小弟新手，用hypermesh做前處理，然后導(dǎo)入abaqus求解，是靜力學(xué)問題。然后就報好多這樣的錯：

No bulk modulus is defined for acoustic element 1539867 instance part-1-1. All acoustic elements must have nonzero bulk modulus defined using *material and *acoustic medium.

Initialization of acoustic element material point data for element 401 has failed because no bulk modulus exists for thiselement.

在abaqus里面重新設(shè)置材料還是這樣。求大神幫幫忙。