Abstract
The investigation of structure dynamic behavior can be done by finding modal properties, which are based on the relation of force and vibration response. The information about exact force value is in most application unknown, but the investigation can be done for unit magnitude of force. In case of using modal exciter, the force applied to structure is transferred by connection between modal exciter and structure. The stiffness of connection part can affect the dynamic behavior and change the modal properties, or response of investigated part, because of additional modal properties of connection part. This article is focused on the influence of two different rod stiffness during modal properties identification. The modal exciter is used to find potential critical frequency during decreasing frequency. The affect is evaluated on the surface normal velocity as well as acoustic pressure. The stiffness of rod significantly affects the dynamic response of structure and based on that can add frequency, when the emitted noise is high.
Highlights
The product which is designated for using at dynamics loading should be developed with regard to operating conditions
The structure was excited by two different rods, which connected the modal vibration exciter and force sensor
The harmonic acoustics analysis is widely used at application, where regulations limits exist
Summary
The product which is designated for using at dynamics loading should be developed with regard to operating conditions. With increasing number of manufacturers, the increased requirements are placed on the final product by the customer, the manufacturer, as well as the regulations [1, 2]. The developing phase in a lot of cases consists of designing, numerical simulations and experiment [3]. These parts are connected to each other and take a few turns. The experiment and numerical simulations are performed on couple of designs simultaneously to compare the results and validate numerical approach. The experiment has irreplaceable place in the developing phase of product as well as at validation of methodology [4]
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