共查询到20条相似文献，搜索用时 156 毫秒
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行走减速器是掘进机履带的重要传动部件,传统的设计方法会造成较大的设计余量,使减速箱的体积偏大。为了解决问题采用三级NGW行星齿轮传动,并基于PROE三维软件对其结构特点与实体效果进行优化仿真。 相似文献
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在轧机主传动系统中,万向接轴是十分关键的部件,其结构十分复杂,工作过程中需要承受随机冲击转矩。本文对轧机主传动万向接轴的受力特点进行了分析,并对其疲劳设计进行了探析,指出疲劳设计载荷应为轧机冲击扭矩载荷谱,并且,所设计的方法同样可以应用于具有相同载荷特征的机械零件的疲劳设计中。 相似文献
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本文介绍了XK6125数控铣床总体及横向进给传动机构的设计,设计的铣床可以实现铣削平面、斜面、沟槽、齿轮等功能。根据相关的数据及要求,完成了XK6125卧式数控铣床总体及横向进给伺服系统的设计;并对其进行了机械设计,机械设计包括丝杠的选型和校核,轴承的选择等;并通过选择一些重要的部件并对其进行稳定性校核。 相似文献
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对山楂去核机的方案进行了设计,其主要分为主传动和副传动。主传动主要有槽轮机构,通过槽轮机构带动工作台作间歇转动,副传动用于带动冲头上下运动,其主要组成为一对螺旋齿轮、凸轮和摆动推杆。文章对传动的基本参数和主传动中的槽轮机构进行了设计,其结果可以满足基本要求。 相似文献
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齿轮传动由于具有结构紧凑、传动精确、效率高、寿命长等特点,使其成为机械设备中不可或缺的连接和传递动力的通用部件。本文主要对齿轮的故障诊断系统做深入探讨。 相似文献
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FluidSIM软件分为FluidSIM-H（液压传动）和FluidSIM-P（气压传动）两个模块,利用其可以对几乎所有的液/气压传动系统进行仿真,改变了以往的授课模式,特别是在实践教学环节中学生使用FluidSIM软件对回路进行模拟运行和检验,结合液压传动实验台,通过实操的方式参与到液压传动回路设计和仿真的整个过程,激发学生的学习兴趣,提高学习效果。 相似文献
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以AumCAD为二次开发平台,利用内嵌于AutoCAD的VBA语言进行编程,开发了V带传动的CAD系统,该系统用户界面友好,实现了v带传动的设计和绘图一体化,显著提高了设计与绘图的质量和效率。 相似文献
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汇编语言开发的程序有着很高的执行效率,而Visual C 是应用广泛的高级语言开发工具。汇编语言在Vi-sual C 中的应用能够有效提高程序的效率。本文介绍了Visual C 中调用汇编语言的常用方法和进行混合编程的要点。 相似文献
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Wenbo Pang Xu Cheng Haojie Zhao Xiaogang Guo Ziyao Ji Guorui Li Yiming Liang Zhaoguo Xue Honglie Song Fan Zhang Zheng Xu Lei Sang Wen Huang Tiefeng Li Yihui Zhang 《国家科学评论(英文版)》2020,7(2):342
The manufacture of 3D mesostructures is receiving rapidly increasing attention, because of the fundamental significance and practical applications across wide-ranging areas. The recently developed approach of buckling-guided assembly allows deterministic formation of complex 3D mesostructures in a broad set of functional materials, with feature sizes spanning nanoscale to centimeter-scale. Previous studies mostly exploited mechanically controlled assembly platforms using elastomer substrates, which limits the capabilities to achieve on-demand local assembly, and to reshape assembled mesostructures into distinct 3D configurations. This work introduces a set of design concepts and assembly strategies to utilize dielectric elastomer actuators as powerful platforms for the electro-mechanically controlled 3D assembly. Capabilities of sequential, local loading with desired strain distributions allow access to precisely tailored 3D mesostructures that can be reshaped into distinct geometries, as demonstrated by experimental and theoretical studies of ∼30 examples. A reconfigurable inductive–capacitive radio-frequency circuit consisting of morphable 3D capacitors serves as an application example. 相似文献
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政策是驱动技术创新的一种新动因。在促进技术创新的同时,政策也可能诱发专利竞赛,增加专利丛林密度,甚至阻碍创新成果推广与扩散。为了探索我国科技资助政策是否能够解决专利集成问题,运用案例研究的方法,对“科学仪器重点专项”专利政策进行深入分析。研究发现该专利政策虽然注意到专利集成问题并努力解决,但是忽视了背景专利的集成问题,存在着专利集成失败的风险。为了发挥政策引导创新的作用,建议我国政策制定者事前解决专利集成失败风险。 相似文献
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本文基于有限元分析方法,采用适合中、小型光学元件的周边支撑结构形式,进行了某星载温室气体探测仪大平面反射式闪耀光栅支撑结构的设计。通过对光栅组件进行有限元建模,以及固有模态、静力学、动力学、光机热集成分析,优化了支撑结构设计,使得光栅组件基频〉300Hz,在±5℃均匀温度变化和1g重力耦合作用下,光栅刻划表面波前面形精度仍符合光学设计要求。最终工程分析结果表明：大平面反射式闪耀光栅的支撑结构设计是合理的,光栅组件固有一阶频率高,抗重力变形能力、抗震性能均能满足仪器总体设计指标要求,通过选用不同热膨胀系数的结构材料及合理设计零件配合尺寸等消热设计手段有效抑制了光栅支撑结构的变形对光栅结构的扭曲作用。 相似文献
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Three-dimensional microfluidics holds great promise for large-scale integration of versatile, digitalized, and multitasking fluidic manipulations for biological and clinical applications. Successful translation of microfluidic toolsets to these purposes faces persistent technical challenges, such as reliable system-level packaging, device assembly and alignment, and world-to-chip interface. In this paper, we extended our previously established fit-to-flow (F2F) world-to-chip interconnection scheme to a complete system-level assembly strategy that addresses the three-dimensional microfluidic integration on demand. The modular F2F assembly consists of an interfacial