共查询到19条相似文献,搜索用时 140 毫秒
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基于Patran和MSC Nastran的现代飞机舱门主结构校核方法 总被引:1,自引:0,他引:1
介绍一种现代飞机舱门结构强度分析的方法. 采用Patran和MSC Nastran进行有限元建模和计算,结合自主研发的舱门主结构分析系统进行多工况批处理,高效完成舱门的安全工况及单一失效工况下的强度校核,为舱门设计提供重要的强度依据. 相似文献
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安全阀是保障石油化工设备正常运行的重要绀成部分,本文以目前广泛采用的AP1581标准为基础,建市安全阀的失效分析系统.该系统在计算机理和界向交互方式上改进原标准,可以根据工厂设备和安全阀管理数据,分析安伞阀的开启失效和泄漏频率,为提高石油化工牛产的安全性和可靠性提供重要的分析依据. 相似文献
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对聚乙二醇生产装置的用能问题进行了研究,重点讨论了反应热的回收利用和换热系统的优化.采用时间分段法分析了装置的用能特征,针对间歇操作的特点,提出了利用中间热储罐进行间接热回收的改进工艺,并通过绘制间歇过程冷热物流组合曲线确定了中间热储罐的温位及可回收的热量.研究表明,应用本文方法可实现反应热的回收,工艺能耗显著降低,节能达69%以上. 相似文献
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无人机伞降定点回收技术研究 总被引:2,自引:0,他引:2
针对无人机伞降定点回收传统方法中存在精度低、鲁棒性差的缺点,总结并研究了需要解决的三个关键问题:机伞系统建模,风场估计和定点回收策略,重点研究了其中的建模问题和控制策略,提出了系统解决方案。在机伞系统建模中,引入了弹性伞绳模型,从而可以正确反映伞降过程中机体姿态和伞绳拉力;在风场估计中,使用卡尔曼滤波进行风速和风向的估计;在回收策略中,着重考虑了对于风场扰动的鲁棒性和回收策略的工程可实现性。在考虑风场不确定性和随机导航误差的情况下,将提出的方案应用于某小型无人机,进行蒙特卡洛仿真试验,得到伞降圆概率误差为8.23m,证明该方案相对于传统方法鲁棒性和回收精度都有大幅提高。 相似文献
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针对在实际工作中提升机过卷事故导致的立体车库提升系统的不安全问题,分析了提升系统的薄弱环节,并对其进行结构优化,提出一种新的轴承座安装方式;为完善立体车库提升机过卷缓冲系统,设计了一种过卷缓冲装置的液压系统,利用AMESim建立了系统仿真模型,分析溢流阀不同开启压力下过卷缓冲装置的性能,确定了溢流阀较理想的开启压力为8 MPa,并得到较理想开启压力下的被提升装置的速度变化曲线和缓冲油缸压力曲线.结果表明,当溢流阀开启压力为8 MPa时,缓冲时间为1.5s,缓冲位移为0.52 m,振动幅度为0.1m,过卷缓冲装置吸收了被提升装置的液压冲击,降低了被提升装置在终点的振动幅度,达到提升系统过卷保护的目的. 相似文献
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利用MSC Nastran,MSC Adams,MSC Fatigue联合分析舱门在风载荷作用下的强度.用MSC Nastran生成舱门的柔性体(.MNF)文件与.op2文件;将柔性体导入MSC Adams中替换刚性体舱门,仿真并输出载荷时间历程(.DAC)文件;在MSC Fatigue中利用载荷时间历程(.DAC)文件与.op2文件进行疲劳强度分析,得到该舱门在该风载作用下的疲劳强度. 相似文献
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基于EMD-ARIMA模型的地铁门传动系统早期故障预测 总被引:1,自引:0,他引:1
地铁门夹紧力峰值数据在一定程度上可以反映其传动系统的退化状态.基于此,本文运用研发的数据采集系统对新上线地铁门的夹紧力进行实时地采集、存储、显示和查询.分别采用ARIMA模型与EMD-ARIMA模型对夹紧力峰值的均值和标准差随累积运行时间的变化趋势进行预测,依据预测结果确定地铁门传动系统发生早期故障的概率.通过两种模型预测对比结果表明,EMD-ARIMA模型可以较好地预测地铁门夹紧力峰值的变化趋势,这种改进的预测方法可以对处于调试期车门退化状态的预测提供新思路. 相似文献
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Based on a lifetime of experience, people anticipate the forces associated with performing a manipulation task. In contrast, most robots lack common sense about the forces involved in everyday manipulation tasks. In this paper, we present data-driven methods to inform robots about the forces that they are likely to encounter when performing specific tasks. In the context of door opening, we demonstrate that data-driven object-centric models can be used to haptically recognize specific doors, haptically recognize classes of door (e.g., refrigerator vs. kitchen cabinet), and haptically detect anomalous forces while opening a door, even when opening a specific door for the first time. We also demonstrate that two distinct robots can use forces captured from people opening doors to better detect anomalous forces. These results illustrate the potential for robots to use shared databases of forces to better manipulate the world and attain common sense about everyday forces. 相似文献
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Quality control in liquid transfer operations can eliminate false assay results due to transfer failures, monitor the stability of laboratory equipment, provide baselines for continuous improvement, and enable automatic recovery actions for a number of fault conditions. This paper describes the work done to add real-time quality control capability in liquid transfer operations on a closed-loop controlled MEMS based liquid transfer device.Real-time data acquisition enables the interpretation of system variables. Using fuzzy logic as a decision support tool, an overall quality metric and failure mode is deduced from these variables for each channel per operation. Detection of ordinary fault conditions like clogged tips or unexpected empty source wells can activate automatic recovery actions without human intervention, leading to 24/7 utilization of an automated laboratory system. Exported quality data can be used for bio-informatics data analysis as well as documentation for regulatory agencies. 相似文献
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随着计算机技术的不断发展,计算机系统在安全攸关领域得到了广泛应用,其中的软件系统正逐渐成为重要的使能部件.在计算机系统中,设备驱动程序扮演了软件与硬件设备之间桥梁的角色.由于与计算机平台、操作系统、设备3个方面同时关联所导致的复杂性,设备驱动程序的开发难度大、成本高,程序中所存在的错误和缺陷常常导致系统失效,在安全攸关领域造成不可挽回的损失.以设备驱动程序可靠性和正确性保障为目标,分别从故障的隔离与恢复、正确性分析和验证、设计建模与复杂性控制这3个方面对当前相关方法和技术进行分析,为开展进一步深入的研究工作打下基础. 相似文献
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Many software-based building processes require digital building models. Since the building stock does not have sufficient data in this regard, the demand for Scan-to-BIM processes is increasing. In this paper we present a system for the reconstruction of ‘as-built’ BIM content of house interiors based on the Google Tango technology. The strength of our approach is the use of low-cost mobile scanning devices and a client-server system that allows for a real-time collaborative scanning and reconstruction of indoor scenes. We developed a server application that continuously aggregates scan data of multiple scanning devices (clients) and applies the data stream to a real-time post-processing pipeline to reconstruct rooms, walls, doors and windows. The reconstruction result is then distributed to all clients, where it is visualized in real time. The collaborative workflow and real-time data processing make our system especially useful in situations that are time-critical and require concurrent collection and processing of data. One of our targeted use cases therefore is the model generation for crime scene documentation. The effectiveness of our approach was demonstrated on three test sites. Our results compare well to other state-of-art methods regarding the reconstruction of walls, but they also revealed potential for improvement regarding the detection of doors and windows in occluded and cluttered environments. 相似文献