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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Elasto-Plastic Analysis for Static and Dynamic Performance of Rolling Element Bearings BI Rengui, QIAN Ping, YAN Can, YANG Daiyun Journal of Jishou University（Natural Sciences Edition)    DOI: 10.13438/j.cnki.jdzk.2019.05.007 Select Parameter Optimization of High Speed Cutting Technologe for Super-Strength Steel WU Shunxing,BI Rengui,LIU Zhiyong Journal of Jishou University（Natural Sciences Edition)    DOI: 10.13438/j.cnki.jdzk.2019.03.009 Select Minimum Motion Planning and Control of Acceleration-Velocity Level for Multi-Link Robot Arms XIAO Lin, YAN Hui-Ling, ZHOU Wen-Hui, LIAO Bai-Lin journal6    2015, 36 (6): 44-48.   DOI: 10.3969/j.cnki.jdxb.2015.06.011 Abstract （1807）      PDF（pc） （450KB）（1417）       Knowledge map    Save To realize the minimum motion planning and control of multi-link robot arms at the acceleration-velocity level,a norm-based minimum acceleration movement control scheme is proposed and investigated.Different from other schemes,the proposed scheme involves the joint-angle,joint-velocity,and joint-acceleration constraints via using quadratic program formulation.Thus,the redundant robot arms can avoid the physical constraints during motion control process.In addition,in order to control the movement of robot arms effectively,an iterative control algorithm with less computation complexity is developed.Finally,a planar six-link manipulator is employed as an experimental platform to track an ∞-type path task.Simulative results verify the effectiveness of the minimum acceleration scheme and the corresponding iterative control algorithm. Reference | Related Articles | Metrics | Comments（0） Select New Method of Tobacco Redrying Machine Humidification WANG Zhao-Tie journal6    2015, 36 (6): 49-52.   DOI: 10.3969/j.cnki.jdxb.2015.06.012 Abstract （1815）      PDF（pc） （2062KB）（1610）       Knowledge map    Save The traditional methods of KG-type tobacco redrying machine humidification are not very effective,nozzle gets easily blocked,and the temperature of moisture regaining parts exceeds standards,resulting steam and water waste.The new steam-water atomizing nozzle with adjusting cap can realize re-atomization,thus increasing the moisture regaining effect by over 4%.With this method,the temperature of moisture regaining parts can be controlled within 70 ℃,and the steam can be saved by over 30%. Reference | Related Articles | Metrics | Comments（0） Select Rheological Property and Pre-Stressed AnchorageTechnology of High Stress Soft Rock BAI Qi-Shu, LIU Xin-Xi, CHEN Xiang-Yang, MAO Guang-Xiang journal6    2014, 35 (3): 59-63.   DOI: 10.3969/j.issn.1007-2985.2014.03.013 Abstract （2215）      PDF（pc） （711KB）（1520）       Knowledge map    Save With increasing depth of coal mining,roadway support problems in high-stress soft rock have become increasingly prominent.The supporting of soft rock roadway stability has become a major bottleneck for coal mine production safety.According to the curve  law and time-dependent properties,obtained by the soft rock graduation loading triaxial compression creep test,Burgers viscoelasticity rheologic model of argillaceous siltstone at high-stress situation was established.On the basis of viscoelastic plasticity mechanics theory,the one-dimensional creep constitutive equation of this model was derived,and then the model parameters were identified with the help of non-line regression.The imparts of  the pre-tension of bolts and cables on the creep of the high stress soft rock roadway was analyzed by FLAC3D.The results showed  that the creep of the high stress soft rock roadway  reduced when the pre-tension of bolts and cables increased,and the pre-tension of bolts and cables must exceed 100 kN and 900 kN. Reference | Related Articles | Metrics | Comments（0） Select Slider-Crank Mechanism Optimal Design and Dynamic Analysis LI Cun-Peng journal6    2014, 35 (3): 64-68.   DOI: 10.3969/j.issn.1007-2985.2014.03.014 Abstract （2386）      PDF（pc） （780KB）（2239）       Knowledge map    Save Based on the slider-crank mechanism between the connecting rod was used and crank pin,additional eccentric connecting rod was used on institutional improvement,which made the eccentric wheel drive the crank movement while driving planetary gear transmission to the external driving force.Through the analysis of the dynamic characteristics of institutions before and after improvement,the improved slider-crank mechanism has a bigger output torque than the traditional slider-crank mechanism. Reference | Related Articles | Metrics | Comments（0） Select Robust Design for Handwheel Shoe Brake Linkage of Electric Mine Locomotive WEN Ze-Jun, WANG Zhao-Bo, YUE Wen-Hui, YANG Shu-Yi, LIU Ai-Jun journal6    2013, 34 (3): 49-54.   