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"NASA Technical Reports Server (NTRS) 19860021597: Senstitivty Analysis And Optimization Of Nodal Point Placement For Vibration Reduction" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19860021597: Senstitivty Analysis And Optimization Of Nodal Point Placement For Vibration Reduction” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19860021597: Senstitivty Analysis And Optimization Of Nodal Point Placement For Vibration Reduction
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19860021597

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"NASA Technical Reports Server (NTRS) 19860021597: Senstitivty Analysis And Optimization Of Nodal Point Placement For Vibration Reduction" Description:

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A method is developed for sensitivity analysis and optimization of nodal point locations in connection with vibration reduction. A straightforward derivation of the expression for the derivative of nodal locations is given, and the role of the derivative in assessing design trends is demonstrated. An optimization process is developed which uses added lumped masses on the structure as design variables to move the node to a preselected location - for example, where low response amplitude is required or to a point which makes the mode shape nearly orthogonal to the force distribution, thereby minimizing the generalized force. The optimization formulation leads to values for added masses that adjust a nodal location while minimizing the total amount of added mass required to do so. As an example, the node of the second mode of a cantilever box beam is relocated to coincide with the centroid of a prescribed force distribution, thereby reducing the generalized force substantially without adding excessive mass. A comparison with an optimization formulation that directly minimizes the generalized force indicates that nodal placement gives essentially a minimum generalized force when the node is appropriately placed.

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