噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
4期
71-76
,共6页
振动与波%流体载荷%自由阻尼板%阻尼损耗因子%谱有限元法%三维弹性理论
振動與波%流體載荷%自由阻尼闆%阻尼損耗因子%譜有限元法%三維彈性理論
진동여파%류체재하%자유조니판%조니손모인자%보유한원법%삼유탄성이론
vibration and wave%fluid loading%unconstraint damping plate%damping loss factor%spectral finite element method%three-dimensional elasticity theory
结构的阻尼损耗因子是潜艇降低水下辐射噪声的重要参数。为此，采用谱有限元法以计算流体载荷作用下的自由阻尼板的结构损耗因子，探讨辐射损耗因子同功率转换系数间的关系；然后使用谱有限元法比较了含流体和不含流体的自由阻尼板的结构损耗因子的差异，使用能量法对相关计算结果进行验证；最后使用三维模型对流体载荷作用下的自由阻尼板的功率转换系数进行了计算，进而分析功率转换系数同阻尼层杨氏模量、阻尼层厚度、阻尼层材料损耗因子等参数的关系。研究发现：在低于第二阶弯曲波产生频率的频段范围内，无流体时的损耗因子小于有流体的自由阻尼板；从频段平均的角度来看，功率转换系数在低频存在较大峰值，在高频变化较为平缓且数值较小；实际潜艇在流体载荷下主要通过改变结构的阻尼来改变其辐射的阻尼损耗因子。分析结果对于潜艇结构阻尼的优化设计有参考价值。
結構的阻尼損耗因子是潛艇降低水下輻射譟聲的重要參數。為此，採用譜有限元法以計算流體載荷作用下的自由阻尼闆的結構損耗因子，探討輻射損耗因子同功率轉換繫數間的關繫；然後使用譜有限元法比較瞭含流體和不含流體的自由阻尼闆的結構損耗因子的差異，使用能量法對相關計算結果進行驗證；最後使用三維模型對流體載荷作用下的自由阻尼闆的功率轉換繫數進行瞭計算，進而分析功率轉換繫數同阻尼層楊氏模量、阻尼層厚度、阻尼層材料損耗因子等參數的關繫。研究髮現：在低于第二階彎麯波產生頻率的頻段範圍內，無流體時的損耗因子小于有流體的自由阻尼闆；從頻段平均的角度來看，功率轉換繫數在低頻存在較大峰值，在高頻變化較為平緩且數值較小；實際潛艇在流體載荷下主要通過改變結構的阻尼來改變其輻射的阻尼損耗因子。分析結果對于潛艇結構阻尼的優化設計有參攷價值。
결구적조니손모인자시잠정강저수하복사조성적중요삼수。위차，채용보유한원법이계산류체재하작용하적자유조니판적결구손모인자，탐토복사손모인자동공솔전환계수간적관계；연후사용보유한원법비교료함류체화불함류체적자유조니판적결구손모인자적차이，사용능량법대상관계산결과진행험증；최후사용삼유모형대류체재하작용하적자유조니판적공솔전환계수진행료계산，진이분석공솔전환계수동조니층양씨모량、조니층후도、조니층재료손모인자등삼수적관계。연구발현：재저우제이계만곡파산생빈솔적빈단범위내，무류체시적손모인자소우유류체적자유조니판；종빈단평균적각도래간，공솔전환계수재저빈존재교대봉치，재고빈변화교위평완차수치교소；실제잠정재류체재하하주요통과개변결구적조니래개변기복사적조니손모인자。분석결과대우잠정결구조니적우화설계유삼고개치。
Spectral finite element method is developed for calculating the structural loss factor of an unconstrained damping plate with the fluid loading considered. The relationship between the radiation loss factor and power conversion coefficient is analyzed. Then, the structural loss factor of the unconstrained damping plate considering the fluid loading is compared with that of the plate without considering the fluid loading. The results are verified by using the energy method. Finally, the power conversion coefficient of the underwater unconstrained damping plate is calculated using three-dimensional elastic model. Variation law of the power conversion coefficient with the variations of the Young's modulus, thickness and the material loss factor of the damping layer is discussed. The study shows that within the frequency band below the second-order bending wave’s starting frequency, the structure loss factor of the unconstrained damping plate without fluid loading is less than that with fluid loading. From the perspective of the frequency average, the power conversion coefficient has large peaks in the low frequency range, and it varies gently and has small values in the high-frequency band. The radiation damping loss factor of the actual submarines under the fluid loading can be changed by changing the structure loss factor. Results of the study may have some reference values for the optimal design of structural damping for submarines.
