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IEEE International Conference on Mechatronics and Automation

作者： Songli Wang Jun Liu Yihe Liu Weimin Ge Tianjin key laboratory of the Design and Intelligent Control of the Advanced Mechanical System Tianjin University of Technology BinshuiXidao 391 Tianjin China Tianjin key Laboratory of Organ Transplantation Transplant surgery of Tianjin First Central Hospital Fukang Road 24 Tianjin China

ISBN: (纸本)9781509023974

The paper attempts to analyze the dynamic characteristics in the perfusion process of the hepatic vessel. A model of rugged vessel with a foreign matter was established based upon medical imaging data. The fluid flowing in the rugged vessel was simulated using the perfusion method of the symmetric pulsating flow (SPF) and the steady flow under the bidirectional fluid-structure interaction (FSI). The simulation results, on the one hand, demonstrate the feasibility of SPF within the perfusion process of the rugged vessel in liver. On the other hand, the results clearly show the dynamic behaviors which accorded with actual medical results. Comparing the perfusion results of the rugged vessel using SPF with the steady flow, the difference of vascular deformation is not obvious, while the peak of velocity in the rugged vessel used SPF is about 50% higher than that of the steady flow, that reveals SPF is more likely to take away the foreign matter. The study will be helpful to improve the quality of the donor liver and reduce the influence of subjective factors on the quality of cleaning, and it provides theoretical basis for the liver transplantation.

关键词： Hepatic Perfusion Rugged Vessel Symmetric Pulsating Flow Bidirectional Fluid-Structure Interaction Dynamics

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Research on the Performance of Electro-hydraulic Proportional Flow Valve controlled by Pilot Pump

Research on the Performance of Electro-hydraulic Proportiona...

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2015 International Conference on Fluid Power and Mechatronics

作者： Yunxiao Hao Jiahai Huang Wenyong Li Long Quan Bin Zhao Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Educationand Shanxi ProvinceTaiyuan University of Technology

Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow capacity and increases system throttling loss. In large flow occasion, flow only can be indirectly controlled by changing valve opening area for the limitation of the structure. So a low energy consumption, high controllable electro-hydraulic proportional valve which is structured by a hydraulic transistor(Valvistor) and a small displacement hydraulic pump driven by a servo motor is introduced. Based on the Valvistor valve flow amplification principle, main valve flow is controlled by pilot pump flow which is controlled by changing rotation speed without the influence of load variety. In the research, it's known from the analysis of the new principle valve steady flow characteristics that feedback throttle slot pre-opening will cause the decrease of the main valve flow as pressure drop increases. Soa method of pressure differential-pilot pump rotation speed compensation is put forward and it can obtain ideal flow characteristic. Then the dynamic mathematical model is established and the main valve stability criterion is derived. The influence of the valve parameters on main valve performance is analyzed and simulated. The results provide a new method forthe large flow electro-hydraulic proportional control system.

关键词： Valvistor Proportional flow control valve Pressure differential-rotation speed compensation Steady state characteristics

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Modelling and analysis of planar robotic arm dynamics based on an improved transfer matrix method for multi-body systems 14

Modelling and analysis of planar robotic arm dynamics based ...

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14th International Federation for the Promotion of Mechanism and Machine Science World Congress, IFToMM 2015

作者： Chen, W. Li, H. Zhang, X.Z. Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin China Academy of Military Medical Sciences Tianjin China

ISBN: (纸本)9789860460988

An improved transfer matrix method for multi-rigid-body systems is presented based on the structural characteristics of the manipulator and the relations between motion transfer and force transfer. Thus, a new model applicable to serial robots is obtained by using of discrete time transfer matrix method. Based on the improved method, a unified model for a manipulator with n DOF is derived. This model contains both kinematic and dynamic characteristics of the system. According to the motion transformation relation between the joint space and the operational space of the manipulator, the solution and the procedure are developed for both forward and inverse kinematics of the unified model. The simulation results of a 2DOF planar manipulator show the rightness of the modelling method and exhibit its superiority to other methods.

