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Numerical simulation of multi-body floating piers to investigate pontoon stability

Mostafa Shahrabi, Khosrow Bargi

《结构与土木工程前沿（英文）》 2013年 第7卷 第3期   页码 325-331 doi: 10.1007/s11709-013-0209-7

摘要： The objective of this study is to develop a procedure to analyze the motions of a floating pier comprised of several pontoons that are modeled as rigid bodies and connected to each other by flexible and rigid connectors. Recently, the use offloating piers has increased because of their advantages, such as faster and higher-quality construction, seismic force isolation for a full-scale mooring system, low dependence on local soil conditions and tides, ability to relocate or reconfigure the pier modules during the operation period and 75-100 years of repair-free service. A floating pier consists of a pier, access bridge, mooring system and fender system, each of which comes in many variations to suit different usages and construction considerations. The typical loads used in the design of these piers are dead loads, live loads, mooring loads, fender loads and environmental loads induced by wind, currents and waves. For numerical simulation, three types of piers are used: passenger piers, light-cargo piers and semi-heavy-cargo piers. The selected piers consist of several large pontoons joined by pivots and have a pile-based mooring system. These piers are modeled by SAP2000software as two-dimensional frames that are linked together. As the first step, each type of pier is subjected to loading, and its general behavior is assessed. According to this behavior, the major load combinations are described for the design of piers and analyzed to determine the behavior of the modules. Lastly, according to the analysis results and the safe use and stability considerations, such as the maximum draft and longitudinal gradient, the dimensions of each module in each pier type are presented.

关键词： coastal structures     numerical simulation     floating pier     rigid pontoons     stability    

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超长筒体与滚圈三维多体接触体系的力学特征

梁小玲,肖友刚,李学军

《中国工程科学》 2005年 第7卷 第12期   页码 41-44

摘要：

针对筒体、滚圈结构重复性强的特点，基于多重子结构技术，建立了超长筒体与滚圈三维多体接触模型；应用参数二次规划法，对中铝公司河南分公司2号窑筒体与滚圈的多体接触模型进行了有限元数值计算，得出结论：a.从0°到360°，档位段筒壳的等效应力突变5次，筒节段筒壳的等效应力突变4次；b.档位段筒壳强度较弱，筒节段筒壳强度有一定富余；c.2，3档位段筒壳是筒壳强度的薄弱环节。

关键词： 筒体     多体接触     多重子结构     力学特征    

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Application of coupled multi-body dynamics–discrete element method for optimization of particle damper

Danhui DAN, Qianqing WANG, Jiongxin GONG

《结构与土木工程前沿（英文）》 2021年 第15卷 第1期   页码 244-252 doi: 10.1007/s11709-021-0696-x

摘要： With the application of the particle damping technology to cable vibration attenuation, the rootless cable damper overcomes the limit in installation height of existing dampers. Damping is achieved through energy dissipation by collisions and friction. In this paper, a coupled multi-body dynamics–discrete element method is proposed to simulate the damping of the damper–cable system under a harmonic excitation. The analyses are done by combining the discrete element method in EDEM and multi-body dynamics in ADAMS. The simulation results demonstrate the damping efficiency of rootless particle damper under different excitations and reveal the influence of the design parameters on its performance, including the filling ratio, particle size, coefficient of restitution, and coefficient of friction.

关键词： granular material     vibration control     discrete element method     particle damper     cable vibration    

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Design and simulation of a cable-pulley-based transmission for artificial ankle joints

Huaxin LIU,Marco CECCARELLI,Qiang HUANG

《机械工程前沿（英文）》 2016年 第11卷 第2期   页码 170-183 doi: 10.1007/s11465-016-0383-0

摘要：

In this paper, a mechanical transmission based on cable pulley is proposed for human-like actuation in the artificial ankle joints of human-scale. The anatomy articular characteristics of the human ankle is discussed for proper biomimetic inspiration in designing an accurate, efficient, and robust motion control of artificial ankle joint devices. The design procedure is presented through the inclusion of conceptual considerations and design details for an interactive solution of the transmission system. A mechanical design is elaborated for the ankle joint angular with pitch motion. A multi-body dynamic simulation model is elaborated accordingly and evaluated numerically in the ADAMS environment. Results of the numerical simulations are discussed to evaluate the dynamic performance of the proposed design solution and to investigate the feasibility of the proposed design in future applications for humanoid robots.

