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15th IEEE International Conference on mechatronics and Automation, ICMA 2018

作者： Wang, Zhigang Yun, Zerong Wang, Lingling Wang, Jinghui Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China Tianjin University of Technology Tianjin China Natinal Institute of Metrology China Beijing China

ISBN: (纸本)9781538660720

Blackbody radiation source is used as a standard device for infrared thermometer, it plays increasingly important roles in the field of calibration. Through experiment discoveries that it is a typical nonlinear system and has a large transport delay when the blackbody is rise temperature or cooling in order to reach set temperature points. Based on the temperature control of blackbody is a kind of typical multi-variable, strong coupling and time-varying nonlinear control system. The paper proposes applying the theory of active disturbance rejection controller (ADRC) to suppress various disturbances and improve the dynamic performance of blackbody radiation source. First of all, describing the working principle of blackbody radiation source and building its mathematical model. Secondly, introducing the control method of ADRC, which is applied to the temperature control system of blackbody radiation source. Finally, through MATLAB/SIMULINK platform to simulate and compare the temperature control performances of blackbody among ADRC, PID and Smith predictor(SP) control strategies. The simulation results show that proposed ADRC algorithm improves the abilities of anti-interference of system and it is without overshoot. In addition, the results also indicated that the control method of ADRC shortens plant stable time and has a strong prospect for practical applications. © 2018 IEEE.

关键词： Temperature control

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Ionic liquid choline chloride-urea dissolving cattle bone extracted hydroxyapatite

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Journal of Bionanoscience 2018年第3期12卷 437-441页

作者： Song, Wei Yang, Yan Deng, Yu Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China Department of Osteo-Internal Medicine Tianjin Hospital Tianjin300211 China School of Materials Science and Chemical Engineering Tianjin University of Science and Technology Tianjin300457 China

The dissolving technique of ionic liquid (IL) was applied in extraction process of hydroxyapatite (HAp). Product HAp was extracted by IL choline chloride-urea (ChCl-Urea) dissolving cattle bone. The optimum conditions for regeneration process of cattle bone were determined by single factor, orthogonal and verification experiments. IR spectra of regenerated bone, undissolved bone and raw bone showed that the main groups of regenerated bone did not change. It was indicated that ionic liquid did not damage the bone collagen of raw bone, and the collagen was only dissolved by IL. IR spectrum of the product HAp revealed that its components were similar to those of the natural bone. SEM pattern showed that the crystal shape of the product HAp appeared rod-like shape mostly, and the crystal structure was relatively complete. XRD diffraction explained that there was no difference between product HAp and standard HAp for the crystalline form and compositions. Copyright © 2018 American Scientific Publishers All rights reserved.

关键词： Hydroxyapatite

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Research on homoclinic orbits and homoclinic bifurcation motion in a typical triple-well potential vibration system 25

Research on homoclinic orbits and homoclinic bifurcation mot...

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Feng, Jingjing Zhang, Wei Lui, Haiying Hu, Wenhua Beijing University of Technology College of Mechanical Engineering Beijing Key Laboratory on Nonlinear Vibrations and Strength of Mechanical Structures Beijing China Tianjin University of Technology School of Mechanical Engineering Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin China Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China

ISBN: (纸本)9781510868458

The pull-in phenomenon is an important sign of instable movement for electrostatic micro-resonators. In present paper, the problems of homoclinic orbits and homoclinic bifurcation motion in a typical triple-well potential system with non-Z2 symmetric and higher-order nonlinear terms are studied, which is used to describe corresponding nonlinear dynamical behaviors of pull-in and complex vibration phenomena in typical micro-resonator. For the complexity between the equilibrium points and the phase space curves in triple-well potential system, the non-Z2 symmetric homoclinic orbits that are corresponding to the pull-in phenomenon are discussed under a certain energy input condition. Because the fact of the air damping in the actual micro-resonator cannot be ignored, the autonomous system containing the damping terms is studied directly. The further improved Padé approximation method can be applied to directly obtain analytical expressions of special homoclinic orbits with completely non-Z2 symmetry in corresponding conservative system, which contain not only the conventional Z2 symmetric nonlinear terms, but also the non-Z2 symmetric and higher-order nonlinear terms. In addition, the phase diagrams and bifurcation parameter curves of homoclinic orbit in corresponding autonomous system are obtained when the homoclinic bifurcation occurs. The present method is valid by comparing with the phase diagrams of homoclinic orbits from numerical method. Copyright © (2018) by International Institute of Acoustics & *** rights reserved.

