利用AGM求解粘弹性地基刚性梁的非线性控制微分方程（英文）

In the present paper a vibrational differential equation governing on a rigid beam on viscoelastic foundation has been investigated. The nonlinear differential equation governing on this vibrating system is solved by a simple and innovative approach, which has been called Akbari-Ganji’s method(AGM). AGM is a very suitable computational process and is usable for solving various nonlinear differential equations. Moreover, using AGM which solving a set of algebraic equations, complicated nonlinear equations can easily be solved without any mathematical operations.Also, the damping ratio and energy lost per cycle for three cycles have been investigated. Furthermore, comparisons have been made between the obtained results by numerical method(Runk45) and AGM. Results showed the high accuracy of AGM. The results also showed that by increasing the amount of initial amplitude of vibration(A), the value of damping ratio will be increased, and the energy lost per cycle decreases by increasing the number of cycle. It is concluded that AGM is a reliable and precise approach for solving differential equations. On the other hand, it is better to say that AGM is able to solve linear and nonlinear differential equations directly in most of the situations. This means that the final solution can be obtained without any dimensionless procedure.Therefore, AGM can be considered as a significant progress in nonlinear sciences.     

Numerical Analysis of Thermal Distortion and Residual Stresses in H13 Steel Due to Vacuum Gas Quenching

IntroductionVacuumgasquenchinginvolvinghighpressuregasasacoolingmedium,is.anincreasinglypoPularheattreatffienttechniquefor1argesteeldieblocks,forexamPleHl3die.ItisconsideredessefltialtounderstandthentheeofthegasflowandtheinfiuencethishasontemPeratureprofilesandresultaflresidualstresseswithintheheattTeatedcomPonent.SimulatingthisprocessinvolvesthesimulationofgasflowinthefurnaceaswellasthesimulationofthethermalbehaviourofthecomPoneni.However,thereisnosinglecomPatersoftwarepackageavailabletot…     

柴油机气缸动力组的磨损对油气窜缸和机油消耗的影响

对于现代柴油机 ,耐久性是非常重要的。柴油机制造商力图延长大修期 ,而大修期通常受机油消耗率和油气窜缸情况支配。因此 ,理解发动机磨损 ,对气缸动力组动力学性能、对机油消耗率以及对油气窜缸的影响是必要的。本文利用气缸动力组动力学模型探讨气缸动力组部件 (活塞环和气缸套 )磨损的影响。所用的模型可预测磨损对活塞环运动、环间气体压力、油气窜缸等的影响。研究的参数有 :气缸套磨损、活塞环外表面磨损以及活塞环侧平面磨损。对两种不同型式的柴油机分别进行了模拟 ,这两种柴油机的特点明显不同。研究结果表明 ,磨损对两者的影响是有区别的 ,其相应的寿命也是不同的 ,这说明对不同型式的柴油机需要分别进行模拟化工作。模拟结果表明 :第一道环外表面磨损对于保持良好的控油以及油气窜缸控制影响非常明显 ;气缸套磨损是重要的 ,但其影响程度不如活塞环磨损 ;活塞环侧平面磨损对于两种情况均有明显影响     

“欧洲飞人”——西门子公司制造的环保型内燃机车

根据在奥地利的广泛实践，新的2016型内燃机车既适用于干线客货运作业，也适用于调车作业。为了满足未来的要求，西门子公司运输部以2016型机车为基础，开发出一个干线内燃机车系族——“欧洲飞人20”(EuroRunner20)。本文侧重介绍为达到在环保方面不断提高的目标所做的开发研究工作以及该系族机车在降低燃油消耗率、噪声和废气排放方面所取得的成果。     

硬质合金滚刀滚齿时机械应力的计算

滚齿时使用硬质合金滚轨，给切削性能的提高提供了可能，在切削加工开始时，刀齿的崩刃妨碍着硬质合金滚刀的成功使用，刀齿刃口的破碎主要因机械过载所造成为了确定切削过程中滚刀刀齿上的机械应力，同时优选滚刀和机加工数据，一种计算机后援计算方法被开发使用，本文讨论这种方法，计算实例表明了刀齿上的应力分布情况，该应力在滚削螺旋齿轮时，有可能引起刀齿的崩刃。     

线性SBS与蒙脱石粘土复合改性常规沥青的性能

为研究有机改性粘土及含硫化合物对线性SBS改性沥青流变特性的影响,通过三因素和五种水平的统计学试验设计方案,采用传统的物理混合方法制备了改性沥青,使用小振幅正弦振荡的动态剪切流变仪研究了沥青结合料的线性粘弹特性,利用弯曲梁流变仪测量了聚合物改性沥青(PMA)的低温蠕变特性。研究表明:在沥青服役温度范围内,有机改性粘土对改性沥青的流变学特性有显著影响。     

电动力总成系统的开发和优化

出于降低CO2和颗粒排放的要求,电动力总成模块的应用日益广泛。在该情况下,博格华纳公司对功率电子器件、变速器和电机等产品进行了技术改良,以便为用户提供性能优越的零部件和系统。