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| 1 | Mechanical Properties and Microstructure of Portland Cement Concrete Prepared with Coral Reef Sand显示文摘The feasibility of using coral reef sand(CRS) in Portland cement concrete is investigated by testing the mechanical property and microstructure of concrete. The composition, structure and properties of the CRS are analyzed. Mechanical properties and microstructure of concrete with CRS are studied and compared to concrete with natural river sand. The relationship between the microstructure and performance of CRS concrete is established. The CRS has a porous surface with high water intake capacity, which contributes to the mechanical properties of concrete. The interfacial transition zone between the cement paste and CRS is densified compared to normal concrete with river sand. Hydration products form in the pore space of CRS and interlock with the matrix of cement paste, which increases the strength. The total porosity of concrete prepared with CRS is higher than that with natural sand. The main difference in pore size distribution is the fraction of fine pores in the range of 100 nm. | 王乾坤 LI Peng 田亚坡 CHEN Wei SU Chunyi | 2016 | Journal of Wuhan University of Technology(Materials Science)2016，31，5： | 19 |
| 2 | Semi-active Sliding Mode Control of Vehicle Suspension with Magneto-rheological Damper显示文摘The vehicle semi-active suspension with magneto-rheological damper(MRD) has been a hot topic since this decade, in which the robust control synthesis considering load variation is a challenging task. In this paper, a new semi-active controller based upon the inverse model and sliding mode control(SMC) strategies is proposed for the quarter-vehicle suspension with the magneto-rheological(MR) damper, wherein an ideal skyhook suspension is employed as the control reference model and the vehicle sprung mass is considered as an uncertain parameter. According to the asymptotical stability of SMC, the dynamic errors between the plant and reference systems are used to derive the control damping force acquired by the MR quarter-vehicle suspension system. The proposed modified Bouc-wen hysteretic force-velocity(F-v) model and its inverse model of MR damper, as well as the proposed continuous modulation(CM) filtering algorithm without phase shift are employed to convert the control damping force into the direct drive current of the MR damper. Moreover, the proposed semi-active sliding mode controller(SSMC)-based MR quarter-vehicle suspension is systematically evaluated through comparing the time and frequency domain responses of the sprung and unsprung mass displacement accelerations, suspension travel and the tire dynamic force with those of the passive quarter-vehicle suspension, under three kinds of varied amplitude harmonic, rounded pulse and real-road measured random excitations. The evaluation results illustrate that the proposed SSMC can greatly suppress the vehicle suspension vibration due to uncertainty of the load, and thus improve the ride comfort and handling safety. The study establishes a solid theoretical foundation as the universal control scheme for the adaptive semi-active control of the MR full-vehicle suspension decoupled into four MR quarter-vehicle sub-suspension systems. | ZHANG Hailong WANG Enrong ZHANG Ning MIN Fuhong SUBASH Rakheja SU Chunyi | 2015 | Chinese Journal of Mechanical Engineering2015，28，1： | 12 |
