履带式折叠越障搜救车的设计

设计一种适应于灾后废墟区或野外进行搜救的多功能越障车.通过蜗轮蜗杆减速器、轴套轴机构及电磁离合器可使越障车翻越较大障碍;三角型履带轮遇到小障碍时,自然向前滚翻,能够顺利翻越小障碍;车体前后均安装侧臂,可实现双向行走和越障.车体上装置采用模块化设计,能够满足人为或自然的灾后救援、反恐行动等不同任务的要求.     

多功能结构的支撑技术

多功能结构是航天产品前沿技术。本文首先介绍多功能结构的概念 ,然后讨论多功能结构的支撑技术 ,包括理想材料的分析、设计方法、理想材料零件的设计和制造方法、微电子元件的构型优化以及多功能结构设计方法。针对多功能结构设计 ,提出功能驱动的设计框架 ,及基于博弈论的设计方程 ,并给出一个建立设计方程的实例     

CK6136(教学型)数控车床结构组成的研究

在我国提倡节约型社会大环境中，用普通车床改造成数控车床已成为一般厂家和学校的首选。它的工作原理和组成系统是：用普通PC机作为微机控制系统的主机，并在普通车床加装具有接收信号的转位电动刀架，再加有步进电机，其驱动电源采用脉冲调宽电路和平滑细分线路，最终实现车床的多功能低成本自动化，使其成为一台高效、多能的经济型数控车床。     

Modified silicas and their effect on the properties of tribological materials

The paper describes a method for fabricating multifunctional modified silica by forming a thin layer of a polymer—epoxy or phenol-formaldehyde resin—on its surface that is bound chemically to the latter. In order to improve the interaction between the polymer and silica, the surface of the latter is pretreated by a solution of a polyvalent metal salt. The potential of using the developed modified silicas as fillers of tribological polymeric materials and lubricant thickeners is discussed.     

A methodology to determine surface durability in multifunctional coatings applied to soft substrates

The tribological characterization, in particular the surface durability of multifunctional layers applied to soft, non-magnetic materials, due to their important differences in mechanical and tribological properties, constitutes, by itself, an important challenge to the tribologist.These multifunctional layers consist of a solid lubricant coating on top of a hard, wear resistant and high load-supporting layer. The use of low severity conditions, which are necessary to discriminate between solid lubricants, induce unnecessary and unduly long test times. The use of high severity conditions, which are more adequate to analyse the hard, high load supporting layers, produce shorter tests but are not able to discriminate among the solid lubricant deposits.In this paper, a new methodology allowing short test time with good discrimination between multifunctional layers is proposed. The test protocol is based on a method of incremental loading. By increasing the normal load in increments at a constant time interval the surface durability of both the hard layer and the solid lubricant coating was determined. The suitability, reliability and reproducibility of the proposed methodology were determined by testing commercially available solid lubricants (DLC, Teflon^®, MoS₂ dispersed in an inorganic binder and MoS₂ dispersed in an organic binder) coated on commercial aluminium (as received and as anodised).     

环保长效切削液技术研究与集成应用

切削液的全生命周期内，环保和长效应用是重要的关注点，这主要与切削液的性质、使用寿命和操作人员的健康相关。从切削液绿色原材料的选择出发，探讨切削液的绿色研发，包括有毒有害物质的替代、长寿命多功能材料的使用和高生物降解材料的使用等方面；从智能监控、除废除杂、智能调整和废液无害化处理等角度出发，探讨切削液的绿色应用。     

An improved discrete bees algorithm for correlation-aware service aggregation optimization in cloud manufacturing

Owing to the rising demand in efficiency and sustainability in commercial aviation, aircraft manufacturers increase the usage of high-performance, lightweight materials like carbon-fibre-reinforced plastics (CFRPs). These materials pose new challenges to manufacturing processes concerning cost-effectiveness and quality requirements. To meet these challenges, the Institute of Structures and Design within the German Aerospace Center (DLR) designed a flexible robotic manufacturing cell at the Center for Lightweight Production Technology (ZLP) in Augsburg. The multifunctional cell (MFZ) can integrate processes for production and inspection on an industrial scale. Due to large workpieces like fuselage components or wing skins and low production quantities, workshop space and investment cost are major concerns for effective CFRP production. The large size of the cell (30 m?×?15 m?×?7 m) demands a highly reconfigurable space. The platform is composed of five ceiling-mounted robots on a gantry-like machine frame and may be divided in smaller independent cells. The multifunctional cell will improve the understanding of requirements of future production processes for lightweight components by providing a highly flexible platform on an industrial scale.     