关键词： biomimetic designs     ankle joints     cable-pulley transmissions     multi-body dynamic simulation     numerical characterization    

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Prevention and treatment of pancreatic fistula after pancreatic body and tail resection: current status

Li Jiang, Deng Ning, Xiaoping Chen

《医学前沿（英文）》 2020年 第14卷 第3期   页码 251-261 doi: 10.1007/s11684-019-0727-3

摘要： Postoperative pancreatic fistula (POPF) is the most common and critical complication after pancreatic body and tail resection. How to effectively reduce the occurrence of pancreatic fistula and conduct timely treatment thereafter is an urgent clinical issue to be solved. Recent research standardized the definition of pancreatic fistula and stressed the correlation between POPF classification and patient prognosis. According to the literature, identification of the risk factors for pancreatic fistula contributed to lowering the rate of the complication. Appropriate management of the pancreatic stump and perioperative treatment are of great significance to reduce the rate of POPF in clinical practice. After the occurrence of POPF, the treatment of choice should be determined according to the classification of the pancreatic fistula. However, despite the progress and promising treatment approaches, POPF remains to be a clinical issue that warrants further studies in the future.

关键词： pancreatic fistula     pancreatic body and tail resection     distal pancreatectomy    

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Laboratory experiment on using non-floating body to generate electrical energy from water waves

Arunachalam AMARKARTHIK, Srinivasan CHANDRASEKARAN, Karuppan SIVAKUMAR, Harender SINHMAR

《能源前沿（英文）》 2012年 第6卷 第4期   页码 361-365 doi: 10.1007/s11708-012-0210-1

摘要： This paper describes an innovative method of using a non-buoyant body to harness ocean waves. All the point absorbers are buoyant in nature and move up due to buoyancy and come down because of gravity. The point absorbers are designed to move along the waves to make the device efficient. These devices face excessive stress during the rough weather on account of the extreme motion of waves and cause the total device failure. The present study shows that using a non-buoyant body for conventional point absorber principle is much efficient and safer than any other device proposed till today. A small scale wave energy converter with non-buoyant body was designed, fabricated and tested in small scale wave maker. An electrical generator was coupled with the device to generate electrical energy from harnessed waves. The generator was electrically loaded and the generated power was measured. It was found from the experiments that the proposed device showed a significant improvement in electricity generation and safety during extreme conditions. In addition to the electricity generation, the characteristics of the device were also studied by using various wave and device parameters.

关键词： ocean wave energy     point absorbers     heaving body     non-floating object     heave response ratio     electrical energy generation    

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Lightweight design of an electric bus body structure with analytical target cascading

《机械工程前沿（英文）》 2023年 第18卷 第1期 doi: 10.1007/s11465-022-0718-y

摘要： Lightweight designs of new-energy vehicles can reduce energy consumption, thereby improving driving mileage. In this study, a lightweight design of a newly developed multi-material electric bus body structure is examined in combination with analytical target cascading (ATC). By proposing an ATC-based two-level optimization strategy, the original lightweight design problem is decomposed into the system level and three subsystem levels. The system-level optimization model is related to mass minimization with all the structural modal frequency constraints, while each subsystem-level optimization model is related to the sub-structural performance objective with sub-structure mass constraints. To enhance the interaction between two-level systems, each subsystem-level objective is reformulated as a penalty-based function coordinated with the system-level objective. To guarantee the accuracy of the model-based analysis, a finite element model is validated through experimental modal test. A sequential quadratic programming algorithm is used to address the defined optimization problem for effective convergence. Compared with the initial design, the total mass is reduced by 49 kg, and the torsional stiffness is increased by 17.5%. In addition, the obtained design is also validated through strength analysis.

