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Comparative Study between Bone Tissue engineering Scaffolds with Bull and Rat Cancellous Microarchitectures on Tissue Differentiations of Bone Marrow Stromal Cells： A Numerical Investigation

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Journal of bionic engineering 2018年第5期15卷 924-938页

作者： Xianbin Zhang He Gong Ruoxun Fan Juan Fang State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130022 China Department of Engineering Mechanics Jilin University Changchun 130022 China Department of Biomaterials Institute of Clinical Dentistry University of Oslo Oslo Norway Department of Automotive Engineering Jilin Institute of Chemical Technology Jilin 132022 China School of Civil Engineering Jilin Jianzhu University Changchun 130118 China

Tissue-engineered bone scaffolds provide temporary mechanical support for bone tissue growth. Mechanical stimuli are transferred to seeded cells through the scaffold structure to promote cell proliferation and differentiation. This paper presents a numerical investigation specifically on bone and cartilage tissue differentiation with the aim to provide a theoretical basis for scaffold design and bone defect repair in clinics. In this study, the scaffold structures were established on the basis of cancellous bone microarchitectures. For finite element simulations, inlet velocity and compressive strain were applied under in vitro culture conditions. The influences of this scaffold mor- phology and macro-level culture conditions on micro-mechanical stimuli at scaffold surfaces were investigated. Correlations between the microarchitectural parameters and the mechanical parameters, as well as the cell differentiation parameters were analyzed. Highly het- erogeneous stress distributions were observed on the scaffolds with irregular morphology. Cell differentiation on the scaffold was more sensitive to the inlet velocity than the axial strain. In addition, cartilage differentiation on the scaffolds with structures comprising more plate-like trabeculae was more pronounced than on those with more rod-like trabeculae. This paper is helpful to gain more insight into the mechanical environments under in vitro culture conditions that approximate the in vivo mechanical environments of Bone Marrow Stromal Ceils （BMSCs）.

关键词： mechanoregulation theory cancellous bone finite element method computational fluid dynamics microarchitecture

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A Corrective control Approach For Combined Heat And Power System integrated with Multiple Energy Storage System

A Corrective Control Approach For Combined Heat And Power Sy...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Lin, Qunli Shen, Xinwei Sun, Yong Li, Zhenyuan Guo, Qinglai Sun, Hongbin Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Grid Corp. of China Jilin Power Grid Company Jilin China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (纸本)9781728135205

The integrated Energy System (IES) becomes very important nowadays, however, the coupling between multiple energy systems will bring new challenges to the security control of the IES, such as combined heat and power (CHP) system. The corrective control means that the operations can be adjusted after contingency happens to eliminate the constraints violation in the contingency state such as the transmission outage or generator outage. This paper proposes a corrective control approach for CHP system integrated with the energy storage system based on security constrained economic dispatch (SCED) model. Case studies based on the IEEE 9-bus CHP system are presented to verify the method. The case result shows that the energy storage device can solve the ramping of the unit's output adjustment well. The corrective control method is more scientific and economical. © 2019 IEEE.

关键词： Outages

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Wind farm active voltage regulation strategy of transient support improvement 8

Wind farm active voltage regulation strategy of transient su...

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8th Renewable Power Generation Conference, RPG 2019

作者： Yang, Cui Peng, Song Xuekun, Cheng Ying, Qiao Xiaosheng, Wang Jingbo, Liu State Grid Jibei Electric Power Co.Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Xicheng District Beijing China Grid-connected Operation Technology Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Xicheng District Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Dept. of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (纸本)9781839531255

The cumulative installed capacity of wind power worldwide has grown rapidly in recent years. Fixed reactive power control is adopted by wind turbines (WTs) to receive cycle instruction of wind farm (WF) automatic voltage control system (AVCS). It does not have active voltage regulation (AVR) capability, which reduces the reliability of power system operation. Firstly, two ways of WTs AVR which QV droop control and Vac control mode are introduced in this paper. On the basis, the problems of reactive power circulation and control points inconsistency during multiWTs voltage regulation are discussed. The problems are solved by coordination of WTs of WF AVR strategy. WF voltage transient support capability is promoted by the strategy. Effectiveness is verified by simulation case of the proposed method. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Reactive power

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ANALYSIS OF FATIGUE LIFE LOSS OF DRIVETRAIN OF DOUBLY-FED WIND TURBINES UNDER SHORT-CIRCUIT FAULT OF POWER GRID

ANALYSIS OF FATIGUE LIFE LOSS OF DRIVETRAIN OF DOUBLY-FED WI...

