Wirtinger-based multiple integral inequality for stability of time-delay systems

Note that the conservatism of the delay-dependent stability criteria can be reduced by increasing the integral terms in Lyapunov–Krasovskii functional (LKF). This brief revisits the stability problem for a class of linear time-delay systems via multiple integral approach. The novelty of this brief lies in that a Wirtinger-based multiple integral inequality is employed to estimate the derivative of a class of LKF with multiple integral terms. Based on these innovations, a new delay-dependent stability criterion is derived in terms of linear matrix inequalities. Two numerical examples are exploited to demonstrate the effectiveness and superiority of the proposed method.     

浅谈住宅小区电气规划设计要点

本文阐述了住宅区的低压配电干线合理规划的原则和要点,建议把室外管线综合的工作放在建筑方案设计初期.并介绍了住宅区的电气规划的工作内容及常用方法,从而解决了施工后期经常出现的管线布置困难的问题.     

基于PLC和触摸屏的车身总装夹具控制系统设计

车身总装工艺是白车身生产的关键工艺,论文用程序自动控制代替手动气压控制,确保达到车身总装质量和生产效率的要求.该设备的控制系统是以PLC控制技术为核心,以触摸屏为人机操作界面,采用二者配合控制实现了车身总装夹具的控制要求.设备已经投入生产,运行结果表明:该系统在降低了设备成本的同时,有效的缩短了生产周期,对其它类产品设计有一定参考价值.     

家庭洗涤中织物运动测量方法探讨

家庭洗涤中织物的运动过程与洗后性能直接相关。针对洗涤运动特点,围绕织物家庭洗涤时的受力分析、动作分解、速度监测和轨迹跟踪四个方面,得出织物温态性能测量技术、高速摄像技术、传感器技术和电子示踪技术在洗涤运动测量中的研究应用;同时指出未来可以从测量设备的适用性和稳定性、织物含水率的可控性、动作分解原则的可靠性等技术难点深入探索,为实现高效、环保、智能化的家庭洗涤提供更全面的理论依据和更有效的技术支持。     

卫生间硅酸钙板轻质隔墙上瓷砖饰面系统应用技术研究

对卫生间硅酸钙板轻质隔墙上采用瓷砖饰面系统进行了相关应用性研究，讨论了硅酸钙板厚度、界面处理、防水处理以及粘贴材料等对系统粘结力的影响，提出了在硅酸钙板轻质墙体上进行瓷砖饰面的可靠施工方案。     

Effect of wear behaviour of single mono- and poly-crystalline cBN grains on the grinding performance of Inconel 718

Polycrystalline cubic boron nitride (PcBN) grains were fabricated by combining the monocrystalline cBN (McBN) nanoparticles and inter-abrasive ceramic materials via high temperature and pressure techniques. Grinding performance of Inconel 718 with single McBN and PcBN grains, including grinding force, force ratio, ground surface quality was investigated. Characterization of the wear morphology evolution of worn grains and scratches of PcBN grains were discussed. In addition, the fracture behaviour of PcBN grains was evaluated as the varying of the undeformed chip thickness. Results show that PcBN grains have the smaller grinding force and force ratio, more stable grain wear rate in comparison to McBN grains. Additionally, the better wear-resistance and grinding performance owing to its multi-cutting edges structure in terms of the grain wear morphology evolution were achieved for PcBN grains regardless of the undeformed chip thickness.