Fly-by-Pi: Open source closed-loop control for geotechnical centrifuge testing applications.
Fly-by-Pi: Open source closed-loop control for geotechnical centrifuge testing applications.
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DOI：
10.1016/j.ohx.2020.e00151
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发表时间：
2020-10
期刊：
影响因子：
2.2
通讯作者：
Da Silva Burke TS
中科院分区：
文献类型：
--
作者：
Broekman A;Willem Jacobsz S;Louw H;Kearsley E;Gaspar T;Da Silva Burke TS
在土工离心机中成功集成开源硬件。土工离心机中的侧向加载和块体洞穴开采控制器。土工离心机中的单调和循环加载控制器。用于土木工程物理模型研究的Raspberry Pi集成。土工离心机是在受控的实验室环境中对复杂的土工问题进行物理建模的宝贵工具。与全尺寸测试相比，比例模型的建造和仪器具有成本效益，并且当在土工离心机中以增加的离心加速度进行测试时，能够复制全尺寸应力-应变土壤行为。模拟器需要能够在高加速度下运行的专用硬件和仪器。这样的硬件是昂贵的，几乎总是专门建造的，并且通常依赖于商业的、封闭源数据采集系统、硬件和控制系统。本文展示了一种新颖的、多功能的、低成本的、开源的记录器和控制系统，该系统与现有的离心机硬件并行工作。这种解决方案被称为Fly-by-Pi，是使用Raspberry Pi微型计算机开发的。该系统提供了闭环控制的线性致动器的能力，在循环，单调，或静态负载或位移控制。控制机构可以根据实验要求重新编程，即使在离心机中飞行期间也是如此。三个独立的实验，其中包括飞行的Pi控制器作为一个关键组成部分，在他们的操作。基于这些实验中获得的经验，作者鼓励在极端测试环境中广泛采用开源硬件解决方案。
Successful open source hardware integration in a geotechnical centrifuge. Lateral loading and block cave mining controller in a geotechnical centrifuge. Monotonic and cyclic loading controller in a geotechnical centrifuge. Raspberry Pi integration for civil engineering physical model studies. Geotechnical centrifuges are valuable instruments for physical modelling of complex geotechnical problems in a controlled laboratory setting. In comparison to full-scale testing, scaled models are cost effective to construct and instrument and, when tested in a geotechnical centrifuge at increased centrifugal accelerations, are capable of replicating full-scale stress–strain soil behaviour. Centrifuge modellers require specialised hardware and instruments capable of functioning under high accelerations. Such hardware is costly, nearly always purpose built, and often rely on commercial, closed-source data acquisition systems, hardware and control systems. This paper demonstrates a novel and versatile, low cost, open source logger and control system that works in parallel alongside existing centrifuge hardware. This solution, termed Fly-by-Pi, was developed using the Raspberry Pi microcomputer. The system provides closed-loop control of linear actuators with the ability to operate in either cyclic, monotonic, or static load- or displacement-control. The control mechanism can be reprogrammed according to experimental requirements, even during flight in the centrifuge. Three independent experiments are described which included the Fly-by-Pi controller as a key component in their operation. Based on the experience gained during these experiments, the authors encourage wide-spread adoption of open-sourced hardware solutions in extreme testing environments.