共查询到20条相似文献，搜索用时 494 毫秒
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本文介绍了适用于国内企业数控机床的硬件联网方案,可用一台计算机同时与多达255台具有RS232串口的数控机床进行实时数据通信,并实现数控代码的远程传输与接收,为企业网络化制造、自动化生产奠定良好的底层技术基础。系统已在企业成功应用并取得良好效果。 相似文献
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数控技术作为未来先进制造技术的核心内容之一,正在朝着开放化,网络化,柔性化和智能化方向发展,数控装备产品的设计制造和应用开发都日益显示出基于开放接口标准的模块形态.正是针对于这一数控技术培养模式的局限性,建立了一个针对于整个数控技术应用开发领域一体化实验平台,采用组件和模块的思想建立了一个集成的设计开发环境,实现从数控装备产品规划,方案选择,运动算法和人机交互等各个环节. 相似文献
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随着计算机技术、互联网技术的不断深入发展与应用,网络化的数控机床成为现代数控机床的发展趋势,然而我国相应的机制、机电等专业人才培训相对滞后。在我国的传统教学中,数控操作与编程序操作都需进行实际操作,这需要学校加大设备的投入。而现阶段数控教学一般采用单机教学,教学系统的设计不能满足数控机床系统网络化发展需求。作者就网络时代数控教学过程中存在的问题进行分析,如何建立网络化教学系统提出自己的见解,以供参考。 相似文献
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基于ASP的网络化制造系统实施模式 总被引：1，自引：0，他引：1
网络化制造系统能够提高企业竞争力,促进企业间协作。当前,基于应用服务提供商服务平台构建网络化制造系统已经成为研究热点。文章针对我国制造业信息化程度较低的现状,结合企业网络化制造的ASP系统的开发,分析了ASP应用服务的特点,总结了网络化制造的现状,分析了系统的主要功能,探讨网络化制造的关键技术,最后给出了系统的运行模式,这些内容对网络化制造企业的成功建立提供了重要理论依据和技术支持。 相似文献
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当前数控加工技术逐步取代了普通机械被数控机,成为现代制造技术的基础。在数控编程的过程中,确定刀具的切削用量不但影响被加工零件的质量,同时决定着机床功效的发挥。本文首先简单介绍数控加工中切削的特点,然后对切削用量的合理选择原则进行探讨。 相似文献
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数控加工是我国制造业基础工业的主要生产形式,数控加工技术也已经成为我国的基础工业技术。在现代社会经济发展的需求推动下,在网络信息技术的支持下,数控加工技术与网络信息技术的融合趋势愈发明显,数控加工的云制造成为数控加工技术发展的重要方向。本文将立足数控加工技术的实际,从云制造的角度出发,结合数控加工服务的生产实际,对面向云制造的数控加工服务关键技术进行简要分析。 相似文献
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Jinliang Liu Yuda Wang Lijuan Zha Huaicheng Yan 《Journal of The Franklin Institute》2019,356(16):9451-9473
This paper investigates the event-based control for networked T-S fuzzy cascade control systems with quantization and cyber attacks. In order to solve the problem of limited communication resources, an event-triggered scheme and a quantization mechanism are adopted, which can effectively reduce the burden of communication and save the network resources of the system. By considering the influence of cyber attacks, a newly quantized T-S fuzzy model for networked cascade control systems (NCCSs) under the event-triggered scheme is established. By using the Lyapunov stability theory, sufficient conditions guaranteeing the asymptotical stability of networked T-S fuzzy cascade control systems are obtained. In addition, the controller gains are derived by solving a set of linear matrix inequalities. Finally, a numerical example is presented to verify the validity of the proposed method. 相似文献
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Consensus of networked multi-agent systems via the networked predictive control and relative outputs
This paper investigates the consensus problem of discrete-time networked multi-agent systems (DNMASs) with a directed topology and communication delay, where exact state and output of each agent are not measured, and yet output differences between agent and its neighboring ones (relative outputs for short) are available. Based on the networked predictive control scheme and relative output data, a novel protocol is proposed to overcome the effect of delay on the consensus actively. Moreover, for the DNMASs with a fixed topology and constant communication delay, delay-independent necessary and/or sufficient conditions of achieving consensus are obtained, which reveal that the essence of dominating the consensus is agents' dynamics and communication topology. Simulation results further demonstrate the effectiveness of theoretical results. 相似文献
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基于科学交流的网络文献交流模式分析 总被引：3，自引：1，他引：3
科学交流的环境发生了巨大变化，传统的文献交流模式已经不能完全适应现代科学交流的需要，研究网络环境下的文献交流模式显得十分有现实意义。文章在论述科学交流实质的基础上，针对当前网络化的现状，提出了适合当前科学文献交流形式的网络文献交流模式——复合交流模式，并就此进行探讨。 相似文献
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在阐释复合图书馆和信息传播学的概念、影响信息传播的技术因素、信息传播要素的基础上,引入经典5W模式和网络化传播模式,从复合图书馆的资源组织角度和用户服务角度对复合图书馆信息传播模式进行研究,进而建立基于用户信息服务传播模式。 相似文献
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This paper deals with the interval type-2 (IT2) fuzzy tracking control problem for nonlinear networked control systems with unreliable communication links. The plant is described by an IT2 fuzzy system, and the IT2 fuzzy sampled-data tracking controller is designed under the unreliable communication mechanism. By utilizing the Lyapunov theory, the stability demonstration is carried out under the mathematical expectation. The characteristics of membership functions are applied to enhance the stability of the IT2 fuzzy system. With the more sampling information used in the stability analysis, the less conservative sufficient condition is provided based on which a networked tracking controller is designed to ensure the anticipant tracking performance. Finally, the efficiency and the merits of this paper are shown by two simulation examples. 相似文献
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《Journal of The Franklin Institute》2022,359(7):2857-2885
