检索结果-内蒙古大学图书馆

作者： Lijuan Li Zhenyu Liu Hui Li Xianhui Ye Honglei Ai National Key Laboratory of Science and Technology on Reactor System Design Technology

reactor coolant system is connected with auxiliary pipes, surge pipes and steam pipes. In order to facilitate the dynamic analysis of reactor coolant system, it is necessary to decouple the pipes connected with the reactor coolant system. Although some international standards stipulating requirements for the decoupling of subsystems from the main system, in order to further explore the influence of decoupling steam pipes, the seismic response of reactor coolant system with or without steam pipes is simulated by using ANSYS program. Firstly, the modal analysis of reactor coolant system is carried out to analysis the influence of steam pipes on the resonant frequency of reactor system. Then, the standardized seismic dynamic analysis of reactor system with or without steam pipes is carried out. The nozzle load(inlet and outlet nozzle load of main device, such as reactor pressure vessel, steam generator, pump) and support load(of main device such as reactor pressure vessel, steam generator, pump) are output and compared. According to nozzle load and support load, it can be seen that the steam pipes have little influence on the seismic analysis of reactor coolant system, i.e. steam pipes can be decoupled in the seismic analysis of reactor coolant system.

关键词： reactor coolant system dynamic analysis seismic response decouple steam pipes

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Stability Analysis of Hybrid-Driven Underwater Glider

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China Ocean Engineering 2017年第5期31卷 528-538页

作者： NIU Wen-dong WANG Shu-xin WANG Yan-hui SONG Yang ZHU Ya-qiang Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education School of Mechanical EngineeringTianjin University The Joint Laboratory of Ocean Observing and Detecting Qingdao National Laboratory for Marine Science and Technology

Hybrid-driven underwater glider is a new type of tmmanned underwater vehicle, which combines the advantages of autonomous underwater vehicles and traditional underwater gliders. The autonomous underwater vehicles have good maneuverability and can travel with a high speed, while the traditional underwater gliders are highlighted by low power consumption, long voyage, long endurance and good stealth characteristics. The hybrid-driven underwater gliders can realize variable motion profiles by their own buoyancy-driven and propeller propulsion systems. Stability of the mechanical system determines the performance of the system. In this paper, the Petrel-II hybrid-driven underwater glider developed by Tianjin University is selected as the research object and the stability of hybrid-driven underwater glider unitedly controlled by buoyancy and propeller has been targeted and evidenced. The dimensionless equations of the hybrid-driven underwater glider are obtained when the propeller is working. Then, the steady speed and steady glide path angle under steady-state motion have also been achieved. The steady-state operating conditions can be calculated when the hybrid-driven underwater glider reaches the desired steady-state motion. And the steady- state operating conditions are relatively conservative at the lower bound of the velocity range compared with the range of the velocity derived from the method of the composite Lyapunov function. By calculating the hydrodynamic coefficients of the Petrel-II hybrid-driven underwater glider, the simulation analysis has been conducted. In addition, the results of the field trials conducted in the South China Sea and the Danjiangkou Reservoir of China have been presented to illustrate the validity of the analysis and *** to show the feasibility of the method of the composite Lyapunov function which verifies the stability of the Petrel-II hybrid-driven underwater glider.

关键词： hybrid-driven underwater glider stability analysis numerical simulation field trials

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Failure Analysis of Power Electronic Devices and Their Applications under Extreme Conditions

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Chinese Journal of Electrical Engineering 2016年第1期2卷 91-100页

作者： Yifei Luo Fei Xiao Bo Wang Binli Liu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan430033China

Power electronic devices are the core components of modern power converters,not only for normal applications,but also for extreme *** design of power electronic devices require large redundancies for *** results in huge volume and weight for a large-capacity power converter,especially for some extreme ***,to optimize the power density,the reliability of power devices needs to be investigated first in order to obtain the accurate operational margin of a power *** much research on device failure analysis has been reported,there still lacks efficient failure evaluation *** paper first summarizes the current failure ***,a three-step failure analysis method of power electronic devices is proposed as:failure information collection,failure identification and mechanism,and failure *** physics-based modeling method is emphasized since it has a strong relationship with the device *** that,power electronic device applications under extreme conditions are introduced and a design method of device under extreme conditions is proposed based on the thermal equilibrium ***,the challenges and prospects to improve the power device reliability under extreme conditions are concluded.

