共查询到20条相似文献,搜索用时 187 毫秒
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文章分析讨论了以交流位置伺服控制原理实现的交流伺服自动送料装置,可用于货架立柱冷弯成型生产线的在线预冲孔加工工序.也可应用于冲压自动化生产和压力机改造过程中的自动送料装置的设计,该装置系统具有响应速度快、速度精度高、调速范围宽、加减速性能好、鲁棒性强、控制灵活方便、抗干扰能力强、运行稳定可靠等优点. 相似文献
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鉴于以往在钻床上钻削工件时的装夹情况,在工作台上装夹工件,常用由螺旋机构、压板、支柱组成的螺旋压板夹紧装置来夹紧工件,这种方法存在夹紧繁琐,拆装耗时,使用部件多,安全性差等问题。自调式压板体夹紧装置如图1所示的设计,很好的解决了螺旋压板体夹紧装置存在的问题,使用效果好,提高了生产效率。 相似文献
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Gisela Pujol-Vazquez Leonardo Acho Saleh Mobayen Amelia Nápoles Vega Pérez 《Journal of The Franklin Institute》2018,355(10):4077-4096
The main objective of this paper is to drive a rotary inverted pendulum by following a desired navigation instruction. This navigation is commanded by the user through a new electromagnetic device which is allowed to perturb the pendulum from its upright position. This apparatus consists of an electronic magnetic driving circuit to introduce commands and realized via two operated magnetic coils. So, the external programmed magnetic perturbation can be seen as external commandments. Therefore, the control problem statement is solved via a modified regulation control implementation, to maintain the pendulum on its upright position and giving free manipulation of the base of the rotary inverted pendulum. Hence, by using the corresponding H∞-linear matrix inequality technique, a static state controller is designed and tested experimentally so supporting our findings. 相似文献
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文章选择曲柄滑块机构作为喷头工作机构,将喷头固定在滑块上,利用滑块的往复直线运动,带动喷头左右移动,从而实现清洗的目的。介绍了曲柄和连杆长度的确定,并通过对曲柄和连杆的受力分析,计算了曲柄和连杆的横截面积,为满足滑块不同行程的需要,把曲柄设计成了可调节结构。 相似文献
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针对某供热电厂#5机组输灰系统输灰气源压力经常被大幅度拉低、运行人员需频繁调整仓泵进料时间的现象进行深入分析,在输灰顺控逻辑上增加了输灰时间自适应优化,根据该锅炉自身特性成功实现了在机组调峰、煤种改变的情况下输灰系统的高自动化、经济、稳定运行。 相似文献
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财务杠杆是财务管理中的基本名词,如果企业决策者未能深刻领悟其含义和作用机理,将致危机重重。分别从几道简单的实例计算入手,从其结论出发,阐明了对财务杠杆的认识,并对财务和杠杆的运用问题进行了分析。 相似文献
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通过对细棒件小五金的属性研究设计了一种针对细棒五金件的连续计数下料方案。包含了细棒件存储单元、导流阵列单元、细棒件输送单元。通过控制步进电机的脉冲,从而控制下料的个数。同时利用Solidworks软件对设计装置进行装配建模,为机构优化设计提供了可靠的依据,验证了设计的可行性。 相似文献
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针对二级倒立摆系统的快速响应及其稳定和鲁棒控制问题,以直线二级倒立摆为研究对象,在建立其非线性数学模型的基础上,利用极点配置方法设计了滑模变结构控制器。将所设计的控制器应用到二级倒立摆系统,实验仿真表明,该控制策略实现了对二级倒立摆系统的实时跟踪控制,系统具有较好稳定控制和较强抗干扰能力。 相似文献
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J.S. Stecki 《Journal of The Franklin Institute》1981,311(2):93-110
Kinematically constrained motion is generally accepted as a fundamental requirement for a mechanism to function as a power transmitting device. There exists, however, a class of mechanism which although kinematically unconstrained, can, by incorporation of energy storage elements, function as a power transmitter. An example of such a mechanism is the automatic, variable ratio power transmission invented in the early twenties by G. Constantinesco, which generated a lot of interest among the engineering fraternity at the time. A typical device consists of a crank-driven nine-bar mechanism which possesses two degrees of mobility. The single velocity (or torque) source supplies the input power, which is transmitted to the output shaft by means of unidirectional drives. The characteristics of the energy storage element in conjunction with a single velocity (or torque) input and the external load fully determine the dynamic behavior of the device. During operation, the input energy is distributed between the load and the energy storage depending on the requirements of the load. For a given input power and external load, the device will adjust the velocity of the output shaft to absorb that power; i.e., it will operate as an automatic, variable ratio power transmission.This paper concentrates on the formulation of a general bond graph model for the mechanism. The model possesses mixed causality and non-linear structure. Some results of digital simulation of the bond graph model of a particular mechanism are provided. 相似文献
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针对突发事件的突发性和复杂性,提出应对突发事件的法律、财政、传媒、保险等机制,这些应对机制能够全面、系统地预防和处理突发事件,以达到防损减损的作用。 相似文献
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本文从高油价下我国炼油企业现状着眼,通过与国外炼油企业对比,找出我国炼油企业存在的问题,并借鏊国外炼油企业的先进经验,从完善产业链条、调整产业结构、加强资源利用、优化装置结构、提升管理水平和利用信息技术等方面提出了时策和建议. 相似文献