关键词： Numerical methods

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Primary resonance analysis and optimal design of microbeam resonator with variable cross section under electrostatic actuator 25

Primary resonance analysis and optimal design of microbeam r...

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Liu, Cheng Hao, Shuying Zhang, Kunpeng Feng, Jingjing Zhang, Wei Tianjin University of Technology School of Mechanical Engineering Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin China Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China Beijing University of Technology College of Mechanical Engineering Beijing Key Laboratory on Nonlinear Vibrations and Strength of Mechanical Structures Beijing China

ISBN: (纸本)9781510868458

In this paper, the doubly clamped microbeam-based resonator which actuated by two electrodes is investigated. A section parameter is proposed to describe the microbeam variables in the upper and under section. The differential equation is derived by considering the influence of neutral surface tension and the nonlinearity of electrostatic force. The Galerkin and Newton Cotes methods are used to obtain reduced-order model. The nonlinear vibration behaviors of system at equilibrium point are analysed. First, the frequency response is obtained by the method of multi-scale (MMS). The relationship between section parameter and mechanical property of the microresonator is studied. Then, the system is optimized by considering the relationship between section parameter and the actual physical parameters. Finally, the finite element method through COM-SOL software is used to verify the theoretical results, and the two results are very close to each other in the stable region. The research results provide a good reference for the design of microresonator. © 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved.

关键词： Resonators

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Comparison on Thermodynamic Performances Between Basic and Regenerative Sub-critical Organic Rankine Cycles Coupled with Low Grade Heat Source

Comparison on Thermodynamic Performances Between Basic and R...

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The 5th advanced Materials,Mechanics and Structural Engineering Conference(AMMSE 2018)

作者： Pengfei Yuan Chao Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology)

The coupling effects of low grade heat source on thermodynamic performances of both the basic and regenerative sub-critical Organic Rankine cycle(ORC) systems are investigated and *** inlet pressure and turbine inlet temperature are treated as independent *** system exergy efficiency is selected as the thermodynamic performance *** low grade heat source are waste hot water with temperature range of 373.15 K to 423.15 *** studies are carried out using eight common organic working fluids to recover heat energy,and relevant operating conditions are obtained *** results indicate that both hot fluid inlet temperature and the allowable minimum hot fluid outlet temperature influence the optimal working fluid,relevant turbine inlet condition and system exergy *** system exergy efficiency increases monotonously with increasing of hot fluid temperature for both ORC *** comparison to the basic cycle configuration,optimal system exergy efficiency for the regenerative system using the same working fluid is not changed if relevant turbine inlet vapor is saturated,but is significantly improved if relevant turbine inlet vapor is ***,the optimal working fluid is dependent on the heat source temperature and specific cycle configuration.

关键词： Comparison on Thermodynamic Performances Between Basic and Regenerative Sub-critical Organic Rankine Cycles Coupled with Low Grade Heat Source Basic

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Temperature control Based on Fuzzy-PID Algorithm for the Blackbody Radiation Source

Temperature Control Based on Fuzzy-PID Algorithm for the Bla...

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IEEE International Conference on mechatronics and Automation

作者： Zhigang Wang Lingling Wang Zerong Yun Jinghui Wang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China National Institute of Metrology China Beijing China

Blackbody radiation source is a key equipment in the traceability process of temperature measurement. In infrared temperature measurement, stable and consistent temperature control of the blackbody radiation sources is required. And in the process of calibration, it is a key element that a blackbody radiation source can produce a fixed temperature. Effective control of its temperature is, therefore, crucial. Due to the change of parameters and the uncertainty of loads, the performance requirements for conventional Proportional, Integral and Differential (PID) controller are high. But the control effect of the conventional PID controller on the temperature control system is not perfect. So the Fuzzy-PID control algorithm is simulated with software for the temperature control system of the blackbody radiation source in this paper. Compared with the conventional PID control algorithm, the Fuzzy-PID control has advantages of quicker response, smaller overshoot and more stable performance. It is of a certain reference value to improve the temperature control performances in the actual industrial production applications.

