基于VC＋＋实现公路工程试验数据的处理系统

介绍了在公路工程试验室管理中,运用Visual VC＋＋实现公路工程试验室数据处理系统的方法,其中包括数据存储、窗口界面、报表打印等主要功能的构成。叙述了系统总体设计、数据存储、菜单设计、工具栏设计、用户窗口设计及报表打印的步骤和方法。     

赛道上的“幽灵之子”——帕加尼Zonda R

帕加尼初登超跑舞台是在上世纪90年代末, 以其独一无二的外形和灵敏异常的操控,短时间内便跻身一线行列。 其实,帕加尼车身上的大多数组件都来自于不同国家的不同品牌, 然而就是这样一个“作坊式”的厂家,凭借着纯粹的性格, 创造出世界上别具一格的超级跑车,这其中ZondaR车型,便是纯粹之中的纯粹……     

无锡金匮桥主桥钢箱梁设计

介绍了无锡金匮桥主桁结构设计、桥面系设计、非机动车道及人行道设计、静力分析及主要施工方法;为解决非机动车道与机动车道纵坡不一致的问题创造性地提出了采用调整托架的高度方法,事实证明在该桥上的应用是成功的;对该桥进行了详细的静力分析和稳定计算,计算表明,大桥各构件受力性能满足要求,大桥具有较好的稳定性。     

基于瞄准点排布模型的多发同时弹着射击诸元解算

文章以大口径舰炮单炮多发同时弹着火控机理为研究对象,通过分析单炮序列发射同时弹着的工作流程,建立了瞄准点排布模型、弹道微分方程组模型、射击诸元解算模型,并应用数值分析与仿真计算的方法,计算与分析相应瞄准点排布下的射击诸元参数序列,为射击指挥与决策提供参考。     

潜艇上方近场水下辐射噪声双峰特性的实验研究(英文)

The double-peak characteristic of underwater radiated noise in the near field on top of the target submarine was analyzed in depth on the basis of submarine test data on the sea. The contribution of three major noise sources to the radiated noise of a submarine were compared and analyzed, and emphasis was put on the original source, production mechanism, and their correlative characteristics. On the basis of analysis on underwater tracking and pass through characteristics of the target submarine, the double-peak phenomenon was reasonably interpreted. Furthermore, the correctness of the theoretical interpretation was verified adequately in real submarine tests. The double-peak phenomenon indicates that the space distributing character on submarine radiated noise are both asymmetrical with time and space, whereas that is provided with directivity. Studying the double-peak phenomenon in depth has important reference value and meaning in engineering practice for understanding the underwater radiated noise field of submarines.     

两种直接波浪能转换系统性能的比较:阿基米德波浪摆和波能浮筒(英文)

Many wave energy conversion devices have not been well received. The main reasons are that they are too complicated and not economical. However, in the last two decades direct conversion systems have drawn the attention of researchers to their widely distributed energy source due to their simple structure and low cost. The most well-known direct conversion systems presently in use include the Archimedes Wave Swing (AWS) and Power Buoy (PB). In this paper, these two systems were simulated in the same conditions and their behaviors were studied in different wave conditions. In order to verify the simulations, results of the generator of the finite element computations were followed. An attempt was made to determine the merits and drawbacks of each method under different wave conditions by comparing the performance of the two systems. The wave conditions suitable for each system were specified.     

双通线加热的热力学及实验分析(英文)

The present investigation deals with process analysis of oxy-acetylene flame assisted double pass line heating for varying plate thickness. oxy-acetylene flame as the heat source for multi pass line heating to achieve 3-D bending of plates with varying thicknesses was studied. The oxy-acetylene flame was modeled as the moving heat source in the FEM analysis. The transient thermal histories were predicted taking into account the temperature dependent thermo-mechanical properties. A comparative study between single pass and double pass line heating residual deformation was also carried out. The temperature distribution and residual deformations predicted by the numerical model developed in the present work compared fairly well with those of the experimental ones.     

10kV电缆绝缘监测用直流电源的设计

针对靠岸船舶供电系统中10 kV XLPE电力电缆绝缘监测系统的需求,采用洛埃耶逆变-变压-全桥整流-稳压输出的方案,并利用可调式集成稳压器设计12 VDC输入,80 VDC输出的直流电源.给出了Ap法变压器的设计过程.测试结果表明该电源性能好,结构简单,工作可靠,可以满足绝缘监测系统的需求.     

Experimental Investigation of TARMAX Model for Modeling of Hydrodynamic Forces on Cylinder-like Structures

A new approach that models lift and drag hydrodynamic force signals operating over cylindrical structures was developed and validated. This approach is based on stochastic auto regressive moving average with exogenous (ARMAX) input and its time-varying form, TARMAX. Model structure selection and parameter estimation were discussed while considering the validation stage. In this paper, the cylindrical structure was considered as a dynamic system with an incoming water wave and resulting forces as the input a...     

浅析盾构隧道模型试验的现状与发展

模型试验是盾构隧道相关研究工作中常用的研究手段。文章对目前盾构隧道模型试验所涉及到的问题进行了系统总结分析,将其归结为管片结构的受力问题、隧道结构本身的分析模型问题、结构与围岩的相互作用问题、开挖面稳定问题、结构与邻近结构物的相互作用问题、隧道施工扰动与控制问题,以及其他问题等。通过典型模型试验实例,对每类问题进行了分析阐述,系统归纳了模型试验在盾构隧道相关研究工作中的进展和成果。针对盾构隧道模型试验经常涉及到的诸如结构模型、模型土、模型箱等材料的选择,加载方案的设计,以及试验方案的综合设计等问题进行了阐述分析,并针对性地提出了意见和建议。