关键词： Power electronic device failure mechanism failure evaluation physics-based modeling extreme conditions thermal equilibrium

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Beyond biochemical patterning: How mechanical bistability governs robust organoid morphogenesis

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Mechanobiology in Medicine 2025年第2期3卷

作者： Qigan Gao Yuehua Yang Haoxiang Yang Hongyuan Jiang CAS Key Laboratory of Mechanical Behavior and Design of Materials CAS Center for Excellence in Complex System Mechanics Department of Modern Mechanics University of Science and Technology of China Hefei Anhui 230026 China

Understanding the regulatory mechanisms of intestinal organoid morphogenesis remains a fundamental challenge in organoid biology. Emerging evidence highlights mechanical bistability as a critical regulator, mediated by dynamic lumen-actomyosin feedback. The recently developed 3D vertex model demonstrates that crypt curvature modulates actomyosin localization via mechanosensitive pathways, creating two stable morphological states—bulged or budded—depending on mechanical history. This model advances beyond static vertex models by incorporating epithelial thickness variations and lumen pressure effects, explaining previously unresolved phenomena like irreversible crypt budding and snap-through transitions. The findings establish a new framework for understanding mechanical decision-making in epithelial tissues, with implications for organoid engineering and developmental biology.

关键词： Mechanical bistability Intestinal organoids Vertex model Morphogenesis Epithelial mechanics

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Research on in-plane fluid-elastic instability of heat transfer tube in steam generator 48

Research on in-plane fluid-elastic instability of heat trans...

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48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID

作者： Qi, Huan-Huan Jiang, Nai-Bin Huang, Xuan Feng, Zhi-Peng Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China 328 Changshun Avenue Chengdu China

ISBN: (纸本)9788487985317

Due to a small gap between the anti-vibration bars (AVBs) and the heat transfer tubes, and according to the position of AVBs and the number of continuous failures of the in-plane support, the in-plane restraint failure analysis of AVB is divided into 13 cases. The influence of the restraint failure on the in-plane mode of the heat transfer tube under different cases is analysed. The mode damping ratio was calculated by performing a weighted average method based on the mode shape function, and then the effects of different restraints by AVBs on fluid-elastic instability of steam generator tubes are studied. The analysis results show that with the increase of the continuous failure position of the in-plane support, the first-order modal frequency in the elbow zone decreases continuously, and the mode shape appearing in the elbow zone becomes more obvious. The first-order mode in the elbow zone is not necessarily the mode in which the largest fluidelastic instability ratio occurs. The vibration mode with the largest ratio of the fluid-elastic instability appears almost in the elbow zone. With the increase of the continuous failure position of the in-plane support, the fluid-elastic instability ratio increases continuously. When three or more continuous AVBs fail in-plane, fluidelastic instability will occur. © INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.

关键词： Tubes (components)

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A Matching Based Escape Routing Algorithm with Variable design Rules and Constraints 23

A Matching Based Escape Routing Algorithm with Variable Desi...

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Proceedings of the 60th Annual ACM/IEEE design Automation Conference

作者： Qinghai Liu Disi Lin Chuandong Chen Huan He Jianli Chen Yao-Wen Chang Center for Discrete Mathematics Fuzhou University Fuzhou China and Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian China Department of Microelectronics Fuzhou University Fuzhou China Hangzhou Huawei Enterprises Telecommunication Technologies Co. Ltd Hangzhou China State Key Lab of ASIC & System Fudan University Shanghai China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan and Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9798350323481

Escape routing is a critical problem in PCB routing, and its quality greatly affects the PCB design cost. Unlike the traditional escape routing that works mainly for the BGA package with unique line width and space, this paper presents a high-performance escape routing algorithm to handle problems with variable design rules and manual constraints, including variable line widths/spaces, the neck mode of wires, and the pad entry for differential pairs. We first propose a novel obstacle-avoiding method to project pins to the boundary and construct a channel projection graph. We then construct a bi-projection graph and propose a matching-based hierarchical sequencing algorithm to consider manual constraints. We perform global routing for each pin/differential pair by congestion-avoiding path initialization and rip-up and reroute path optimization. Finally, we complete detailed routing in every face, ensuring the wire angle and pad entry constraints. Experimental results show that our algorithm can achieve 100% routability without any design rule violation for all given industrial PCB instances, while two state-of-the-art routers cannot complete routing.

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The Study of Limit Load and Plastic Collapse Load Under Combined Loads

The Study of Limit Load and Plastic Collapse Load Under Comb...

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作者： Zhang, Ying Zheng, Bin Zhang, Liping Liu, Zhenyu Du, Juan State Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu610213 China

In the process of mechanical analysis for equipment and pipe of reactor coolant system (RCS), due to the severe load condition, the stress analysis cannot satisfy the evaluation criteria at times, the limit analysis and plastic analysis is necessary. This paper focus on the limit load and the plastic collapse load of the straight pipe and three-way pipe of reactor coolant system (such as the nozzle of main equipment and the pipe of main system) under combined loads, the analytical method and the finite element (FE) method are adopted in this paper. Get the limit load curve and the plastic collapse load curve of straight pipe and three-way pipe under combined loads, the effect of load history and structure size is analyzed. Tangent intersection criterion (TI) and Plastic work-tangent criterion (PWT) are adopted to study the plastic collapse load curve of straight pipe under combined load of pressure and bending moment. Get the theoretical equation of the limit load and plastic collapse curve of straight pipe under combined loads;get the theoretical equation of the limit load surface of straight pipe under combined load of pressure, bending moment and torque. The effect of many factors is analyzed on three-way pipe. © Springer Nature Switzerland AG 2020.