From an interdisciplinary perspective, the event-triggered scheme, the state observer, and the nonlinear disturbance observer are introduced in a robust tracking control to study the networked electro-hydraulic servo system control problems with digital communication challenge, sensor installation restricted problem, matched modeling uncertainties, and mismatched disturbances. Control packets are likely to be delayed or even lost in the networked control system when the communication medium is shared by multiple nodes and the available communication bandwidth is limited. Therefore, it is necessary to save communication resources. To improve the control performance and the efficiency of the network resource utilization, the event-triggered scheme is introduced. Specifically, the practical application of the event-triggered scheme in an actual electro-hydraulic servo system is a breakthrough in this paper. In addition, to obtain the real-time states of the unmeasurable system and compensate for both matched disturbances and external disturbances simultaneously, the state observer and the nonlinear disturbance observer are collaboratively designed. Finally, to evaluate the control performance of the designed controller, the related comparative experiments are carried out in an actual system. The results show that theoretical analysis and experimentation are cross verified. 相似文献
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Xi-Sheng Zhan Ling-Li Cheng Jie Wu Huai-Cheng Yan 《Journal of The Franklin Institute》2019,356(12):6401-6418
This paper investigates the modified tracking performance limitation of the networked time-delay systems with two-channel constraints. We consider both the white Gaussian noise and packet dropout constraints in the communication channels. In the plant, the non-minimum phase, unstable poles and time-delay are considered. The modified tracking performance limitation expressions will be achieved using the co-prime factorization and the spectral decomposition technique, and the two-parameter controller is adopted. The results show that the modified tracking performance limitation is related to the intrinsic properties of the given plant, including the non-minimum phase zeroes, the unstable poles and the time-delay. Furthermore, the network communication parameters, e.g. the white Gaussian noise, the packet-dropouts probability and the modified factor affect the modified tracking performance limitation of the networked time-delay systems. Finally, some particular examples are provided to illustrate the efficiency of the proposed method. 相似文献
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In this paper, the state estimation problem for discrete-time networked systems with communication constraints and random packet dropouts is considered. The communication constraint is that, at each sampling instant, there is at most one of the various transmission nodes in the networked systems is allowed to access a shared communication channel, and then the received data are transmitted to a remote estimator to perform the estimation task. The channel accessing process of those transmission nodes is determined by a finite-state discrete-time Markov chain, and random packet dropouts in remote data transmission are modeled by a Bernoulli distributed white sequence. Using Bayes’ rule and some results developed in this study, two state estimation algorithms are proposed in the sense of minimum mean-square error. The first algorithm is optimal, which can exactly compute the minimum mean-square error estimate of system state. The second algorithm is a suboptimal algorithm obtained under a lot of Gaussian hypotheses. The proposed suboptimal algorithm is recursive and has time-independent complexity. Computer simulations are carried out to illustrate the performance of the proposed algorithms. 相似文献
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《International Journal of Information Management》2017,37(6):520-538
This study applied the concept of online consumer social experiences (OCSEs) to reduce online shopping post-payment dissonance (i.e., dissonance occurring between online payment and product receipt). Two types of OCSEs were developed: indirect social experiences (IDSEs) and virtual social experiences (VSEs). Two studies were conducted, in which 447 college students were enrolled. Study 1 compared the effects of OCSEs and non-OCSEs when online shopping post-payment dissonance occurred. The results indicate that providing consumers affected by online shopping post-payment dissonance with OCSEs reduces dissonance and produces higher satisfaction, higher repurchase intention, and lower complaint intention than when no OCSEs are provided. In addition, consumers’ interpersonal trust (IPT) and susceptibility to interpersonal informational influence (SIII) moderated the positive effects of OCSEs. Study 2 compared the effects of IDSEs and VSEs when online shopping post-payment dissonance occurred. The results suggest that the effects of IDSEs and VSEs on satisfaction, repurchase intention, and complaint intention are moderated by consumers’ computing need for control (CNC) and computer-mediated communication apprehension (CMCA). The consumers with high CNC and low CMCA preferred VSEs, whereas the consumers with low CNC and high CMCA preferred IDSEs. The effects of VSEs and IDSEs on consumers with high CNC and CMCA and those with low CNC and CMCA were not significantly different. 相似文献