Research on the Architectural Design Positioning of University Halls

University hall is an important carrier of information exchange and sharing in higher education campuses,and the correct architectural design positioning can improve the value of university halls.There are many different features in the design and use of university halls and urban theaters.This paper investigates the feasibility study report and indexes of university hall projects,analyzes the indexes,construction scale and functional positioning of university halls in the pre-design period,summarizes some design suggestions,and believes that the use efficiency of university halls should be improved through intensive and compound construction to meet the needs of the rapid development of Chinas Universitys and universities.

Beam Position and Beam Hopping Design for LEO Satellite Communications

The numbers of beam positions(BPs)and time slots for beam hopping(BH)dominate the latency of LEO satellite communications.Aiming at minimizing the number of BPs subject to a predefined requirement on the radius of BP,a low-complexity user density-based BP design scheme is proposed,where the original problem is decomposed into two subproblems,with the first one to find the sparsest user and the second one to determine the corresponding best BP.In particular,for the second subproblem,a user selection and smallest BP radius algorithm is proposed,where the nearby users are sequentially selected until the constraint of the given BP radius is no longer satisfied.These two subproblems are iteratively solved until all the users are selected.To further reduce the BP radius,a duplicated user removal algorithm is proposed to decrease the number of the users covered by two or more BPs.Aiming at minimizing the number of time slots subject to the no co-channel interference(CCI)constraint and the traffic demand constraint,a low-complexity CCI-free BH design scheme is proposed,where the BPs having difficulty in satisfying the constraints are considered to be illuminated in priory.Simulation results verify the effectiveness of the proposed schemes.

Positioning and design by computed tomography imaging in neuroendoscopic surgery of patients with chronic subdural hematoma

BACKGROUND Neuroendoscopy is a very useful technique to Chronic Subdural Hematoma(CSH).But how to achieve the goal of treatment more minimally invasive?AIM To develop a simple,fast and accurate preoperative planning method in our way for endoscopic surgery of patients with CSH.METHODS From June 2018 to May 2020,forty-two patients with CSH,admitted to our hospital,were performed endoscopic minimally invasive surgery;computed tomography(CT)imaging was employed to locate the intracerebral hematoma and select the appropriate endoscopic approach before the endoscopic surgery.The clinical data and treatment efficacy were analyzed.RESULTS According to the learning of CT scanning images,the surgeon can accurately design the best minimally invasive neuroendoscopic surgical approach and realize the precise positioning and design of the drilling site of the skull and the size of the bone window,so as to provide the most effective operation space with the smallest bone window.In this group,the average operation time was only about 1 h,and the clearance rate of hematoma was about 95%.CONCLUSION Patients with CSH can achieve good therapeutic effect by using our way to positioning and design to assist the operation of CSH according to CT scan and image,and our way is very useful and necessary.

Holographic alloy positioning design system and holographic network phase diagrams of Au-Cu system

Taking Au?Cu system as an example, three discoveries and two methods were presented. First, a new way for boosting sustainable progress of systematic metal materials science (SMMS) and alloy gene engineering (AGE) is to establish holographic alloy positioning design (HAPD) system, of which the base consists of measurement and calculation center, SMMS center, AGE center, HAPD information center and HAPD cybernation center; Second, the resonance activating-sychro alternating mechanism of atom movement may be divided into the located and oriented diffuse modes; Third, the equilibrium and subequilibrium holographic network phase diagrams are blueprints and operable platform for researchers to discover, design, manufacture and deploy advanced alloys, which are obtained respectively by the equilibrium lever numerical method and cross point numerical method of isothermal Gibbs energy curves. As clicking each network point, the holographic information of three structure levels for the designed alloy may be readily obtained: the phase constitution and fraction, phase arranging structure and properties of organization; the composition, alloy gene arranging structure and properties of each phase and the electronic structures and properties of alloy genes. It will create a new era for network designing advanced alloys.

