SU1677554A1 - Vibration table resonator - Google Patents

Abstract

The invention relates to a technique for dynamic testing of products and provides the possibility of creating on the shaker table a series of signed impulses with pauses between them. The resonator mounted on the vibrostand is made in the form of a beam with hingedly supported ends, including the resonant branch 1 and the linear non-resonating branch 2 located in the plane of oscillations, which has a lower rigidity than the resonating branch. Beam branches are rigidly connected to each other by ends. Both supports of the ends of the beam are hingedly fixed. During one half-period of bending oscillations of the resonating branch, the non-resonating branch bends, resulting in a pulse, and during the other half-period, when a stretching force is applied to the ends of the non-resonant branch, its deflection is zero. 1 il.

Description

ABOUT

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The invention relates to a technique for dynamic testing of products, in particular, to resonators mounted on a shaker table to create a sequence of sign-wise pulses of increased amplitude.

The purpose of the invention is to create a sequence of signed impulses with a pause between them.

The drawing shows schematically the resonator.

The resonator is a beam made with two branches parallel in the plane of its oscillations — resonant branch 1 and straight linear nonresonant branch 2, rigidly connected to each other. The stiffness of the non-resonating leg 2 is less than the stiffness of the resonant leg 1. The beam is made with two pivotally fixed supports for fixing its ends on the shaker table (not shown). Each of the pivotally-fixed supports is formed by a stand 3 fixed on the shaker table with an axis 4 fixed in it, passing through the beam opening. The non-resonating branch 2 has a protrusion 5 in the central part for securing the test item. The resonator works as follows.

The vibration effect generated by the vibration table, excites resonant bending vibrations of the branch 1 of the beam. The inertia force of the oscillating branch 1 creates an alternating moment with respect to axis 4. When the ends of the beam are rotated relative to the supports, periodic compressive-growth forces are applied to the ends of the nonresonant branch 2. Under the action of a periodic force, branch 2, due to dynamic instability, transversely oscillates. When driving resonating

branch 1 downward from the equilibrium position to branch 2 is applied a compressive force, under the action of which a small initial deflection of branch 2 on its own weight and the weight of the product used increases. When the resonant branch 1 moves up from the lowest position to the equilibrium position, the deflection of branch 2 decreases to zero, thus the formation of the impulse ends. Upon further movement of the resonant branch 1 up and then down, from the lowest position to the equilibrium position, branch 2 is affected by the tensile force, while its deflection remains zero,

Thus, during one half-period of oscillation of the resonating branch 1, the test article is exposed to a pulse, and there will be a pause during the second half-period.

Equipping the vibrostand with the described resonator makes it possible to test products for the effect of a sequence of signed impulses with pauses between them.

Claims (1)

Claims of resonator for vibrostand, used to create a sequence of signed impulses, made in the form of a beam with hingedly supported ends, including a resonant branch arranged in an oscillation plane and rigidly connected to each other and serving to anchor the test product to a nonresonant branch having a smaller than a resonating branch, rigidity, characterized in that, in order to create a sequence of signed impulses with a pause between them, the nonresonant branch is It is not straight, and both supports of the ends of the beam are hingedly fixed.