Structure Dynamic Performance And Analysis Of Interior Acoustic Field Of Armored Vehicles

The noise control of armored vehicle is a practical and difficult problem.Armored vehicles, the armored mechanized military equipment, is the high mobilityvehicles with armor protection. It enables fast attack, large depth transcendence incomplex geographical environment. In this complex driving conditions, the soldiersmust maintain a good state of mind and a quick reaction, but the car in the stage ofChina’s equipment tracked armored vehicles up to120dB maximum noise level. Farmore than the noise standards, crews are difficult to ensure the operational status inarmored locomotive. So the problem of noise control must be taken seriously enough,what we have to do is to analyze the vibration characteristics of the body structure andinterior noise distribution case. Only in this way we can do the noise reductionprocessing for armored vehicles accurately and reasonably.Create the body structure finite element model and process the modal analysis inANSYS, and process the experimental modal analysis. By comparing with the testmode shapes of the vibration results and practical acoustic modes to verify theaccuracy of the finite element model; Create the tune finite element model to observethe natural frequencies and mode shapes by processing acoustic modal analysis,understanding of the acoustic characteristics of the acoustic finite element model;Create the sound-solid coupling model and process coupling analysis, by comparingthe acoustic modal vibration mode before and after coupling, we can find the acousticcharacteristics of the cavity and the body structure is closely linked to the couplingcase the acoustic characteristics can be changed by changing the body design;Processing harmony response analysis in ANSYS, to get the displacement-frequencycurve of each test point under the engine and road excitation, then import the result asa boundary condition into Virtual.Lab Acoustics acoustic module software. Select the specific field point, calculate the non-coupling and coupling car sound fielddistribution and frequency response respectively, and provides a theoretical basis forthe next control noise.