chip, pluggable alignment modules, and multiple monolithic layers of microfluidic channels, through which convoluted three-dimensional microfluidic networks can be easily assembled and readily sealed with the capability of reconfigurable fluid flow. The monolithic laser-micromachining process simplifies and standardizes the fabrication of single-layer pluggable polymeric modules, which can be mass-produced as the renowned Lego® building blocks. In addition, interlocking features are implemented between the plug-and-play microfluidic chips and the complementary alignment modules through the F2F assembly, resulting in facile and secure alignment with average misalignment of 45 μm. Importantly, the 3D multilayer microfluidic assembly has a comparable sealing performance as the conventional single-layer devices, providing an average leakage pressure of 38.47 kPa. The modular reconfigurability of the system-level reversible packaging concept has been demonstrated by re-routing microfluidic flows through interchangeable modular microchannel layers. 相似文献
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首先介绍了传统轮毂盘总成在车桥上的应用结构,并分析此结构在应用上存在的缺点;其次介绍免维护轮毂盘总成的结构特点和工作原理,最后展望免维护轮毂盘总成在车桥上的应用前景。 相似文献
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Boron doping-induced interconnected assembly approach for mesoporous silicon oxycarbide architecture
Despite desirable progress in various assembly tactics, the main drawback associated with current assemblies is the weak interparticle connections limited by their assembling protocols. Herein, we report a novel boron doping-induced interconnection-assembly approach for fabricating an unprecedented assembly of mesoporous silicon oxycarbide nanospheres, which are derived from periodic mesoporous organosilicas. The as-prepared architecture is composed of interconnected, strongly coupled nanospheres with coarse surfaces. Significantly, through delicate analysis of the as-formed boron doped species, a novel melt-etching and nucleation-growth mechanism is proposed, which offers a new horizon for the developing interconnected assembling technique. Furthermore, such unique strategy shows precise controllability and versatility, endowing the architecture with tunable interconnection size, surface roughness and switchable primary nanoparticles. Impressively, this interconnected assembly along with tunable surface roughness enables intrinsically dual (both structural and interfacial) stable characteristics, achieving extraordinary long-term cycle life when used as a lithium-ion battery anode. 相似文献
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Uwe Tangen Gabriel Antonio S. Minero Abhishek Sharma Patrick F. Wagler Rafael Cohen Ofir Raz Tzipy Marx Tuval Ben-Yehezkel John S. McCaskill 《Biomicrofluidics》2015,9(4)
Nanoscale synthetic biology can benefit from programmable nanoliter-scale processing of DNA in microfluidic chips if they are interfaced effectively to biochemical arrays such as microwell plates. Whereas active microvalve chips require complex fabrication and operation, we show here how a passive and readily fabricated microchip can be employed for customizable nanoliter scale pipetting and reaction control involving DNA. This recently developed passive microfluidic device, supporting nanoliter scale combinatorial droplet generation and mixing, is here used to generate a DNA test library with one member per droplet exported to addressed locations on microwell plates. Standard DNA assembly techniques, such as Gibson assembly, compatible with isothermal on-chip operation, are employed and checked using off-chip PCR and assembly PCR. The control of output droplet sequences and mixing performance was verified using dyes and fluorescently labeled DNA solutions, both on-chip and in external capillary channels. Gel electrophoresis of products and DNA sequencing were employed to further verify controlled combination and functional enzymatic assembly. The scalability of the results to larger DNA libraries is also addressed by combinatorial input expansion using sequential injection plugs from a multiwell plate. Hence, the paper establishes a proof of principle of the production of functional combinatorial mixtures at the nanoliter scale for one sequence per well DNA libraries. 相似文献