| 3 | Skyhook-based Semi-active Control of Full-vehicle Suspension with Magneto-rheological Dampers显示文摘The control study of vehicle semi-active suspension with magneto-rheological (MR) dampers has been attracted much attention internationally. However, a simple, real time and easy implementing semi-active controller has not been proposed for the MR full-vehicle suspension system, and a systematic analysis method has not been established for evaluating the multi-objective suspension performances of MR full-vehicle vertical, pitch and roll motions. For this purpose, according to the 7-degree of freedom (DOF) fullvehicle dynamic system, a generalized 7-DOF MR and passive full-vehicle dynamic model is set up by employing the modified Boucwen hysteretic force-velocity (F-v) model of the MR damper. A semi-active controller is synthesized to realize independent control of the four MR quarter-vehicle sub-suspension systems in the full-vehicle, which is on the basis of the proposed modified skyhook damping scheme of MR quarter-vehicle sub-suspension system. The proposed controller can greatly simplify the controller design complexity of MR full-vehicle suspension and has merits of easy implementation in real application, wherein only absolute velocities of sprung and unsprung masses with reference to the road surface are required to measure in real time when the vehicle is moving. Furthermore, a systematic analysis method is established for evaluating the vertical, pitch and roll motion properties of both MR and passive full-vehicle suspensions in a more realistic road excitation manner, in which the harmonic, rounded pulse and real road measured random signals with delay time are employed as different road excitations inserted on the front and rear two wheels, by considering the distance between front and rear wheels in full-vehicle. The above excitations with different amplitudes are further employed as the road excitations inserted on left and right two wheels for evaluating the roll motion property. The multi-objective suspension performances of ride comfort and handling safety of the proposed MR full-vehicle suspension are thus thoroughly evaluated by comparing with those of the passive full-vehicle suspension. The results show that the proposed controller can ideally improve multiobjective suspension performances of the ride comfort and handling safety. The proposed harmonic, rounded pulse and real road measured random signals with delay time and asymmetric amplitudes are suitable for accurately analyzing the vertical, pitch and roll motion properties of MR full-vehicle suspension system in a more realistic road excitation manner. This research has important theoretical significance for improving application study on the intelligent MR semi-active suspension. | ZHANG Hailong WANG Enrong MIN Fuhong SUBASH Rakheja SU Chunyi | 2013 | Chinese Journal of Mechanical Engineering2013，26，3： | 11 |
| 4 | SEMI-ACTIVE CONTROL OF VEHICLE SUSPENSION WITH MAGNETO-RHEOLOGICAL DAMPERS:PART Ⅰ——CONTROLLER SYNTHESIS AND EVALUATION显示文摘A modified skyhook-based semi-active controller is proposed for implementing an asymmetric control suspension design with symmetric magneto-rheological (MR) dampers. The controller is formulated in current form,which is modulated by integrating a continuous modulation and an asymmetric damping force generation algorithms,so as to effectively minimize switching and hysteretic effects from the MR-damper. The proposed controller is implemented with a quarter-vehicle MR-suspension model,and its relative response characteristics are thus evaluated in terms of defined performance measures under varying amplitude harmonic,rounded pulse and random excitations. The sensitivity of the semi-active suspension performance to variations in controller parameters is thoroughly evaluated. The results illustrate that the proposed skyhook-based asymmetric semi-active MR-suspension controller has superior robustness on the system parameter variations,and can achieve desirable multi-objective suspension performance. | WANG Enrong YING Liang WANG Wanjun RAKHEJASubhash SU Chunyi | 2008 | Chinese Journal of Mechanical Engineering2008，21，1： | 8 |
