摘要：A high-intensity continuous-wave(CW) radio frequency quadrupole(RFQ) accelerator is designed for boron neutron capture *** transmission efficiency of a 20-mA proton beam accelerated from 30 keV to 2.5 MeV can reach 98.7% at an operating frequency of 200 *** beam dynamics have a good tolerance to *** comparing the high-frequency parameters of quadrilateral and octagonal RFQ cross sections,the quadrilateral structure of the four-vane cavity is selected owing to its multiple advantages,such as a smaller cross section at the same frequency and easy *** addition,tuners and undercuts are designed to tune the frequency of the cavity and achieve a flat electric field distribution along the *** this paper,the beam dynamic simulation and electromagnetic design are presented in detail.

摘要：This paper considers the problem of disturbance tolerance/rejection of a switched system resulting from a family of linear systems subject to actuator saturation and E-infinity disturbances. For a given set of linear feedback gains, a given switching scheme and a given bound on the E-infinity norm of the disturbances, conditions are established, in terms of linear or bilinear matrix inequalities, under which a set of a certain form is invariant for a given switched linear system in the presence of actuator saturation and E-infinity disturbances, and the closed-loop system possesses a certain level of disturbance rejection capability. With these conditions, the design of feedback gains and switching scheme can be formulated and solved as constrained optimization problems. Disturbance tolerance is measured by the largest bound on the disturbances for which the trajectories starting from a given set remain bounded. Disturbance rejection is measured either by the E-infinity norm of the system output or by the system＇s ability to steer its state into and/or keep it within a small neighborhood of the origin. In the event that all systems in the family are identical, the switched system reduces to a single system under a switching feedback law. Simulation results show that such a single system under a switching feedback law could have stronger disturbance tolerance/rejection capability than a single linear feedback law can.

摘要：针对载人月面着陆器和载人月面移动实验室的动力下降过程中环境复杂、模型不确定性大、干扰强、总体设计难度大的问题,搭建了月面下降高精度模型软着陆控制-羽流-着陆缓冲-人控多学科联合仿真平台,并利用改进的自抗扰控制方法研究月面缓速下降过程。以载人月面移动实验室为研究对象,首先,在Adams软件中建立了月面移动实验室包含承力结构、大容量贮箱、着陆支腿、发动机、气电管路等部件的精细多体动力学模型;然后,在Matlab/Sim-ulink环境中构建了月面移动实验室下降过程的导航、制导与控制功能模块,针对月面下降过程中的羽流等复杂干扰、发动机推力模型不准确等强不确定性问题,采用了改进的自抗扰控制方法;最后,利用该联合仿真平台对月面下降过程进行迭代仿真,验证了飞行器系统对发动机推力特性不确定性等各类干扰的鲁棒性以及对单台发动机故障的冗余控制能力。结果表明:采用对飞行器精细化建模并进行跨平台、多学科联合仿真的方法,能有效评估飞行器在复杂干扰、强不确定性及故障条件下的系统性能。

摘要：This paper presents studies of aeroelastic optimization on composite skins of large aircraft wings subject to aeroelastic constraints and strength/strain constraints. The design variable for optimization was the ply thickness of the wing skin panels, and the structural weight was the objective function to be minimised. The impacts of three strength/strain constraints and the ply proportion of the wing skin panels on the optimization results are discussed. The results indicate that the optimal composite wings that satisfy different constraints have remarkable weight advantages over metal wing. High levels of stiffness can be achieved while satisfying the constraints regarding allowable design strains and failure criteria. The optimization results with variable-proportions indicate that wing skins with higher proportions of 0° plies from the root to the middle segment and ±45° plies outboard have a more efficient and reasonable stiffness distribution.

