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根据数控系统的设计原理,数控机床每次开机后都必须先回参考点,才能进行相应的操作。通过介绍西门子802S数控机床回参考点的作用及其工作原理,举例说明数控机床在回参考点的过程中出现的故障报警,提出了排除故障的步骤和措施。 相似文献
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In the IEEE g02. 11 protocol, the adoption of the exponential backoff technique leads to throughput performance strongly dependent on the initial contention window size and, most importantly, on the number of contending stations considered in the network. This paper proposes a simple but accurate method to dynamically estimate the number of contending stations in a wireless local area network ( WLAN ). Based on estimation, all the mobile stations dynamically adjust the initial contention window in medium access control ( MAC ) layer to avoid collisions. The simulation results show that the proposed algorithm can achieve efficient channel utilization, higher system throughput, and better fairness performance. 相似文献
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曹明 《南宁职业技术学院学报》2008,13(5):95-97
根据数控系统的不同,NC程序的格式和内容也不同这一原理,在MasterCAM9.0默认的后置处理程序的基础上,通过修改和重新设置,可以得到适宜SINUMERIK802D数控车床系统专用的后置处理程序,解决在MasterCAM编程中不能直接输出符合西门子数控车床NC程序的问题。 相似文献