Committee to Oversee the Design and Performance of an Earthquake Simulator for the National Geotechnical Centrifuge in Davis, CA

加州大学戴维斯分校正在为他们的国家土工离心机(NGC)设计地震模拟器。这个奖项的目的是支持一个三人委员会来监督这个模拟器的设计。委员会成员由一名岩土工程师组成，该工程师在地震模拟器的设计、安装和操作方面具有专业知识，该模拟器的工作原理与正在设计的地震模拟器相同；一名结构工程师，具有结构动力学方面的专业知识，特别是在分析和性能的统计方面；以及在旋转设备(包括电机和驱动系统)的设计和分析方面经验丰富的机械工程师。监督涉及技术研究和选定的实验，其中一些由委员会进行，另一些由加州大学戴维斯分校进行。该委员会的目标是：(A)通过以下计算，审查NGC的运作条件和能力整个系统的振型和频率；以及通过使用仪器离心机进行选定的实验；(B)评估拟议的地震模拟器单独行动的能力；(C)通过实验和数值模拟检查安装的模拟器与另一台离心机的相互作用组件；(D)综合上述结果以评估离心机旋转时系统的预期抖动性能，所产生运动的重复性和可靠性、设备的安全性以及振动系统的运行对离心机疲劳寿命的影响。

The University of California at Davis is in the process of designing an earthquake simulator for their National Geotechnical Centrifuge (NGC). The purpose of this award is to support a three-person committee to oversee the design of this simulator. The committee members consist of a geotechnical engineer having expertise in the design, installation and operation of an earthquake simulator having the same operational principle as the one being designed; a structural engineer with expertise in the dynamics of structures, especially with respect to statistical aspects of the analysis and performance; and a mechanical engineer experienced in the design and analysis of rotating devices, including motors and drive systems. The oversight involves technical studies and selected experiments, some of which are performed by the committee, and some by the University of California at Davis. The goals of this committee are to: (a) Examine the operational conditions and capabilities of the NGC through calculations of the modal shapes and frequencies of the entire system; as well as through selected experiments using the instrumented centrifuge; (b) Assess the capabilities of the proposed earthquake simulator, acting alone; (c) Examine through experiment and numerical simulations the interaction of the mounted simulator with the other centrifuge components; (d) Integrate the above results to assess the expected shaking performance of the system with the centrifuge rotating, the repeatability and reliability of the motions generated, the safety of the facility, and the effect of the operation of the shaking system on the fatigue life of the centrifuge.