Karachun V.V, Mel’niсk V. N.

National Technical University of Ukraine «KPI»

THE DEvICE FOR TESTING PRODUCTS ON MULTICOMPONENT VIBRATION ON SINGL-COMPONENT VIBROEXITER

Enhancing operational capacity of prior device is achieved through the formation of not only progressive, but elliptical vibration of installing the product that more accurately reflects the natural factors. These properties are realized through the forced movement of spherical basis.

Plate 1 for this is set on the upper end of rod 11 (fig.1). Commutator 17, made, for example, as the repeater, returns to the desired angle a leash 18, which through the longitudinal guide channels 19 give rotary motion threaded circular sliding elements 8 of shart, moving them in a longitudinal direction so that their edges 9 created discrete-continuous conical surface 10 with the chosen angle of inclination of generatrix, with the condition

where S - the distance between the plane of the end of first bushing and the original plane; - external radiuses of circular elements; n - number of circular elements. Simultaneously, commutator 17 with consecutive connection of solenoid winding 14 to the current source provides plate 1 through the hinge 16 of spherical motion relatively the shurt by moving the mandrel 15. This is achieved provided matches of the geometric center of plate 1, the peak of cone 10 and the center of the spherical hinge 12. For satisfactory operation, the number of solenoid must be at least four .

Vector of vibration acceleration of table decomposes on the plate 1 into two components and with the orthogonal axes. Modules of vectors can be defined with a certain mathing of angle value of conical surface 10 for plate 1 are in the ratio

;

;

.

Acceleration provides a progressive vibration of device in the direction perpendicular to the plane of plate 1. In-plane of plate 2 this vector can be represented by two components - and , and

;

;

,

where .

Here і - orthogonal axes in the plane of the plate 2. On the side facets 7 of triangular prism 3 this vector is decomposed into three mutually perpendicular components. There is obvious relationship:

;

;

;

where .

Acceleration due to spherical motion of plate 1 by signal of commutator 17 and depending on the value of instantaneous angular velocity of spherical motion, decomposes into two components in the plane of plate 1 - and . That is, there are relations:

;

;

,

where .

In plane of plate 2 vibration accelerations decomposes into two mutually perpendicular components, and , and

;

;

.

On the contrary, in plane perpendicular to the plane of the plate 2, there are two components and , and

;

;

.

Finally, on the lateral face 7 of prism 3, acceleration expandes into and :

;

.

Thus, the vector of acceleration due to spherical movement of plate 1, changes its position in space and creates the opportunity to reproduce a multi-component translational and elliptic vibration at single-component vibration exciter.

In fig. 2 diagrams of spatial orientation vector of elliptical vibration for three separate cases are shown –

, , .

Here it is marked: - angular velocity of rotation of plate 1; - angular frequency vibration exciter; dashed line outlines bypass of vector of acceleration for the negative half-time.