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考虑到刚性、精度及减重等因素 ,机载有源相控阵天线反射板采用铝蜂窝夹层结构。本文简述了铝蜂窝夹层结构反射板的结构要求及制造工艺流程。从胶粘剂、零件定位、公差配合和压制工艺等几方面叙述了影响反射板精度的因素及解决途径。通过优化工艺研制成高精度的铝蜂窝夹层结构反射板 ,满足了设计要求。 相似文献
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通过对某音响底壳零件的结构及工艺分析,阐述了该零件的冲压工艺和模具设计、加工的要点,设计了滑块式弯曲模具的装配图及主要零部件图。实践表明:该零件的冲压工艺方案合理,模具结构型式新颖、加工工艺合理可靠。 相似文献
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特种微机电系统压力传感器 总被引:4,自引:0,他引:4
通过对微机电系统(Micro-electro-mechanical systems,MEMS)压力传感器设计方法与封装制作工艺问题的研究,针对不同应用环境下对压力传感器的性能、尺寸及封装要求,提出相应的传感器力学结构模型——微压结构、梁膜结构及倒杯结构,通过相应的FEM有限元建模方法对传感器结构进行仿真分析并优化结构尺寸,建立合理的力学结构;进行MEMS工艺设计及封装工艺满足传感器微小尺寸、耐高温冲击响应及高过载能力等要求。其中,针对微压传感器在测量过程中高灵敏度与非线性矛盾问题进行力学分析及仿真,分析不同结构的传感器的力学特性及结构尺寸对传感器输出特性的影响,提出新型梁膜结构微压传感器结构,对新型结构传感器进行MEMS工艺研究;根据空气动力学试验、航空测试及火药爆破试验等对高温压力传感器的动态特性要求,采用倒杯式高频响压力传感器及齐平膜封装方式,提高传感器的动态响应特性,满足10 kHz到1 MHz的频响要求;通过有限元分析耐高温冲击封装结构,采用梁膜封装结构提高了耐高温压力传感器的可靠性。通过压力传感器仿真验证、静态特性试验及动态冲击响应试验验证传感器力学结构建模方法、MEMS工艺设计及封装设计的正确性。 相似文献
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对零件结构、毛坯结构、加工基准和工艺装备及切削用量的分析,是优化最佳的工艺路线的一般过程.本文主要对一般汽油机箱体的加工工艺,做些简要阐述和分析. 相似文献
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嵌入式旋合结构涡轮封严盘有利于减轻涡轮转子质量,提高涡轮盘强度及涡轮转子的可靠性,但其装配工艺较为复杂。通过对嵌入式旋合结构涡轮封严盘的结构特点及连接过程进行分析,基于装配需求将其安装过程划分为嵌入旋合及轴向压紧2个阶段,按阶段确立了控制要点及工艺参数,设计了装配方案。经有限元法计算验证,该装配方案的仿真结果满足装配需求,可指导类似结构封严盘装配工艺设计。 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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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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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
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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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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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大型港口机械钢结构细部结构处理问题研究,以卸船机为主要研究对象,基于板壳理论,采用有限元法,梁壳单元混合建模,对卸船机的细部钢结构进行分析,并得到细部结构处理问题的意见和建议。 相似文献
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介绍了挖掘机液压系统的功率参数与流量控制机理,从液压系统的功率角度分析了液压挖掘机的功率控制方式,从挖掘机负流量液压系统与正流量液压系统的工作原理方面分析了其控制性能及优缺点,并总结了挖掘机负流量液压系统与正流量液压系统的技术价值、应用场合及改善方向。 相似文献