Barnett-Lothe's Matrices in multi-freedom vibration systems

For its eigenfunctions are similar with multi-freedom vibration equations,the Stroh's theory was extended to multi-freedom vibration systems.By using the Stroh's theory,the Barnett-Lothe's Matrices and the BarnettLothe's integral formula in multi-freedom system was given,which can be obtained from M,K,C matrices.This formula avoid studying eigenvalues of vibration equations.