成形分析在整体侧围冲压工艺设计中的应用

以AUTOFORM软件为基础，并结合生产实际，分析和论述了成形分析在整体侧围冲压成形过程中的应用以及整体侧围在成形中出现的问题和解决方案。     

NEW OPTIMAL LARGE ANGLE MANEUVER STRATEGY FOR SINGLE FLEXIBLE LINK

INTRODUCTIONTo accommodate the requirement of lightweight,for many machine systems, such as flexiblemanipulator, large solar array and flexible antennas ofspacecraft, flexibility has become an imPOrtantcharacteristic. But flexible vibration can degrade badlythe peforance and the precision of flexible systems.Control of vibration becomes very important asdesigners attempt to push the state of the art withfaster and lighter machines systems. Researchers haveexammed many different controlle…     

焦家金矿矿体形态的变化对运输系统的影响

通过对焦家金矿主矿体形态及位置的探采对比，指出导致中段主沿脉运输巷道向矿体下盘移动的原因，得出了深部中段设计时，主沿脉运输巷距主参考面——主断层面的最小距离为１１０ｍ的统计参考值。     

LZH—6／900复合式拉丝机的加工

通过解决复合式拉丝机加工过程中的几个难点,加工质量及整机的精度得到保证,并达到了设计要求。     

Moore Automata for the Supervisory Control of Robotic Manufacturing Workcells

The potential of flexible-manufacturing workcells (FMCs) to produce a family of parts in many possible orders of operations and choices of different machines is advantageous. Despite intensive research on the theoretical control of discrete-event systems (DESs), however, current techniques can still only be used for the supervisory control of simple cells. In this paper, a novel modeling and control synthesis technique is presented for FMCs that allow part-routing flexibility. Our proposed methodology combines Extended Moore Automata (EMA) and Controlled-Automata theories to synthesize supervisors for such FMCs.     

An Analytical Queueing Network Model for Flexible Manufacturing Systems with a Discrete Handling Device and Transfer Blockings

In this paper, we study job shop-like flexible manufacturing systems (FMSs) with a discrete material handling system (MHS). In such FMSs, the MHS is a critical device, the unavailability of which may induce transfer blockings of the machines. The FMS devices therefore are hierarchically structured into primary and secondary devices to manage such blocking and avoid deadlocks in these FMSs.For evaluating the quantitative steady-state performance of such FMSs, we propose an analytical queueing network model that relies on an approximate method proposed for analyzing computer systems with simultaneous possessions of resources. Such a model is obtained using the concept of passive resources and by aggregating the FMS workload data so that models are much more tractable.The analytical results are validated against discrete event simulation and shown to be very encouraging. We also show how to increase their robustness, especially under light workload conditions, by modifying an assumption of the method concerning service time distributions.     

Petri网理论在柔性制造系统（FMS）性能分析中的应用

本文用 Petri 网的一个子类——时间事件图对流水车间型和作业车间型的柔性制造系统(FMS)建模并进行理论分析,给出了可行排序的判定条件及系统中托盘数量配置与系统生产率的关系,对系统的主要性能指标,如生产周期、工件驻留时间、在制品库存等给出了定量描述.这些结果为系统的设计和运行提供了理论依据.     

Better Sintering through Green-State Deformation Processing

Aqueous colloidal suspensions of alumina were processed in the dispersed state and the flocculated state by controlling the double-layer interactions between the particles. Repulsive particle forces led to high packing densities but the green bodies were mechanically so weak that they were unable to retain their shape (the dispersed case). Attractive forces led to good green strength but the packing density was low and the particles were agglomerated (the flocculated case). The agglomerated structure of the flocced specimens could be fragmented by mechanical deformation of the green compact; the deformation was carried out under a superimposed hydrostatic pressure of less than 1 MPa. The flow stess of the flocculated structures depended on the deformation rate, and on the magnitude of the superimposed hydrostatic pressure. The flow stress was 2.5 kPa at a strain rate of 0.1 s⁻¹. Deformation processing of the flocced structures increased the green (relative) density from 0.51 to 0.62. The sintering behavior of underformed and deformation-processed flocced structures was studied. Deformation-processed green bodies sintered more rapidly and yielded a final grain size that was smaller and more uniform than that obtained from the undeformed specimens. The ability to homogenize and densify the packing of flocculated structures by deformation processing suggests new opportunities in green-state processing, for example (i) uniform mixing of more than one kind of particle or particles and fibers, and (ii) net shape forming by injection molding or extrusion, without the use of organic binders.     

大湖之都大型楼盘区墨溪湖引水活水工程设计

工程选择了赣抚平原灌溉总渠为墨溪湖活水水源,并采用浅水湖泊平面二维水动力模型和水质模型模拟计算了引水活化需水水量,根据输水水流流态形式选择了合适的输水管材。为节约用地和避免影响周围景观,中途提升泵房设计为全地下式泵房形式。通过介绍工程设计情况,总结了工程设计特点。     

2Cr13不锈钢阀体的热处理

2Cr13不锈钢阀体除要求耐海水腐蚀外，还要具有良好的力学性能特别是低温（-29℃）冲击韧度。但采用常规调质处理难以使阀体的力学性能达到要求。后采用940℃亚温油淬和650℃高温回火的工艺，阀体的力学性能达到了要求。