DOI: 10.3969/j.issn.1007-2985.2013.03.011 Abstract （3453）      PDF（pc） （526KB）（1514）       Knowledge map    Save A robust parameter design and optimization of handwheel shoe brake linkage for electric mine locomotive are studied,with genetic algorithm (GA) and Monte Carlo simulation used.Firstly,the kinematic model of linkage is established while the braking process of handwheel shoe brake linkage is analyzed.Secondly,the kinematical model of handwheel shoe brake linkage for electric mine locomotive is established based on the revolving pair clearance model.Finally,with the objective to satisfy the lowest mean error and standard deviation of shoe brake distance,taking the linkage length for the design variables and the revolving pair clearance and contact angle and machining error for noise factors,the model of robust parameter design and optimization for handwheel shoe brake linkage of mine electric locomotive is established,and the parameters are optimized.The result shows that the absolute error of shoe brake distance reduced by 15.4%,and the standard deviation of shoe brake distance reduced by 28.6%.The uncertainty of shoe brake process can be significantly reduced without raising the manufacturing precision of linkage.It has important significance in the design quality of handwheel shoe brake linkage. Reference | Related Articles | Metrics | Comments（0） Select Predition of the Net Length of Paper Machine Drying Net DING Qi-Min journal6    2013, 34 (2): 84-86.   DOI: 10.3969/j.issn.1007-2985.2013.02.018 Abstract （2085）      PDF（pc） （385KB）（1756）       Knowledge map    Save According to the field study of paper machines,the working principle of paper machine and the operation of the product “drying net” by Aoboni Co. are explored.The mathematic model of the functional relationship between the net length and the adjusting roller of paper machine is established.This model can be used to direct the production,hence improving the producing efficiency and the working environment. Related Articles | Metrics | Comments（0） Select Simply-Supported Beam Bridge’s Dynamic Response to the Different Vehicle Speed and Loaded TAN Hong-Xia, LI Jian-Nan, LI Lue, WANG Jing-Jing journal6    2013, 34 (2): 87-90.   DOI: 10.3969/j.issn.1007-2985.2013.02.019 Abstract （2479）      PDF（pc） （400KB）（1753）       Knowledge map    Save Using modal decomposition method for solving vehicle-bridge coupling equation to analyze the dynamic response of the simply-supported beam bridge to different vehicle load and speed.The half car model was used  as vehicle,and  Euler-Bernoulli beam was used as the simply-supported beam bridge.Using the ANSYS software,the simply-supported beam bridge span deflection curve was obtained.The results show that vehicle load increase  made the bridge span deflection increase;the beam’s span deflections were 0.028 m and 0.049 m respectively  in the  standard vehicle load and 100% vehicle overload.As the vehicle speed increased,the simply-supported beam bridge span deflection reached at its peak value at the vehicle speed of 60 km/h and vehicle-bridge resonance was resulted in. Reference | Related Articles | Metrics | Comments（0） Select Application of Flexible Conductive Coating in Monitoring Technology of Urban Tunnel Cracks WANG Chao, ZHAO Qi-Lin, DENG An-Zhong journal6    2013, 34 (2): 91-96.   DOI: 10.3969/j.issn.1007-2985.2013.02.020 Abstract （2701）      PDF（pc） （2098KB）（2063）       Knowledge map    Save The conductive film of cured flexible conductive coating can be used to prepare a sensor system.If such system is attached to the surface concrete or embedded into the interior concrete and deforms with the concrete,the detected resistance change of the system can indicate the real-time cracks and its extension.According to the mechanism of the urban tunnel cracks,this paper proposes the development of low-cost and crack-sensitive conductive coating,which can achieve the early monitoring of large tunnel cracks.Pilot project shows that such kind of coating can ensure the quality,safety,efficiency,and long-term normal operation of the urban tunnel and has great application value. 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