Research on cylindrical shell vibration reduction systems

Longitudinal and horizontal vibration must both be reduced in an effective vibration isolation system. We present a cylindrical shell vibration isolator as a dynamic system composed of four springs and dampers. Vibration is directly produced by the motion of machinery, and more is subsequently generated by harmonic frequencies within their structure. To test the effectiveness of our isolator, we first determined equations for the transmission of vibration from the machine to its cylindrical shell. Damping effects produced by the vibration parameters of our system are then analyzed.     

山东体育学院教授公寓楼(Ⅰ期)结构设计

介绍山东体育学院教授公寓楼结构设计中所选用的参数,包括适用高度、高宽比、结构平面布置、防震缝和沉降缝、基础埋深等指标,正确理解相关规范并采取相应的结构设计,使结构安全适用、经济合理。     

Numerical simulation of the anti-shock performance of a gear case

Both sea battles and testing of ship in underwater explosions reveal unacceptably poor anti-shock performance of important shipboard equipment. Anti-shock performance of shipboard equipment is a significant factor determining fighting strength and survivability. The anti-shock performance of a shipboard gear case based on BV043/85 was investigated using numerical simulation. A geometric model of the gear case was built using MDT software and meshed in HyperMesh software, and then the finite element model of the gear case was formed. Using ABAQUS software, the anti-shock performance of the gear case was simulated. First, shock response of typical regions of gear case was determined. Next, some generalizations were made about the anti-shock performance of the gear case by analyzing the Mises stress of typical regions varied with shock inputs. Third, weak regions were determined from simulation results. The threshold values of shock resistance of the gear case at different impulse widths were obtained through interpolating the numerical simulation results selected from the most dangerous spot. This research provides a basis for further optimization of the design of gear cases.     

名古屋港三大桥的建设

本文译自日本杂志《J SSC》,No.29.作者是日本道路公团名古屋建设局构造技术科的铃木裕二.文中介绍了日本第二东名(东京-名古屋)高速公路、第二名神(名古屋-神户)高速公路的连接处的名古屋港的三座连续斜拉桥的建设概况.     

简支梁桥主梁与挡块间不同接触形式的抗震性能分析

在经历大地震时,为了避免桥梁发生落梁等灾难性损坏,在桥梁构造措施中,通常要设置横向限位装置等以防落梁。分析比较实际工程中,挡块与主梁间加橡胶垫块、木垫块、二者不预留间隙和留有3cm间隙的不同工况下,挡块所受碰撞力及桥墩弯矩值的变化,得到不同情况下墩和横向限位装置破坏的先后顺序,对挡块在抗震中起到的作用进行评估,给出合理的主梁与挡块的接触形式。     

轻而“易”举 华硕二代易PC900

和第一代的悄然登场不同,华硕第二代易PC——EeePC900即将高调上市。易PC因为便利、轻巧与人性化的接口设置,已经成为许多人生活中不可或缺的一部分。新一代易PC 900除了继承上一代摩登外表、轻巧易携之外,将屏幕扩展到