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Manufacturing process of water-soluble salt-based ceramic cores based on vat photopolymerization

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Journal of Advanced Ceramics 2024年第5期13卷 652-665页

作者： yuzhen Zhang Wenyan Duan Yue Gu Xingyao sun Shan Li Bingshan Liu Gong {2. Key Laboratory of Space Manufacturing Technology(SMT) Technology and Engineering Center for Space UtilizationChinese Academy of SciencesBeijing 100094China University of Chinese Academy of sciences Beijing 100049China Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022China

Water-soluble salt-based ceramic cores can be recycled and have excellent high-temperature chemical *** this work,vat photopolymerization was successfully applied to water-soluble salt-based ceramic cores for the first *** powder raw materials of the printing suspension were sodium chloride and ***-precision green bodies were manufactured by optimizing suspensions and *** addition,the postprocessing method was optimized according to the microstructure and mechanical *** sintered part had a high bending strength and smooth ***,the dissolution rate and moisture resistance were compared under different dissolution and storage *** to traditional manufacturing methods,vat photopolymerization enables the production of complex structures without molds and reduces production *** technology is suitable for the rapid iteration of complex structural parts and can be applied to precision parts in aerospace,military,and other technical fields with high cost-effectiveness and sustainability.

关键词： vat photopolymerization water-soluble salt-based ceramic cores defect formation control accuracy moisture rate

L_2.DISTURBANCE ATTENUATION FOR A CLASS OF TIME-DELAY HAMILTONIAN SYSTEMS

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Journal of Systems science & Complexity 2011年第4期24卷 672-682页

作者： Weiwei sun yuzhen {2. Renming YANG Institute of Automation Qufu Normal University Qufu 273165 China. school of control {2. and engineering Shandong University Jinan 250061 China.

This paper considers the problem of L2.disturbance attenuation for a class of time-delay port-controlled Hamiltonian systems. A v-dissipative inequality is established by using a proper control law and a storage function. Then based on the Razumikhin stability theorem, a sufficient condition is proposed for the asymptotically stability of the closed-loop system. Finally, the authors investigate the case that there are time-invariant uncertainties belonging to some convex bounded polytypic domain and an L2.disturbance attenuation control law is proposed. Study of illustrative example with simulation shows that the presented method in this paper works very well in the disturbance attenuation of time-delay Hamiltonian systems.

关键词： Hamiltonian systems L2.disturbance attenuation stability time-delay.

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Adaptive Parallel Simultaneous Stabilization of Two Nonlinear Descriptor Systems via Hamiltonian Function Method

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Adaptive Parallel Simultaneous Stabilization of Two Nonlinea...

第二十九届中国控制会议

作者： sun liying1,2.wang {2.2.1.school of science,University of jinan,jinan 2.002.,P.R.china 2.school of control science and engineering,Shandong University,jinan 2.0061,P.R.china

This paper investigates the adaptive parallel simultaneous stabilization problem of two nonlinear descriptor systems via the Hamiltonian function ***,under the Hamiltonian realizations of the two nonlinear descriptor systems and an adaptive output feedback law,two nonlinear descriptor systems are equivalently transformed into two nonlinear Hamiltonian differential-algebraic systems by nonsingular transformations,and then the two systems are combined to generate an augmented dissipative Hamiltonian differential-algebraic system by using the system-augmentation *** on the dissipative system,the adaptive parallel simultaneous stabilization controller of two nonlinear descriptor systems is designed via the Hamil-tonian function method.

关键词： Adaptive Parallel Simultaneous Stabilization Nonlinear Descriptor Systems Hamiltonian Function Method.

Simultaneous stabilization of a class of nonlinear descriptor systems via Hamiltonian function method

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science in china(Series F) 2009年第11期52卷 2140-2152页

作者： sun liying {2. {2. school of control {2. and engineering Shandong University Jinan 250061 China school of science University of Jinan Jinan 250022 China

This paper studies simultaneous stabilization of a class of nonlinear descriptor systems via the Hamiltonian function method. Firstly, based on the Hamiltonian realization of the nonlinear descriptor systems and a suitable output feedback, two nonlinear descriptor systems are equivalently transformed into two nonlinear Hamiltonian differential-algebraic systems by a nonsingular transformation, and a sufficient condition for two closed-loop systems to be impulse-free is given. The two systems are then combined to generate an augmented dissipative Hamiltonian differential-algebraic system by using the system-augmentation technique, based on which a simultaneous stabilization controller and a robust simultaneous stabilization controller are designed for the two systems. Secondly, the case of more than two nonlinear descriptor systems is investigated, and two new results are proposed for the simultaneous stabilization and robust simultaneous stabilization, respectively. Finally, an illustrative example is studied by using the results proposed in this paper, and simulations show that the simultaneous stabilization controllers obtained in this paper work very well.

