A study on vibration transmission characteristics in lightweight auxiliary equipment isolation system

Objectives Marine power equipment vibration transmission is one of the sources of mechanical noise, the traditional ship with auxiliary equipment acoustic indicators with reference to the quality of the equipment grade, to the equipment foot vibration level for the vibration of the criteria, that is, under the constraints of the quality of the equipment under the strict control of the foot vibration level, and ultimately reduce the mechanical noise. However, the current application of permanent magnet auxiliary lightweight high-tech equipment, under the same power conditions, the lack of equipment quality to reduce the vibration transfer evaluation method. Methods Based on this, a single-degree-of-freedom isolation system model is used as an example, keeps the installation frequency of the equipment and the input impedance of the elastic base unchanged, researches the change rule of vibration transmission of the vibration isolation system, and takes the power flow as the evaluation index of the vibration energy, and solves the mathematical relationship between the vibration level of the foot of the lightweight equipment and the mass. Results It is shown that when the equipment installation frequency and base impedance are unchanged, the equipment mass reduction will lead to an increase in the vibration level of the equipment foot, while the isolation effect becomes better: equipment lightweight 50%, foot vibration acceleration increases 1.97 times; lightweight 90%, foot vibration acceleration increases 9.98 times. Conclusions If the installation frequency and base impedance are unchanged, there exists the law that the vibration level of the equipment foot of the lightweight equipment and transfer to the base of the vibration power flow increase, which provides a theoretical basis for the design of the relevant vibration isolation system and the improvement of the vibration evaluation of the lightweight equipment.