气动技术的发展与创新

近年来随着微电子和计算机技术的引入,新材料、新技术、新工艺的开发和应用,气动元器件和气动控制技术迎来了新的发展空间,正向微型化、多功能化、集成化、网络化和智能化的方向发展.从气动元件和系统两个方面对当前气动技术的发展和创新做了简单的介绍.     

S波段收/发集成电路系统的电磁兼容技术研究

阐述了一个应用于S波段有源相控阵雷达的多功能一体化设计的高功率有源收/发集成电路系统, 探讨了该电路的电磁兼容问题,电磁干扰特性,设计思路和方法,提出了该系统微波互连线设计中的相关方法,如选材与匹配、制作工艺控制、模块间的屏蔽隔离、高次模的控制方法、低频互连线的选材与布置和有源收/发集成电路系统解决电磁干扰的多渠道控制思路.     

A microcantilever-based pathogen detector

The ability to detect small amounts of materials, especially bacterial organisms, is important for medical diagnostics and national security issues. Engineered micromechanical systems provide one approach for constructing multifunctional, highly sensitive, real-time, immunospecific biological detectors. We present qualitative detection of specific Salmonella enterica strains using a functionalized silicon nitride microcantilever. Detection is achieved due to a change in the surface stress on the cantilever surface in situ upon binding of a small number of bacteria. Scanning electron micrographs indicate that less than 25 adsorbed bacteria are required for detection.     

多功能分配器设计

分析了多功能分配器的工作原理,设计了多功能分配器结构,研制了多功能分配器的部装件,连续进行了实验,实验结果表明,在生产厚度方向片材时多层材料均匀地复合在一起,各层材料之间结合良好,阻透效果十分理想;在生产宽度方向片材时不同颜色材料构成的双色片材左右对称均匀,各项性能指标都达到了设计要求。     

实用型多功能收割机设计与创新研究

设计了一种实用型多功能收割机,解决了现有收割机在交通不便的地方及山区坡地无法正常工作,以及对于农村分布不集中的零星耕地作业成本较高的问题,满足了山区农民对自动化、高效率收割农作物的需求。     

基于多功能结构的相控阵天线一体化设计

为了满足星载有源相控阵天线对轻量化以及承载、热控等多功能一体化的迫切需求,文中开展了轻质多功能结构相控阵天线的设计理论、制备工艺、控温特性和力学性能等研究,提出了一种基于多功能结构的星载有源相控阵天线一体化设计技术,利用轻质多功能复合安装板结构,合并平面正交一体桁架热管,在内部空间嵌埋有源功能模块,融合低剖面辐射阵面形成天线功能,制备了集控温、承载、电磁辐射于一体的多功能结构的轻质相控阵天线,并对多功能结构天线子阵进行了一体化设计和验证。结果表明,多功能结构天线系统布局改善了微波部件互联的性能,提高了有源阵列的散热和辐射效率以及系统性能,显著减小了天线阵列的剖面,大幅降低了有源阵列天线的重量。     

活塞生产线中复合专机的结构布局形态方案创成

研究了概念设计阶段活塞生产线中复合专机的结构形态创成方法。先综合分析了活塞加工工艺路线，根据复合专机所实现的工序方案，确立了复合专机的基型机的运动及结构形态方案，然后根据生产线及工艺的需求，创成设计出复合专机的结构形态方案，为活塞加工生产线中复合专机的详细设计提供依据。     

New Materials and their Machining

Sophistication in materials applications is the basis of technological progress and therefore there is a continuous search for new materials: i.e. materials that are light in weight, strong, tough, corrosion resistant, durable, wear resistant, resistant to various hazards of nature, safe for our health, etc. The new generation of materials with improved properties pose problems during machining because of their material structure, and hence they require new machining processes. The interactions between the tool and workpiece and also between the various micromechanisms involved in material removal during ductile regime machining of new materials, such as glasses, ceramics, and semiconductors, are discussed in this paper.     

