A super-element approach for structural identification in time domainFrontiers of Mechanical Engineering in China - Tập 1 - Trang 215-221 - 2006
Jie Li, Xin Zhao
For most time-domain identification methods, a complete measurement for unique identification results is required for structural responses. However, the number of transducers is commonly far less than the number of structural degrees of freedom (DOFs) in practical applications, and thus make the time-domain identification methods rarely feasible for practical systems. A super-element approach is p...... hiện toàn bộ
Study of mechanism of activating flux increasing weld penetration of AC A-TIG welding for aluminum alloyFrontiers of Mechanical Engineering in China - Tập 2 - Trang 442-447 - 2007
Yong Huang, Ding Fan, Qinghua Fan
When multi-component flux AF305 is used as surface activating flux for an aluminum alloy, the weld penetration of activating flux-tungsten inert-gas (A-TIG) welding is over two times more than that of conventional TIG welding. Using A-TIG welding with the modes of alternating current (AC), direct current electrode negative (DCEN) and direct current electrode positive (DCEP), respectively, the flux...... hiện toàn bộ
Depth of cut models for multipass abrasive waterjet cutting of alumina ceramics with nozzle oscillationFrontiers of Mechanical Engineering in China - Tập 5 - Trang 19-32 - 2009
Jun Wang
An experimental study of the depth of cut in multipass abrasive waterjet (AWJ) cutting of alumina ceramics with controlled nozzle oscillation is presented. It is found that this cutting technique can significantly increase the depth of cut by an average of 50.8% as compared to single pass cutting without nozzle oscillation under the corresponding cutting conditions and within the same cutting time...... hiện toàn bộ
WEIS wheel speed real-time measuring method for VOSMFrontiers of Mechanical Engineering in China - Tập 5 - Trang 322-327 - 2010
Mengyao Pan, Guixiong Liu, Tusheng Lin, Xiaobin Hong
Wheel speed is one of the key parameters of vehicle operating attitude. To solve the problems in traditional wheel speed measuring methods, such as low measurement precision and the lack of real-time monitoring of the vehicle’s operating attitude, a wheel embedded intelligent sensors (WEIS) wheel speed measuring method for vehicle operating safety states monitoring (VOSM) is innovatively proposed....... hiện toàn bộ
New kind of subarea-parallel scanning mode for laser metal deposition shapingFrontiers of Mechanical Engineering in China - - 2007
Hongyou Bian, Weijun Liu, Jibin Zhao
A scanning mode is the key technology in a laser metal deposition shaping (LMDS) fabrication process. On the basis of the analysis of existing scanning modes and their influences on the fabrication efficiency and the quality of parts, some disadvantages of them are pointed out. A new kind of subarea-parallel scanning mode for LMDS based on a subdividing profiled outline into monotonous polygon sub...... hiện toàn bộ
Loop theory and applications to some key problems of kinematic structure of kinematic chainsFrontiers of Mechanical Engineering in China - Tập 4 - Trang 276-283 - 2009
Huafeng Ding, Zhen Huang
Structure synthesis of mechanisms is a pivotal issue in the field of mechanical innovation and mechanical conceptual design. In this paper, a new loop theory of kinematic chains is proposed. Based on this theory, some key problems that hamper computer-based automatic synthesis of mechanisms are solved. 1) The open problem of isomorphism of kinematic chains that has lasted for more than four decade...... hiện toàn bộ
Dynamic analysis of free-surface thin film flows driven by gravity over undulated substrateFrontiers of Mechanical Engineering in China - Tập 5 - Trang 219-225 - 2010
Zhaomiao Liu, Xin Liu, Guobin Wang, Hong Liao
This paper studies thin film flows with free surfaces driven by gravity through two types of undulated planes: periodically sinusoidal plane and triangle. The substrate plane is fixed and inclined to a certain angle and the flow with a free surface. Through finite element method (FEM), commenced from Navier-Stokes equations and continuity equation, the exact numerical results of free-surface film ...... hiện toàn bộ
Design of composite flywheel rotorFrontiers of Mechanical Engineering in China - Tập 3 - Trang 288-292 - 2008
Yue Bai, Qingjia Gao, Haiwen Li, Yihui Wu, Ming Xuan
A design method for a flywheel rotor composed of a composite rim and a metal hub is proposed by studying the connection between the rotor and the driving machine. The influence of some factors such as the rotor material, configuration, connection, and fracture techniques on energy density is analyzed. The results show that the ratio of the inner radius to outer radius of the rim is the key factor,...... hiện toàn bộ