关键词： electric vehicle     body in white (BIW)     lightweight     analytical target cascading (ATC)    

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Yesterday, Today and Future of the Engineering Management Body of Knowledge

Hiral Shah,Walter Nowocin

《工程管理前沿（英文）》 2015年 第2卷 第1期   页码 60-63 doi: 10.15302/J-FEM-2015009

摘要： Young engineers are often promoted to leadership roles such as a team leader or a manager within 3 to 6 years of graduating from an undergraduate degree in a technical area. To be competent and successful in their leadership role engineers need to update their engineering management knowledge and learn new skills. The purpose of engineering management body of knowledge (EMBOK) is to delineate the knowledge, skills, and competency areas that are applicable to the engineering management discipline. It basically answers the question, “What does it take to be an effective engineering manager?” The EMBOK is based on a validated study and can be used for curriculum development, certification exams, and professional development programs. This paper describes the 11 domains that are included in the EMBOK and discuss the future publication of the EMBOK Guide. American Society for Engineering Management (ASEM) offers two certification exams based on the EMBOK, Associate Engineering Manager (AEM) and Professional Engineering Manager (PEM).These certification exams can help an individual in the engineering management profession to show that they have kept up in the field and possess the necessary skills and competency to practice in the discipline. A detailed description of this certification program is included in this paper. The future of EMBOK and the certification program is also discussed.

关键词： body of knowledge     engineering management     certification exam     engineering manager     competency areas    

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A dynamic model of mobile concrete pump boom based on discrete time transfer matrix method

Wu REN, Yunxin WU, Zhaowei ZHANG

《机械工程前沿（英文）》 2013年 第8卷 第4期   页码 360-366 doi: 10.1007/s11465-013-0280-8

摘要：

Mobile concrete pump boom is typical multi-body large-scale motion manipulator. Due to posture constantly change in working process, kinematic rule and dynamic characteristic are difficult to solve. A dynamics model of a mobile concrete pump boom is established based on discrete time transfer matrix method (DTTMM). The boom system is divided into sub-structure A and sub-structure B. Sub-structure A is composed by the 1st boom and hydraulic actuator as well as the support. And sub-structure B is consists of the other three booms and corresponding hydraulic actuators. In the model, the booms and links are regarded as rigid elements and the hydraulic cylinders are equivalent to spring-damper. The booms are driven by the controllable hydraulic actuators. The overall dynamic equation and transfer matrix of the model can be assembled by sub-structures A and B. To get a precise result, step size and integration parameters are studied then. Next the tip displacement is calculated and compared with the result of ADAMS software. The displacement and rotation angle curves of the proposed method fit well with the ADAMS model. Besides it is convenient in modeling and saves time. So it is suitable for mobile concrete pump boom real-time monitoring and dynamic analysis. All of these provide reference to boom optimize and engineering application of such mechanisms.

关键词： multi-body     mobile concrete pump boom     discrete time transfer matrix method (DTTMM)     kinematic     dynamic     tip displacement    

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创建新医学的思考

马蔼乃,赵少奎

《中国工程科学》 2007年 第9卷 第10期   页码 19-23

摘要：

西医以实证科学为基础，以分解、还原为主要方法，分工越来越精细，获得了许多医学上的成就，也治愈了许多疾病，但是强调治病，对人的因素重视不够，在维护整个人体健康方面遇到了某些困惑。 中医把人看成“天、地、人”三位一体的整体，从辨证恒动的观点出发，以实践为基础，实施综合、整体治疗，也获得许多医学上的成就，治愈了许多疾病，但是主要凭感觉，取象比类等方法诊治病人，缺乏实证科学的基础。 半个多世纪以来，提倡中西医结合，有一定成效。在钱学森系统科学思想的指导下，依照“突破还原论，发展整体论，达到两者辩证统一的系统论”的哲学理念，提出了中西医的结合点——人体生态系统。人体生态系统是以人体系统为中心与人体之外的环境构成一个整体的复杂系统，针对“人”是一个开放的复杂巨系统，运用综合集成创新的思路，提出了创建新医学——人体生态医学的构想。

关键词： 复杂性科学     开放的复杂巨系统     人体生态系统     人体信息系统     人体生态医学    

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Sodium butyrate activates HMGCS2 to promote ketone body production through SIRT5-mediated desuccinylation

