Research On Structure Vibration Acoustic Analysis And Noise Control Technology Of Shiploader

Currently, the researches of mechanical properties supporting capacity for shiploaders have mainly concentrated on the static structure and strength analysis, the dynamicbehavior analysis and research on structure vibration acoustic analysis and noise control ofthe ship loaders are rare in literature. And in the using process of ship loaders, thestructure vibration and noise caused by the transmission system have seriously influencethe use of equipment performance. A large port ship loader machine room structurevibration and noise is one of the important problems of the existing. Therefore theresearches of structure vibration acoustic analysis and noise control for ship loaders haveimportant theoretical significance and practical significance.Based on the finite element and boundary element methods, and commercial softwareplatforms, the structural-acoustic coupled system has been established. The prediction,analysis and control of low frequency noise are systematically studied in this article.Firstly, a theoretical and experimental study of the housing structure and the vibrationcharacteristics of the ship loader machine room have been done, based on the experimentalstudy, this paper analyzes the vibration source frequency characteristics of the room, andthe relationship between the structural vibration and noise, and deduced the ideal mediumsmall and medium-sized amplitude acoustic three-dimensional wave equation, laid thetheoretical basis for the structural-acoustic coupled system analysis.Secondly, using the finite element method to establish the SL6ship loader machineroom, the finite element model cavity model and structural-acoustic coupling model,which can realize to structural-acoustic coupling modal analysis and harmonic frequencyresponse analysis. In addition, the room wall thickness, the system damping coefficientand wall sound absorption coefficient are also been considered for the influence of thedynamic characteristics and the internal sound field.Finally, on the basis of the hoist room acoustic boundary element model, introducinga new method, the finite element and boundary element co-simulation, and introducing theconcept of panel acoustic contribution, calculated the wall plate vibration state of indoor noise contribution. Based on the calculation in the previous section, damping materialsand acoustic treatment, and certain changes to its structure have been done. And achieveda certain amount of noise reduction effect, provide some reference for vibration and noisecontrol engineering practice.