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天轮是提升系统中主提升绳导向的重要环节。天轮衬垫的使用严重后果影响着矿井提升系统的运行。由于天轮在长年的运行中,天轮衬垫磨损严重,需定期更换,本工艺针对以往更换天轮衬垫的方法进行改进和总结,利用现代化工具进行施工,不仅减少了施工人员的工作强度,更减少了高空作业的时间,实践证明此方法在高质量地完成检修任务前提下,快速高效地完成施工任务,为矿方减少了停产检修的时间,创造了巨大经济效益,更进一步地巩固了安全、快速、高效施工的概念。 相似文献
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针对偏远地区的电力传输高塔巡检周期长和因无法及时地获知倾斜、倒塌等突发情况而造成巨大损失等问题,设计了一种基于MEMS加速度传感器＋GSM＋C8051F021构架的远程电塔姿态测量仪。利用C8051F021和MEMS加速度传感器组成的倾角测试仪安装在电力传输高塔上,实时地获取倾斜角度。通过GSM子模块将时间、倾角、位置等信息发送至短信平台为电力监控部门提供巡检维修依据。 相似文献
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本文提出五轴机床转台偏摆角误差的一种检测方法。为真实地反映机床加工时转台摆动轴的运动误差,采用切削实验的方法,结合误差敏感方向矢量的概念,对五轴机床转台偏摆角运动误差予以分离。采用米克朗立式加工中心作为实验验证对象,对试验切工件进行采样测量与拟合,得到工件在敏感方向上的加工误差,并建立起工件加工误差和转台摆动轴运动误差之间的对应关系,从而推导出转台摆动轴的偏摆角误差。 相似文献
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管道内钢球运动状态测量系统,主控部分为STC89C52单片机并配以12864B液晶显示模块,利用两个金属感应接近开关非接触式实时监测钢球在管道内的运动状态。传感器的信号接入单片机的外部中断端口,利用单片机内部定时器进行计时,综合利用力学运动公式推理计算,实现对钢球的运动方向、投入钢球的个数、钢球在管道内摆周期及管道倾斜角度的测量。整个系统硬件电路结构简洁、调试方便,即使在两个传感器间距小于20mm的情况下也能实现了准确测量。 相似文献
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本文针对HMC1023磁阻传感器的特点,讨论了该传感器对多通道宽磁场测量系统的设计问题。本文利用仪用放大器和采样保持器实现了多通道实时采样,利用PGA可以对传感器输出的放大倍数自动调节,从而使其满足宽磁场范围的准确测量。本文也讨论了传感器的输出在PC机上的实时显示问题。 相似文献
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红外线技术的发展和应用,已经为大家熟知,这种技术已经在现代科技、国防、工业、农业等领域获得了广泛的应用。红外线传感器是利用物体自身所产生的射线这一特性,实现自动测量的一种传感器。本文主要介绍了红外传感器的应用,它是一种非常有应用潜力的传感器,文章通过介绍红外传感器的定义、工作原理,最后引出红外传感器在现实生活中的应用。 相似文献
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《Journal of The Franklin Institute》2022,359(18):10392-10419
This paper proposes a high-precision three-dimensional nonlinear optimal computational guidance law in the terminal phase of an interceptor that ensures near-zero miss-distance as well as the desired impact angle. Additionally, it achieves these ambitious objectives while ensuring that the lead angle and lateral acceleration constraints are not violated throughout its trajectory. This ensures (i) the target does not escape the field of view of its seeker at any point in time (a state constraint) and (ii) it does not demand unreasonable lateral acceleration that cannot be generated (a control constraint). The guidance problem is formulated and solved using newly proposed Path-constrained Model Predictive Static Programming (PC-MPSP) framework. All constraints, both equality and inequality, are equivalently represented as linear constraints in terms of the errors in the control history, thereby reducing the complexity and dimensionality of the problem significantly. Coupled with a quadratic cost function in control, the problem is then reduced to a standard quadratic optimization problem with linear constraints, which is then solved using the computationally efficient interior-point method. Results clearly demonstrate the advantage of the proposed guidance scheme over the conventional Biased PN as well as the recently proposed GENeralized EXplicit (GENEX) guidance techniques. Numerical simulations with variation in initial conditions and Monte–Carlo simulations with parametric uncertainty demonstrate the robustness of the proposed guidance scheme. 相似文献
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The Small Angle X-ray Scattering 《中国科学院院刊(英文版)》2007,21(4):201
The Small Angle X-ray Scattering (SAXS) Station with the Beijing Synchrotron Radiation Facility (BSRF) was put into operation at the CAS Institute of High Energy Physics in July, 2007. 相似文献
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《Journal of The Franklin Institute》2023,360(5):3618-3632
A filtering algorithm with a control strategy is proposed to estimate the target state. Unlike the existing literature, the control strategy adopted is based on asynchronous aperiodically intermittent control, which is more general and universal due to the control strategy of each network node being different. Moreover, a Lyapunov function is proposed, which can handle asynchrony for asynchronous aperiodically intermittent control and simplify the proof process. Using the Lyapunov method and the graph theory, we give sufficient conditions to obtain a criterion of exponentially bounded in the mean square about the filtering algorithm and target. Finally, two numerical examples are given to verify the effectiveness of our results. 相似文献