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700t单门式桅杆横梁吊装设备有限元计算 被引量:2
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作者 唐委校 王存廷 李红 《起重运输机械》 2000年第5期12-14,共3页
用有限元法对石油化工生产中 70 0t级反应器吊装用新型单门式桅杆横梁吊装设备进行强度、刚度计算分析 ,并依据计算结论 ,对吊装设备的结构进行加强和优化。计算结果及实践证明 ,该新型单门式桅杆横梁吊装设备的结构设计合理 ,力学性能... 用有限元法对石油化工生产中 70 0t级反应器吊装用新型单门式桅杆横梁吊装设备进行强度、刚度计算分析 ,并依据计算结论 ,对吊装设备的结构进行加强和优化。计算结果及实践证明 ,该新型单门式桅杆横梁吊装设备的结构设计合理 ,力学性能好 ,强度。 展开更多
关键词 桅杆 吊装设备 强度 刚度 有限元 单门式
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900t单梁单门式搬运梁机为550t单线运梁车装梁技术研究
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作者 刘元宝 仙进兵 《铁道建筑技术》 2023年第11期121-124,共4页
我公司承建的南玉铁路项目,承担标段内757孔箱梁运架施工任务,其中单线箱梁44孔。因支座承载力、桥墩垫石宽度等不同,单、双线箱梁运架施工须采用不同的运架施工设备,为此配置单、双线运架设备各一套,共用900 t单梁单门搬运梁机。单线... 我公司承建的南玉铁路项目,承担标段内757孔箱梁运架施工任务,其中单线箱梁44孔。因支座承载力、桥墩垫石宽度等不同,单、双线箱梁运架施工须采用不同的运架施工设备,为此配置单、双线运架设备各一套,共用900 t单梁单门搬运梁机。单线运梁车长度为42 m(翻折驾驶室后),配备的第一代单梁单门式搬运梁机最大净跨39 m,无法给单线运梁车装梁。结合现场实际工况,自主研制了一种单线梁装梁工装和方法,解决了现场实际问题。该种装梁施工方法可为类似工况提供技术参考,在高铁施工领域推广应用。 展开更多
关键词 单线箱梁 单双线共存 装箱 单线运梁车 单梁单门式搬运梁机
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Zeros of Differential Polynomial f(z)f(k)(z) -- a and Its Normality 被引量:6
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作者 LU Qian GU Yong-xing 《Chinese Quarterly Journal of Mathematics》 CSCD 2009年第1期75-80,共6页
Suppose that function f(z) is transcendental and meromorphic in the plane. The aim of this work is to investigate the conditions in which differential monomials f(z)f(k)(z) takes any non-zero finite complex nu... Suppose that function f(z) is transcendental and meromorphic in the plane. The aim of this work is to investigate the conditions in which differential monomials f(z)f(k)(z) takes any non-zero finite complex number infinitely times and to consider the normality relation to differential monomials f(z)f(k) (z). 展开更多
关键词 differential polynomial meromorphic functions ZEROS normlity
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SEE Laboratory: Single-Story, Single-Bay Portal Frame
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作者 Jessica Opinion Veronica Rico +2 位作者 Melissa Guardado David Boyajian Tadeh Zirakian 《Journal of Civil Engineering and Architecture》 2017年第5期442-447,共6页
This research paper describes an SEE (Structural Engineering Encounter) Lab project. The paper reports on the development of a single-story, single-bay portal frame model as part of the AIMS2 (attract, inspire, men... This research paper describes an SEE (Structural Engineering Encounter) Lab project. The paper reports on the development of a single-story, single-bay portal frame model as part of the AIMS2 (attract, inspire, mentor and support students) grant supported through the US DOE (Department of Education) summer research program at California State University, Northridge. This research effort is part of a comprehensive program to develop laboratory models of structures commonly encountered in civil engineering practice, which can serve the dual purpose of accomplishing engineering education and research in the areas of structural and earthquake engineering. The objective of the present study was to construct a physical model of the aforementioned frame to experimentally collect data due to the application of vertical and lateral loadings through instrumentation such as strain gages and an LVDT (linear variable differential transformer) displacement transducer, and also to make comparisons with theoretical and numerical predictions. 展开更多
关键词 SEE lab active learning portal frame EXPERIMENTATION THEORY numerical simulation.
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Fast and Simple Motion Tracking Unit with Motion Estimation
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作者 Hyeon-cheol YANG Yoon-sup KIM +3 位作者 Seong-soo LEE Sang-keun OH Sung-hwa KIM Doo-won CHOI 《Journal of Measurement Science and Instrumentation》 CAS 2010年第3期233-237,共5页
Smweillance system using active tracking camera has no distance limitation of surveillance range compared to supersonic or sound sensors. However, complex motion tracking algorithm requires huge amount of computation,... Smweillance system using active tracking camera has no distance limitation of surveillance range compared to supersonic or sound sensors. However, complex motion tracking algorithm requires huge amount of computation, and it often requires exfmasive DSPs or embedded processors. This paper proposes a novel motion tracking trait based on different image for fast and simple motion tracking. It uses configuration factor to avoid noise and inaccuracy. It reduces the required computation significantly, so as to be implemented on Field Programmable Gate Array(FFGAs ) instead of expensive Digital Signal Processing(DSPs). It also performs calculation for motion estimation in video compression, so it can be easily combined with surveil system with video recording functionality based on video compression. The proposed motion tracking system implemented on Xilinx Vertex-4 FPGA can process 48 frames per second, and operating frequency of motion tracking trait is 100 MHz. 展开更多
关键词 active tracking camera Surveillance system differential image moving picture encoding
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