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Numerical modeling and experimental investigation of a two-phase sink vortex and its fluid-solid vibration characteristics

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： li peiyu*, tan dapeng*, liu duanyang *college of mechanical and energy engineering, zhejiang university, hangzhou 310027, china college of Information engineering, zhejiang university of Technology, hangzhou 310024, china

There are a lot of problems in pouring and pick equipments (PPE) which are widely applied in oil field, such as many different kinds of faults, dispersal of equipments, strict requirement for continuo

关键词： Pouring and pick equipment hand-held embedded system fault diagnosis signal analysis.

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Journal of zhejiang university-Science A(Applied Physics & engineering) 2024年第1期25卷 47-62页

作者： Zichao YIN Yesha NI lin li Tong WANG Jiafeng WU Zhe li dapeng tan college of mechanical engineering Zhejiang University of TechnologyHangzhou310014China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310058China

A sink vortex is a common physical phenomenon in continuous casting,chemical extraction,water conservancy,and other industrial processes,and often causes damage and loss in ***,the real-time monitoring of the sink vortex state is important for improving industrial production ***,its suction-extraction phenomenon and shock vibration characteristics in the course of its formation are complex mechanical dynamic factors for flow field state *** address this issue,we set up a multi-physics model using the level set method(LSM)for a free sink vortex to study the two-phase interaction ***,a fluid–solid coupling dynamic model was deduced to investigate the shock vibration characteristics and reveal the transition mechanism of the critical flow *** numerical results show that the coupling energy shock induces a pressure oscillation phenomenon,which appears to be a transient enhancement of vibration at the vortex penetration *** central part of the transient enhancement signal is a high-frequency *** on the dynamic coupling model,an experimental observation platform was established to verify the accuracy of the numerical *** water-model experiment results were accordant with the numerical *** above results provide a reference for fluid state recognition and active vortex control for industrial monitoring systems,such as those in aerospace pipe transport,hydropower generation,and microfluidic devices.

关键词： Free sink vortex Fluid-solid coupling Level set method(LSM) Multi-physics model Vibration characteristics

Incombustible solid polymer electrolytes:A critical review and perspective

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Journal of energy Chemistry 2024年第6期93卷 264-281,I0007页

作者： Kai Wu Jin tan Zhenfang liu Chenguang Bao Ao li Qi liu Baohua li college of Materials Science and engineering Hunan UniversityChangsha 413000HunanChina Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 055GuangdongChina

Since the advent of the solid-state batteries,employing solid polymer electrolytes(SPEs)to replace routine flammable liquid electrolytes is regarded to be one of the most promising solutions in pursing highenergy-density battery *** with superior thermal stability,good processability,and high mechanical modulus obtain increasing ***,SPE-based batteries are not impenetrable due to their decomposition and combustibility under extreme *** believe incorporating appropriate flame-retardant additives/solvents/fragments into SPEs can intrinsically reduce their flammability to solve the battery safety *** this review,the recent research progress of incombustible SPEs,with special emphasis on flame-retardant structural design,is ***,a brief introduction of flame-retardant mechanism,evaluation index for safety of SPEs,and a detailed overview of the latest advances on diverse-types SPEs in various battery systems are *** deep insight into thermal ru naway process,the free-standing incombustible GPEs,and the ratio nal design of pouch cell structures may be the main directions to motivate revolutionary next-generation for safety batteries.

关键词： Non-flammable electrolyte Solid polymer electrolyte High safety electrolyte Solid state electrolyte Solid state battery

energy mechanism of bolt supporting effect to fissured rock under static and dynamic loads in deep coal mines

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International Journal of Mining Science and Technology 2024年第3期34卷 371-384页

作者： Deyuan Fan Xuesheng liu Yunliang tan Xuebin li Shenglong Yang college of energy and Mining engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China National energy Group Ningxia Coal Industry Co. Ltd.Yinchuan 753001China

The stability control of fissured rock is difficult,especially under static and dynamic loads in deep coal *** this paper,the dynamic mechanical properties,strain rate evolution and energy dissipation of fissured and anchored rocks were respectively obtained by SHPB *** was found that bolt can provide supporting efficiency-improving effect for fissured rock against dynamic disturbance,and this effect increased quadratically with decrease in anchoring ***,the energy dissipation mechanism of anchored rock was obtained by slipping ***,bolt energy-absorbing mechanism by instantaneous tensile-shear deformation was expressed based on material mechanics,which was the larger the anchoring angle,the smaller the energy absorption,and the less the contribution to supporting efficiency *** this basis,the functional relationship between energy dissipation of anchored rock and energy absorption of bolt was *** the coal-gangue separation system of Longgu coal mine as an example,the optimal anchoring angle can be determined as 57.5°–67.5°.Field monitoring showed fissured rock with the optimal anchoring angle,can not only effectively control the deformation,but also fully exert the energy-absorbing and efficiency-improving effect of bolt *** study provides guidance to the stability control and supporting design for deep engineering under the same or similar conditions.

关键词： Static and dynamic loads Anchored rock energy absorption Anchoring angle engineering verification

LEAST-SQUARES METHOD-BASED FEATURE FITTING AND EXTRACTION IN REVERSE engineering

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Chinese Journal of mechanical engineering 2003年第2期16卷 163-166页

作者： Ke YinglinSun QingLu Zhencollege of mechanical andenergy engineering,zhejiang university,hangzhou 310027, china college of mechanical and energy engineering Zhejiang University Hangzhou 310027

The main purpose of reverse engineering is to convert discrete data pointsinto piecewise smooth, continuous surface models. Before carrying out model reconstruction it issignificant to extract geometric features because the quality of modeling greatly depends on therepresentation of features. Some fitting techniques of natural quadric surfaces with least-squaresmethod are described. And these techniques can be directly used to extract quadric surfaces featuresduring the process of segmentation for point cloud.

