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在硬件的升级换代过程中,一批工作站上更换下来的大屏幕彩显经改装后成为标准的VGA显示器,本文介绍了这类显示器几种常见故障及两例特殊故障的现象、原因及维修的方法。  相似文献
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针对传统Stewart结构6维力传感器性能的不足,设计并研制了一种双层预紧式6维力传感器,并进行了精度分析与实验研究.首先,介绍了该6维力传感器的结构特点,基于螺旋理论建立了其数学模型以及预紧力的数学描述形式.为了提高传感器的测量精度,在分析预紧支路结构的基础上,通过增大预紧力来降低由于预紧支路结构变形产生的误差.其次,对不同预紧力下预紧支路的结构变形进行了有限元仿真.最后研制并开发了6维力传感器样机和标定系统,进行了不同预紧力情况下的标定实验.通过增大预紧力,传感器的最大Ⅰ类误差和Ⅱ类误差分别由满量程的2.73%、2.43%降低到0.41%、0.64%.实验结果表明,增大预紧力有效地降低了预紧支路变形带来的测量误差,提高了传感器的测量精度,从而验证了理论分析与仿真的正确性.  相似文献
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为探究某擦窗机悬挂结构的合理性,在AIP中创建其悬挂轨道的三维参数化特征模型,并根据轨道的结构、材料和特定工况受力等边界条件,建立悬挂系统的有限元模型,模拟计算2种有代表性的偏栽荷工况受力情况,得到悬挂轨道的三维应力分布、结构变形和安全因数.根据工程设计要求和初步分析结果,在保持边界条件和载荷条件不变的情况下,快速更新轨道结构参数,并通过比较分析确定塔楼悬挂轨道的最佳断面参数.该轨道及其固定间距、滑车滚轮和导向轮等构件均满足设计安全要求.  相似文献
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针对不同曲面上QR码变形多样化、识别率低的问题,考虑到极限学习机(ELM)对大量数据的快速分类能力,提出了一种基于ELM的多结构变形QR码分类校正算法。在欧式距离量化变形特征后,运用ELM算法把变形结构分为平面变形、半曲面变形和全曲面变形三类,并利用不同分类系数改进QR码坐标透视变换算法,得到校正坐标值。实验结果表明,此方法不仅提高了QR码在曲面上的校正准确率,而且通过分类提高了曲面变形和平面变形QR码的校正速度。  相似文献
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微米尺寸驱动结构广泛应用于微机电系统(MEMS)和集成电路等微/纳米系统中。由于这些微米尺寸驱动结构的几何尺寸和其微结构尺寸均在微米至纳米范围,它们的弹性、塑性性能及其变形行为具有明显的尺度效应。简要概述了近年来国内外有关微米尺寸驱动结构的弹性性能和变形特性尺度效应的研究情况,介绍了高阶理论的发展和塑性应变理论与微极理论在尺度效应分析中的应用,并对MEMS今后需要重点研究的方向进行了展望。  相似文献
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The crashworthiness analysis of road vehicles requires detailed data of the vehicles that the automotive manufacturers are, generally, unable to release due to commercial or legal restrictions. In the development of passive safety subsystems or substructures, the overall crash response of a vehicle model used to support it, must mimic that of the real vehicle; if this exists, regardless of any particular constructive detail of its structure provided that it is not located in the vicinity of such subsystem. This work proposes a methodology for the development of multibody models of road vehicles, for passive safety analysis, which include all general structural and mechanical features of real vehicles and start by exhibiting impact dynamic responses similar to the top of line vehicles. These vehicle models, designated as generic, do not require the knowledge of most of the particular details of the design of the real vehicle, which the manufacturers are unable to release, but can be adjusted to have crash responses similar to those of the real vehicle. Based on an existing finite element model of a car, which has all constructive features of vehicles of the chosen class, a multibody model is built applying the plastic hinge approach. By using a selected number of crash scenarios, defined in international standards such as the EuroNCAP, selected parameters of the vehicle multibody model are adjusted to ensure a good correlation between its impact responses and those of the finite element model. The crash responses are measured in terms of structural deformations, velocities and accelerations, occupant injury measures and structural energy absorption capabilities. Assuming that the plastic hinge constitutive equations of the multibody model are not exactly known, their parameters are used here as the multibody vehicle model that are adjusted. The methodology proposed is demonstrated by its application to the identification of the vehicle multibody model of a large family car for which the reference vehicle is available as a detailed finite element model.  相似文献
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为研制功率为300 W,频段为1.2~1.4 GHz的大功率合路器,在传统Wilkinson合路器的基础上,基于ANSYS多物理场仿真,利用电磁场、热特性和结构耦合仿真,分析大功率合路器的热量分布和结构变形情况。对合路器进行结构优化,保证在电气性能不恶化的情况下减少热量和变形,提高Wilkinson合路器的耐高功率性能。  相似文献
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