Experimental verification of identification of location and force history of a point impact on rectangular composite laminated plates is made in order to establish the identification method proposed previously. In experiments, a point impact on a rectangular composite laminated plate supported at one side was produced by an impulse hammer and the acceleration at points on the surface of the plate was measured by small accelerometers attached on the plate. It is found that by choosing appropriately the number of vibration modes in the identification method, the identification results of the location and force history of the point impact are in good agreement with the exact ones. This may imply that the possibilities of the practical application of the identification method can be expected.
In a previous paper, the authors presented the identification method of locations and force histories of point impacts on laminated composite flat plates by using the measured values of acceleration. This paper deals with an attempt to extend the method so as to apply to identification of point impacts on laminated composite curved panels. Numerical identification results are obtained for the single point impact and double point impacts on cross-ply laminated composite curved panels. The validity of the identification method to laminated composite curved panels is verified by comparing the identification results with exact ones. In addition, when the number of point impacts is unknown, a method to decide the identification results is proposed. Several numerical examples are considered to ascertain the validity of the proposed method.
A simulation method of cylindrical plunge grinding processes is described, which has considered successive change of workpiece shape due to core elements of grinding machine. Each element is modeled and integrated in the simulation procedure. The validity of the method is shown by comparing predicted and experimental results of grinding force histories, workpiece diameter histories and final workpiece shapes. The method is also applied to reduce grinding time by controlling infeed rate. The new process with reduced time is derived and the practicality of the method is verified by conducting experiments.
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