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HYBRID CONTROL OF HYDRAULIC PRESS MACHINE BASED ON ROBUST CONTROL 被引量:2
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作者 FANG Yu YANG Jian CHAI Xiaodong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第2期72-76,共5页
A robust control algorithm is proposed to focus on the non-linearity and variables of the hydraulic press machine with the proportional vatve. The proposed robust controller does not need to design stable compensator ... A robust control algorithm is proposed to focus on the non-linearity and variables of the hydraulic press machine with the proportional vatve. The proposed robust controller does not need to design stable compensator in advance, which is simple in design and has large scope of uncertainty applications. The feedback gains of the proposed robust controller are small, so it is easily implemented in engineering applications. The theoretical and experimental research on the position and speed control of the hydraulic press machine is carried out. The control requirements of the hydraulic press machine during the working process are met in the position and speed at the same time. Experimental results show that the proposed controller has better robustness subject to load variables and adaptability of parameter variations of the hydraulic press machine with the proportional valve. 展开更多
关键词 Robust control Hydraulic press machine Position and speed control
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Press Conference on CAS Standard-Household Electric Double-driver Washing Machine Held in Beijing
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《China Standardization》 2005年第3期1-4,共2页
On April 26th, 2005, the 5th World Intellectual Property Day, the China Association for Standardization (CAS) held the press conference on CAS standard--Household Electric Double-driver Washing Machine in Diao Yu Tai ... On April 26th, 2005, the 5th World Intellectual Property Day, the China Association for Standardization (CAS) held the press conference on CAS standard--Household Electric Double-driver Washing Machine in Diao Yu Tai State Guest House in Beijing. The topic of the press conference was to Promote Technical Innovation, to Protect Intellectual Property and to Develop International Standard. Mr. Ma Lincong, General Secretary of CAS hosted the press conference. 展开更多
关键词 CAS Press Conference on CAS Standard-Household Electric Double-driver Washing machine Held in Beijing
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Approximate-model Based Estimation Method for Dynamic Response of Forging Processes 被引量:2
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作者 LEI Jie LU Xinjiang +2 位作者 LI Yibo HUANG Minghui ZOU Wei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第3期565-572,共8页
Many high-quality forging productions require the large-sized hydraulic press machine(HPM) to have a desirable dynamic response. Since the forging process is complex under the low velocity, its response is difficult... Many high-quality forging productions require the large-sized hydraulic press machine(HPM) to have a desirable dynamic response. Since the forging process is complex under the low velocity, its response is difficult to estimate. And this often causes the desirable low-velocity forging condition difficult to obtain. So far little work has been found to estimate the dynamic response of the forging process under low velocity. In this paper, an approximate-model based estimation method is proposed to estimate the dynamic response of the forging process under low velocity. First, an approximate model is developed to represent the forging process of this complex HPM around the low-velocity working point. Under guaranteeing the modeling performance, the model may greatly ease the complexity of the subsequent estimation of the dynamic response because it has a good linear structure. On this basis, the dynamic response is estimated and the conditions for stability, vibration, and creep are derived according to the solution of the velocity. All these analytical results are further verified by both simulations and experiment. In the simulation verification for modeling, the original movement model and the derived approximate model always have the same dynamic responses with very small approximate error. The simulations and experiment finally demonstrate and test the effectiveness of the derived conditions for stability, vibration, and creep, and these conditions will benefit both the prediction of the dynamic response of the forging process and the design of the controller for the high-quality forging. The proposed method is an effective solution to achieve the desirable low-velocity forging condition. 展开更多
关键词 performance analysis forging process MODELING hydraulic press machine
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Fabrication and Characterization on Physico-Mechanical and Structural Properties of Sawdust Reinforced Acrylonitrile Butadiene Styrene (ABS) Composites
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作者 Budrun Neher Nabila Tasnim Nova +2 位作者 Rakib Hossain M. A. Gafur Farid Ahmed 《Materials Sciences and Applications》 2020年第9期644-658,共15页
The sawdust reinforced Acrylonitrile Butadiene Styrene (ABS) composites were prepared by using hot press molding machine for five different wt% (0%, 5%, 10%, 15% and 20%) at 180<span style="white-space:nowrap;... The sawdust reinforced Acrylonitrile Butadiene Styrene (ABS) composites were prepared by using hot press molding machine for five different wt% (0%, 5%, 10%, 15% and 20%) at 180<span style="white-space:nowrap;">&deg;</span>C temperature and 50 KN load. Sawdust was collected from local saw mill of Savar, Dhaka, Bangladesh and ABS polymer was collected from local market of Dhaka, Bangladesh. In this study, different properties of composites like physical (bulk density and water absorption), mechanical (tensile properties and hardness) and structural (Fourier Transform Infrared Spectroscopy) properties were studied. The bulk density of composites was not altered consistently and it gave greater value for 5% and 20% composites. The water absorption enhanced for all composites with the accumulation of fiber content and soaking time. The reduction of tensile strength and Leeb’s rebound hardness of the composites were observed with the increase of the fiber content in all compositions. Maximum (%) of elongation was found for 5% composite, and then it gradually decreased;however, elastic modulus increased with the increased of fiber content in composites. Fourier Transform Infrared (FTIR) spectroscopy study was done for structural characterization. It was found that there was a new bond (C≡C) stretching formed for 20% composite;moreover, C-H rocking for 0% composite was broken for all other composites after the addition of sawdust in ABS polymer matrix. 展开更多
关键词 Sawdust-ABS Composite Hot Press Molding machine Tensile Strength Leeb’s Rebound Hardness FTIR Spectroscopy
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