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International Conference on Renewable Power Generation

作者： Qiu Shilong Li Hui Gong Lijiao Wang Bin Chai Zhaoseng Wu You Department of Mechanical and Electrical Engineering Shihezi University Shihezi China State Key Laboratory of Power Drivetrain Equipment and System Security Chongqing University Chongqing China State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Department of Electrical Engineering) Tsinghua University Haidian District Beijing China State Key Laboratory of Power Drivetrain Equipment and System Security Chongqing University Chongqing China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The shafting drivetrain of the doubly fed wind turbine is the part with the highest failure rate. The electromagnetic torque fluctuation caused by the grid fault easily results in the torsional vibration fatigue loss of the shaft. Accordingly, the influences of drivetrain fatigue life loss under different grid faults require investigation. Firstly, the four-mass model of the drivetrain is constructed on the basis of MATlab/Simulink. Secondly, the electromagnetic torque response under short-circuit fault of the grid is obtained via model simulation. Finally, the effects of different types of grid faults on the fatigue life of the drivetrain are analysed through Mlife. Results show that the electromagnetic torque fluctuation load generated by grid fault has no apparent influence on the fatigue life of the drivetrain in the short term, but the cumulative effect of short-term damage will aggravate the fatigue life loss of the drivetrain and increase the failure risk of the component. The electromagnetic torque generated by the three-phase symmetrical short-circuit is the most violent and has the maximum effect on the fatigue life of the drivetrain.

关键词： WIND TURBINE SHORT-CIRCUIT FAULT TORSIONAL VIBRATION FATIGUE LIFE DRIVETRAIN

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Gain-Scheduled Fault Diagnosis of In-Wheel Motor Electric Vehicles 29

Gain-Scheduled Fault Diagnosis of In-Wheel Motor Electric Ve...

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第29届中国控制与决策会议

作者： Jingxin Yuan Yulei Wang Shuyou Yu Hong Chen The State Key Laboratory of Automotive Simulation and Control Department of Control Science and EngineeringJilin University

ISBN: (纸本)9781509046584

This paper presents a gain-scheduled fault diagnosis approach for in-wheel motor(IWM) driven electric vehicles. The dynamics of vehicle slip ratio, which is usually used for vehicle stability and torque allocation, is modeled to monitor the motor torque and evaluate the loss of effectiveness. A gain-scheduled extended state observer(GSESO) is investigated to estimate the fault in each of in-wheel motors. With the aid of gain-scheduled techniques, the formulation of fault diagnosis for IWM electric vehicles is transformed to an output feedback gain-scheduled robust control problem. simulation results using a high-fidelity full-vehicle model in Ve DYNA validate the effectiveness of the proposed approach.

关键词： Electric Vehicle Fault Diagnosis Gain-Scheduled

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Accommodating Renewable Energy Sources into the Modern Power System via a General Coordinated Mechanism

Accommodating Renewable Energy Sources into the Modern Power...

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IEEE Power and Energy Society General Meeting

作者： Jing Yu Ye Guo Hongbin Sun Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen China State Key Lab of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

In order to better accommodate renewable energy sources (RESs), a general coordinated mechanism for modern power system has been proposed, which is simultaneously appropriate for economic dispatch and market clearing under the current structure of wholesale markets. In which, the system operator can achieve a global optimum under uncertainties by investing independent aggregators (IAs) with better autonomies on trade-offs between expected profits and risks. Meanwhile, IAs with RESs are free to model their internal uncertainty in a heterogeneous manner and integrate the local information into tailored bids without revealing privacy. Moreover, a parametric-programming-based distributed (PPD) algorithm is designed to support the once-daily communication mechanism. The case studies validated the performance of the proposed mechanism.

