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4th International Conference on Frontiers of Manufacturing science and Measuring technology, ICFMM 2014

作者： Yang, Cheng Gang Zhang, Chun Hui Zhao, Jing Yi Zhao, Shi Ming Tangshan Industrial Vocational and Technical College Tangshan 063000 China Hebei Province Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9783038351924

Based on the introduction of the hydraulic diagnostic techniques which are commonly used and existed defects in these methods, the active hydraulic diagnosis technology is put forward. Besides, theory analysis of active online test is elaborated. The theory of active diagnose is used in the hydraulic system of heavy transporter to describe online diagnosis method. The results show that the active hydraulic diagnosis is appropriate for all kinds of hydraulic system which is a general diagnosis method. © (2014) Trans Tech Publications, Switzerland.

关键词： Hydraulic equipment

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Effects of structural parameters on hydraulic performance of flow regulator

Effects of structural parameters on hydraulic performance of...

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CSAA/IET International Conference on Aircraft Utility Systems, AUS 2018

作者： Li, Yong Zong, Xuemei Yuan, Xiaoming Zhao, Shiyi State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery Jiangsu Xuzhou Construction Machinery Research Institute Xuzhou Construction Machinery Group Co. Ltd. Xuzhou China Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao Hebei China

ISBN: (纸本)9781785617911

In order to evaluate the hydraulic performance of a regulator, the pressure loss and the stabilization performance of the regulator installed in the fire water monitor were introduced. The effects of structures on a regulator were investigated by the structural model made in UG and the flow simulation conducted in ANSYS. The hydraulic performance of a star-shaped regulator was analyzed with different structure parameters, such as the blade number, axial length and rounded-corner. The effects of structure parameters on the regulator were revealed, based on which the hydraulic performance of the improved regulator with different blade numbers was analyzed. The results show that the improved regulator with two cross-sections in dislocation and six even-distributed blades has the better hydraulic performance. The preliminary experimental results show that the improved regulator can improve the jet range of a fire water monitor. © 2018 IET Conference Publications. All rights reserved.

关键词： Flow simulation

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Reliability prediction method of hydraulic system by fuzzy theory

Reliability prediction method of hydraulic system by fuzzy t...

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6th IFAC Symposium on Mechatronic Systems, MECH 2013

作者： Chen, Dongning Yao, Chengyu Feng, Zhongkui Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao China Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9783902823311

The hydraulic system's reliability is a key factor to ensure the reliable operation of equipment and it is very important to evaluate reliability of hydraulic system. The paper describes a reliability prediction method that may be used to evaluate the reliability of hydraulic systems for industrial applications. The proposed method takes advantage of fuzzy set theory. The aim of this method is to minimize the deficiencies of the traditional reliability prediction methods treating a failure rate as fixed value due to insufficiency practice data. Triangular fuzzy number and Gaussian fuzzy number are used in the application of this prediction method, where environmental factor, derating factor, and other factors are considered. Finally, an example of type crane's hydraulic system is given to verify the feasibility and practicability of the method. © 2013 IFAC.

关键词： Fuzzy set theory

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Reliability optimization of multi-state hydraulic system based on T-S fault tree and extended PSO algorithm

Reliability optimization of multi-state hydraulic system bas...

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6th IFAC Symposium on Mechatronic Systems, MECH 2013

作者： Yao, Chengyu Wang, Bin Chen, Dongning Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao China

ISBN: (纸本)9783902823311

In order to overcome the difficulty of constructing the multi-state system's reliability optimization model, and the shortage of premature convergence of PSO (Particle Swarm Optimization) algorithm, a new reliability optimization method based on T-S fault tree and EPSO (Extended PSO) algorithm is proposed. According to the T-S fault tree and T-S rules of the events, the multi-state system reliability optimization model is constructed, at the same time, given constraint conditions on the system cost, weight and volume, and combined with the death penalty to construct the fitness function. Furthermore, EPSO algorithm based on the attraction and repulsion forces in the artificial physics is applied to the reliability optimization of multi-state hydraulic system. Comparing with PSO algorithm, the results of EPSO algorithm are in a better performance in obtaining global optimal solution. © 2013 IFAC.

