冷轧支承辊剥落原因分析及对策

本文对我厂支承辊剥落原因进行了分析,得出支承辊剥落是由于接触高点应力集中导致次表层产生疲劳裂纹,疲劳裂纹向表层扩展最终产生剥落。     

基于稳态误差的热连轧弹跳方程优化算法

热连轧带钢生产过程中,在停轧、换辊后会出现带钢厚度精度低的情况,影响到带材的成材率.为解决此问题,提出了新的轧辊磨损和热膨胀模型,并引入模型稳态误差量的概念,对弹跳方程进行优化改进.现场实际应用效果表明:换辊后首块钢的厚度偏差在40μm范围内达到90%以上,长时间停轧之后厚度偏差提高到30μm以内,满足自动厚度控制系统(AGC)的控制要求,提高了产品的成材率.并给出了弹跳方程稳态误差的普遍求解方案,模型在线使用效果良好,适于工业推广.     

从摇滚乐到人类学——人类学学者访谈录之四十二

摇滚乐反映了年轻人的一种对时代的责任,对现实的反思,它也体现了年轻人的生存状态,一种态度。摇滚乐从形式到内核都有对现代一种反思在里面,现代社会的人们对摇滚的态度已经是多元的了。     

高速钢热轧辊的成分设计与热处理

利用扫描电镜、X射线和金相法详细研究了9种热轧用高速钢轧辊的相组成和显微结构，分析了成分变化和热处理工艺对显微结构和显微硬度的影响，确定1050℃～1150℃为最佳淬火温度、560℃最佳回火温度。确定含量V、C、W、Cr的份数分别为6％～7％、2．06％～2．31％、10．5％～14．4％、4％～6％为最佳成分配比。     

聚氨酯冷轧胶辊的研制

用聚酯多元醇、TDI、MOCA等原料进行了冷轧聚氨酯胶辊胶料的研究，讨论了原料、配方对胶料性能的影响，介绍了生产中常见的问题及解决办法。     

Interfacial toughness in polymer‐layered laminar composites

The investigation of the interfacial toughness of polymer layered laminar composites with two different approaches produced results differing by up to an order of magnitude and following opposite trends with respect to the strain rates. The flexural modulus and neutral axis of a constrained epoxy‐adhesive layer bound to a painted metal substrate varied with the thickness of the adhesive layer. The adhesion energy depended on the rate at which the force was transmitted to the adhesion bonds—not just on the strength of the adhesion bonds—and on the concomitant strain hardening at high strain rates. As the strain rate and thickness of the polymer layer increased, the transition from a cohesive mode to an adhesive–cohesive (polymer–polymer interface) mode of debonding led to the observed high adhesion energy. The high adhesion energy and increased strain hardening were attributed to the formation of organic–inorganic composites and nanocomposites within the polymer matrix, which evolved as a result of the interactions between the metal oxide pigments and fillers with the polymer matrix during curing. Scission of the polymer chains at the interface was proposed to be the predominant fracture mechanism; it was based on the high relaxation time (～10¹⁷ s) and the high activation energy (～175 kJ mol^?1). © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 3822–3835, 2004     

直缝焊管成型机接触压力研究

根据全息光弹实验结果得出的轧辊接触压力的分布规律，进而利用能量方法、轧压理论及厚壁筒理论对开口孔型、闭口孔型的轧辊接触压力进行计算。结果表明理论计算与实测值比较接近，有一定的应用前景。     

造纸机压榨辊过盈装配时的可靠性设计

以造纸机上常用压榨辊为例,利用可靠性理论,对其过盈装配进行分析和研究,为压榨辊过盈装配时自身强度的可靠问题提供设计依据。     

Flow simulation in the nip of a rigid forward roll coater

This paper shows the development of an efficient solution algorithm for the simulation of a forward roll coating flows with free surfaces. The technique is based on the method of successive approximation combined with a method for rapidly finding a good starting point, i.e. a good initial computational domain. Movement of the free surface from the initial to final positions is demonstrated using both kinematic and normal stress schemes. Adaptive domain decomposition at each pseudo time step is performed with no significant cost penalty. The flow field is computed using a finite element solution of the Navier–Stokes equation. The proposed scheme is shown to be flexible enough to accommodate different scenarios over the practical range of many applications, i.e. capillary numbers in the range of 0.01–300, and a wide range of gap settings and rotational speeds. A close match is found between simulation and experimental meniscus profiles as well as nip pressure profiles. Overall the technique is quite robust and is able to simulate a variety of coating flow situations without resorting to over‐simplifications. Copyright © 2005 John Wiley & Sons, Ltd.     

汽车主动悬架系统控制器的设计与仿真研究

基于系统动力学理论建立整车模型主动悬架系统的动力学模型,采用分块研究方法,分别对1/4模型的垂直运动、1/2车体的俯仰运动和侧倾运动进行独立研究,然后把这三个模型叠加在一起构成整车动力学模型和控制器模型;其次在MATLAB/Simulink中建立其相应的控制器模型和仿真模型,再次采用积分白噪声模型作为路面输入形式,并结合整车主动悬架的仿真模型进行动态特性仿真;最后将主、被动悬架特性进行对比分析。仿真结果表明,相对于被动悬架主动悬架性能有明显改善。