| 5 | SEMI-ACTIVE CONTROL OF VEHICLE SUSPENSION WITH MAGNETO-RHEOLOGICAL DAMPERS PARTⅡ——EVALUATION OF SUSPENSION PERFORMANCE显示文摘The design and analysis of an intelligent vehicle suspension with MR dampers should address hybrid semi-active control goals,such as rejection of current-switching discontinuity and MR-damper hysteresis,asymmetric damping from the symmetric MR-damper design,robustness on the vehicle operation parameter uncertainties and consideration of essential multiple suspension goals. Following the proposed skyhook-based asymmetric semi-active controller (Part I ) for achieving the above goals,herein,a set of suspension performance measures and three kinds of varying amplitude harmonic,rounded pulse and really measured random excitations are systematically defined,and the sensitivity of quarter-vehicle MR-suspension performance to variations in operating conditions is thoroughly analyzed.The results illustrate that the proposed skyhook-hased semi-active MR-suspension in the asymmetric mode yields relatively superior dynamic responses to meet the multiple suspension performances of ride,rattle space,road-holding and dynamic tire force transmitted to the pavement,and has desirable robustness on variations in operating conditions of vehicle load and speed and the road roughness. | WANG Enrong YING Liang WANG Wanjun RAKHEJA Subhash SU Chunyi | 2008 | Chinese Journal of Mechanical Engineering2008，21，2： | 5 |
| 6 | 新型可控磁流液阻尼器的应用研究显示文摘可控磁流液 (MR)阻尼器具有半主动控制、快恢复、体积小、输入功率低、易安装、安全、可靠、静音、商品化等优点 ,是近年来国际工程振动抑制领域广泛研究的热点问题 ,可望取代普通的无源液压阻尼器 ,成为新一代工程振动抑制阻尼器件 ,对工程结构性系统减振性能提高带来革命性的突破 .论文重点介绍该智能驱动器件的基本工作原理和主要的性能特点 ,以及描述其阻尼力对相对速度 (f-v)工作特性的滞环非线性模型 ,并结合路面汽车的性能要求 ,对该类滞环非线性系统的控制问题提出了若干研究方向 。 | 王恩荣 Su Chunyi Rakheja Subhash | 2003 | 南京师范大学学报(工程技术版)2003，3，2： | 2 |
| 7 | SEMI-ACTIVE CONTROL OF VEHICLE SUSPENSION WITH MAGNETO-RHEOLOGICAL DAMPERS:PART III—EXPERIMENTAL VALIDATION显示文摘A hardware-in-the-loop(HIL) test and simulation platform is developed in the laboratory, so as to validate the performance characteristics of the proposed skyhook-based asymmetric semi-active controller in Part I, and examine the validity of the proposed MR-damper model in a system surrounding. A real-time monitor is designed to assess and monitor the responses of the quarter-vehicle model in the HIL platform, and to select the excitation, controller synthesis, and the output displays. A drive current circuit hardware employing PID feedback technique is developed to compensate for the time delays from the servo-controller and drive current circuit, in which a small resistance is integrated in the current amplifier circuit to provide the feedback signal. The experiments were performed to measure the responses of the quarter-vehicle MR-suspension models with fixed current and the proposed semi-active MR-damping variations, under harmonic, rounded pulse and random road excitations. The measured data were compared with the corresponding model results to examine the model and controller validity, and revealed generally good agreements in the model and tested results and very little sensitivity of the tested responses to variations in the sprung mass. The HIL test results validate the effectiveness of the proposed skyhook-based semi-active asymmetric controller and its high robustness against the vehicle load variations in view of the intelligent vehicle suspension design. | WANG Enrong YING Liang WANG Wanjun RAKHEJA Subhash SU Chunyi | 2008 | Chinese Journal of Mechanical Engineering2008，21，4： | 2 |