关键词： Trees (mathematics)

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Model-based Synchronous Control of Redundantly Actuated Parallel Manipulator with Neural Network

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Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 2018年第2期49卷 367-375页

作者： Liu, Xiaofei Yao, Jiantao Zhao, Yongsheng Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Yanshan University Qinhuangdao066004 China Key Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University Qinhuangdao066004 China

Redundantly actuated parallel manipulator demands higher actuation coordination than the non-redundantly actuated one, thanks to its degree of actuation exceeding its degree of freedom. To improve the actuation coordination of redundantly actuated parallel manipulator, a novel model-based driving force synchronous control method with neural network was proposed. With 6PUS+UPU parallel manipulator as object, dynamic model was derived based on virtual work principle. To improve the actuation coordination of redundantly actuated parallel manipulator, a novel driving force synchronous control method was proposed on basis of force-position hybrid actuation. The synchronous control method was based on the driving force error of actuated joints and driving force adjustment was calculated by the synchronous controller. The synchronous controller was designed with neural network. What's more, the learning law of neural network controller was derived with manipulator's dynamic model to improve the learning efficiency. Model simulation and prototype experiment were carried out, and a performance comparison analysis with traditional force-position hybrid actuation method was made to verify the proposed control method. Comparison analysis revealed that, comparing with the traditional force-position hybrid actuation method, driving force synchronous control with neural network proposed could effectively improve the actuation coordination of redundantly actuated parallel manipulator. The results revealed that the synchronous control method reduced the driving force errors of whole manipulator by properly magnifying the control error of force actuated joint. © 2018, Chinese Society of Agricultural Machinery. All right reserved.

关键词： Dynamic models

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Evolution analysis of key mechanical properties during the forming process of JCOE and JCOC pipes and its influence on collapse failure

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Ocean Engineering 2025年 335卷

作者： Shaocong Qi Guoyi Shen Xihai Liu Wanlin Cheng Ruixue Zhai Qingdang Meng Jun Zhao Gaochao Yu Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao 066004 China School of Mechanical Engineering Yanshan University Qinhuangdao 066004 China Hebei Huayang Steel Pipe Co. Ltd Cangzhou 061403 China Hebei Yadu Pipeline Equipment Co. Ltd Cangzhou 061300 China Department of Mechanical Engineering Imperial College London London SW7 2AZ UK

The LSAW pipes are main trunk pipes for offshore oil and gas energy development. Enhancing the buckling resistance performance of submarine pipes and accurately evaluating its collapse pressure are research priorities. This study analyzes for the first time the evolution of residual stress and compressive strength during the full-process forming of JCOE and JCOC pipes, and reveals the influence mechanism of mechanical properties on collapse. The yield plateau phenomenon and variable elastic modulus behavior of X65 steel were described by modifying Chaboche model. A theoretical model for the evolution of mechanical properties during JCO forming, expansion, and compression processes were established. The full-process forming and collapse simulations were conducted. The experimental and theoretical yield stresses have good consistency. The calibration ratio and t / D ratio are key factors affecting the yield stress and residual stress. Compared with JCOE pipes, JCOC pipes have lower residual stress but higher compressive strength. Within calibration ratio range of ±0.4 % to ±1.0 %, residual stress is the main factor affecting collapse. As the calibration ratio increases, residual stress improves and compressive yield stress becomes a key factor. This study is of great significance for the forming and buckling analysis of pipelines.

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Multi-Scale GHG Emission Relations in Resource-Based Heavy Industrial Cities: A Case Study of Tangshan City, Hebei Province

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Chinese Journal of Urban and Environmental Studies 2021年第4期9卷 74-98页

作者： HAN Mengyao JIANG Chuan LIU Siyuan Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of Sciences School of Mechanical Engineering Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science (Ministry of Education of China)Yanshan University