关键词： Inverse kinematics

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Zero Cross-Talk Regimes in Dually Modulated Mutually-Coupled Nano-lasers

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Journal of Physics: Conference Series 2017年第1期844卷

作者： H Han M J Zhang Y C Wang K A Shore Taiyuan University of Technology College of Physics and Optoelectronics Key Laboratory of Advanced Transducersand Intelligent Control System Ministry of Education Taiyuan 030024 China. School of Electronic Engineering Bangor University Wales LL57 1UT UK.

The modulation properties of dually modulated mutually-coupled nano-lasers have been analyzed using rate equations which include the Purcell cavity-enhanced spontaneous emission factor F and the spontaneous emission coupling factor β. Analysis of the dynamical response of modulated mutually-coupled nano-lasers reveals the existence of regimes of zero cross-talk wherein the response of one nano-laser is not impacted by the dynamics of the other nano-laser. The availability of zero-cross talk regimes is seen to offer opportunities for exploitation in photonic integrated circuits.

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Distributed fiber temperature sensor using a laser diode modulated by a pseudo-random bit sequence

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Chinese Optics Letters 2015年第8期13卷 23-26页

作者：柴晶张明江刘毅李岚许卫鹏王云才 Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of Technology Institute of Optoelectronic Engineering College of Physics and OptoelectronicsTaiyuan University of Technology

We propose and demonstrate a scheme to measure the distribution of temperature along an optical fiber based on pseudo-random sequence modulation. In our experimental work, current modulation with a pseudo-random bit sequence （PRBS） is applied to a laser diode that serves as the Brillouin pump light and reference light. Because of the independence of the spatial resolution on the PRBS length~ the measurement range can be extended while maintaining high spatial resolution using a long PRBS length. Temperature-induced changes in a Brillouin frequency shift of 250 m fiber sections are clearly observed with 54 cm spatial resolution by this method.

关键词： Image resolution Modulation Optical fibers

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Experimental investigation of a UWB direct chaotic through-wall imaging radar using colpitts oscillator

Experimental investigation of a UWB direct chaotic through-w...

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IET International Radar Conference 2015

作者： L. Liu R. X. Ma H. Xu W. K. Wang B. J. Wang J. X. Li Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province

ISBN: (纸本)9781510822023

An ultra-wideband direct chaotic through-wall imaging radar is proposed and experimentally demonstrated. The chaotic signal is generated by an improved Colpitts oscillator. Target range information is achieved by the cross-correlation between the time-delayed reflected echo signal and the replica of the transmitted chaotic signal. Two-dimensional image is obtained by synthetic aperture technology and back projection algorithm. Experimental results of single target and double targets show that the proposed chaotic radar system can through 20cm thick wall to detect and locate the target.

关键词： Through-wall radar Chaotic radar UWB Colpitts oscillator Synthetic aperture

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Research on the Performance of Hydraulic Excavator with Pump and Valve Combined Separate Meter In and Meter Out Circuits

Research on the Performance of Hydraulic Excavator with Pump...

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2015 International Conference on Fluid Power and Mechatronics

作者： Lei Ge Zhixin Dong Weinan Huang Long Quan Jing Yang Wenyong Li Taiyuan University of Technology Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education