Design strategy of intelligent CAD for welding positioner scheme design

Traditional CAD technique does not support the design processes such as function definition, conceptual design and preliminary design, which are most creative and play significant roles on the design quality. Because scheme design has close relationship with product structure, performance and technology cost, it is important for applying the intelligent CAD of scheme design to improve the quality and competitive level of the product. The definition and function of welding positioner are discussed in this paper. The new definition of welding positioner extends the research scope of welding positioner to welding fixture and welding positioning motion mechanism. The design process of welding fixture and positioning motion system is described, and the cased based and knowledge based design strategy of welding positioner scheme design intelligent CAD is then put forward, which lays foundation for developing proto type system of welding positioner scheme design.

Quantifying Design Parameters of Symbology Page for Automotive Head up Display

This paper gives an overview of studies on parameters displayed on the Automotive Head Up Display （A-HUD） including calculation and construction of symbology page based on study results. A study has been made on vital parameters required for car drivers and design calculations have been made based on design parameters like field of view, distance from the design eye position, minimum character size viewable from a distance of 1.5m between driver and the projected image, and optical magnification factor. lhe display format suitable for A-HUD applications depends upon the parameters required to be displayed. The aspect ratio chosen is 4：3. This paper also provides method to design the symbology page embedding six vital parameters with their relative positioning and size considering relative position between display device and optical elements which has been considered with a magnification factor of 2.5. The field of view obtained is 6.7° × 4.8°.

变位机支撑固定座的拓扑优化分析

基于通用有限元分析软件Ansys对变位机支撑固定座进行拓扑优化设计,将传统的焊接式支撑座设计进行轻量化,同时满足材料力学的强度和刚度要求,最终固定座整体质量降低了65%左右,另一方面从理论上证实了有限元分析方法在轻量化设计中的重要性。

双目定位多功能机械臂系统设计

准确性、快速性与鲁棒性是机械臂系统设计的要求,经过研究提出一套新形式的机器人视觉系统,利用非接触式测量,对所操控单元进行位姿计算,完成操控单元的三维信息与机械臂执行单元进行命令交互。设计采用双目CMOS工业相机,通过Matlab进行相机标定并得到内外参数,然后进行立体校正,结合SGBM立体匹配算法解算出位置深度信息,进而对应帧的二维图像,利用OpenCV视觉算法获取操控器下端标志物的三维坐标,传递执行指令给机械部控制单元。由实验结果分析,在白光环境下该机器人系统同步现实功能展现出良好的跟随准确性,精度误差始终保持在4.5%以内,命令响应时间短,鲁棒性好。

阀门定位器阀位检测与压电阀驱动电路设计

本文主要介绍定位器两大模块:阀位检测电路模块与压电阀驱动电路模块进行详细的硬件设计,电路都是针对检测或驱动对象的特性展开设计的,通过理论分析与电路测试证明两大模块的电路设计方案可行性较好。

用于大部件调姿的数控定位器布局及行程优化

针对机翼等大部件装配后姿态调整和精加工等的工艺需求,研制了一种可用于支撑多种机翼的三坐标数控定位器,并对定位器在数字化调姿及精加工平台上的布局和行程进行了分析。将定位器行程解耦成姿态行程和位置行程,建立了适用于多种机翼的定位器行程的目标函数,利用遗传算法获得定位器的布局和最优行程。通过实例对分析方法进行验证,结果表明所提方法是可行的,为大部件调姿中定位器的布局和结构设计提供了依据。

数控焊接变位机在截割头制造中的设计与应用

为提高掘进机截割头的焊接质量和生产率,设计开发了数控变位机应用于焊接工艺过程中。针对截割头的参数和其复杂结构的焊接,给出了数控变位机机械部分的设计方法与计算过程,为设计和应用数控变位机于掘进机零件的制造提供参考。

焊接变位机及其智能化计算机辅助设计

焊接变位机是焊接生产机械化与自动化的重要且又比较薄弱的环节.对焊接变位机在现代生产方式下的功能、作用及焊接变位机的合理设计作了分析,认为在焊接变位机的设计过程中,应该把接头设计、操作机与变位机的配合和变位机的功能结构分析三方面综合起来,进行多方面的分析考虑.最后提出了焊接变位机智能CAD(计算机辅助设计)的总体设计策略,以期为实现焊接结构CAD/CAW奠定基础.