《医学前沿（英文）》 2023年 第17卷 第2期   页码 339-351 doi: 10.1007/s11684-022-0943-0

摘要： Ketone bodies have beneficial metabolic activities, and the induction of plasma ketone bodies is a health promotion strategy. Dietary supplementation of sodium butyrate (SB) is an effective approach in the induction of plasma ketone bodies. However, the cellular and molecular mechanisms are unknown. In this study, SB was found to enhance the catalytic activity of 3-hydroxy-3-methylglutaryl-CoA synthase 2 (HMGCS2), a rate-limiting enzyme in ketogenesis, to promote ketone body production in hepatocytes. SB administrated by gavage or intraperitoneal injection significantly induced blood β-hydroxybutyrate (BHB) in mice. BHB production was induced in the primary hepatocytes by SB. Protein succinylation was altered by SB in the liver tissues with down-regulation in 58 proteins and up-regulation in 26 proteins in the proteomics analysis. However, the alteration was mostly observed in mitochondrial proteins with 41% down- and 65% up-regulation, respectively. Succinylation status of HMGCS2 protein was altered by a reduction at two sites (K221 and K358) without a change in the protein level. The SB effect was significantly reduced by a SIRT5 inhibitor and in Sirt5-KO mice. The data suggests that SB activated HMGCS2 through SIRT5-mediated desuccinylation for ketone body production by the liver. The effect was not associated with an elevation in NAD+/NADH ratio according to our metabolomics analysis. The data provide a novel molecular mechanism for SB activity in the induction of ketone body production.

关键词： sodium butyrate     succinylation     HMGCS2     ketogenesis     SIRT5    

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Water quality monitoring in a slightly-polluted inland water body through remote sensing - Case study

HE Weiqi, LIU Xuehua, CHEN Jining, CHEN Shan

《环境科学与工程前沿（英文）》 2008年 第2卷 第2期   页码 163-171 doi: 10.1007/s11783-008-0027-7

摘要： This study focused on the water quality of the Guanting Reservoir, a possible auxiliary drinking water source for Beijing. Through a remote sensing (RS) approach and using Landsat 5 Thematic Mapper (TM) data, water quality retrieval models were established and analyzed for eight common water quality variables, including algae content, turbidity, and concentrations of chemical oxygen demand, total nitrogen, ammonia nitrogen, nitrate nitrogen, total phosphorus, and dissolved phosphorus. The results show that there exists a statistically significant correlation between each water quality variable and remote sensing data in a slightly-polluted inland water body with fairly weak spectral radiation. With an appropriate method of sampling pixel digital numbers and multiple regression algorithms, retrieval of the algae content, turbidity, and nitrate nitrogen concentration was achieved within 10% mean relative error, concentrations of total nitrogen and dissolved phosphorus within 20%, and concentrations of ammonia nitrogen and total phosphorus within 30%. On the other hand, no effective retrieval method for chemical oxygen demand was found. These accuracies were acceptable for the practical application of routine monitoring and early warning on water quality safety with the support of precise traditional monitoring. The results show that performing the most traditional routine monitoring of water quality by RS in relatively clean inland water bodies is possible and effective.
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三维GIS中地层多比例尖灭自动建模技术

董志

《中国工程科学》 2010年 第12卷 第2期   页码 76-82

摘要：

利用地质勘察数据导入到三维系统中，运用各种三维空间构模方法，自动进行地层推理与连接，生成三维地层模型。以多数据源自动生成模型，可以方便地使地学领域中的地质工作者从繁重的地质信息获取和地质解释手工劳动中解放出来，提高了三维地层建模的速度和构建质量。

关键词： 地质三维模型     虚拟钻孔     多比例尖灭     自动建模     三角形自分解    

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Advancement of the Engineering Management Body of Knowledge

