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机载电子设备经受的振动环境异常复杂,对电子设备进行随机振动分析可以验证机载振动环境下结构的可靠性.文中首先采用有限元法对某机载雷达电子设备进行了模态分析,确定了结构的振动特性;然后进行了随机振动分析,得到了电子设备结构的应力和变形云图;最后根据分析结果对结构的刚强度进行了校核.结果表明,该电子设备的刚强度满足设计要求,达到了验证结构可靠性的目的. 相似文献
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现代航海、航空和航天事业的迅速发展,使舰艇和飞行器系统的功率及速度都有极大的提高,从而引起强烈地宽带随机振动和噪声。这些宽带震源将会激发起舰艇、飞行器结构及其电子设备的多峰谐振,使它们所遇到的振动问题变得愈加复杂,这是因为谐振响应所产生的结构疲劳破坏和由于受到过大的振动加速度而使电子设备失效的现象也愈加严重。这些问题若得不到妥善解决,轻者影响电子设备的工作性能,缩短疲劳寿命;重者还会引起严重故障,甚至造成失败。 相似文献
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随机振动分析是星载电子设备动力响应分析的重要组成部分.通过对电子设备的实体模型简化处理,建立分析模型,利用有限元分析的方法获得随机振动载荷作用下设备各部位的加速度均方根值等系列响应值,为电路板器件布局优化,整机强度、刚度优化提供参考.进行了随机振动试验,实测典型位置的加速度均方根值,对有限元分析模型参数选择的合理性以及分析结果的准确性进行验证. 相似文献
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《机械工程与自动化》2017,(2)
针对无人机某型机载电子设备的小型化原理样机在做随机振动环境试验考核时出现的耳片断裂现象,进行了随机振动仿真分析,研究了耳片断裂失效的机理,并提出了耳片结构的优化设计方法。经随机振动仿真分析及试验验证,优化后的耳片结构可满足使用要求。 相似文献
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星载电子设备的动态特性对于整个系统的可靠性和安全性至关重要。文中以某星载组件为研究对象,采用ABAQUS 建立了某星载设备的完整有限元模型,并进行了模态分析。根据结构固有动态特性,分析了该 结构在加速度过载、正弦振动、随机振动和充压等载荷作用下的结构响应,获取了相应的结构变形和应力分 布。分析结果表明,该组件的结构设计满足星载力学环境的设计要求,为组件的结构设计提供了可靠的依据。 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
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一种涡旋压缩机径向随变机构的设计 总被引:1,自引:0,他引:1
详细介绍了运用随变原理设计的一种新型径向密封机构的结构特点,工作原理及主要参数的确定方法,该机构可补偿由于涡旋体加工精度不高而造成的功率损失,适用于涡旋压缩机的批量生产。 相似文献
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Modern methods of implementation of the rule of positive gradient of mechanical properties are considered; this rule was formulated by I.V. Kragelskii and its application serves to minimize the friction and wear of solids. The given methods include the application of coatings with the method of finishing antifricton abrasion-free treatment; application of new metal-cladding lubricating materials; and creation of a nanostructural state of the surface iron nitride layer by nitriding steel with a positive gradient of hardness normal to the surface. 相似文献
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V. P. Dragunov E. G. Kostsov 《Optoelectronics, Instrumentation and Data Processing》2009,45(3):234-242
Specific features of operation of one- and two-capacitor microelectromechanical converters (MEMC) of energy of mechanical microscopic vibrations into electric energy with a modulated electrode-gap magnitude and with allowance for the mutual influence of electrical and elastic forces are analyzed, and the characteristics of these two devices are compared. The main factors restricting the increase in MEMC power are demonstrated to be the effects of “collapsing” and the condition of conservation of positive rigidity of the system. Expressions for estimating the limiting MEMC parameters are derived. The possibility of electrical energy generation in the presence of “real“ sources of wide-spectrum microscopic vibrations is considered. 相似文献