降低熟料出口温度的研究

对“降低熟料出口温度的研究”进行可行性论证,通过大量的计算数据和熟料冷却的原理证明,在传统的氧化铝熟料窑和单筒冷却机之间加一小型篦冷机,可以降低熟料出冷却机的温度。文章介绍了项目实施后的经济效益、存在的问题以及改进情况。     

单纤维平均梳理力的研究

建立了单纤维平均梳理力的计算公式,通过工艺实验揭示了不同梳理工艺条件下,单纤维平均梳理力对生条中棉结和短绒的影响,并根据单纤维平均梳理力推算了锡林齿条前角其余角的最小值.     

Unsteady viscous flow over elliptic cylinders at various thickness with different reynolds numbers

Two-dimensional incompressible Navier-Stokes equations are solved using SIMPLER method in the intrinsic curvilinear coordinates system to study the unsteady viscous flow physics over two-dimensional ellipses Unsteady viscous flows over various thickness-to-chord ratios of 06, 08, 10, and 1 2 elliptic cylinders are simulated at different Reynolds numbers of 200, 400, and 1,000 This study is focused on the understanding the effects of Reynolds number and elliptic cylinder thickness on the drag and lift forces The present numerical solutions are compared with available experimental and numerical results and show a good agicement Through this study, it is observed that the Reynolds number and the cylinder thickness affect significantly the frequencies of the force oscillations as well as the mean values and the amplitudes of the drag and lift forces     

梳棉机生条结杂的研究与控制

为探讨梳棉机生条结杂的控制措施，研究了影响梳棉机生条结杂的主要因素，得出影响梳棉生条结杂的因素很多，情况也比较复杂，必须有针对性地加以处理，从原棉抓起，采用合理工艺，以最小成本来控制生条的结杂数量。     

Buckling strength verification of cantilevered cylindrical shells subjected to transverse load using Eurocode 3

At present, there are only a few studies concerning the application of different types of buckling strength verification according to Eurocode 3 at combined loading. Besides the stress design as classical hand calculation method of checking cylindrical steel shells against buckling failure, the new Eurocode 3 also offers two global numerical analyses at different modelling levels. The linear buckling analysis (LBA) combined with a materially nonlinear but geometrically linear analysis (MNA) is the simpler concept from the perspective of the modelling and calculation effort. The more sophisticated method is a geometrically and materially nonlinear analysis of the imperfect structure (GMNIA). This paper presents the application of both numerical concepts to the cantilevered shell subject to a transverse load at the free edge. The results are compared to those from stress design. There are specific features at both types of numerical analysis: As the determination of the plastic reference resistance and the buckling parameters is the main focus at MNA/LBA, the choice of proper equivalent geometric imperfections demands special diligence at GMNIA. The presented analyses show that the GMNIA concept in connection with consistent equivalent geometric imperfections may lead to a safe and economic design of cylinders subject to combined loading. At the particular load case the MNA/LBA concept currently suffers from the lack of proper regulations concerning the determination of the overall buckling reduction factor.     

水压替换油压在舞台机构中的运用

介绍了用自来水的供水压力替换液压油做动力源 ,运用到舞台升降机构中 ,取得了良好效果。探讨了在类似机构中使用自来水。     

氮压机机身断裂事故分析与处理

介绍了因二级汽缸吸气阀螺栓跌入二级汽缸上部造成氮压机机身断裂的事故,分析了事故原因,最后提出了事故的解决方法和预防措施。     

Influence of load on the tribological conditions in piston ring and cylinder liner contacts in a medium-speed diesel engine

The present work is an attempt to determine the oil film thickness in a medium-speed four-stroke diesel engine with a cylinder diameter of 200 mm. Experimental research on this topic was found necessary due to the limited amount of published information available with reference to engines of the present size. The experimental part of the study was carried out as firing engine tests, with an instrumented piston, equipped with telemetric data transmission, and an instrumented cylinder liner in a 6-in-line test engine. The study was carried out for different parts of the four-stroke working cycle and for different levels of engine power output. The results were compared with the results of computer simulations, carried out using a commercial software package. The conclusions of the study comprise aspects on the formation and development of the oil film between the rings and the liner under a set of load levels together with the periodical fluctuation during different strokes of the working cycle.     

动态测量转变为静态测量的新型称重系统

结合目前动态称重技术测量精度不高的现状，在皮带称重系统中使用一个圆筒装置使动态测量转变为静态测量，达到了快速、连续、准确称量的结果，通过工控机来控制系统，并使用LabVIEW显示测量的稳态数值及控制界面。整个系统机构简单，测量和控制方法易于实现，有很好的推广使用前景。     

空压机气阀故障及其预防

气阀是空压机中最重要和最易损坏的部件之一。对5L-40／8型空压机气阀主要是正确进行定期保养、检修、安装、及时排除故障。