振动筛毕业论文外文文献翻译

振动筛毕业论文外文文献翻译内容摘要：

ating screen is shown in center of gravity, is taken as the origin of a rectangular coordinate system at static equilibrium, in accordance with rigid motion on the plane [12].Simultaneous differential equations in generalized coordinates using center of gravity coordinates,(x,y),and the swing declination angle, θ ,may be written as where M is the mass of the vibrating screen’s the moment of inertia of M relative to the center of gravity,O。 x and y the displacements in the x and y0directionas。 x and y the velocities in the x and y directions’ and y the accelerations in the x and y directions。 is the swing angular displacement。 α the installation angle。 fx,f yond father damping coefficients in the x,y and directions。 x k and k the stiffness coefficients of the supporting spring along the x and y directions。 A0 the amplitude of the exciting force, given by2 0 A =mrω, where r is the radius of eccentricity the mass of the eccentric block and the exciting angular frequency。 L1 and L2 the distances between each supporting spring and the center of gravity’s the distance between the rotating center of the eccentric block and the center of gravity。 and,βthe included angle between the l and x directions. The damping force is rather small and can be neglected. Then Eq. (1) can be simplified to Eq.(2). 4 Motion and screening effect analysis of a vibrating screen with variable elliptical trace Analysis of the motion parameters Multiple degreeoffreedom vibration theory was used to find a stable solution for the forced vibration [13],as follows: When E 2 S 2 +C 2 H 2 +2 ESCH=0, the trace of point D is a line. When E =Sand C =H, the trace of point D is a circle. In general. (6) expresses the equation of an xoy coordinate was rotated γ degrees anticlockwise to give a new set of x ′ oy′coordinates. A standard elliptical equation was then obtained after eliminating D D x y in Eq.(7). From this we know that some points on the screen move in a line or a circle while others move in an ellipse .As long as the relative position of the rotating center of the eccentric block and the center of gravity are properly adjusted, variable elliptical motion of the screen will be obtained .This provides a reasonable throwing index and material delivery velocity and improves screening efficiency. Analysis of motion trace and screening efficiency The stable solution of a vibrating system, in terms of the vibrating screen, can be given by The equations of motion for any point on the vibrating screen are Eq.(8)shows that the center of gravity traces an approximate circle and that the amplitude in the horizontal and vertical directions is between mm and 5 shows how the center of gravity moves in three degrees of gives the angular phase difference between the horizontal and vertical directions as well as the amplitude of the swing angle. 5 Conclusions 1)A new vibrating screen with variable elliptical motion trace was proposed according to the principle of screening process with constant bed points on the vibrating screen trace different elliptical motion pattern agrees well with the ideal motion characteristic for a screening surface. Thus,screening capacity and process efficiency can be increased. 2)A theoretical kinematic analysis of the vibrating。