关键词： reverse engineering feature extraction least-squares method segmentationand surface fitting

Rubik's cube as in-situ programmable matter and a reconfigurable mechanical metamaterial

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Science china Technological Sciences 2024年第10期67卷 3221-3234页

作者： ZHU ShaoWei CHEN Huan YANG XiaoQiang tan li JIN Shuai CHEN liMing liu Tao tan XiaoJun WANG lianChao WANG Bing MUAMER Kadic college of Aerospace engineering Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University School of Civil Aviation Northwestern Polytechnical University National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Institut FEMTO-ST CNRS UMR 6174University Bourgogne

As part of the 4th industrial revolution, programmable mechanical metamaterials exhibit great application potential in flexible robotics, vibration control, and impact protection. However, maintaining a programmed state without sustaining the external stimulus is often challenging and leads to additional energy consumption. Inspired by Rubik's cube, we design and study an insitu programmable and distribution-reconfigurable mechanical metamaterial(IPDR-MM). A matrix model is developed to model IPDR-MMs and describe their morphological transitions. Based on this model, the reinforcement learning method is employed to find the pathways for morphological transitions. We find that IPDR-MMs have controllable stiffness across several orders of magnitude and a wide range of adjustable anisotropies through morphology transformation. Additionally, because of the independence of the directions of morphology transformation and bearing, IPDR-MMs exhibit good stability in bearing and can readily achieve high stiffness. The Rubik's cube-inspired design concept is also instructive for other deformable structures and metamaterials, and the current version of the proposal should be sufficiently illustrative to attract and broaden interdisciplinary interests.

关键词： mechanical metamaterials in-situprogrammable distribution-reconfigurable Rubik's cube controllable stiffness and anisotropy

Multi-Time-Scale Resource Allocation Based on Long-Term Contracts and Real-Time Rental Business Models for Shared energy Storage Systems

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Journal of Modern Power Systems and Clean energy 2024年第2期12卷 454-465页

作者： Yuxuan Zhuang Zhiyi li Qipeng tan Yongqi li Minhui Wan college of Electrical engineering Zhejiang UniversityHangzhouChina china Southern Power Grid Power Generation Company energy Storage Research Institute GuangzhouChina IEEE

The push for renewable energy emphasizes the need for energy storage systems(ESSs)to mitigate the unpre-dictability and variability of these sources,yet challenges such as high investment costs,sporadic utilization,and demand mismatch hinder their broader *** response,shared energy storage systems(SESSs)offer a more cohesive and efficient use of ESS,providing more accessible and cost-effective energy storage solutions to overcome these *** enhance the profitability of SESSs,this paper designs a multi-time-scale resource allocation strategy based on long-term contracts and real-time rental business *** initially construct a life cycle cost model for SESS and introduce a method to estimate the degradation costs of multiple battery groups by cycling numbers and depth of discharge within the ***,we design various long-term contracts from both capacity and energy perspectives,establishing associated models and real-time rental ***,multi-time-scale resource allocation based on the decomposition of user demand is *** analysis validates that the business model based on long-term contracts excels over models operating solely in the real-time market in economic viability and user satisfaction,effectively reducing battery degradation,and leveraging the aggregation effect for SESS can generate an additional increase of 10.7%in net revenue.

关键词： Capacity allocation long-term contracts shared energy storage system stochastic programming

EMBEDDED FLEXIBLE ASSEMBLY SYSTEM FOR CAR LATCH BASED ON LASER IDENTIFICATION

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EMBEDDED FLEXIBLE ASSEMBLY SYSTEM FOR CAR LATCH BASED ON LAS...

Kinetics analysis of volume phase transition of intelligent neutral thermo-sensitive hydrogels

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： li peiyu, tan dapeng, liN Boyu college of mechanical and energy engineering, zhejiang university, hangzhou 310027, china

Car Latch (CL) has very complex mechanical structure, requiring strict technological process, and it is difficult to realize automatic manufacturing. In allusion to above problem, a kind of embedded f

关键词： Car latch piece laser identification flexible assembly embedded system.

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Science china(Physics,Mechanics & Astronomy) 2008年第5期51卷 532-540页

作者： WANG XiaoGui1 & li YiQuan2 1 college of mechanical engineering,zhejiang university of Technology,hangzhou 310032,china 2 School of mechanical & Electronic engineering,Changchun university of Science and Technology,Changchun 130022,china college of mechanical engineering Zhejiang University of Technology Hangzhou China School of mechanical & Electronic engineering Changchun University of Science and Technology Changchun China

In this work,utilizing the first law of thermodynamics and the Flory mean-field theory,the kinetic deformation studies concerning the volume phase transition of the neutral thermo-sensitive hydrogels were performed *** hydrogel was assumed as a biphasic mixture medium in the framework of the continuum mixture *** the energy conservation of the thermodynamics system of the hydrogel,the governing equations for the kinetics of the nonlinear large deforma-tion were *** explicit analytical expressions of the effective stress tensor and the chemical potential of the fluid of the thermo-sensitive hydrogel PNIPA were also obtained from the Helmholtz free energy,which can model the steady-static volume phase transition quantitatively.

关键词： thermo-sensitive hydrogel volume phase transition effective stress energy conservation