摘要：Biomedical metals are widely used as implant materials in the human or animal body to repair organs and restore function, such as heart valves, meninges, peritoneum and artificial *** element affects the microstructure, mechanical property, corrosion resistance and wear resistance, but also influences the antibacterial and biological ***, antibacterial metal alloys have shown great potential as a new kind of biomedical materials, in which Cu has been widely used as antibacterial agent *** addition, biodegradable metal alloys, including magnesium alloy and zinc alloy, also have attracted much attention *** was also used as alloying element to adjust the degradation ***, the role of Cu in the alloy design will be very important for the development of new *** this paper, we summarized the recent research results on the Cu-containing metal alloy for biomedical application and hoped that this review would give more suggestions for the further development of biomedical metal alloy.

摘要：以B样条曲线为基础、采用计算流体力学方法,并结合改进的粒子群优化算法,提出了一套环形混合排气系统喷管型线与环形混合器径向位置的一体化优化设计方法,并采用该方法对某型使用中的环形混合器混合排气系统进行了优化设计.优化结果表明,较之原始模型,优化后的环形混合器混合排气系统在流量分配方面与设计值更为接近,涵道比的误差为2.8%.气动性能方面,设计条件下,优化模型推力为原始模型的1.061倍,总压恢复系数则提升至0.995;在非设计条件下,优化模型的总压恢复系数较原始模型提高了0.7%和0.4%,推力较原始模型提高了1.2%和2.7%.

摘要：文章以石家庄于家村为例,分析和探讨了传统聚落的文化景观及现状,提出要使聚落真正意义上"活下去",就必须在地域类型学的基础之上沿承有序的发展。更新与发展是必然趋势,意味着新与旧的并置是环境多样性的共生,也是走出目前困境的有效之路,因此更新设计在于满足现实的需求,但又需要着眼于未来。

摘要：针对陀螺效应明显的磁轴承-转子系统转速变化引起的模型变化而带来的控制问题,提出基于LMI的鲁棒增益调度方法设计控制器。通过建立系统依转速变化的LPV模型,设计了鲁棒增益调度控制器,使转子在全转速范围内保证了鲁棒稳定性和性能。为降低控制器设计的保守性,可缩小转速区间设计控制器使控制性能得到提高。与基于LTI模型设计的鲁棒控制器相比,LPV鲁棒增益调度控制器在保证控制性能同时,实现以转速为参数的自适应调节。仿真结果验证了此控制器的有效性和先进性。

摘要：多旋翼无人机难以适用于复杂飞行任务,为满足不同任务需求,以组合拼接方式构成特定构型飞行器是一种可行的发展方向,组拼前后飞行器各项飞行特性都有不同程度的变化,外部扰动的影响程度也有不同,给飞行控制系统设计与验证带来极大挑战。设计一种拼接式倾转双旋翼飞行器,建立其飞行动力学模型,并设计组拼前后飞行器操控策略和基于线性自抗扰控制(LADRC)的位置、姿态控制器,完成对阵风干扰环境下的飞行器控制仿真验证;通过与传统PID控制器对比来验证LADRC的优越性,并开展实机姿态稳定控制验证。结果表明:拼接式倾转双旋翼飞行器及其线性自抗扰控制器的抗干扰性、鲁棒性强,组拼前后飞行器均具有良好的飞行控制效果。

摘要：为降低结构质量、提高运载能力,某小型固体运载器采用复合材料箭体结构设计方案和静不稳定气动设计方案,运载器具有较大的挠性,一级飞行过程中,由于稠密大气的影响,结构和控制耦合现象明显,对控制系统设计提出巨大挑战;同时,控制系统还面临发动机结构引起的干扰、风干扰、质量质心时变特性以及气动参数不确定性等问题。针对这些问题,设计了带有主动振动补偿和漂移控制的Backstepping控制器,通过滑模观测器估计低频弹性振动的影响,并给予补偿,采用反演控制技术设计非线性鲁棒控制器,以适应系统中存在的较强的不确定性,确保在一级飞行过程中的全局渐进稳定,提供可选择的漂移控制通道,修正由于风干扰引起的横向、法向漂移。通过运载器飞行仿真环境验证了控制器性能。Montr Carlo仿真结果表明,在各种干扰影响下,所设计的非线性鲁棒控制器的姿态跟踪误差不超过2°,控制舵偏角不超过5,°满足总体方案要求。

摘要：采用大长细比、轻结构质量设计方案的固体运载器结构刚度较小,姿态控制系统设计需要考虑弹性振动的影响。设计了自适应滤波器实现对箭体弹性振动信号的抑制:将滤波器参数自适应问题转化为系统参数辨识问题,通过Steiglitz-McBride参数辨识方法求解,该方法具有计算复杂性低、收敛迅速等特点,适用于箭上计算机实时计算。通过闭环仿真表明,在箭体弹性频率发生变化的条件下,具有自适应滤波器的控制系统能够跟踪这种变化,有效抑制振动信号对控制器的影响,保持运载器姿态运动稳定。

摘要：In this study,an environmental simulation platform(ETS-02)was constructed for high-precision geodesic instruments(e.g.,absolute/relative gravimeters and inclinometers),to test the disturbances caused by environmental fl *** outer layer of the platform was constructed with two sets of rectangular electromagnetic coils,which generated the required magnetic fi eld when current was *** inner layer was a closed cabin in which radiators were distributed such that the temperature of the experimental space inside the cabin could be controlled,by energy exchange between the radiators and a thermal controller through the fl owing liquid.A high-precision hexapod was used to simulate the tilt-related eff *** platform was capable of adjusting temperatures within a dynamic range of 0℃-70℃ at a resolution of 0.01℃.The noise of the power-spectrum density when the cabin was set to room temperature was measured as 0.03℃/Hz^(1/2) at 1 *** magnetic field simulation had a dynamic range of±300μT and stability of 20 *** resolution of the ground-tilt simulation was 1 arc *** inner space of the platform had a volume of approximately 5 m^(3),which is sufficient for most types of instruments to be tested for a general environmental coupling *** illustrate the application of the platform,a dual-axis inclinometer was built and tested carefully with the platform,and the accuracy of the calibration factors was found to be signifi cantly improved.

摘要：日本是一个盛产"青春"的国度,"青春片"的概念也是由日本学者最先提出的。2012年日本《电影旬报》评出的年度十大电影中青春片占三部,其中《听说桐岛要退部》位列榜单第二名。2013年,中国电影也在某种不经意间迎来了一次青春风暴。相对于有着悠久创作历史的日本青春片,中国青春片的创作无疑还略显稚嫩。虽然同处儒家文化圈,但是日本青春片与中国青春片却表现出了不同的艺术取向。本文选取两部同是展现高中生青春生活的电影《听说桐岛要退部》与《青春派》,意图透过对它们不同艺术风格的探析为当下中国内地正在蓬勃发展的青春片寻求一些启示。

摘要：为了解决大型团体表演中创意预期与创意效果呈现不一致的问题,采用大规模人群仿真技术实现了表演过程中演员行为的仿真,采用层次细节绘制、基于图像绘制、预渲染光影以及几何体实例化等方法实现了表演场面的高效绘制。实现了一个以虚拟现实平台Virtools为载体的数字表演仿真系统,该系统对大型团体表演的整个过程进行了仿真,使编创人员在创意初期就能对创意的呈现结果有直观认识。实验结果表明,该系统为大型团体表演编创人员进行创意编排、创意效果预览提供方便,为艺术创意完美展现于大型团体表演中提供了可能。