基于 ADAMS 的自适应性摩擦驱动系统的动力学分析

为了提高自适应摩擦驱动系统的转弯性能,针对转弯力矩,建立了摩擦驱动系统的静力学模型,运用ADAMS的动力学仿真功能对模型进行静力学和运动学特性分析,并在此基础上进行改进,提高了系统的转弯性能和系统的可靠性。     

薄气垫装置的承载特性分析

本文介绍了薄气垫原理，元件及其组成方式，分析了承载特性、刚度特性能以及节流器和节流方式对系统刚度的影响，为解决实用中的载荷控制提供了方法和依据。     

电液混合全冗余并联机构驱动优化

基于冗余并联机构主动输入约束螺旋线性相关性的分析,以Stewart平台机构为原型,构造12-UPS全冗余驱动并联机构。通过比较电动驱动和液压驱动的不同,确定机构适宜采用电动液压混合驱动形式。应用影响系数法建立该机构的动力学模型。为区分处理电动缸和液压缸,以零内力为约束条件对驱动力进行优化。分别以驱动力平方和最小和驱动功率平方和最小为目标,应用库恩—图克定理研究机构的驱动力优化过程。数值算例表明:零内力条件下以驱动功率平方和最小为目标的优化方法最佳。该优化方式能够充分发挥电动、液压驱动各自的优点而避免其缺点,适用于电液混合驱动的全冗余并联机构。     

MEXICA: A computer model of a cognitive account of creative writing

MEXICA is a computer model that produces frameworks for short stories based on the engagement-reflection cognitive account of writing. During engagement MEXICA generates material guided by content and rhetorical constraints, avoiding the use of explicit goals or story-structure information. During reflection the system breaks impasses, evaluates the novelty and interestingness of the story in progress and verifies that coherence requirements are satisfied. In this way, MEXICA complements and extends those models of computerised story-telling based on traditional problem-solving techniques where explicit goals drive the generation of stories. This paper describes the engagement-reflection account of writing, the general characteristics of MEXICA and reports an evaluation of the program.     

核电管道承插焊口的射线透照工艺

承插焊接的连接形式主要用于小口径阀和管道、管件和管道焊接，其结构形式为管道的插入角接型式，接头属于角接接头，由于其厚度的不同和其结构的特殊性，和厚度差变化范围较大，此种接头的内部检验给射线检测带来了一定难度泰文针对承插焊口的拍片过程及其特点，提出了采用自设自装的一种可提高插套拍片效率、准确度的焦距堆直器，在检测过程中，采用背屏及滤光板进行散射线控制，结合透照厚度的计算确定检测工艺参数的透照检测工艺参数，包括曝光时间，曝光，焦距以及胶片尺寸的大小。此种工艺的提出，可适应核电各系统的插套的检测，检测技术及工艺的应用在其他工程建设方面也有较强的借鉴推动作用。     

发动机启动不连续问题分析及解决措施

某车型搭载的1.8L自然吸气式发动机在市场上出现启动不连续的问题.为解决此问题,本文详细分析了与发动机启动相关的因素,在理论分析的基础上,通过试验对比的手段进行了逐一验证.结果表明,造成发动机启动不连续的原因为发动机驱动盘尺寸错误,导致转速传感器信号错误,引起ECU点火时刻错误,最终导致发动机启动不连续.针对该故障原因,提出了优化驱动盘尺寸的方案.经试验验证,该方案能有效解决发动机启动不连续的问题.     

Phenanthrene-functionalized 3,6-dithiophen-2-yl-2,5- dihydropyrrolo[3,4-c]pyrrole-1,4-diones as donor molecules for solution-processed organic photovoltaic cells

3,6-Dithiophen-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) based organic molecules and polymers have received strong attention as the donor materials of efficient organic photovoltaic cells (OPVs). This paper reports the synthesis and characterization of two DPP-based organic molecules functionalized with phenanthrene and ethynylphenanthrene and their application as the donor materials of solution-processed OPVs. They have band gaps of 1.6-1.8 eV and appropriate energy levels, and they can be soluble in common organic solvents such as chloroform and tetrahydrofuran. The C≡C triple bond in ethynylphenanthrene has a strong effect on the structure and properties of molecules. It increases the rigidity of molecule, decreases the solubility in organic solvents, and increases the crystallinity of the active layer and photovoltaic performance of the OPVs. The optimal photovoltaic efficiency of OPVs with ethynylphenanthrene-functionalized DPP is 1.71% under AM 1.5 G illumination (100 mW cm⁻²), more than double of that of the OPVs with phenanthrene-functionalized DPP.     

Φ114mm定径机组的设计

介绍了Φ１１４ｍｍ定径机组的结构、技术参数及使用状态。     

日中の蚕书类にみる古蚕具の比较试论

日本从江户时代起、中国从周代起至唐宋,很多古籍和农蚕书记载着当时蚕具的形制,更从书中的插图以及《耕织图》,加深了对古代蚕具的认识。公元前后,日中两国蚕具大多以木、竹和芦苇为材料,形制也类似,其后因就地取材方便,向各自的方向发展,日本重视稻草的利用,固定蚕架改为活动蚕架(棚),名称也各不相同。近年日本推行高工效饲育技术,走向机械化,传统的蚕具急速消减,而中国仍保持传统的蚕具。     

Macroscopic isotropy of two- and three-dimensional elastic lattice models

Particle methods such as the meso-particle method or the method of movable cellular automata provide new possibilities for the simulation of wear, mass-transfer, plastic deformation and melting processes. One crucial point, however, is to ensure that in the continuum limit macroscopic isotropy is guaranteed. We show how this can be done in two- and three-dimensional lattices.