Reduction of structure-borne noise in hydraulic power unit with elastic mounting by evaluating structural acceleration level
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In naval vessel equipment, airborne and structure-borne noise are ultimately transmitted to the hull and then propagated in water, thus increasing their exposure to the enemy. The noise level is also a critical factor affecting the comfort of crew members. Airborne and structure-borne noise are strictly managed based on US Navy standards, with low vibration and noise as the basic quali-ties of naval vessel equipment. In this study, the causes of excessive vibration owing to the rotational motion of the motor and recip-rocating motion of the hydraulic pump in the hydraulic power unit were analyzed via a structure-borne noise test. A study on reduc-ing the structure-borne noise of the hydraulic power unit is conducted by altering the design of the hydraulic tank. A modal analysis of the hydraulic tank is performed to avoid the frequency that exhibits a high acceleration level in the structure-borne noise evalua-tion. A harmonic analysis is performed to verify the reduction in structure-borne noise. The effectiveness of the improved design change is verified by confirming that the acceleration level is reduced. Then, the vibration characteristics are identified using finite element analysis (FEA). It is confirmed that FEA is effective in reducing the structure-borne noise in the final test evaluation, thus validating the modified design.
Abstract
In naval vessel equipment, airborne and structure-borne noise are ultimately transmitted to the hull and then propagated in water, thus increasing their exposure to the enemy. The noise level is also a critical factor affecting the comfort of crew members. Airborne and structure-borne noise are strictly managed based on US Navy standards, with low vibration and noise as the basic quali-ties of naval vessel equipment. In this study, the causes of excessive vibration owing to the rotational motion of the motor and recip-rocating motion of the hydraulic pump in the hydraulic power unit were analyzed via a structure-borne noise test. A study on reduc-ing the structure-borne noise of the hydraulic power unit is conducted by altering the design of the hydraulic tank. A modal analysis of the hydraulic tank is performed to avoid the frequency that exhibits a high acceleration level in the structure-borne noise evalua-tion. A harmonic analysis is performed to verify the reduction in structure-borne noise. The effectiveness of the improved design change is verified by confirming that the acceleration level is reduced. Then, the vibration characteristics are identified using finite element analysis (FEA). It is confirmed that FEA is effective in reducing the structure-borne noise in the final test evaluation, thus validating the modified design.
참고문헌 (15)
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