共查询到20条相似文献,搜索用时 578 毫秒
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介绍了一种新型的基于直线电机驱动的复合传动增压装置,对系统的工作原理进行了分析,并给出了工作原理图,对系统的输出流量与输出力进行了分析计算,给出了相应的计算式.该装置实现了液压油的封闭式循环,减轻了油液对环境的污染,技术功能较为完善,工作效率显著提高. 相似文献
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介绍了一种微型电机轴的绿色加工方法,它突破了微型电机轴传统的加工方法,改车削两端半球面为冷镦,变外圆磨削为冷拉.由于是无切屑加工,节省了材料;由于取消了热处理,节省了能源;由于省去了磨削工序,节约了成本,减轻了对环境的污染,因而实现了微型电机轴的绿色加工. 相似文献
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网络化制造是企业为快速响应市场需求和提高竞争力的一种先进制造模式.以某大型半导体封装企业的信息管理系统需求为基础,分析了在网络化制造环境下企业急需解决的问题,提出了设计目标,建立了功能模型,设计了系统结构,给出了实现技术.该系统较好地解决了企业信息管理方面存在的问题,提高了企业的竞争力. 相似文献
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本文研究复杂机床切削工艺系统分析方法,提出了分析思路。基于此思路以某复杂机床主轴分析为工程案例进行了分析,建立了其有限元模型,并得到了其变形及应力分布,并对其进行了验证,然后,对其进行了模态分析,得到了前10阶模态。为复杂机床切削工艺系统分析提供了方法和依据。 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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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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对某型卫星转播车方舱的装载要求进行分析,结果证明,必须对方舱舱体的质量进行严格的控制,在不影响整舱强度的条件下,采取各种方法,尽量将方舱质量减到最轻。本文从方舱的舱板、舱门及孔口和舱体拼装等几个方面,对可能采取的减轻质量的方法进行了分析,对方舱所用型材、拼装结构和涂胶量进行优化、减重分析和处理,结果可满足对整车的功能性要求和质量限制。 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
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针对废旧轿车无级变速箱再制造工艺碳排放问题,提出了一种多层次关联分析理论与碳排放系数法相结合的再制造工艺碳排放量化方法。对无级变速箱再制造工艺过程的碳排放特性进行分析,定义了再制造工艺系统边界,将系统内多种碳源进行归类分析,构建了多层次碳排放要素之间的关联矩阵,并结合碳排放系数法进行基本碳源建模,提出无级变速箱再制造工艺碳排放量化方法。基于碳排放评估的角度对无级变速箱的再制造工艺进行研究,并以带轮盘激光修复工艺为例,验证了所提出碳排放量化方法的有效性。实验结果表明,在无级变速箱带轮盘激光修复工艺过程中,设备碳排放是总碳排放的主要组成部分,相比于其他碳排放影响因素,扫描速度对设备碳排放以及总碳排放的影响程度最大。 相似文献
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铣削图形自动编程系统的研究 总被引:2,自引:0,他引:2
介绍了一种铣削图形自动编程系统。该系统以Win2000为平台,以VC6.0为开发工具,以DXF形式读取用Auto-CAD绘制的零件图或工艺图,经过工艺分析和处理,自动生成NC代码,并进行仿真加工。 相似文献
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Elisa do Carmo Agostini Balbinot Marta Fvaro Costa Cesrio Pereira Jovito Adiel Skupien Carlos Eduardo Agostini Balbinot Grazielli da Rocha Sergio Vieira 《Microscopy research and technique》2019,82(11):1953-1961
The objective of this study was to evaluate and correlate light transmittance (T), initial degree of conversion (IDC), and degree of conversion after 24 hr (DC24) for 22 composite resins (CR) for enamel and dentin use. The transmittance (n = 10) was measured with a spectrometer at a wavelength of 468.14 nm. The degree of conversion (DC; n = 5) was measured with Fourier Transform Near‐Infrared Spectroscopy before polymerization, immediately after photoactivation, and 24 hr after photoactivation. Both sets of values are provided as percentages. ANOVA and Games‐Howell (α = 5%) tests showed that Filtek Supreme Ultra gave the highest T values of all enamel CRs, while Esthet‐X HD presented the lowest. Meanwhile, Venus diamond gave the highest values of all dentin CRs, while Esthet‐X HD gave the lowest. For IDC and DC24, ANOVA showed differences between individual CRs and the two CR types (p < .0001). Despite the limitations of this study, it can be concluded that there was no correlation between T and either IDC or DC24 (p > .05); however, IDC and DC24 were strongly correlated (p < .05) by Pearson's correlation. That being said, as a higher DC reflects better mechanical properties, certain conclusions can be drawn about overall performance. The best IDC values were observed for the Opallis enamel resin and the Opallis and Premise dentin resins. Meanwhile, the best DC24 values were observed for the Opallis, Charisma, and Premise enamel resins and the Opallis and Premise dentin resins. Degree of conversion and light transmittance showed differences between composite resin types (enamel and dentin) and brands. It is important to know at the moment of composite choice taking into account mechanical and optical properties. 相似文献
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描述了用于K型热电偶回路中的镍铬接触对在电连接器的振动过程中发现接触电阻变大的失效现象,从接触电阻的理论构成和失效接触对的实物状态进行原因分析,通过更换绝缘体材料、固定接触对及更换接触对等方式进行试验验证,确定主要原因。针对分析结果,通过降低表面粗糙度、提高接触压力、涂覆固体膜润滑剂和调整接触对固定机构等方式,解决了镍铬接触对在振动过程中的接触电阻失效问题。通过一系列的试验,总结了避免镍铬接触对失效的关键措施。 相似文献