The frequency spectrums of lift coefficients and the unsteady pressure difference coefficients at(different) s.

The unsteady aerodynamic coefficient of ground wind load for booster supported launch vehicles

In this paper we consider the following class of linear recurrence with variable coefficients with two indicesu i,j =f(i,j)u i-1,j-1 +g(i,j)u i-q,j-q +h(i,j), u i,0 =c i,0 ,u 0,j =c 0,j (i,j=0,1,…),u i,j =0(i<0 or j<0),where i,j=1,2,…,q≥2,f(i,j),g(i,j) and h(i,j) (i,j≥1) are variable numbers,c i,0  and c 0,j (i,j=0,1,…) are vrbitrary constants.

In this paper we consider the following a kind of the homogeneous recurrence of variable coefficients with two indicesui,j=f(i,j)ui-1,j-1+g(i,j)ui-q,j-qui,0=ci,0,u0,j=c0,j(i,j=0,1, .

In this paper we consider tetrachoric homogeneous difference equation with variable coefficients Where n>0, p>r>1,a.

The unsteady aerodynamic and moment characteristics of the models and the unsteady wall pressure are measured.

Back analysis of non-stationary parameters of rock creep model based on chaos particle swarm optimization algorithm;

A new non-stationary parameters creep model of rocks is presented.

After relerant parameters in the concatenated governing system are analyzed under the velocity current double shrouded control the functions of the system after the conventional treatment of non-stationary parameters are also analyzed.