SU1698663A1 - Device for exciting of two-component oscillations in one-component vibration exciter - Google Patents

Abstract

The invention relates to a vibration technique, namely to devices for setting a two-component vibration on a single-component vibration exciter. The purpose of the invention is to expand the operational capabilities by expanding the frequency range. Device 4 Fig. 1 The device includes a housing 5, which is attached to the table of a vibrostand, a platform 7 for installing a test article, made in the form of a resonating beam with an adjustable frequency,% a mechanism for converting one component vibrations of the vibrator table into two component vibrations of the platform 7, which is made in the form of two plates 2, hingedly connected with the case 5 and parallel to the axis of action of the vibration exciter, and two console beams-resonators 1, rigidly connected with the opposite ends of the plates 2. The hinged joint The design of the platform 7 with the middle plates 2 and the possibility of independent adjustment of the natural frequencies of the platform 7 and the resonators 1 (with the help of adjusting mobile loads 9) allows extending the operating frequency range of the device. 1 hp ff, 2 ill. (Ls

Description

The invention relates to a vibration technique, namely to devices for reproducing two-component oscillations using a single-component vibration exciter.

The purpose of the invention is to expand the operational capabilities by expanding the frequency range.

The goal is achieved by the fact that the device is equipped with a housing designed to fix the vibration exciter on the table, and the oscillation conversion mechanism is made in the form of two plates hingedly connected by the ends of the housing and parallel to the axis of action of the vibration exciter, and two resonators in the form of console beams with installation-movement - with cargoes placed outside the body perpendicular to the plates and rigidly connected to the opposite ends of the plates, and the platform is hinged to the middle of the spans astin. The platform is made in the form of a resonating beam with adjustable natural frequency.

Figure 1 shows the proposed device for driving two-component oscillations on a single-component vibration exciter, front view; figure 2 is the same, the left view.

The device comprises an oscillation conversion mechanism having two resonators 1 in the form of cantilever beams rigidly connected with opposite ends of two plates 2 hinged by means of axes 3 in racks 4 of housing 5 and positioned parallel to the axis of action of the exciter. The resonators 1 are placed outside the housing 5 perpendicular to the plates 2, which are pivotally connected in the middle of the span through axis 6 to platform 7 installed with a vibration exciter (not shown) along the axis of action of the latter and relative to movement in the perpendicular direction and serving fixing the test product (not shown) on the protrusion 8, Each resonator 1 is equipped with a movable load 9, fixed by a screw 10 In the racks, slots 11 are made to increase the amplitude of oscillations PL Steen 2 and the housing 5 are provided openings 12 intended for fastening it on the table exciters. Pins 13

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serve to mount the resonators 1 to the plates 2.

The device works as follows.

After the vibration exciter is mounted on the table, the device is adjusted, for which weights 9 are placed close to the uprights 4 of the housing 5 and secured with screws 10, and a jack is placed on the ledge 8 of the platform 7, the weight of which is equal to the weight of the attachment with the product under test. The excitation frequency is set equal to the natural frequency of the platform 7, and the accelerator amplitude of the vibration exciter table is set. In this case, platform 7 makes oscillations in a vertical plane. Then weights 9 are moved along resonators 1, in the process of which the bending moment created by them acting on the plates 2 increases. As a result, the deformation | of the plates 2 increases and their resonant frequency decreases. In this case, the platform 7 is moved in the horizontal plane. When a given amplitude of oscillation is reached, weights 9 are fixed with screws 10. The maximum amplitude of oscillations of plates 2 is obtained by setting the resonant frequencies of resonators 1 to the set excitation frequency. To do this, one of the weights 9 is initially moved and fixed when the plates 2 reach the highest oscillation amplitude. Then move the second load 9, while the amplitude of oscillation will increase. When the maximum amplitude value is reached, the second load 9 is fixed. After setting up the device, the load on the fixture with the product under test is changed, the fixture is fixed on the ledge 8 of the platform 7 and the vibration exciter is turned on, the test program is:

To test products at various frequencies, platform 7 is made with an adjustable frequency. When applying a biharmonic effect on the device and adjusting the natural frequencies of the resonators 1 and platform 7 to the matching excitation frequencies, the test product will oscillate in vertical and horizontal directions also with different frequencies.

Compiled by M. Dianova Editor A. Makovska Tehred A. Kravchuk

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Proofreader N. Revska

Claims (1)

Claim 1. A device for exciting two-component vibrations on a single-component exciter, containing a platform for installing the test product, mounted with the possibility of joint movement with the table of the exciter along the axis of action of the last and relative movement in the perpendicular direction, the mechanism for converting table vibrations is excitable. For platform vibrations perpendicular to it, characterized in that · in order to expand the operational capabilities due to the expansion of the frequency range, it is equipped with a housing designed to fix the vibration exciter on the table, and the transformation mechanism, 0 vibrations is made in the form of two plates pivotally connected by ends to the body and parallel to the axis of action of the vibration exciter, and two resonators in the form of cantilever 15 beams with installation and movable loads placed outside the case perpendicular to the plates and rigidly connected to the opposite ends of the plates, and the platform is articulated to 20 yen with the middle of the spans of the plates, 2. The device according to claim 1, wherein the platform is made in the form of a resonating beam with adjustable natural frequency.