共查询到20条相似文献,搜索用时 137 毫秒
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多层的纤维缠绕复合材料结构中,各个单层间具有不同的纤维铺设角,呈现各向异性的材料特性,在进行有限元分析时,必须对材料的材料特性进行处理变换。根据基本力学方程,对不同缠绕方向的纤维层材料,把不同材料坐标系下的特性参数等效变换到统一坐标系。并利用ANSYS软件对层合结构进行有限元分析,结果表明此转换是可行的。 相似文献
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基于超声导波的压力容器健康监测研究的第三部分,主要考察所研究的健康监测技术在纤维缠绕压力容器损伤定位中的应用。开展纤维缠绕压力容器的疲劳和打压爆破试验,设计远程在线监测系统以实时获取不同工况中纤维缠绕压力容器损伤定位结果。在打压和疲劳试验过程中,采集压力容器在不同状态中的导波信号,并分别测量金属内胆和复合材料层的应变变化,建立导波幅值与压力容器疲劳状态和受压状态之间的关联。开展纤维缠绕压力容器在打压爆破过程中的损伤定位,研究疲劳对损伤定位精度的影响规律。结果表明,在疲劳试验中,应变片能够连续记录并反映压力容器的应变状态,但疲劳周期随残余应变的变化趋势不明显,而导波幅值随疲劳周次的增加而线性下降;对经过5 700周疲劳和未经过疲劳的纤维缠绕压力容器,导波幅值随着其内部压力的增加而线性下降,而应变值随着压力的增加线性增加,二者的对应关系可用于判定纤维缠绕压力容器的受压状态;利用所研发的在线监测系统可以远程获取纤维缠绕压力容器损伤位置信息,5700周的疲劳在很大程度上影响定位精度,而未经疲劳试验的压力容器的损伤定位误差较小。 相似文献
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J.C. Choi S.Y. Jung C. Kim 《The International Journal of Advanced Manufacturing Technology》2004,24(11-12):781-788
Fibre reinforced composite material is widely used in multi-industrial fields where weight reduction of the infrastructure is required because of its high specific modulus and specific strength. Using this material has two main merits. One is to cut down energy use by reducing weight and the other is to prevent explosive damage preceding the sudden burst generated by the pressure leakage condition. Therefore, pressure vessels using this composite material in comparison with conventional metal vessels can be applied in fields such as the defence industry, aerospace industry and rocket motor casings where light weight but resistance to high pressure are demanded. In this paper, a standard interpretation model for nonlinear finite element analysis of E-glass/epoxy filament wound around composite pressure vessels receiving an internal pressure is developed by using ANSYS, general commercial software that has been verified as accurate, and useful characteristics of the solution are based on Auto LISP and ANSYS APDL. Both the pre-processor for exclusive analyses of filament wound composite pressure vessels and the post-processor that simplifies the results of this analysis have been developed to help the design engineers. 相似文献
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The Tiber reinforced composite material is widely used in the multi-industrial field because of their high specific modulus
and specific strength. It has two main merits which are to cut down energy by reducing weight and to prevent explosive damage
proceeding to the sudden bursting which is generated by the pressure leakage condition. Therefore, Pressure vessels using
this composite material can be applied in the field such as defence industry and aerospace industry. In this paper, for nonlinear
finite element analysis of E-glass/epoxy filament winding of composite vessel subjected to internal pressure, the standard
interpretation model is developed by using the ANSYS with AutoLISP and ANSYS APDL languages, general commercial software,
which is verified as useful characteristic of the solution. Among the modules of the system, both the process planning module
for carrying out the process planning of filament wound composite pressure vessel and the autofrettage process module for
obtaining higher residual stress will minimize trial and error and reduce the period for developing new products. The system
can serve as a valuable system for experts and as a dependable training aid for beginners. 相似文献
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This paper introduces fiber Bragg grating (FBG) based on a fiber optic grating sensor developed to be embedded on mechanical
equipment for digital monitoring and health diagnosis. The theoretical and experimental researches on the new-style FBG sensor
(FBGS) technology, high-speed demodulation, and data transmission are discussed. The transmission characteristics between
the FBG and the detection interface, modeling and compensation method for online distributed multi-parameter digital monitoring
and methods for data processing, synchronous sampling, and long-term dynamic digital monitoring using embedded technology
are also presented. The acquired information by an FBGS can be used for the optimization of maintenance schedules and refinement
of mechanical equipment design. It is a challenge to gather real-time data from components working at high speed and in a
severe environment of high temperature, high pressure, and high rotation speed. Currently, there are no sensors or technologies
available for digital monitoring and health diagnosis under this rigorous situation for use in mechanical engineering operation
safety. As a result, this paper introduces an online distributed and integrated digital monitoring system and health diagnosis.
