共查询到18条相似文献,搜索用时 62 毫秒
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随着碟刹的使用越来越普及,刹车的可靠性测试显得尤为重要,而国内市场上尚没有针对碟刹的测试系统.针对这一问题,设计了一套自行车碟刹制动距离测试系统.首先建立了自行车的刹车模拟装置,然后在模拟装置上安装了拉力传感器和速度传感器对其进行实时监测,传感器信号由数据采集卡采集并上传至上位机,上位机软件分析数据后下发命令控制模拟装置的刹车过程,并实时显示拉力值、速度值和制动距离等.通过多次制动距离测试,求平均值,确定了碟刹的制动距离,最后进行了试验验证.研究结果表明,该测试系统能够较准确地测量出自行车的制动距离,并且性能稳定,简单易操作,实用性强,具有良好的实际应用价值. 相似文献
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韩锋 《机械工人(热加工)》2007,(11):22-22
2007年高速动车组的成功运行,拉开了中国铁道车辆制造业高速车辆批量生产的序幕,在未来一段时间内,高速车的市场需求和投放将迅速增长,在国内一些主要干线这意味着铁道车辆制造业面临着严峻的挑战和机遇,而作为铁道车辆制造过程中的重要环节的锻造与冲压技术,也面临同样的挑战与发展。 相似文献
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论述了后加减速的原理及进给速度、加减速时间常数、上下程序段之间的矢量夹角对到位精度的影响,给出了数据采样插补应用后加减速时依据矢量夹角控制插补精度的一种方法,并对矢量夹角的计算给出了详细的解析。 相似文献
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就非圆链轮传动过程中每一瞬时链条节线长度进行了研究。建立了链条节线长度计算的数学模型,通过计算机编程进行运算,并用实例验证了数学模型及程序的合理性。 相似文献
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通过滚筒式混匀取料机和桥式双斗轮混匀取料机的混匀效果、机器性能、使用可靠性、制造成本等对比,为相关单位在设备选型时提供参考。 相似文献
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一种新型机动、手动进给传动机构,在传动链起始端都用蜗轮蜗杆副,利用蜗轮蜗杆副反向传动自锁的特点,达到机动进给时自锁手动进给,而手动进给时又自锁机动进给的结果。 相似文献
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针对一个考虑新产品和再造品差别定价的制造商回收闭环供应链,在突发事件干扰两类产品生产成本发生扰动的情况下,研究了集中式决策闭环供应链的应对策略,以及设计可协调突发事件干扰下分散式决策闭环供应链的数量折扣契约问题。研究表明:突发事件发生后,集中式决策闭环供应链的稳定环境下新产品和再造品最优决策的调整方式不仅与两类产品生产成本发生扰动的程度相关,还与两类产品之间的相互替代系数相关;改进的数量折扣契约可通过使系统成员共担突发事件干扰的风险实现分散式决策闭环供应链的协调。通过数值算例验证了所得结论的正确性。 相似文献
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《机电工程》2014,(5):549-567
In order to improve the finishing eeficiency of pneumatic wheel for laser hardening mold, and solve the subtle crack problem of pneumatic wheel caused by high frequency vibration and prolonged pressure during the long time finishing, a composite pneumatic wheel of SBR reinforced by PPTA-pulp was designed. Through the axial tensile test of the standard sample, the stress-strain relationship and the elastic modulus of composite pneumatic wheel were received. Using ANSYS/LS-DYNA the modal and strees distribution of composite pneumatic wheel were simulated, the distribution curve of the modal frequency and contact stress were received. According to the finishing experiment of laser hardening molt!, the correctnees of the simulation was verified. The results show that the frequency of the composite pneumatic wheel has been improved significantly, and the strees distribution is uniform, so as to improve the finishing eeficiency for mold with high hardnees and wear resistance. If adding 3.3% PPTA-pulp, both the profile ability and the strees distribution would be preferable. That could be beter for the laser hardening mold finishing. [ABSTRACT FROM AUTHOR] 相似文献
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A. G. Mamalis N. G. Bilalis V. S. Ganovsky 《The International Journal of Advanced Manufacturing Technology》1992,7(1):44-50
The integration of metal forming and metal removal operations in a single flexible manufacturing cell will advance further
the area of application of the flexible manufacturing system and will contribute to the flexible automation of traditionally
high volume applications. Forming operations will first be employed to achieve a near net shape of the components, so that
only a minimum of subsequent machining operations will be required to manufacture the final forms. The efficient use of these
systems depends considerably on the proper design of the system. A simulation model written in the PASCAL language is presented,
capable of simulating a mixed type FMC. With the aid of this model the effect of the batch size and the carrying capacity
of the pallets on utilisation of the machine tool and the throughput times of the orders is examined. 相似文献