Abstract
The previous paper derived the modal expansion of structural intensity for flexural vibration on a beam. The expansion is expressed by the superposition of modal terms composed of weight functions and cross-modal functions. The weight functions are determined by the natural frequencies and modes and the information of the excitation. The cross-modal function is evaluated by the spatial derivation of the modes. This paper discusses the properties of the cross-modal functions especially by the comparison with the vibration energy in modal space. It is also shown that the distributions of the cross-modal functions can be predicted by the product between the modes. It is useful in the case of the difficulty in evaluating the spatial derivation of the modes.