关键词： Stress analysis

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Experimental Research on Uniaxial Tensile Behavior and Cyclic Deformation Behavior of TA17

Experimental Research on Uniaxial Tensile Behavior and Cycli...

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作者： Du, Juan Shao, Xuejiao Kuang, Linyuan Lu, Yuechuan Yu, Minda Lu, Jiang State Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu610213 China

Titanium alloys are widely used in various fields for its high strength, good corrosion resistance and high heat resistance. Many countries in the world have recognized the importance of titanium alloy materials, and have developed and applied them in practice. In order to accurately describe uniaxial tensile behavior and ratcheting behavior of material, a series of experiments of TA17 were conducted at room temperature and 350 ℃, including the uniaxial tensile experiments of TA17 with different processing techniques, the strain controlled cyclic experiments and the stress controlled cyclic experiments. The uniaxial tensile curves of materials with different processing techniques are discussed. The effects of different strain amplitudes of cyclic straining were analyzed. The effects of different combinations of mean stress and stress amplitude were analyzed. Finally, the uniaxial stress and strain curves with different processing techniques, cyclic stress and strain curves under different strain amplitudes and stress amplitude were obtained. The results show that the stress and strain curves of longitudinal plates and forgings are the lowest, while the stress and strain curves of transverse plates and bars are the highest. TA17 exhibited significant cyclic stability under different strain amplitudes and has obvious ratcheting behavior under asymmetric stress control. The obtained conclusions are helpful to improve the mechanical properties of TA17 and establish the cyclic constitutive model in the following work. © Springer Nature Switzerland AG 2020.

关键词： Corrosion resistance

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Microstructure and impact toughness of 16MND5 reactor pressure vessel steel manufactured by electrical additive manufacturing

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Journal of Iron and Steel Research International 2020年第8期27卷 992-1004页

作者： Xi-kou He Chang-sheng Xie Li-jun Xiao Ying Luo Di Lu Zheng-dong Liu Xi-tao Wang Institute for Special Steels China Iron and Steel Research InstituteBeijing 100081China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610041SichuanChina Southern Additive Science and Technology Co. Ltd.Foshan 528225GuangdongChina

Electrical additive manufacturing can improve manufacturing efficiency and reduce the cost of 16MND5 reactor pres-sure vessel steel. Impact tests were conducted to compare the impact toughness of 16MND5 steels manufactured by the electrical additive manufacturing and conventional forging, respectively. It is found that the impact toughness of electrical additive manufacturing specimen was slightly higher than that of conventional forging specimen. The characterizations of microstructure show that there were large ferrites and carbides in electrical additive manufacturing specimen. The fracture mechanisms of electrical additive manufacturing specimen were that microvoids or microcracks were prone to nucleate at the large ferrite/bainite interface and large carbide/bainitic ferrite interface, where the stress concentration was high. In addi-tion, the block size and high-angle grain boundaries played a vital role in hindering crack propagation of electrical additive manufacturing specimen, helping to improve the impact energy and leading to a low ductile–brittle transition temperature. The results suggest that the electrical additive manufacturing technology was an effective method to enhance the impact toughness of 16MND5 steel.

关键词： Electrical additive manufacturing 16MND5 steel Impact toughness Fracture High-angle grain boundary

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Molecular transport under extreme confinement

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science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 1-10页

作者： FengChao Wang JianHao Qian JingCun Fan JinChuan Li HengYu Xu HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Mass transport through the nanoporous medium is ubiquitous in nature and *** the macroscale transport phenomena which have been well understood by the theory of continuum mechanics,the relevant physics and mechanics on the nanoscale transport still remain *** developments in fabrication of slit-like nanocapillaries with precise dimensions and atomically smooth surfaces have promoted the fundamental research on the molecular transport under extreme *** this review,we summarized the contemporary progress in the study of confined molecular transport of water,ions and gases,based on both experiments and molecular dynamics *** liquid exhibits a pronounced layered structure that extends over several intermolecular distances from the solid surface,which has a substantial influence on static properties and transport behaviors under *** studies have also shown that those molecular details could provide some new understanding on the century-old classical theory in this field.

关键词： confined mass transport nanocapillary solid-liquid interface confinement effect

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