某无人机激光雷达隔振设计与试验测试

在无人机勘测、航空救援及电力巡检等任务中,激光雷达是一种必备的技术手段。由于无人机在飞行过程中激光雷达将受到复杂的振动工况,为了保证其正常使用和高精度工作,必须对激光雷达进行隔振设计。通过对无人机进行飞行试验得到激光雷达安装位置的振动响应信号;根据隔振理论设计了一款橡胶隔振器,并使用时间积分的方法进行了数值模拟;开展了隔振系统的振动试验测试,获取了激光雷达上某点的响应曲线。分析与测试结果表明:隔振器在x,y方向隔振性能均能达到90%,在z方向上隔振性能达到80%以上。仿真与试验结果一致性好,能够满足该无人机激光雷达系统的使用环境要求。

三线阵航摄仪摆扫机构的振动分析与研究

应用有限元分析技术对三线阵航摄仪摆扫机构进行力学结构分析后,利用6.5t振动台做空间环境试验验证三线阵航摄仪的摆扫机构设计的合理性。首先,通过有限元分析技术获得摆扫机构承受的最大应力和最大变形,然后,进行有无减震器的两种状态下的摆扫机构Z、Y两个方向的振动试验。通过试验表明,在满足静力学要求的随机振动试验环境下,不带电、稳速控制和摆扫轨迹控制的角速度精度均方根值没有明显差别;随机振动试验环境下,摆扫轨迹控制的角速度精度均方根值在可靠范围内,满足总体指标要求。因此,通过有限元技术以及振动试验可以有效的验证三线阵航摄仪摆扫机构在工作时,产生的振动不会影响摆扫机构控制系统的精度。

动车组行李架的受力及试验研究

动车组行李架是在动车内部起着重要作用的一种结构,利用Creo3.0软件对行李架整体结构模型进行三维设计。通过ANSYS Workbench17.0对行李架模型的结构静力学分析,得到行李架的总变形云图。对行李架进行实际的静加载试验,验证行李架静力学分析的可靠性。利用电动振动试验系统对行李架进行一系列的振动测试试验,验证行李架的试验可靠性及投入生产的可行性。

Seismic Retrofit of Masonry Buildings with Polymer Grid

The performance of masonry walls reinforced using innovative polymer grids embedded into thin plaster layers as a tool for the seismic enhancement of brick masonry buildings has been investigated by experimental tests. A number of diagonal compression, shear compression and out-of-plane tests were executed on sample panels; experimental activities included pseudo-dynamic and shaking table tests on infills and reduced scaled building mock-ups, respectively. The results of the experimental activities are presented and discussed. Experimental campaigns have been supported by theoretical and numerical investigations; based on the experimental data and on the results of detailed numerical simulations, simplified models for the design of the retrofitting intervention are hereinafter proposed. The models：, calibrated on the experimental evidence, properly consider the collapse mechanisms as well as the grid effect in the evolution of the above mentioned mechanisms.