基于MSP430的智能阀门定位器研制

针对工业控制领域对调节阀控制精度和稳定性的要求,设计一种基于MSP430单片机的智能阀门定位器。定位器采用MSP430F5438为核心控制器,执行单元选择高速开关电磁阀,控制算法上采用模糊控制整定PID参数。定位器除可以精确定位外,还具有自整定、自诊断、阀位输出等多种附加功能。在对系统的设计原理、控制要求进行简要说明后,依据模块化设计方法对硬件电路及软件进行了设计。实验结果表明,该系统具有控制精度高、稳定性好、功能丰富、智能化程度高以及便于维护等特点。

A PHEMT Based Wideband LNA for Wireless Applications

This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless applications.The amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) Band.The enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy operation.The common source inductive degeneration method is employed here to enhance the gain of amplifier.The amplifier produces a gain of more than 17 dB and noise figure of about 0.5 dB.The lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of amplifier.Agilent Advance Design System(ADS) is used for the design and simulation purpose.Further the layout of design is developed on the FR4 substrate.

适用多种桥壳焊接的三轴翻转变位机设计与应用

焊接变位机是焊接机器人工作站的重要组成部分,以多种桥壳产品焊接项目为例,概述三轴翻转变位机在机器人焊接工作站中的典型设计思路和应用实例,包括三轴翻转变位机的主要结构设计、技术参数和工作原理。重点分析三轴翻转变位机的工作原理与功能实现。经实践证明,此三轴翻转变位机焊接效果好,自动化程度高,人工操作灵活方便,确保了桥壳焊接质量并满足了焊接要求,对后续项目具有重要的借鉴价值。

电动旋转定位机设计与分析

介绍一种旋转定位机的工作原理，分析了定位机的分度精度和传动力矩计算，建立了完整的设计准则，为定位机的正确使用和设计开发提供了理论根据．

用于飞机大部段对接的数控定位器设计与分析

为提高飞机装配效率,设计了一种用于飞机大部段对接的数控定位器。介绍了这一数控定位器的结构。通过有限元分析,确认这一数控定位器在350kg和2000kg两种工况下具有足够的强度和刚度,可使飞机大部段的支撑和运动得到保障。通过试验,验证了这一数控定位器误差较小,具有较高的制造精度,其结构不会因加载载荷而产生不可逆的塑性变形。

300m^3高炉渣口二套蛇形管煨制工装设计

针对天津铁厂300m3高炉制作过程中蛇形管煨制困难,合格率低,生产成本高等问题,对渣口二套蛇形管煨制工装进行重新设计。通过使用设计的胎具煨制蛇形管的效率得到了很大的提高,缩短了生产蛇形管的生产周期,渣口二套废品率由原来的10%降到了2%,提高了生产效率。

机器人焊接系统中三轴变位机的标准化设计

为了更加快速优质的设备提供给客户,根据公司常用变位机的机型和结构进行标准化设计,形成公司标准设备,使公司整个项目的生产时间大大缩短,提高工作效率,更快的将焊接工作站提供给客户。本文概述了三轴垂直翻转变位机在机器人焊接工作站中典型的应用实例、标准变位机的主要技术参数、三轴垂直翻转变位机的工作原理、结构设计、驱动选型。将模块化的思路贯彻到整个变位机设计的过程,三轴垂直翻转变位机的结构拆分成:驱动单元、从动单元、旋转机架、底座、首箱、尾箱等模块。每个模块有统一的安装尺寸,但是每个模块有不同的结构尺寸,这样经过组合,设计出多种类型,满足多种焊接夹具的需要,适应更广泛的机器人焊接工作站。

伸臂式焊接变位机带传动的优化设计及仿真分析

焊接技术是装备制造业中的核心技术之一。带传动是伸臂式焊接变位机减速机构中传递运动和动力的重要装置。利用MATLAB对带传动装置进行多目标优化设计,在满足承载能力的条件下,实现了带的根数尽量少、带轮直径和中心距尽量小,使得传动结构更加紧凑。利用RecurDyn软件对优化后的传动系统进行运动仿真分析,建立传动带虚拟样机模型,得到相关运动学曲线,为带传动的设计和计算提供了理论依据。