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A Dynamic-decoupling controller of Current for Permanent Magnet Synchronous Motor 29

A Dynamic-decoupling Controller of Current for Permanent Mag...

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第29届中国控制与决策会议

作者： Mingxing Zhao Haiyan Zhao Hong Chen Department of Control Science and Engineering Jilin University State Key Laboratory of Automotive Simulation and Control Jilin University

ISBN: (纸本)9781509046584

The problem of current coupling in permanent magnet synchronous motor(PMSM) will affect control performance of the motor. The id = 0 control in the field-oriented control(FOC) can realize the static decoupling of current and improve the steady-state performance of the system. But this method does not solve the dynamic coupling problem of current, which will reduce the dynamic performance of the motor. Therefore, aiming at the problem of current dynamic coupling in PMSM system, a dynamic-decoupling controller of current based on Lyapunov stability theory is proposed in this paper. In order to solve the problem of controller gain selection in engineering, a random algorithm is adopted to narrow the range of controller gain. Compared with PID controller, the proposed controller can greatly decrease the number of controller gain and reduce the burden of controller gain selection simultaneously. Finally, the validity of proposed controller is verified by the model of PMSM system established in MATlab/Simulink.

关键词： Permanent Magnet Synchronous Motor Field-oriented control Dynamic-decoupling controller Lyapunov Stability Random Algorithm

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Model Predictive control Oriented Shared Steering control for Intelligent Vehicles 29

Model Predictive Control Oriented Shared Steering Control fo...

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第29届中国控制与决策会议

作者： Linhuan Song Hongyan Guo Fei Wang Jun Liu Hong Chen State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering Jilin University

ISBN: (纸本)9781509046584

It presents a constrained model predictive control(MPC) scheme to discuss the shared steering control with a *** considers the shared control from the following two aspects that are the safety of vehicle and the driving intention of *** the safety,obstacle avoidance is very important and it is taken as ***,the vehicle's shape is *** the driving intention of human,the vehicle follow the driver's steering command as an objective in the ***,simulations are carried out to validate the effectiveness of the constrained MPC approach.

关键词： Model predictive control Shared control Vehicle model

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AFR control of a Gasoline Engine Using Triple-step Method 29

AFR Control of a Gasoline Engine Using Triple-step Method

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第29届中国控制与决策会议

作者： Jiamei Lin Hong Chen Ping Wang State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering Jilin University

ISBN: (纸本)9781509046584

control of the air-fuel ratio(AFR) in gasoline engines is of imminent importance when aiming at minimizing calibration effort and meeting performance *** this paper,this is achieved by employing triple-step method,which keeps the air-fuel ratio close to the stoichiometric *** structure of the designed controller consists of three parts:steady-state control,feed-forward control concerning the reference variations and error feedback *** on engine speed,air mass flow through throttle and the exhaust gas oxygen(EGO)sensor,a straightforward design process is ***,the simulation results in the environment of en-DYNA with a reasonable common four-cylinder engine model show the efficiency of the proposed method.

关键词： Air-fuel ratio control Triple-step method Mean-value model Gasoline engine

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Design of Model Predictive controller Based on Extended state Observer 29

Design of Model Predictive Controller Based on Extended Stat...

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第29届中国控制与决策会议

作者： Zongli Li Fang Xu Dinan Liang Hong Chen State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering Jilin University

ISBN: (纸本)9781509046584

This paper proposes a Unear model predictive control(LMPC) based on extend state observer(ESO) which can approximate the control performance of the nonlinear model predictive control(NMPC).The ESO is used to estimate the disturbance caused by the linearization of actual nonlinear *** estimated disturbance is added into the system model of the LMPC controller *** low speed control problem of the permanent magnet DC(PMDC) motor is *** simulation results show that this method can obtain satisfied control performance and the ESO can estimate the uncertain disturbance accurately caused by the linearization if the parameters of ESO are chosen appropriately.

关键词： Model Predictive control Extend state Observer Uncertain Disturbance PMDC Motor

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