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《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0708-0
关键词: shape−performance integrated digital twin (SPI-DT) multi-level fusion modeling (M-LFM) surrogate model telescopic boom crane data fusion
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
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
Safety and serviceability assessment for high-rise tower crane to turbulent winds
Zhi SUN, Nin HOU, Haifan XIANG
《结构与土木工程前沿(英文)》 2009年 第3卷 第1期 页码 18-24 doi: 10.1007/s11709-009-0009-2
黄耀怡,王景全,张志华,王旭
《中国工程科学》 2012年 第14卷 第7期 页码 40-45
通过对广东中远号空中翻身造船门式起重机的成功研制和应用情况的扼要介绍,着重论述了这种新装备、新技术的几项创新成果的技术特征及其重要意义,包括船段空中连续翻身技术与工艺、双柱塔式刚性支腿与观光型登机电梯设计、门架结构双主梁分层设计制造技术、随动型维修吊机和低压双卷筒电缆供电技术等。
栾秀春,韩伟实,王俊玲,杨爱光
《中国工程科学》 2010年 第12卷 第3期 页码 45-50
阐述了田湾核电站核废物库21UKT吊车自动化改造工程中高精度自动定位的技术实现,包括控制系统的硬件配置和软件配置、控制逻辑、程序结构以及变频调速函数曲线,并给出了现场检测结果。
李昌能,徐成光
《中国工程科学》 2014年 第16卷 第11期 页码 42-47
针对向家坝水电站地下厂房岩壁梁地质条件异常复杂、岩台宽度窄、承受荷载大、质量要求高和工期紧迫等特点和难点,贯彻“精细爆破”理念,通过采取合理的开挖顺序、自行设计钢管钻孔样架以确保钻孔精度、双层光面爆破和均匀微量化装药、错孔布置及预锚锁角等技术和工艺措施,对炸药爆炸能量释放与岩体破碎等进行精密控制,以确保岩壁梁的开挖成型质量,取得了优良的爆破效果:岩台光爆孔半孔率分别为Ⅱ类围岩100 %,Ⅲ类围岩99.2 %,Ⅳ类围岩90 %~97.3 %;岩壁无欠挖,平均超挖仅2.9 cm;不平整度为0~4 cm;因爆破和围岩卸荷造成的影响深度在0.2~0.7 m。
Hydro-pyrolysis of lignocellulosic biomass over alumina supported Platinum, Mo
Songbo He, Jeffrey Boom, Rolf van der Gaast, K. Seshan
《化学科学与工程前沿(英文)》 2018年 第12卷 第1期 页码 155-161 doi: 10.1007/s11705-017-1655-x
关键词: bio-oil pyrolysis hydro-deoxygenation (HDO) non-noble metal catalysts hydro-treatment
魏众,申金升,肖荣娜,张智文,石定寰
《中国工程科学》 2007年 第9卷 第8期 页码 47-51
随着贸易全球化的到来,集装箱运输业飞速发展,港口集装箱码头受到越来越多的重视。轮胎式龙门吊体积大,作业效率低,该环节 已经成为码头作业的瓶颈。提出了轮胎式龙门吊优化调度混合整数规划模型,研究了定量作业条件下的龙门吊优化调度问题,通过实际案例分 析为码头管理者提供决策支持。
月球车叶片伸缩式步行轮的力学分析和性能优化 Article
杨璐, 蔡博文, 张荣辉, 李克宁, 张子贤, 雷洁浩, 陈百超, 王荣本
《工程(英文)》 2020年 第6卷 第8期 页码 936-943 doi: 10.1016/j.eng.2020.07.009
在探月工程计划中,月球车的车轮系统是月球车总体设计系统的重要子系统之一。由于月表地形复杂,同时受限于月球车有限的空间,因此大大增加了车轮系统设计和优化工作的难度。本研究的主要目标是针对自主设计的月球车机械结构,建立一个原理型样机以对其性能进行优化。研究的主要工作包括:为应对月表复杂路况,提出了一种适配月球车正反四边形悬架的新型叶片伸缩式步行轮;以功耗最小化为目标,在保证障碍通过性的前提下,分析车轮运动过程中受力情况以实现对车轮的性能优化;最后,基于数字仿真和综合实验方法,验证了新型车轮系统在实际实验中可以达到按需伸缩叶片和节约能耗的效果。本文的研究成果为中国月球车的研究和开发提供了一种技术参考。
M.R. AKBARI,D.D. GANJI,A.R. AHMADI,Sayyid H. Hashemi KACHAPI
《机械工程前沿(英文)》 2014年 第9卷 第1期 页码 58-70 doi: 10.1007/s11465-014-0289-7
In the current paper, a simplified model of Tower Cranes has been presented in order to investigate and analyze the nonlinear differential equation governing on the presented system in three different cases by Algebraic Method (AGM). Comparisons have been made between AGM and Numerical Solution, and these results have been indicated that this approach is very efficient and easy so it can be applied for other nonlinear equations. It is citable that there are some valuable advantages in this way of solving differential equations and also the answer of various sets of complicated differential equations can be achieved in this manner which in the other methods, so far, they have not had acceptable solutions. The simplification of the solution procedure in Algebraic Method and its application for solving a wide variety of differential equations not only in Vibrations but also in different fields of study such as fluid mechanics, chemical engineering, etc. make AGM be a powerful and useful role model for researchers in order to solve complicated nonlinear differential equations.
关键词: Algebraic Method (AGM) tower crane oscillating system angular frequency
标题 作者 时间 类型 操作
M-LFM: a multi-level fusion modeling method for shape−performance integrated digital twin of complex structure
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
Safety and serviceability assessment for high-rise tower crane to turbulent winds
Zhi SUN, Nin HOU, Haifan XIANG
期刊论文
Hydro-pyrolysis of lignocellulosic biomass over alumina supported Platinum, Mo
Songbo He, Jeffrey Boom, Rolf van der Gaast, K. Seshan
期刊论文