| 8 | Highly emissive coordination polymer derived from tetraphenylethylene-tetrazole chromophore:Synthesis,characterization and piezochromic luminescent behavior显示文摘Solid-state materials that exhibit pressure stimulus-response characteristics in a manner of emission signal,known as piezochromic luminescence(PCL),demonstrate great potential in photoelectric devices.The weakened luminescence and insignificant color change in the aggregation state,however,hampers their practical applications.Herein,a highly emissive coordination polymer,[Zn2(H4TTPE)(H2O)4]·H2O(CUST-805),is successfully constructed by employing an AIE-active chromophore as the building block.The structural characterization and photophysical properties are systematically studied.Owing to intrinsic twisted conformation and AIE feature of tetraphenylethylene-tetrazole ligand,CUST-805 achieves the visible and reversible PCL from blue to green switched by different external stimuli.The transformation between crystalline and amorphous states is proved to be the origin of present PCL behavior.Moreover,on basis of electron and energy transfer quenching mechanism,the highly selective and sensitive sensor based on CUST-805 is realized,showing the low detection limit of 0.29 ppm towards 2,4,6-trinitrophenol. | Xu Han Jialin Tong Guanyu Ding Chunyi Sun Xinlong Wang Zhongmin Su Jing Sun Li-Li Wen Guo-Gang Shan | 2023 | Chinese Chemical Letters2023，34，1： | 2 |
| 9 | Robust output tracking control for the systems with uncertainties 显示文摘 | Chen Xinkai Su Chunyi | 2002 | International Journal of Systems Science2002，33，4： | 1 |
| 10 | T-S fuzzy model based robust H∞ design for networked control systems with uncertainties 显示文摘 | ZHANG Huaguang YANG Jun SU Chunyi | 2007 | Industrial Informaties IEEE Transactions2007，3，4： | 1 |
| 11 | A- daptive variable structure control of class of nonlinear systerms with unknown Prandtl-Ishlinskii hystersis 显示文摘 | SU Chunyi WANG Qingqing CHEN Xinkai | 2005 | IEEE Trans Automatic Control2005，50，12： | 1 |
| 12 | GENERATION OF ASYMMETRIC F-v CHARACTERISTICS FOR SYMMETRIC MR DAMPERS显示文摘一个不对称的抑制力量产生算法原来被建议为对称的 magneto-rheological (先生) 产出不对称的力量速度特征水坝 pers。命令水流以一种不对称的方式被提出由采用“开关”使对称的 MRdampers 激动没有阶段移动,响应速度的方向的控制法律,和一个光滑的调整函数被开发在当前切换的断绝引起的抑制力量压制强壮的 transients。建议算法的有效性被由 modulating 与不对称的先生阻尼分析一个季度车辆暂停系统的动态回答评估命令水流进不对称的方式。模拟结果证明建议算法能完成在不对称的抑制力量比率和力量速度弯曲的冲突要求之间的更好的妥协光滑,和不对称的抑制先生暂停设计能理想地改进成立的道路并且骑车辆运动的表演。建议算法能通常与控制器合成被合并与对称的先生水坝 pers 认识到一个聪明的车辆暂停图案。 | WANG Enrong YE Biaoming MA Xiaoqing SU Chunyi RAKHEJA Subhash | 2006 | Chinese Journal of Mechanical Engineering2006，19，2： | 1 |
| 13 | T-S fuzzy-model-based robust H∞ design for networked control systems with uncertainties显示文摘 | ZHANG Huaguang YANG Jun SU Chunyi | 2007 | IEEE Transactions Industrial Informatics2007，3，4： | 1 |
| 14 | Adaptive control of a class of nonlinear system with fuzzy logic显示文摘 | YURY Stepanenko | 1994 | IEEE Transations on Fuzzy Systems1994，2，4： | 1 |
| 15 | A nonlinear disturbance observer for multivariable systems and its application to magnetic bearing systems显示文摘 | Chen Xinkai Su Chunyi Toshio Fukuda | 2004 | IEEE Trans on Control Systems Technology2004，12，4： | 1 |
| 16 | T S fuzzymodel-based robust H∞ design for networked control systems with uncertainties显示文摘 | Zhang Huaguang Yang Jun Su Chunyi | 2007 | IEEE Transactions on Industrial Informatics2007，3，4： | 1 |
| 17 | Robust Vibra- tion Control for Flexible Arm Using the Sliding Mode Method显示文摘 | Chen Xinkai Su Chunyi Fukuda T | 2003 | Asian Journal of Control2003，5，4： | 1 |
| 18 | Robust Motion/Force Control of Mechanical Systems with Classical Nonholonomic Constraints显示文摘 | Yury Stepanenko | 1994 | IEEE Transactions on Automatic Control1994，38，3： | 1 |
| 19 | Ro11- and Pitch- plane Coupled Hydro-pneumatic Suspension 显示文摘 | Dongpu Cao Subhash Rakhejab Chunyi Su | 2010 | Vehicle System Dynamics2010，，3： | 1 |
| 20 | Dynamic analy- ses of roll plane interconnected hydro-pneumatic suspension systems显示文摘 | Cao Dongpu Subhash Rakheja Su Chunyi | 2008 | International Journal of Vehicle Design2008，47，： | 1 |
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