The greenhouse gas(GHG) emission pressure faced by resource-based heavy industrial cities was mainly induced by multi-scale interactions, which require systematical assessments from local,regional, national and global scales. Taking Tangshan city, a heavy industry base in Hebei Province of China, as the research area, this study carried out a multi-scale analysis on the GHG emissions in terms of final demand, final consumption and trade balance. The main results are as follows:(1) The average embodied intensity of GHG emissions in Tangshan was 27.6 tons/10,000 CNY, of which 66.2% was caused by local inputs;(2) The secondary industry was the main source for the relatively high GHG emissions in Tangshan;(3) The GHG emissions embodied in final demand were 201.6 million tons, within which the proportion of fixed capital formation reached 59.4%;(4) As for the trade balance, Tangshan was a net exporter of embodied GHG emissions, with the total net outflows of 411.6 million tons. Depicting the GHG emission flows and sorting out the multiple GHG emission inventory would be helpful to identify the transformation pressure of resource-based heavy industry cities, which would be significant for the adjustments in industrial structures and policy optimization of energy saving and emissions reduction.

关键词： Resource-based heavy industry city embodied greenhouse gas emissions multi-scale input–output analysis

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Research on the Process-based Generation Method of Multi-ships Collision Avoidance Test Scenarios Database for Maritime Autonomous Surface Ships 33rd

Research on the Process-based Generation Method of Multi-shi...

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33rd International Ocean and Polar Engineering Conference, ISOPE 2023

作者： Wang, Xinyu Wang, Yihang Bian, Hui Ma, Jilin Zhao, Xuan Qinhuangdao Branch China Classification Society Hebei China School of Mechanical Engineering Yanshan University Hebei China Parallel Robot and Mechatronic System Laboratory Hebei Province Hebei China Key Laboratory of Advanced Forging & Stamping Technology and Science Hebei China Science & Technology Innovation and Test Center Beijing China

ISBN: (纸本)9781880653807

This paper proposes a process-based method for generating virtual test scenarios for near-shore maritime autonomous surface ships (MASS) collision avoidance tests. The method includes a scenario complexity index to provide different difficulty levels of virtual test scenarios for different test requirements, reducing the test volume while ensuring coverage and reliability requirements. The scenario database generated by this method reflects the frequency of real-world scenarios and meets the requirements of virtual test realism. This method can improve the efficiency and reliability of MASS testing, with potential future improvements in the complexity evaluation matrix and statistical analysis of vessel maneuvering ability. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Ships

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Study on relationship of intellectualization between hydraulic mobile machinery and hydraulic components 7

Study on relationship of intellectualization between hydraul...

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7th International Conference on Advances in Construction Machinery and Vehicle Engineering, ICACMVE 2019

作者： Xu, Yangzeng Liu, Siyuan Shanghai Hydraulics Pneumatics and Seal Industry Association Shanghai200000 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Hebei.Qinhuangdao066004 China MOE Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University China

ISBN: (纸本)9781728139050

This paper analyses the current situation of insufficient intellectualization of hydraulic system and component in the process of intellectualization of Engineering robots, and puts forward the way to develop hydraulic intelligent components. At the present the hydraulic intelligent components are still in the initiation period, the main requirements and means of product development are put forward in this paper. Emphasis is laid on the feasibility of implicit state space method as the core theory of hydraulic intelligent components, and a control algorithm of hydraulic components based on implicit state equation is proposed, which can realize the function of autonomous control. A parameter identification method based on the inverse operation of the above control algorithm is proposed, which can be used to construct a model-based intelligent fault diagnosis system for grey box identification, and for future use in the hydraulic technology. Fault diagnosis of hydraulic system and components are prospected. Hydraulic intelligent components are to be an agent. It continues to develop in application in intelligent construction machinery, and will inevitably open up a new practical application market in the development of digital twin technology. © 2019 IEEE.

关键词： State space methods

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Driving force synchronous control of redundantly actuated parallel manipulator

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Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS 2018年第9期24卷 2140-2149页

To improve the actuation coordination of redundantly actuated parallel manipulator, a novel model-based driving force synchronous control method was proposed. With 6PUS+UPU parallel manipulator as the research object, the dynamics model was deduced based on virtual work principle, and the coordination mechanism of driving force under scheduled motion was analyzed. On the basis of force-position hybrid actuation, a driving force synchronous control method was proposed, and the control algorithm was designed with coordination mechanism. Simulation and prototype experiment were used to verify the proposed control method. © 2018, Editorial Department of CIMS. All right reserved.

关键词： Manipulators

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