The new principle and new method will contribute to modern measurements in science and technology, mechanical engineering,
and large mechanical equipment operation safety. 相似文献
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压力、温度和湿度集成传感器具有体积小、成本低和可批量生产等优点,在环境监测和工业控制等领域应用广泛。基于微机电系统(MEMS)技术,本文设计和制作了一种尺寸为5.5 mm×3.5 mm×0.8 mm的高精度压力、温度和湿度集成传感器。该集成传感器由SU-8真空粘合技术制作的铂压阻压力传感器,铂电阻温度传感器和电容式湿度传感器组成。介绍了该集成传感器的设计思想、结构和制备过程,给出了实验和测试方法。结果表明,压力传感器的精度优于0.05%;温度传感器的精度为0.3%;湿度集成传感器的量程为25%RH~95%RH,其性能曲线的线性相关系数为0.998。集成传感器中的这3种传感器的高精度表明该集成传感器的制作工艺具有良好的工艺兼容性。 相似文献
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风力机叶片、飞机机翼等结构均为大面积曲面板类结构,基于Lamb波的结构健康检测技术对细微损伤比较敏感,是目前最具应用前景的技术之一。传统的Lamb波传感器大都采用PZT陶瓷制成,质地脆且硬度大,不能适应于曲面结构检测。将PZT陶瓷粉末与环氧树脂复合制备了一种新型柔性0-3型压电复合材料,研究了质量比、极化电场、极化温度和极化时间等因素对压电复合材料性能参数的影响,开展了多因素正交实验来确定材料制备的最优极化工艺参数。实验研究了该压电复合材料制成的传感器对Lamb波的传感响应特性,与现有的MFC、PVDF和传统压电片等传感元件的响应特性进行了对比分析。将制备的传感器应用于翼型曲面板,利用椭圆定位方法进行损伤检测。研究结果表明,PZT陶瓷/环氧树脂压电复合材料传感器具有良好的传感响应特性,能够很好地贴合于曲面板表面,与只能部分耦合于曲面板的传统压电片相比,采集的Lamb波信号更加准确,从而为曲面板类结构健康监测提供一种新型的柔性压电传感技术。 相似文献
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为了防止传感器故障或失效导致的误报警和漏报警,对传感器测量系统本身的故障诊断和失效分析已成为重大基础设施状态监测与故障诊断系统的一个重要问题.通过对桥梁状态实时监测与故障诊断系统中多个传感器之间的关联特性及关联的概率分布进行研究,提出了K-最近邻监测点对目标传感器采集数据的支持度的定义和算法,提出了基于K-最近邻的传感器有效度算法,并将该算法应用于攀枝花倮果大桥健康监测系统的挠度监测数据分析,结果表明,该算法能够准确地描述传感器的失效程度并在时域上定位故障. 相似文献
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为了实现对真空断路器由人工定期检修到实时状态检修的转变,文中设计了一种真空断路器监测系统。系统以STM32F103为微处理器,搭载位移传感器、加速度传感器、霍尔电流传感器和压力传感器,对真空断路器触头位移量、机械振动量、线圈电流量及触头接触压力量进行实时监测。采用EC20作为4G通信模块,将实时数据传输给上位机,实现人机交互。诊断系统根据特征波形进行故障分析,最终判断故障原因。实验结果表明,系统可以对真空断路器进行实时监测和故障诊断,确保断路器发生故障时能够及时维修。 相似文献
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竺嵇声 《振动、测试与诊断》1995,15(3):57-60
工艺流程连续跟踪监测技术是自动化企业追求“无次品生产”的关键,而这一关键的核心又完全有赖于选择相应的传感器。实践证明,压民式传感器因其具有质量稳定、性能可靠、灵敏度高,加之其动态范围大、频率响应宽以及硬而耐磨,尺寸小,易于安装和抗过载安全性好等优点而格外胜任此项工作。 相似文献
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运用力传感器、光栅尺、电动拧紧机、PLC等自动监测和控制装置,通过模拟装配进行装配技术和监测技术研究,从而确定较佳的装配工艺、工艺参数和过程控制方法,并将研究成果运用到新投入的装配生产线中,通过实践运行证明,工艺成熟可靠,有效地保证产品装配品质,同时提升了生产管理能力。 相似文献