悬浮烘干机的流体阻力计算

悬浮烘干机是一种用于烘干粉状及小颗粒物料的新型烘干设备。在进行该烘干系统的设计时,过去由于没有计算公式而只能靠经验估计流体阻力,因此往往带来了很大的不便。在本文中,作者提出了一个悬浮烘干机阻力系数的计算公式ξ=(1-28(ab/DH))~2+2.266 经实验验证,该公式可以用来指导实际设计和生产。     

匀变速车辆的非线性悬挂系统对随机路面不平度的响应

随着各种现代车辆的出现,要求车辆的性能越来越优良,速度越来越高,因而车辆的悬挂系统对随机路面激励的响应预测,就显得十分重要。本文考虑了车辆匀变速行驶时随机路面激励的非平稳性,提出一种求解匀变速行驶车辆的非线性悬挂系统对随机路面不平度响应的简单而实用的近似方法。     

整体式转向梯形机构的优化设计

引入影响汽车行驶转向性能的轮胎侧偏、悬架侧倾和,前轮定位等主要因素,建立了汽车整体式转向梯形机构的优化数学模型,从四个方面对梯形机构进行优化设计。通过对这些结果的分析对比,得出了具有实用价值的结论。     

无轴承异步电机逆变器设计及试验研究

阐述了无轴承异步电机基本工作原理,并根据其悬浮和控制要求设计了硬件控制系统,给出了硬件电路图,通过实验得到试验波形。实验表明设计的硬件电路可以作为无轴承电机驱动的通用逆变器电路,且性能可靠。基于本硬件电路,通过DSP软件调节PID参数可实现无轴承异步电机的悬浮及旋转。     

基于SIMULINK的物料悬浮速度仿真研究

SIMULINK是MATLAB重要的组件之一，它为模拟动态系统提供了交互式程序，允许用户在屏幕上绘制框图来模拟系统。并能够动态地控制该系统。本文基于上述软件工具，设计一个模糊逻辑控制器，并应用于球形物料悬浮速度的仿真计算。从建立系统的仿真模型到仿真结果的图形化处理变得非常简单、直观和方便。     

316L不锈钢粉末的凝胶注模成形

本文对316L不锈钢粉的凝胶注模成形工艺进行了研究,分析了影响浆料流变性和凝胶化时间的因素,以及单体含量对固化胶体性状的影响.结果表明:加入聚丙烯酰胺作为分散剂可以显著降低浆料的黏度,使不锈钢粉体的固相体积分数达到54%,满足注凝成形的要求;单体的浓度对固化胶体的性质有很大的影响;引发剂和催化剂的加入量越大,聚合诱导期越短.在最佳形成工艺条件下,凝胶注模成形出的不锈钢坯体性能优良,组织均匀,生坯的抗弯强度可达38MPa,烧结体的相对密度达95%,屈服强度可达160MPa,并可成形出形状复杂的较大尺寸的不锈钢坯体.     

DYNAMIC PROGRAMMING APPROACH TO THE DESIGN OF A SOLVENT EXTRACTION PROCESS IN FAST BREEDER REACTOR FUEL REPROCESSING

Solvent extraction process in nuclear fuel reprocessing is considerably large and complicated system. For the design of individual contactors, several computer codes for calculating concentration profiles have been developed. Based on these computer codes. Complex method and the concept of Dynamic Programming are applied to the solvent extraction process design problem, which is thereby reduced to a problem of optimization. Numerical calculations are carried out, resulting in optimal process variables well within the range of practicability.     

Stretching, shearing and solidification

It has been suggested that isothermal flow-induced crystallization is linked jointly to shear strain and strain-rate. By combining continuum mechanics methods and experimental results, an invariant general strain-rate-strain model for some crystallizing polymers, applicable to all flows, is constructed. Examples show the great differences of response in shear and elongation; at a given rate elongation is the more powerful promoter of crystallinity.     

Comparative study of dynamic analysis techniques in vehicle simulation

Several dynamic analysis techniques are compared with a planar vehicle model. Cartesian formulation, suspension superelement technique, velocity transformation, and recursive formula are compared. The relation between the recursive formula and velocity transformation is investigated. When those techniques are applied to a planar vehicle with two independent suspensions, the efficiency of those methods was compared. The computational efficiency of the recursive formula was higher than those of other methods for the specific planar vehicle example.     

农药悬浮剂的物理稳定性问题

从粒子间的相互作用及强絮凝的方法，晶体的长大及其防止，粒子的沉积及其防止三个方面讨论了农药悬浮剂稳定性方面的主要问题，并简要介绍了农药悬乳剂物理稳定怀的一些新的测定技术。