摘要：Negative Poisson's ratio(NPR) structure has outstanding performances in lightweight and energy absorption, and it can be widely applied in automotive industries. By combining the front anti-collision beam, crash box and NPR structure, a novel NPR bumper system for improving the crashworthiness is first proposed in the work. The performances of the NPR bumper system are detailed studied by comparing to traditional bumper system and aluminum foam filled bumper system. To achieve the rapid design while considering perturbation induced by parameter uncertainties, a multi-objective robust design optimization method of the NPR bumper system is also proposed. The parametric model of the bumper system is constructed by combining the full parametric model of the traditional bumper system and the parametric model of the NPR structure. Optimal Latin hypercube sampling technique and dual response surface method are combined to construct the surrogate models. The multi-objective robust optimization results of the NPR bumper system are then obtained by applying the multi-objective particle swarm optimization algorithm and six sigma criteria. The results yielded from the optimizations indicate that the energy absorption capacity is improved significantly by the NPR bumper system and its performances are further optimized efficiently by the multi-objective robust design optimization method.

摘要：由于在高效率和精确性之间的好平衡，元模型基于优化算法是一个重要全球优化范畴并且广泛地被使用了。更好解决高度非线性并且集中的工程优化问题，一个提高的混血儿和适应元模型基于的计算全球优化(电子火腿) 首先在这个工作被建议。重要区域更改方法(IRU ) 和不同采样尺寸策略在优化方法被建议提高表演。由使用自动、可伸缩的策略，重要区域将根据搜索结果适应地被更新改进产生精确和集中率。不平的采样策略和集中的采样策略在优化的不同阶段被使用高效地改进搜索并且避免过早地在一个小设计空格聚在一起的结果。新优化算法的有效性被与不同变量凳子标记优化问题作比较到六个优化方法验证。电子火腿优化方法然后被使用优化实际否定泊松比率(NPR ) 的设计参数在这个工作的碰撞盒子。结果显示建议电子火腿在优化计算有高精确性和效率集中的问题和罐头广泛地在设计工业被使用。

摘要：To minimize the auto body's posture change caused by steering and uneven road, and improve the vehicle's riding comfort and handling stability, this paper presents an H∞ robust controller of the active suspension system, which considers the effects of different steering conditions on its dynamic performance. The vehicle's vibration in the yaw, roll, pitch and vertical direction and the suspension's dynamic deflection in the steering process are taken into account for the designed H∞ robust controller, and it introduces the frequency weight function to improve the riding comfort in the specific sensitive frequency bands to human body. The proposed robust controller is testified through simulation and steering wheel angle step test. The results show that the active suspension with the designed robust controller can enhance the anti-roll capability of the vehicle, inhibit the changes of the body, and improve the riding comfort of the vehicle under steering condition. The results of this study can provide certain theoretical basis for the research and application of active suspension system.

摘要：A cylindrical negative Poisson's ratio(CNPR) structure based on two-dimensional double-arrow negative Poisson's ratio(NPR)structure was introduced in this paper. The CNPR structure has excellent stiffness, damping and energy absorption performances,and can be applied as spring, damper and energy absorbing components. In this study, the CNPR structure was used as a jounce bumper in vehicle suspension, and the load-displacement curve of NPR jounce bumper was discussed. Moreover, the influences of structural parameters and materials on the load-displacement curve of NPR jounce bumper were specifically researched. It came to the conclusion that only the numbers of cells and layers impact the hardening displacement of NPR jounce bumper. And all parameters significantly affect the structure stiffness at different displacement periods. On the other hand, the load-displacement curve of NPR jounce bumper should be in an ideal region which is difficult to be achieved applying mathematical optimization method. Therefore, a parametric design strategy of NPR jounce bumper was proposed according to the parametric analysis results. The design strategy had two main steps: design of hardening displacement and design of stiffness. The analysis results proved that the proposed method is reliable and is also meaningful for relevant structure design problem.