摘要：弘扬中华美育精神是新时代高校美育工作的重要内容。在“图形创意”课程教学过程中,依据学科特色以及艺术设计专业的学生特点,深入挖掘教学中的美育元素,通过导入遵循美育特征的教学案例、融入中华优秀传统文化、开展主题竞赛实践以及倡导学生扎根时代生活进行创作的一系列教学方法,可以在提高学生专业知识水平及审美能力的同时培养学生的道德情操,实现知识传授与价值导向的有机结合。

摘要：艺术作品是艺术家深入生活、观察生活,通过创作的形式表达自己对人生、自然和生活的思考,能够体现超越现实物象的艺术价值,是对真实生活的提炼与升华,插画作为一种艺术形式也不例外。真实的生活是丰富多彩的,为感官和心灵带来数不尽的体验,这些生活体验能够给予插画创作丰富的灵感和素材,从而获得更好的画面效果。该文提出将生活体验融入绘画能力训练、创意构思训练以及创作严谨性等主要插画教学环节,设计相应的教学方法,以此提升插画设计课的教学效果、解决学生在创作过程中遇到的问题。

摘要：针对载人月球探测任务飞行模式复杂、航天器状态多、技术指标要求高的问题,基于SysML和Modelica建模语言对载人月球探测航天器进行总体设计和仿真验证研究,结合航天器型号流程提出一套基于模型的载人月球探测航天器总体方案设计流程。首先基于SysML语言从工程总体需求出发,逐项分解出系统级需求;其次根据工程总体提供的载人月球探测飞行模式开展系统行为分析,同步设计应急救生方案;再次通过系统行为分解航天器功能模块及分系统,赋予物质、能量和信息描述;最后基于SysML模型搭建Modelica仿真体系,对航天器系统的总体参数进行仿真验证,同时经仿真确认后将功能、性能参数进行条目化分解,形成系统总体对分系统的需求。以载人月球探测航天器系统为例验证了设计流程有效性,为其它航天器MBSE应用提供参考。

摘要：国家级非物质文化遗产乐作舞发源于云南省红河县阿扎河乡垤施洛孟一带,集歌、舞、乐于一体,起初由哈尼族、彝族共创。随着族际交往范围的扩大,乐作舞传播到汉族、傣族、瑶族等民族中,是典型的多民族共享的民间舞蹈。文章通过分析多民族共享乐作舞的诗性根基、现实条件及价值逻辑,为民间舞蹈的多民族共享机制研究提供典型个案。多民族在增进乐作舞共同性的同时,又能尊重和包容其差异性,使乐作舞成为沟通多民族的艺术媒介和情感纽带。乐作舞个案经验表明,多民族共享民间舞蹈是多民族一体性身份认同的身体叙事和象征符号,是区域性多民族社会团结互助、和谐共处的重要基础。

摘要：利用分布参数法,对用于100 W@2 K低温系统的绕管翅式负压换热器和板翅式负压换热器进行了设计,质量流量为5 g/s。以液氦出口温度、换热效率和壳程压降作为设计指标,初步确定了两种型式的换热器尺寸。利用数值模拟的方式对该设计结果进行了校核,发现数值模拟与设计计算在换热计算上吻合较好,但在阻力计算上并不匹配。设计尺寸下,绕管翅式换热器性能指标为2.239 K、82.6%和68.12 Pa;板翅式换热器的性能指标为2.278 K、81.59%和77.49 Pa。

摘要：为进一步探索高性能离心压缩机的优化设计方法,以某气浮轴承离心制冷压缩机叶轮为研究对象,结合多层前向神经网络,发展了基于非支配近邻免疫算法的叶轮多目标优化策略。首先,采用免疫算法优化神经网络的隐含层结构,以提升其作为代理模型的非线性逼近能力;其次,以近喘振点、设计点、近堵塞点的多变效率最大为优化目标,采用免疫算法进行叶轮全工况性能寻优,并通过数值仿真对优化前、后叶轮的气动性能及流动特性进行了对比分析。仿真结果表明:采用免疫算法进行优化后,叶轮在近喘振点、设计点、近堵塞点的多变效率分别提高了1.8%、1.9%、4%,稳定运行工况范围明显拓宽;对比流场后发现,在90%叶高处,主叶片和分流叶片载荷从前缘至尾缘均明显增加,叶片做功能力增大;分流叶片进口倾角减小使得叶片进口冲击损失降低,流道内泄漏流与主流掺混现象明显减弱,叶轮内部流动更加均匀。研究结果验证了所提多目标优化策略的有效性。