关键词： nonlinear descriptor systems simultaneous stabilization robust simultaneous stabilization Hamiltonian function method

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Stability of Hybrid Dissipative Hamiltonian Systems

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Stability of Hybrid Dissipative Hamiltonian Systems

第2.届中国控制会议

作者： Zhu liying, wang {2. school of control science and engineering, Shandong University, jinan 2.0061

＜正＞This paper investigates the stability of hybrid dissipative Hamiltonian systems under （arbitrary） switching laws, and proposes a number of new results for the problem. For the case that the switching law is an infinite-valued piecewise right-continuous constant function, under a realistic assumption, it is shown that hybrid dissipative Hamiltonian system is stable under arbitrary switching laws. Based on this and by using the dissipative Hamiltonian structural properties and zero-state detectibility/observability, several sufficient conditions are presented for the asymptotical stability of the hybrid dissipative Hamiltonian system. As for the case that the switching law is related only to the state, some new stability results are proposed for the hybrid dissipative Hamiltonian system. Finally, as an application, the results obtained in this paper are applied to investigate the stability of ordinary hybrid nonlinear systems, and several useful corollaries are obtained for the systems. Study on an example and numerical simulations shows that the results obtained in this paper are very practicable in analyzing the stability of explicit hybrid systems.

关键词： Hybrid Hamiltonian System Asymptotical Stability Dissipative Structure Sufficient Condition

On the Zero-State Observability/Detectability of Switched and Hybrid Hamiltonian Systems with Infinite Number of Switching Subsystems

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On the Zero-State Observability/Detectability of Switched an...

第二十七届中国控制会议

作者： Zhu liying1,wang {2.2.1.College of Mathematics,Physics and Information engineering,Zhejiang Normal University,Jinhua 32.004,P.R.china 2.school of control science and engineering,Shandong University,jinan 2.0061,P.R.china

This paper investigates the zero-state observability and detectability of switched and hybrid dissipative Hamiltonian systems with infinite number of switching subsystems,and proposes a number of new results for the ***,study of two examples shows the complexity of the relationship between the zero-state detectability/observability of a switched and hybrid Hamiltonian system and that of its ***,by fully exploiting the Hamiltonian structural properties,the（uniform） zero-state observability and detectability of switched and hybrid Hamiltonian systems with infinite number of switching subsystems are investigated,and several criterions are obtained.

关键词： Hybrid hamiltonian system Zero-state detectability/observability Criterion Sufficient condition

Study on the stability of switched dissipative Hamiltonian systems

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science in china(Series F) 2006年第5期49卷 578-591页

作者： ZHU liying wang {2. school of control {2. and engineering Shandong University Jinan 250061 China

The hybrid Hamiltonian system is a kind of important nonlinear hybrid systems. Such a system not only plays an important role in the development of hybrid control theory, but also finds many applications in practical control designs for obtaining better control performances. This paper investigates the stability of switched dissipative Hamiltonian systems under arbitrary switching paths. Under a realistic assumption, it is shown that the Hamiltonian functions of all the subsystems can be used as the multiple-Lyapunov functions for the switched dissipative Hamiltonian system. Based on this and using the dissipative Hamiltonian structural properties, this paper then proves that the P-norm of the state of switched dissipative Hamiltonian system converges to zero with the time increasing, and presents two sufficient conditions for the asymptotical stability under arbitrary switching paths. Utilizing these new results, this paper also obtains two useful corollaries for the asymptotical stability of switched nonlinear time-invariant systems. Finally, two examples are studied by using the new results proposed in this paper, and some numerical simulations are carried out to support our new results.

关键词： switched Hamiltonian system multiple-Lyapunov functions asymptotical stability dissipative structure sufficient condition.

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Stability and control of a Class of Constrained Hamiltonian Systems

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Stability and Control of a Class of Constrained Hamiltonian ...

第二十六届中国控制会议

作者： Cai Xin,wang yuzhen ,{2. Weiwei {2. of control science and engineering,Shandong University,jinan 2.0061,P.R.china

This paper investigates the stability and control design of a class of constrained Hamiltonian systems,and presents some results for the ***,we investigate the stability of constrained Hamiltonian *** on the structural properties of the Hamiltonian systems,several useful stability criteria are ***,we discuss feedback stabilization of the constrained Hamiltonian ***,we study the H∞ control of constrained Hamiltonian systems,and design an effective control law.

关键词： Constrained Hamiltonian system Stability Feedback Stabilization H∞ control

Modification Design of High-precision Above Ground Marking System

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Modification Design of High-precision Above Ground Marking S...

2.10 Chinese control and Decision Conference

作者： liying sun~(1,2.,Yibo Li~1,Gang Du~1,Weikui {2.~1,Yuankai Zhang~3 1.State Key Lab.of Precision Measurement Technology and Instrument Tianjin University Tianjin,300072.{2. 2.Department of Energy and Mechanics engineering,Tianjin Institute of Urban Construction,Tianjin,300384,{2. 3.Institute of Acoustics,Chinese Academy of sciences,Beijing 100190,{2.

＜正＞Above ground marking system is one of the three main components of Magnetic Flux Leakage Detector, which is widely used in safety and integrity assessment of long-range transmission *** analyzing the advantages and disadvantages of three types of former above ground marking systems,a high-precision above ground marking system with smart appearance,intelligent communication and low cost is designed to eliminate the accumulated errors caused by mechanical construction,turning or slippage of the miles round of the magnetic Flux Leakage Detector. Hardware design of the new above ground system,including above ground marker and master clock system,is investigated in detail in this paper and reliable experiments and traction tests were performed to test the stability and dependability of the system.

关键词： Above Ground Marker Master clock hardware design Magnetic Flux Leakage Detector