Relation between acoustical absorption coefficient and loss factor in reverberant field with statistical energy analysis(SEA);

Calculation of frequency and loss factor of composite sandwich structures;

The effects of additional magnets on the loss factor of a smart magnetic partially constrained layers clamped-clamped beam;

The results showed that the relaxtion rates of the test pieces aged at room temperature and 60 ℃ increased,but their thickness,break-down strain and tanδ changed little indicating that MVQ foam had better heat resistance;and the thickness and break-down strain of the test piece aged at 60 ℃ + loading decreased significantly,its relaxation rate in.

The results showed that the basic physical properties of test compound were similar to those of existent production compound;the rolling resistance and heat build-up of test compound decreased because of smaller tanδ at 40~100 ℃,and the ice and wet traction improved significantly because of greater tanδ at-15~+15 ℃.

Thirdly,the loss tangent and storage modulus for fiber reinforced concretes of 6 different ratios were measured in the range of.

Therefore,through the measurement for loss tangent or the viscous coefficient of material,the damping matrix of st.

The storage modulus and loss tangent of the different cement mortars after adding the silane - treated silica fume or as-received silica fume in the cement mortar were measured by the viscoelastic analyzer VA4000 at the temperature of -30-30℃ and frequency of 0.