GOALI: Dynamic Modeling and Analysis of Complex Systems with Application to Elevator Systems

该项目的主要目标是：i）开发一种新的子结构方法，可以准确地确定复杂系统的动态响应，包括拉紧和/或松弛电缆的长度可变;和ii）理论和实验研究电梯系统在正常运行和高能量事件的动态。建议的研究整合和推进五个相关的研究领域：分布式结构振动，电缆动力学，平移介质动力学，柔性多体动力学和电梯系统动力学。子结构法精确地满足所有的内部和边界条件，并且可以精确地确定因变量的空间导数。该方法将与一种新的多体动力学方法一起使用，该方法使用欧拉角或欧拉参数以及工程应变作为大变形的索和梁的因变量，这可以显着减少因变量和单元的数量。新的方法将被用来解决具有挑战性的电梯系统的系统级动态建模和分析问题，并在奥蒂斯电梯公司的布里斯托测试塔实验验证。 为了满足高层建筑物的运输需求，对高速电梯的需求需要整个电梯系统的精确动态模型，以确保能够鲁棒地满足运动控制性能目标，同时实现上级乘坐质量。电梯密码是从哪里来的？规定性的？一个到？基于性能的？在这些高性能系统中，了解电缆和低阶动态组件之间的耦合动态是构建和优化这些高性能系统的关键一步;准确预测内部动态状态可以降低产品成本并提高性能。如果成功，这项研究将把电梯设计范式从目前的基于组件的方法转变为基于系统的方法，并使下一代摩天大楼的超高高速电梯设计成为可能。所开发的方法也可以应用于其他系统，如电缆机器人，系留卫星和太空电梯。 这项研究的结果将用于教育目的，供各级学生使用。电梯和其他系统的模拟将用于巴尔的摩地区服务不足的高中生的夏季教育计划。代表性不足的迈耶霍夫学者将被鼓励在PI进行研究？的实验室和在奥蒂斯。将组织一系列关于细长结构力学的国际会议，以扩大研究对科学界的影响。

The main objectives of this project are to: i) develop a new substructure method that can accurately determine the dynamic response of complex systems involving taut and/or slack cables with variable lengths; and ii) theoretically and experimentally investigate the dynamics of elevator systems during normal operation and high-energy events. The proposed research integrates and advances five related research areas: distributed structural vibrations, cable dynamics, translating medium dynamics, flexible multibody dynamics, and elevator system dynamics. The substructure method exactly satisfies all the internal and boundary conditions, and the spatial derivatives of the dependent variables can be accurately determined. The method will be used with a new multibody dynamics method that uses Euler angles or Euler parameters, and the engineering strain, as the dependent variables for cables and beams with large deformations, which can significantly reduce the numbers of dependent variables and elements. The new methodology will be used to resolve the challenging system-level dynamic modeling and analysis problem for elevator systems, and experimentally validated at the Bristol test tower at the Otis Elevator Company. The demand for higher-speed elevators to service the transportation needs of higher-rise buildings requires accurate dynamic models of entire elevator systems to ensure that motion control performance targets can be robustly met, while achieving superior ride quality. As elevator codes are moving from ?prescriptive? ones to ?performance-based? ones, understanding the coupled dynamics between cables and lower-order dynamic components is a crucial step in architecting and optimizing these high-performance systems; accurately predicting internal dynamic states can reduce product costs and improve performance. If successful, this research will shift the elevator design paradigm from the current component-based approach to a system-based approach, and enable the design of ultra-high rise, high speed elevators being proposed for the next generation of skyscrapers. The methodology developed can also be applied to other systems such as cable robots, tethered satellites, and space elevators. The results from this research will be adapted for educational purposes to students at all levels. Simulations of elevator and other systems will be used in a summer educational program for underserved high school students in the Baltimore region. Underrepresented Meyerhoff scholars will be encouraged to conduct research in the PI?s laboratory and at Otis. An international conference series on the mechanics of slender structures will be organized to broaden the impact of the research to the scientific community.