Vibration management in structures with mode degeneracy - enhancing the life of industrial Charge Air Coolers

该项目的灵感来自于减少增压空气冷却器的振动-一种热交换器，例如用于机车应用的热交换器，从而提高设备的寿命。这类结构的一个特点是，由于几个相同的部分，如冷却管，通过翅片或端板耦合在一起，有数学上的困难。这使得振动预测和管理问题极具挑战性。理论，计算和实验技术的结合将被用来了解这种结构的独特的振动行为（在技术文献中，这被称为“结构与模式简并”），并提供解决方案，以管理振动水平。候选人将制作这类热交换器结构的有限元模型，以了解发动机引起的振动行为。他们还将使用振动器的仪表锤机械激励结构进行测量，并对数字数据进行分析，以监测和抑制振动。最后，他们将调和结构振动测量与计算和理论预测。

The project is inspired by reducing vibration in charge air coolers -- a class of heat exchangers, such as those used in locomotive applications, and thus enhancing the life of the equipment. A feature of this class of structures is that there are mathematical difficulties due to several identical parts such as cooling tubes that are coupled together via fins or end plates. This makes the problem of vibration prediction and management extremely challenging. A combination of theoretical, computational and experimental techniques will be used to understand the unique vibration behaviour of such structures (in the technical literature this is known as "structures with mode degeneracy") and offer solutions to manage vibration levels. The candidate will make finite element models of this class of heat exchanger structures to understand the vibration behaviour as induced by engines. They will also make measurements by mechanically exciting the structure using an instrumented hammer of a shaker and carry out analysis of the digital data with an aim of vibration monitoring and suppression. Finally they will reconcile the structural vibration measurements with computational and theoretical predictions.