and Engineering Environment Tianjin Chengjian University Tianjin China Department of Mechanics Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin University Tianjin China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China Key Laboratory of Aeroacoustics and Dynamics Aircraft Strength Research Institute Xi’an China Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province Yanshan University Qinhuangdao China

In this paper, a new type of single-phase metamaterial is proposed. Based on the finite element method, the band gap characteristics of the structures with different branches are comprehensively analyzed, and the existence of the band gap is further verified by the frequency response transmission spectrum. Then, the propagation characteristics of elastic waves of different frequencies in different combinations of structures are investigated respectively. The results show that the proposed single-phase metamaterial structure has an excellent band gap range, and under the action of relatively low-frequency elastic waves, the wave propagation in the structure has a certain direction and regionality, while the elastic waves at higher frequencies are applied, the propagation direction of the wave tends to propagate in all directions. This paper provides a new idea for studying the structural design of metamaterials with specific wave propagation directions. © 2022, The Authors. All rights reserved.

关键词： Energy gap

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Reform and Practice in Experimental Teaching from the View of "Emerging Engineering": Case Study on the Field of Energy and Power Engineering

Reform and Practice in Experimental Teaching from the View o...

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Information Communication Technologies Conference (ICTC)

作者： He Tian Lijian Liu Miao Tian Shimin Zhou Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) School of Mechanical Engineering Tianjin University of Technology Tianjin China Tianjin Academy of Educational Science Tianjin China Tianjin Newborn New Energy Technology Co. Ltd Tianjin China

According to the idea of "Emerging Engineering Education" talent training model of Ministry of Education, students should be trained to have "metaphysical" concept, connection, imagination, macro thinking. Project-driven experiment teaching focuses on a project, and the goal is the completion of the project; the student is the center of teaching activities, which is supported by the inquiry process. This study analyzes the significance of the project-driven method in experimental teaching. This paper describes the implementation process of experimental teaching in the field of energy and power engineering in terms of project design, teaching system construction and so on under the project-driven method. By analyzing the results of a questionnaire survey distributed to students of energy and power in the College of mechanical Engineering at the tianjin University of Technology, it is found that the students are satisfied with the effects of project-driven experimental teaching, and the use of experimental teaching has greatly aroused the students' enthusiasm for learning. The ability of the students to engage in autonomous learning, engineering practice and innovation has been greatly improved, and a good teaching effect has been achieved.

关键词： Training Power engineering Technological innovation Education Solids Communications technology mechanical engineering

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Model Predictive control Assisted Energy Management Strategy for Hybrid Mining Dump Trucks Based on Speed and Slope Prediction

SSRN

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SSRN 2024年

作者： Xie, Guojin Qin, Hongmao Xie, Heping Bian, Yougang Ding, Rongjun State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Hunan Changsha410082 China School of Mechanical and Automotive Engineering Guangxi University of Science and Technology Guangxi Liuzhou545616 China Wuxi Intelligent Control Research Institute of Hunan University Wuxi214115 China Xuzhou XCMG Mining Machinery Co. Ltd. Xuzhou210009 China

Based on the basic principles of model predictive control, the energy management and optimal control problems of large-scale mining hybrid dump trucks are studied. This paper presents an artificial neural network model to predict the vehicle speed and road slope in the predictive horizon. Based on the predicted information and the vehicle dynamics model, the future power demand of the vehicle is calculated, and a fuel economy optimization objective function is established to minimize the set objective function value under the condition of multiple system constraints, which is solved through dynamic programming algorithm (DP) rolling optimization in the finite predictive horizon to realize optimal energy allocation between the engine generator and battery pack. The vehicle speed and road slope are predicted in 5 different horizons to determine the optimal prediction horizon under the conditions of flat and slope roads. A prediction model is constructed, and combined with the vehicle system and dynamic model, a DP-MPC energy management strategy for series hybrid electric vehicle (SHEV) is designed, and the advantages and disadvantages of the strategy are evaluated through offline simulation testing. Finally, the effectiveness and real-time performance of the energy management strategy are verified through HIL experiments under different operating conditions. © 2024, The Authors. All rights reserved.

关键词： Model predictive control

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Model Predictive control Assisted Energy Management Strategy for Hybrid Mining Dump Trucks Based on Speed and Slope Prediction

SSRN

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SSRN 2024年

关键词： Model predictive control

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