用水压爆破方法拆除澄清池

根据拆除物的结构特点，进行了澄清池水压爆破的设计计算。利用等效药量与等效距离对爆破近区的振动强度进行了验算。     

复杂结构水池水压爆破拆除

结合工程实践,对中间有隔断墙泊封闭游泳池用水压爆破拆除时,药量的计算、药包的分配和布置以及微差时间确定的方法进行了探讨,以供参考。     

水压爆破拆除钢筋砼蓄水池工程实践

一个内层是钢筋混凝土,外层为水泥浆石构筑,上下壁厚变化的水池拟于拆除,采用水压爆破为主,外层下部炮孔爆破为辅的组合爆破技术,拆除效果理想.给出了水压爆破药量确定方法,炮孔布置方式,施工工艺及安全防护措施.     

Use of Asymptotic Methods in the Temperature Problem on Filtration of Gassed Oil in a Pool

The temperature fields arising in the filtration of a gassed liquid in saturated porous media have been theoretically investigated with simultaneous consideration for the gasphase imperfection, phase transitions, and heat exchange between an oil pool and the surrounding rocks.     

上杭县淀粉厂钢筋砼水池水压爆破实践

通过对两组钢筋砼水池水压爆破实践,介绍水压爆破设计参数选取及施工工艺措施.实践证明,改进水压爆破的工艺措施可达到安全有效、快速便捷拆除钢筋砼水池的目的.     

水压爆破拆除圆形复合材质水池

介绍了水压爆破拆除容积 1 236 m3 钢筋-砖复合结构水池的爆破方案、爆破参数及爆破效果,并对爆破效果进行讨论.     

节理岩体爆破数值模拟

岩体的节理裂隙常常会影响爆破效果,而且会由此增加大块率,提高爆破成本.为了探明节理岩体爆破特点,首先采用有限元方法模拟了节理岩体爆破应力场的分布特点,接着分析了在台阶底部不同点的等效应力的变化规律,最后模拟了爆炸能量在节理岩体的传播规律.研究结果表明,节理裂隙能有效地反射爆炸应力波,节理裂隙越多,波的反射就越强,而且反射波的强度随着弱面与岩体间的波阻抗的差值的增加而加大;台阶底部各点的有效应力随着节理裂隙的存在而发生复杂的变化,而不象在均质岩体中一样有规律;炸药爆炸产生的动能在节理岩体中衰减快,透过闭节理时能量的衰减比透过充填节理要慢,爆炸能量透过倾斜节理时衰减较慢,而透过垂直节理时衰减较快.     

双裂纹转子振动特性的有限元和实验研究

转子裂纹是旋转机械常见故障,目前对转子复合裂纹的研究尚不够深入。本文运用有限元方法对具有两条横向裂纹的转子系统动力学特性进行仿真分析,研究了不同裂纹夹角的转子动力学行为,得到转动过程中两条裂纹开闭的关系。与实验结果对比,验证了模拟的有效性。     

一类无搅拌的双营养竞争模型的数值模拟

本文使用单调方法讨论了一类无搅拌的双营养Chemostat竞争模型,得到了物种灭绝和持续共存与相应特征值的关系。进而,采用Crank-Nicholson有限差分格式,运用数值模拟的方法判定了特征值的范围。     

Filtration in a porous medium with a fluctuating permeability

Based on the T-matrix method, filtration in a porous medium with a fluctuating permeability is investigated. A closed system of equations for the T-matrix and the pressure is obtained. A fluctuation correction to the output is calculated. Cases of correlation functions of the first and second kinds are analyzed. Institute for Problems of Geometry, Makhachkala, Russia. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 2, pp. 238–242, March–April, 1996.     

焊接熔池组织模拟的GBE模型

介绍了焊接熔池组织模拟的GBE模型。此模型是通过计算相邻晶粒间晶界的位置变化来模拟晶粒的生长，为焊接熔池组织的模拟提供了新思路。重点介绍了模型假设和模型的实现，并对此模型进行了评述，提出了模型的发展方向。     

Three-Dimensional Numerical Simulation of Pure Solutocapillary Flow in a Shallow Annular Pool for Mixture Fluid with High Schmidt Number

In order to understand the characteristics of pure solutocapillary flow in a shallow annular pool subjected to a constant radial solutal gradient, a series of three-dimensional numerical simulations were performed. The annular pool was filled with the toluene/n-hexane mixture fluid with the Schmidt number of 142.8. The inner and outer cylinders were respectively maintained at low and high solutal concentrations. Aspect ratio of the annular pool is fixed at ε = 0.15 or 0.05. Results indicate that the solutocapillary flow is steady and axisymmetric at a small solutal capillary Reynolds number. The surface fluid flows radially from the inner cylinder toward the outer cylinder and a return flow exists near the bottom. With the increase of the solutal capillary Reynolds number, an axisymmetric oscillatory flow firstly appears and then becomes a three-dimensional oscillatory flow at ε = 0.15. Whereas at ε = 0.05 a direct transition from the steady and axisymmetric flow to the three-dimensional oscillatory flow is observed. Three types of the flow instabilities are the standing wave, hydrosolutal wave and source/sink type wave instabilities. Furthermore, the physical mechanism of the flow destabilization is analyzed.     

Filtration of a compressible gas in an apparatus with a diaphragm

Results of an experimental investigation of the filtration of a compressible gas in an axisymmetric apparatus with a diaphragm mounted in the layer of charge or at the exit from the apparatus are presented. A dependence is given to compute the resistance of the apparatuscharge system.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 35, No. 6, pp. 980–986, December, 1978.     

Macroscopic Pressure Filtration Field in a Medium with Double Porosity

Journal of Engineering Physics and Thermophysics - This article presents a mathematical model of the pressure filtration field in a porous medium with a skeleton formed by two solid phases of...     

机械工程中液压油污染检测二法

介绍了肉眼法和磁塞探测法二法在工程机械液压系统油污染监测中的应用,比较了二种方法的优点和缺点。并且根据它们各自的特点,工程机械的实际使用过程中可将二者结合使用可达最佳效果。     

液压挖掘机工作装置在ADAMS中的运动仿真分析

虚拟样机技术的应用为解决液压挖掘机的设计开发提供了方法和手段。但目前由于条件受到限制,还是较少单位会对样机进行运动学仿真分析,这就大大降低了设计方案的可行性。本文用Pro-E对液压挖掘机进行了三维建模,并进行了虚拟装配,建立了挖掘机工作装置的虚拟样机。最后,通过在动力学仿真软件ADAMS中建立了挖掘机工作装置的虚拟样机系统,完成了模型的前处理工作,并校验了模型的正确性。