邮轮舱室瞬态噪声的时域与频域数值计算方法

Time domain and frequency domain numerical calculation methods for transient noise of cruise ship cabins

  • 摘要:
    目的 旨在探索瞬态激励下舱室瞬态噪声的高效精确数值计算方法。
    方法 以某邮轮居住舱室为对象,分别构建在声−振耦合模式下时域及频域舱室瞬态噪声数值计算模型,通过对比瞬态声激励及瞬态声与力激励联合作用下舱室瞬态噪声数值计算结果,探讨时域和频域2种计算方法在精度、效率、求解规模和建模难度等方面的差异。鉴于瞬态激励谱的频率范围较宽,给出多源激励下舱室瞬态噪声的数值计算方法,并开展实船试验。
    结果 结果表明,舱室瞬态噪声数值结果与试验结果的声压级总级误差在3 dB以内,验证了所提数值方法的有效性。时域法和频域法的计算精度相当,时域法的计算效率高于频域法,但建模难度要高于频域法。瞬态空气噪声源的影响范围比瞬态结构振动源的影响范围小。
    结论 所提方法能较精确地预报大型邮轮舱室瞬态响应,可在船舶舱室设计阶段预测舱室瞬态噪声,降低设计成本。

     

    Abstract:
    Objective The purpose of this paper is to explore an efficient and accurate numerical calculation method for cabin transient noise under transient excitation.
    Method First, numerical calculation models of cabin transient noise in the time domain and frequency domain under the vibro-acoustic coupling mode are established respectively. By comparing the numerical calculation results of cabin transient noise under transient acoustic excitation and transient acoustic-force excitation, the differences between the two methods in computational accuracy, efficiency, solution scale, and modeling difficulty are discussed. Considering the broadband characteristics of transient excitation, a full-band numerical calculation method for cabin transient noise under multi-source excitation is given and a real ship test is carried out.
    Results The results show that the total level error of cabin transient noise obtained by the test results and recommended numerical method is within 3 dB, which verifies the effectiveness of the numerical method proposed in this paper. The computational accuracy of the time-domain and frequency-domain methods given in this paper are comparable, with the time-domain method showing higher computational efficiency than that of the frequency-domain method, but also higher modeling difficulty. The influence range of transient air noise sources is smaller than that of transient structural vibration sources.
    Conclusion The method proposed herein can accurately predict the transient response of large cruise ship cabins and transient noise in the design stage of ship cabins, thereby reducing the design cost.

     

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