建筑出口对人员疏散影响的计算机仿真模拟及分析

针对人员疏散过程中在出口处出现瓶颈的现象,论文基于pathfinder软件研究了出口属性对疏散速度的影响.首先,通过建模及人员属性设置,建立了疏散仿真模型及不同数量的被疏散人群.其次,基于模型,研究了出口数量、位置及导流墙对疏散速度的影响.结果表明被疏散人员数量较少时,出口数量对疏散速度没有多大影响,疏散时间由被疏散人员到出口的最远距离决定,同时,导流墙对疏散有一定阻碍作用;当被疏散人员较多时,出口数量越少越有利于提高疏散速度;位于墙的两边出口比中间出口疏散速度更快;同时,导流墙可以有效提高疏散速度.研究成果对建筑的设计与管理及疏散策略的制定与实施有一定指导作用.

Parameter-dependent vibration-attenuation controller design for electro-hydraulic actuated linear structural systems

The problem of robust active vibration control for a class of electro-hydraulic actuated structural systems with time-delay in the control input channel and parameter uncertainties appearing in all the mass, damping and stiffness matrices is investigated in this paper. First, by introducing a linear varying parameter, the nonlinear system is described as a linear parameter varying （LPV） model. Second, based on this LPV model, an LMI-based condition for the system to be asymptotically stabilized is deduced. By solving these LMIs, a parameter-dependent controller is established for the closed- loop system to be stable with a prescribed level of disturbance attenuation. The condition is also extended to the uncertain case. Finally, some numerical simulations demonstrate the satisfying performance of the proposed controller.

Active vibration-attenuation controller design for uncertain structural systems with input time-delay

The problem of active vibration control for uncertain linear structural systems with control forces input timedelay is investigated in this study.First,the original structural equation is converted to a state-space model by utilizing the matrix transformation.Second,according to the obtained model and a special Lyapunov functional,a sufficient condition is achieved for the closed-loop system to be stable with a prescribed level of disturbance attenuation.Then,in terms of solving these linear matrix inequalities（LMIs）,the state-feed controller is achieved to stabilize the structural system with the performance ‖z‖2<γ‖ω‖2.Third,by introducing the rank-1 vector to describe the system uncertainties,the uncertain system description is obtained,and the stabilizing condition is extended to the uncertain case.Finally,examples are given to show the effectiveness of the proposed methods.

四旋翼飞行器与物联网技术的环境检测系统设计

环境质量检测是环境治理环节中最基础最重要的一个环节。传统的人工或半人工的检测可能会损害检测人员的身体健康,并且机动性能较差,无法快速的检测大范围的空气质量,因此,文中针对传统的检测方法提出改进,通过四旋翼飞行器结合物联网技术中的NB⁃IoT实现空气质量检测系统。四旋翼采用内外环的全局滑模鲁棒控制方法设计的控制律保证了系统的闭环稳定性。通过仿真实验表明,所提系统能够正常稳定工作,采集的数据精度在误差范围内,可达到预期设计要求。