David A. Wyrick,Paul Kauffmann,Libby Schott,John V. Farr

《工程管理前沿（英文）》 2015年 第2卷 第1期   页码 93-98 doi: 10.15302/J-FEM-2015008

摘要： Trade around the world has become globally interconnected. Engineers play an integral role in designing products, managing supply chains, providing services, and increasing the quality of life for people and promoting sustainable development around the globe. Engineering managers make decisions every day that will have profound impacts on international suppliers, customers, partners, consumers, and the environment. Traditional education for engineering students focuses on the technical aspects and scientific principles. Education in some countries may focus exclusively on mathematics, science, and engineering topics. The North American model incorporates a general education component into the undergraduate program of study to give students a broad appreciation of ideas ranging from art to literature to the social sciences. This paper will investigate how undergraduate engineering management programs educate their students to be able to work in international settings or in the global workplace. This initial study will concentrate on the engineering management programs that are accredited by ABET, an international organization that accredits technical programs in higher education. ABET has accredited over 3,400 programs in applied science, computing, engineering, and engineering technology in 28 countries. This study will access publicly available information to determine the breadth and depth of education related to helping prepare engineering management students to work in a global marketplace. These data will be collected from the programs accredited by ABET using the “Engineering Management” program criteria, due to the public availability of this information. Initial findings will be presented, and may serve to identify opportunities for cooperation and further work.

关键词： engineers     engineering management     knowledge     education     programs    

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Investigation of vortical flows over oscillating body using fast Lagrangian vortex method

Baoshan ZHU ,

《能源前沿（英文）》 2009年 第3卷 第3期   页码 297-306 doi: 10.1007/s11708-009-0010-4

摘要： A computational method facilitating long-time and high-resolution unsteady vortical flows is developed with the advantages of the discrete vortex methods. Both the velocity and pressure distribution of the flow field are calculated by integral formulations in combination with a fast summation algorithm. The vorticity field is described by Lagrangian representation, which is well suited to the moving boundary. Viscosity diffusion of the vorticity is considered with the core spreading model corrected by an adaptive splitting and merging algorithm. The effectiveness of the present method is examined by comparing the numerical results of unsteady separated flows which pass a cylinder and a thin cambered blade undergoing rotational oscillations with available experimental results. Interesting results about vortex shedding patterns and lock-in characteristics are provided for the thin cambered blade.

关键词： unsteady vortical flows     fast vortex method     vortex shedding     rotational oscillation     thin cambered blade    

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标题 作者 时间 类型 操作

Numerical simulation of multi-body floating piers to investigate pontoon stability

Mostafa Shahrabi, Khosrow Bargi

期刊论文

超长筒体与滚圈三维多体接触体系的力学特征

梁小玲,肖友刚,李学军

期刊论文

Application of coupled multi-body dynamics–discrete element method for optimization of particle damper

Danhui DAN, Qianqing WANG, Jiongxin GONG

期刊论文

Design and simulation of a cable-pulley-based transmission for artificial ankle joints

Huaxin LIU,Marco CECCARELLI,Qiang HUANG

期刊论文

Prevention and treatment of pancreatic fistula after pancreatic body and tail resection: current status

Li Jiang, Deng Ning, Xiaoping Chen

期刊论文

Laboratory experiment on using non-floating body to generate electrical energy from water waves

Arunachalam AMARKARTHIK, Srinivasan CHANDRASEKARAN, Karuppan SIVAKUMAR, Harender SINHMAR

期刊论文

Lightweight design of an electric bus body structure with analytical target cascading

期刊论文

Yesterday, Today and Future of the Engineering Management Body of Knowledge

Hiral Shah,Walter Nowocin

期刊论文

A dynamic model of mobile concrete pump boom based on discrete time transfer matrix method

Wu REN, Yunxin WU, Zhaowei ZHANG

期刊论文

创建新医学的思考

马蔼乃,赵少奎

期刊论文

Sodium butyrate activates HMGCS2 to promote ketone body production through SIRT5-mediated desuccinylation

期刊论文

Water quality monitoring in a slightly-polluted inland water body through remote sensing - Case study

HE Weiqi, LIU Xuehua, CHEN Jining, CHEN Shan

期刊论文

三维GIS中地层多比例尖灭自动建模技术

董志

期刊论文

Advancement of the Engineering Management Body of Knowledge

David A. Wyrick,Paul Kauffmann,Libby Schott,John V. Farr

期刊论文

Investigation of vortical flows over oscillating body using fast Lagrangian vortex method

Baoshan ZHU ,

期刊论文