Indirect testing method for equipment to excitation load of hull structure under vertical unbalance excitation force

Abstract

The invention aims at providing an indirect testing method for equipment to excitation load of a hull structure under vertical unbalance excitation force. The indirect testing method comprises the following steps of: installing a first group of vibration isolators on feet of tested equipment, and installing both the tested equipment and the vibration isolators on a rigid mass block; distributing an accelerator sensor at the feet of the tested equipment and at the top of the vibration isolators, and sequentially connecting a signal amplifier and a signal collection instrument; starting the test equipment and calculating the speed response value under the first group of vibration isolators; replacing the vibration isolators, and calculating the speed response value under a second group of vibration isolators, thus obtaining the turbulence force equivalent mass of the tested equipment. The tested equipment is arranged on the vibration isolators and then installed on a hull base which is equivalent to a spring and the rigidity mass block, thus finally obtaining the excitation force load of the tested equipment to the hull base. The indirect testing method is good in accuracy, simple and convenient as well as easy to operate, and high in controllability.

Description

technical field [0001] The invention relates to a method for measuring the excitation load, in particular to an indirect measurement method for the excitation load. Background technique [0002] Mechanical equipment is used as a vibration source, and its excitation load on the ship structure is a key parameter for quantitatively predicting the underwater radiation noise generated by the ship's mechanical system. It is of great significance to find an indirect measurement method for the excitation load of the ship structure, especially in the reduction of ship structure. field of vibration and noise reduction. However, there is currently no better way to solve this problem in the industry. The main reasons are as follows: On the one hand, due to the complexity of ship equipment and the real ship environment, it is difficult to directly measure the excitation of the ship base when the equipment vibrates. load. On the other hand, because the current equipment manufacturers on...

AI Technical Summary

Problems solved by technology

Document 5 describes the use of the basic principles of the finite element method and the admittance method to indirectly estimate the output excitation force of the mechanical equipment on the base. The premise is that the characteristics of the base remain unchanged, but different bases and different installation methods will Change the energy and contact force injected into the receiving structure, so this method also has a certain error, and the size of the error depends on the change of the base

Images