【作者】 余桐奎；

【导师】 时胜国；

【作者基本信息】 哈尔滨工程大学 ， 水声工程， 2009， 硕士

【摘要】 复杂系统中主要噪声源的识别、分离、量化对系统噪声状况评估和噪声控制有着重要意义,鉴于同时采用多种方法可以确保最后分析结果的更大置信度,本文围绕这一思路开展了相关理论和试验研究工作。本论文基于多输入/输出系统模型,采用偏相干理论、层次诊断方法和主成分分析方法对复杂机械系统主要噪声源分离量化进行理论和试验研究。首先,以多输入单输出系统为例,分析了系统输入输出之间的基本关系,推导了条件功率谱密度函数和偏相干函数的基本公式,建立了将条件功率谱函数和偏相干函数相结合的方法,并进行了仿真计算研究。其次,对主成分分析方法进行理论研究,提出了基于主成分的振动噪声源分析方法,进行了仿真计算研究,并利用该方法对船用立式离心泵的振动试验数据进行了振动源特性分析,分析结果表明,该方法可以快速、准确地给出振动源强弱的准确排序和相互之间的耦合情况。另外,还根据层次分析理论建立了基于相干函数和偏相干函数的噪声源层次诊断方法,给出了层次诊断流程;仿真计算结果表明,基于偏相干函数的噪声源层次诊断方法是解决具有强相干性多源系统的噪声源诊断问题的一种有效方法。最后,在吉林松花湖进行了船用主机的振动与噪声综合测试试验,利用主成分分析法对主机系统各振动源进行了分析,给出了各振源的量化结果,并同时也对主机系统振动源的主传递路径也进行了分析,给出了分析结果;通过各激励源的基频计算和条件谱分析,给出了各振源对辐射噪声贡献频率或频率范围,并利用基于偏相干函数的噪声源层次诊断法给出了主机各振源对辐射噪声贡献大小的排序结果。综合分析结果表明,同时采用多种方法进行复杂机械系统的噪声源分离量化比单一方法更准确、更全面。更多还原

【Abstract】 The identification, separation, quantification of the main noise source in complex systems is of great significance to system noise assessment and noise control. Due to using a variety of ways simultaneously may ensure that the final results of the analysis is of greater degree of confidence, this paper will carry out the relevant research work by focusing on the idea mentioned above.Based on multi input/output model, first, put multi input single output system as. an example, this paper analyzes some of the basic input-output relations, derives the basic formulas of function of conditions in the power spectral density and partial coherence function, gives the combing method of conditions of the power spectral function and the partial coherence function, and makes the relevant simulations. Secondly, by use of the principal component theory, the paper puts forward the source of vibration and noise analysis method based on principal component. Through this method, it has carried out exploratory simulation study. By combination of simulation results of the study, marine centrifugal pump of the vibration test data were analyzed. The results show that this method can quickly and accurately give the exact strength of the vibration signal sequencing, phase relationship and coupling between signals, establishes noise source level diagnostics based on the coherence function and the partial coherence function according to AHP theory, and gives the flow process and simulation results of the level of diagnosis. The results show that in order to solve the noise source diagnostic problems of multi-source system which has a strong coherence, the noise source level of diagnostic methods based on the partial coherence function is an effective way. Finally, a marine host integrated vibration and sound tests is held on the Songhua Lake in Jilin, and by using of the principal component analysis, it gives the quantitative results, the main results of the analysis of the vibration transmission path of the local oscillator. According to the calculation of the mechanical excitation of the fundamental frequency spectrum analysis of numerical and combination of the conditions of spectral analysis, the paper gives the local oscillator noise contribution of the radiation frequency; gives the host of the local oscillator noise contribution of radiation to sort size based on partial coherence analysis of the noise source level diagnostics. Comprehensive analysis of results showed that there are obvious advantages by using a variety of methods of diagnosis comparing to a single noise source diagnostic methods.更多还原