摘要：变电站继电保护室安全措施包括“在此工作”标示牌和“运行设备”红遮布。为解决变电站继电保护室内布置安全措施时间过长的问题,提出安全措施自动布置系统方案设计,能够优化继电保护室内安全措施布置流程。该系统具有电子标示牌和电动卷帘,能够通过算法自动识别需要布置安全措施的屏柜信息,自动打开相应的标示牌和红遮布,完成继电保护室内安全措施的布置。经试验证明,该系统将继电保护室内安全措施布置时间降低至2 min以内,有效提高安全措施布置效率。

摘要：为明确郴州市桂阳县烟稻复种连作烟田中云烟87的适宜留叶数,设计留叶数13~20片的8个处理,研究了不同留叶数对烤烟农艺性状、叶面积指数、株型、干物质以及氮磷钾养分积累与分配的影响。结果表明:随着打顶留叶数的增加,烤烟株高增加,氮、磷积累量减少,叶面积指数、干物质积累量、钾积累量呈先增加后减少的趋势;留叶数13~14片的株型为短筒型,留叶数15~18片的株型为筒型,留叶数19~20片的株型为鼓型;留叶数过少会造成烟株矮小,影响中、下部烟叶发育;留叶数过多会降低烟田的叶面积指数,影响烟叶产量和品质。重点考虑烟株和烟叶的干物质量,认为在桂阳烟区稻茬烤烟云烟87的留叶数以17~19片较为适宜。

摘要：2022年在学科专业目录的调整下,增设了舞蹈艺术专业学科学位。这种首次以艺术专业门类为学科学位建设的独立建制,受到了社会的广泛关注。面对新的机遇与挑战,舞蹈艺术专业学科学位建设应当充分从社会现实、学科发展、学生需求等多维层面调整,把握以培养研究型专业人才为目标,通过应用性实践导向,促进学术理论与艺术实践的双轨前行,更好地满足我国舞蹈艺术专业人才培养的现实要求。

摘要：城市公共环境的意义不仅在于满足特定的功能要求,通过支持和激发有意义的城市公共活动,城市公共环境可以成为城市整体中更为意义重大的组成部分。从可防卫空间理论的四个主要关注角度探讨了城市公共环境与城市公共活动建立良性关系,提升城市公共环境品质的途径和方法。

摘要：基于飞机金属整体进气道典型件的T形接头在服役过程中因承受空气循环阻力而导致疲劳断裂的问题,利用激光双光束焊接技术对TC4钛合金进行T形焊接后进行热处理,研究不同热处理方法对焊接接头显微组织特征、疲劳性能及断裂机理的影响。结果表明:双重退火热处理试件疲劳寿命是未经热处理试件的1.89倍,一次退火热处理试件疲劳寿命是未经热处理试件的1.43倍。疲劳断口分析表明,与未经热处理试件相比,热处理后试件疲劳裂纹稳定扩展区疲劳条纹间距降低,表明疲劳裂纹扩展速率降低,因此疲劳寿命增大。热处理后网篮组织中析出针状α′马氏体,试件抵抗裂纹萌生和扩展的抗力增强,促进试件疲劳寿命增大。

摘要：为了解决多普勒差分干涉仪风场探测技术中,干涉图畸变对风速反演带来的系统误差,通过对大气气辉氧原子红线和绿线的正演干涉图添加不同类型、大小的干涉图畸变,仿真对比了含畸变干涉图与理想干涉图反演多普勒相位的差异,得到干涉图畸变对多普勒相位反演精度的影响。结果表明多普勒相位误差随着目标风场与干涉图畸变程度增大而增大,其中条纹局部弯曲影响最大,且弯曲范围越小越靠近采样中心误差越大。通过局部弯曲对不同条纹频率系统产生的误差仿真表明,等量的弯曲对条纹频率高的系统产生更大影响。此外含畸变干涉图多行像元合并时局部调制度降低,不会增加相位不确定度,因此即使干涉图存在缺陷也可以进行多行像元合并,提高信噪比,降低相位不确定度。研究结果为多普勒差分干涉仪的设计、加工、装调指标提供了定量理论依据。