¶ 相关文件：Modal Analysis And Visualisation
Background
We have developed some simple modal analysis tools in-house for our own purposes. More recently, it has come to our attention that Redbull Racing have been using the 7-poster to perform modal analysis on the car chassis using a 3rd party consultancy. The consultancy not only provided the software and hardware, but also some expertise and experience with other customers.
Modal Analysis Fundamentals
Identify geometric points (or nodes) on a structure that can describe a wire-frame model of the structure in a 3D diagram.
Instrument the structure at these nodes with accelerometers or strain guages in the x, y and z-directions.
Provide an input (preferably with our rig!) which is usually a sweep, and calculate the frequency response of each of the nodes WRT the sweep input.
Use the amplitude and phase data from the frequency response to animate the bending modes of the structure at given frequencies.
Our Strengths
Developing 3D animation in Matlab is relatively easy. Low cost.
Reactivity and flexibility. We could receive data files from anywhere in the world and send back animations and transfer functions. Consultancy work.
A substantial proportion of testing time is validating test data. Same principals as ICS.
Requires good instrumentation expertise.
Frequency domain analysis.
Our Weaknesses
We are NOT experts in structural integrity
This is not full blown Modal Analysis
Requires strong data management and archive capabilities that Pulsar doesn't have. Investment in developing this capability will benifit our product as a whole.
Our Proposal
Geometric data is imported from Excel (or from Solid Works in the XML format) in to the Modal Analysis software module.
Analogue Inputs and Datalogger will log response data at each node.
Test automation using EZFlow? to configure datalogger, run sweep and launch analysis software.
May be more efficient to save Modal analysis tests as frequency data.