关键词： Temperature control Temperature measurement PI control PD control Temperature sensors Cavity resonators

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Flow Mechanism of Cooling Effectiveness Improvement for the Cylindrical Film Cooling Hole with Contoured Craters

Flow Mechanism of Cooling Effectiveness Improvement for the ...

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The 5th advanced Materials,Mechanics and Structural Engineering Conference(AMMSE 2018)

作者： Linchao Bai Chao Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology)

In this paper,a typical cylindrical hole with contoured craters is investigated in terms of the downstream flow field by numerical method at blowing ratios of 0.5,1 and *** flow field and the cooling effectiveness are analyzed using threedimensional Reynolds-averaged Navier-Stokes equations with the shear stress transport turbulence *** comparison to the cylindrical hole,the cratered hole shows a wider coolant coverage in lateral direction and a lower penetration into the mainstream flow due to the larger hole exit ***,the interaction between the coolant and the curved protrusion induces a new anti-kidney-shaped vortex pair,which can obviously improve the cooling coverage and thus the cooling *** areaaveraged cooling effectiveness for the cratered hole is always higher than that for the cylindrical hole at all three blowing ratios.

关键词： Flow Mechanism of Cooling Effectiveness Improvement for the Cylindrical Film Cooling Hole with Contoured Craters

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Optimization of the Circuit Parameter in Class-E Power Amplifier in the Two-coil Wireless Power Transfer system

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IOP Conference Series: Materials Science and Engineering 2020年第1期740卷

作者： Zhuang Sun Qing Liu Kun Li Bin Hu Haibo Zhao Yankai Shi Shijie Zhang Yang Liu Tianjin Key Laboratory of Film Electronic and Communication Device Tianjin University of Technology Tianjin China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) Tianjin China Tianjin Institute of Power Sources Tianjin China

In this paper, the circuit parameters of the Class-E power amplifier are investigated and optimized to achieve the maximum of output power and efficiency in a two-coil Wireless Power Transfer (WPT) system. The circuit is simulated with software named Saber. Working frequency, the value of capacitors and inductor, which has relationship with the output power and efficiency, are investigated during the simulation. With the simulation results, it is found that the frequency and the shunt capacitor need to be optimized for high performance of the wireless power transfer system.

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The Temperature control of Blackbody Radiation Source Based on ADRC

The Temperature Control of Blackbody Radiation Source Based ...

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IEEE International Conference on mechatronics and Automation

作者： Zhigang Wang Zerong Yun Lingling Wang Jinghui Wang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China Natinal Institute of Metrology China Beijing China

关键词： Mathematical model Simulation Temperature measurement Cooling Heating systems Temperature sensors

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Development of a New Fluid Shearing system for Cell Culture in Vitro

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IOP Conference Series: Materials Science and Engineering 2019年第1期626卷

作者： Pengfei Wu Xin Wang Lilan Gao Chunqiu Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin 300384 China

Cells in organisms are surrounded by fluid environment, and the fluid shear force produced by this fluid affects the morphology and behaviour of cells. The stimulation of cells in a bioreactor is a key area of research in tissue engineering and regenerative medicine. This paper introduces a fluid shear system for cell culture in vitro. The main component of system is a perfusion chamber, which consists of an inoculation room and a perfusion cap. The inoculation room is used for the common laboratory consumables of microorganism or cell culture, such as petri dish, six-well plate and so on. It can realize to six independent experiments of fluid shear; the new type of perfusion cap was designed to obtain a reasonable cavity by hydrodynamic simulation. The cap was produced by casting technology. It not only has the function of cap with nozzles, but also has the function of sealing. With peristaltic pumps, nozzles, liquid storage bottles and so on, the fluid shearing system which can provide uniform, controllable and up to 60 dyn/cm2 shear stress along the bottom surface is constructed, and is easy to operate and can be personalized.

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