Conventional hydraulic actuator is controlled by mechanically connected orifices valve. The controllability of this method is poor and the energy consumption is huge especially under the over-running condition. So a novel system configuration of the hydraulic excavator is presented to improve the problem mentioned above, in which boom cylinder, stick cylinder and swing motor are controlled with separate meter in and meter out technology, bucket cylinder and travel motors are controlled with conventional valves. Firstly, the paper provides a comprehensive review on the development of the separate meter in and meter out technology. Then the principles of load sensing system and SMISMO system applied on the excavator are illustrated though two diagram to show the difference of the two systems. And then a virtual prototype based on the real physical structures is established, which consists of the hydraulic excavator mechanical structure with multi-body dynamics and electro-hydraulic system. The model is verified by the statics and dynamics experiments. Then the dynamic, static performances as well as the energy consumption characteristics of the boom, arm and swing actuators are investigated under the condition of load sensing hydraulic system and the proposed system using the virtual prototype. The control strategy of the actuators is formulated according to their load condition and operation characteristics also based on the detailed analysis. After that, the physical prototype based on the proposed configuration system is established and its performance is tested. The experimental results show that the accuracy of the virtual prototype is validated;the proposed configuration system can significantly decreases the pressure losses through the valve and improve the energy efficiency of the machine;the pressure shocks within hydraulic actuators is decreased as well, thus the stationarity of the whole machine is improved accordingly.

关键词： flow matching separate meter in and meter out pressure and flow combined control pump and valve hybrid control

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Fiber faults diagnosis based on correlation detection in passive optical network

Fiber faults diagnosis based on correlation detection in pas...

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International Conference on Optical Communications and Networks (ICOCN)

作者： Xiaogang Yi Anbang Wang Tong Zhao Yuncai Wang University of Technology Shanxi Province China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Shanxi Province Taiyuan

ISBN: (纸本)9781467373746

In this paper, we review the correlation detection technique (CDT) for fiber faults diagnosis and describe our chaotic signal- and communication signal-based correlation detection schemes in passive optical network (PON). The results show that spatial resolution of 2cm and dynamic range of about 20.8dB can be achieved when chaotic signal is used. Utilizing communication signal itself as the probe light, we achieve a spatial resolution of 8cm and detection range of above 23km.

关键词： Correlation Passive optical networks Chaotic communication Optical fibers Spatial resolution

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Characteristics of a Piloted Digital Flow Valve Based on Flow Amplifier

Characteristics of a Piloted Digital Flow Valve Based on Flo...

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2015 International Conference on Fluid Power and Mechatronics

作者： Taotao Li Jiahai Huang Yanhong Bai Long Quan Shengguo Wang Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of Technology

Hydraulic switching techniques which have less throttling losses, good repeatability and can be controlled intelligently have been largely developed. The biggest challenge is the hydraulic fluctuation. It is generated in the process of opening and closing the valve. A two-stage digital flow valve operated by Pulse Width Modulation(PWM) signal is studied in this paper. The main stage is cartridge valve based on flow amplifying principle;the pilot stage is high-speed on/off valve. The fluctuation characteristic of the digital flow valve is investigated using theoretical derivation and simulation analysis. The results show that the outlet flow fluctuation is influenced by many parameters such as the frequency and duty ratio of PWM signal, the volume of control chamber, etc. It can be weakened through the proper design of these parameters. Although the fluctuation exists, the mean outlet flow can be proportionally controlled by adjustment of the duty ratio of the control signal.

关键词： Flow valve,High-speed on/off valve,PWM,cartridge valve

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Dynamic hazard of belt transport tracking and discerning method based on mean shift

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International Journal of Mining and Mineral Engineering 2015年第4期6卷 309-320页

作者： Qiao, Tiezhu Duan, Yanfei Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan030024 China

For the conveyer belt in coal mine often damaged by hazards such as stones or metals in transit which can cause a longitudinal tear, and the feature of hazards' status changed when transportation belt being torn, a Mean shift tracking and monitoring method was approached. Infrared spectrum imaging model was established for hazard, and extracted hazard grey value according to reflected background radiation differences between hazard and coal in the best wavelength range. Hazard model is established using grey space joint histogram, Mean shift vector is established with bandwidth matrix and recursive equations are given in EM like manner. Experiments show that when hazards tearing the tape, the algorithm can be real-time tracking and monitoring the state of hazards to determine the tape tear. © 2015 Inderscience Enterprises Ltd.

关键词： Image processing

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