基于SolidWorks的一种新式多功能应急梯

介绍了一种在SolidWorks环境下仿真设计的多功能应急梯,它具备功能多样的同时,也有救生逃生的作用。该多功能应急梯分为4块,由制动装置相连接,平时可作为普通梯子使用。底部装有万向轮,可作运载车使用。底部横杆装有伸缩杆,可作临时帐篷使用。底部横杆装有救生钩,可在火灾发生时做逃生梯使用。功能多样,集成度高,实用性强是该梯子的三大特点。     

A review on ductile mode cutting of brittle materials

Brittle materials have been widely employed for industrial applications due to their excellent mechanical, optical, physical and chemical properties. But obtaining smooth and damage-free surface on brittle materials by traditional machining methods like grinding, lapping and polishing is very costly and extremely time consuming. Ductile mode cutting is a very promising way to achieve high quality and crack-free surfaces of brittle materials. Thus the study of ductile mode cutting of brittle materials has been attracting more and more efforts. This paper provides an overview of ductile mode cutting of brittle materials including ductile nature and plasticity of brittle materials, cutting mechanism, cutting characteristics, molecular dynamic simulation, critical undeformed chip thickness, brittle-ductile transition, subsurface damage, as well as a detailed discussion of ductile mode cutting enhancement. It is believed that ductile mode cutting of brittle materials could be achieved when both crack-free and no subsurface damage are obtained simultaneously.     

A Study of Tribological Phenomena in Friction Couple: Brake Composite Material—Steel

An investigation has been made of the mechanism of the iron layer formation on brake friction materials sliding over a steel surface. The nature of the metallization of specimens of friction materials, as well as changes in the surfaces as a result of sliding, were studied by optical and scanning-electron microscopy, electron-probe microanalysis, X-ray diffraction, thermogravimetric analysis, gas chromatograph analysis, and microhardness measurements. Based on this work and on reviews of some of the most recent results concerning the wear of friction materials, a hypothesis of the metallization of friction linings (iron layer formation) is presented. A model of a tribological system for a frictional brake as well as a model of the subsurface layers of composite brake materials is described.     

仿肌肉-肌腱系统柔性驱动器设计与应用

骨骼肌被认为是一种强大的、灵活的、多功能的生物驱动器。随着软材料、柔性机器人和仿生学的不断进展,基于流体驱动的仿骨骼肌柔性驱动器因其呈现出明显学科交叉特性,成为当下研究热点。因此,以骨骼肌肌肉-肌腱结构概念为设计引导,开发一种大规模并行结构的高度仿骨骼肌柔性驱动器,称为仿肌肉-肌腱系统柔性驱动器。开展柔性驱动器应力,应变和力-速度测试。实验结果显示柔性驱动器的应力达到0.32 MPa, 提升载荷40 kg, 应变为11.7%,并具备与骨骼肌非常接近的力-速度特征。实现了高功率密度,高应力应变,高输出力和固有力学特性集成,并实现关节转动和摆动的应用。     

光学玻璃的精密加工技术

光学玻璃作为一种典型的脆硬材料,采用普通的加工方法难以进行高效精密加工。本文介绍了光学玻璃的高效精密特种加工技术,对ELID法、激光加工、超声磨削以及精密铣削的最新研究进展进行了综述。采用ELID技术,通过控制加工工艺参数,使砂轮单个磨粒的最大切削深度小于脆性材料的临界切削厚度,实现了脆性材料的塑性加工,并得到精密光滑的表面;在加工非球曲面时,可使零件的精加工抛光量降到最低。最新激光加工技术通过增加预热激光束,极大降低已加工表面的热应力及拉伸应力,使得加工质量有了大幅提高。超声波磨削加工不仅改善了表面完整性,而且提高了加工效率,通过选用适当的刀具和工艺参数,使被加工工件表面粗糙度值比普通磨削降低了30%～40%。光学玻璃精密铣削技术通过优化刀具、加工方式及工艺参数,可提高加工质量和效率、降低加工成本。