"I am a design engineer working on a multidisciplened project. I am trying to design a welded sheetmetal box that will contain a heat exchanger. The box is attached to a turbine that is producing a certain frequency. The turbine is used to create a gas flow through the heat exchanger. What formulas are there to predict the natural frequency of the sheetmetal box (if I coin stiffinening ribs or panels into the sheetmetal)? I can calculate the natural frequency of the flat panels but I have found no help in any further calculations or design guides. Any help would be appreciated. Thank you, Bill";
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