CATIA VBA二次开发在装配中批量搜索零件的应用

文章针对汽车开发过程中,经常需要对部分特定的零件进行批量选择用于校核或者作为报告用图,给出了装配中对指定的多个零件进行程序搜索选定的方法。在介绍VB编程语言及CATIA二次开发理论的基础上,给出程序自动搜索零件的基本流程,利用CATIA Automation调用Search方法,实现零件的批量搜索。通过实例验证,证明了CATIA批量搜索的优越性。结果表明,CATIA二次开发可以提高工作效率。     

汽车电动真空泵设计及应用

电动真空泵是电动汽车真空制动系统重要的零件,该文介绍电动真空泵的结构、工作原理,以及电动真空泵的三个重要性能;通过真空制动系统对真空源的需求,探讨电动真空泵的选型和整车布置。     

纯电骡子车开发及试制新方法应用

通过对比燃油汽车与纯电动汽车整车架构,分析燃油车改制纯电动骡子车的可行性。利用现有车型完成纯电动骡子车改制,不仅可以节省开发成本,还可以加快新产品升级换代。同时基于两种车型的差异性,制定相应的车型改制方案。阐述常见的改制内容与创新方法应用,为后续同平台新车型开发提供参考。     

Study on launch dynamics of the tank marching fire

As an army main battle equipment, it is required that the tank should have high firing accuracy and high first round hit probability during marching. The initial disturbance of the projectile is the premier factor that takes effect on the marching fire accuracy of the tank. And the marching fire accuracy of the tank depends on the launch dynamics behaviors of the tank. In this paper, the launch dynamics theory of a tank marching fire is studied, and its launch dynamics model is established. Based on the transfer matrix method for multibody system(MSTMM) and the automatic deduction theorem of overall transfer equations, the overall transfer equation and the overall transfer matrix of a tank multibody system are deduced; the launch dynamics equations of the tank marching fire are deduced, and the dynamic response of the tank system, the motion of projectile in barrel, the initial disturbance of the projectile and the vertical target dispersion are exactly simulated; meanwhile, the results of simulation are verified by tests. This work provides both theoretical foundation and simulation approaches for improving the marching fire accuracy of the tank.     

浅议高速公路沥青混凝土桥面排水的设计与施工

高速公路通车运营后产生的桥面损坏是沥青路面早期损坏的现象之一,结合沥青混凝土桥面施工过程中所取得的部分经验与教训,从设计和施工角度对沥青混凝土桥面结构排水、防水提出了一些方法和措施,以期提高沥青混凝土桥面的耐久性。     

Timing sequence changes of landscape plants in Shanghai Area,China

Based on published reports and direct observation, the common resources of landscape plant species in the Shanghai area were identified and studied in terms of the landscape characteristics of timing sequence changes over a one year time period. The results showed that there were 199 common landscape plant species in Shanghai, distributed in 67 families and 129 genera. These plants were categorized by three ornamental characteristics: flowers, foliage and fruits. The species were thus further analyzed according to the time periods which these characteristics were present. The results showed that flower ornamental distributed throughout the year, particularly from April to June, and plant species with colorful foliage could be seen every month, and particularly in November and December. On the other hand, few plant species with fruit ornamentals were observed in Shanghai area. The diversity of landscape timing sequence changes of the 199 plant species under examination was then analyzed by using the Shannon-Weiner and Simpson index formulas. The results showed that the higher diversity was observed in January, February and from August to October, while the lowest diversity was recorded from March to July and during November and December. The diversity of landscape characteristics of these plants was ranked according to foliage, flowers and fruit. Using this method, one park and one plant community were selected to evaluate the advantages and disadvantages of their time-changing plant landscape, with the goal of assessing the validity of the chosen ranking method. These results in the present study would be helpful to evaluate the plant landscape in a specified space and further enrich the diversity of plant and landscape by a target-oriented way.     

Numerical modeling of ground response during diaphragm wall construction

Construction of diaphragm wall panels may cause considerable stress changes in heavily overconsolidated soil deposits and can induce substantial ground movement. The 3D Lagrangian method was adopted to model the mechanical response of ground, including horizontal normal stress and shear stress, lateral ground displacement and vertical ground surface settlement, during the slurry trenching and concreting of diaphragm wall panels. Numerical results show that slurry trenching leads to horizontal stress relief of ground, reducing the horizontal stress of the ground from initial K0 pressure to hydrostatic betonite pressure. Wet concrete pressure lies between the hydrostatic bentonite pressure and the initial K0 pressure, so it can compensate partially the horizontal stress loss of the ground adjacent to the trench and thus reduce the lateral movement of the trench face as well as the vertical settlement of the ground surface.     

高速公路桥梁施工风险识别及应对措施

运用风险分析理论及方法,结合新疆某公路桥梁主桥施工实例,从经济损失、环境损失、社会损失三方面对洪水作用下桥梁施工的风险进行了分析,提出了工程防治、非工程防治、生物防治方面的措施建议,可为今后高速公路桥梁施工的风险识别及应对措施提供有益的参考.     

Numerical Simulation of Float-Over Installation for Offshore Platform

In this paper, a numerical investigation of a float-over installation for an offshore platform is presented to verify the feasibility of the actual installation. The hydrodynamic performance of a T-barge is investigated in the frequency domain, and the coupled motions are analyzed in the time domain. We then compare with those of the model test and determine that the response amplitude operator and the time series agree quite well. The barge exhibits favorable hydrodynamic behavior in the considered sea state, and the equipment loads are allowable. The mooring system and sway fender forces are within the permissible range. Based on these results, we can verify that the actual installation of the offshore platform is feasible. We accurately simulated many important factors and effectively reduced the risk associated with the offshore installation, which is of great importance. As such, we demonstrate that the numerical simulation of the float-over installation for offshore platforms has practical engineering significance.