SU1610360A1 - Amplifier of vibrations for vibration-testing machine - Google Patents

Abstract

This invention relates to a vibration test technique. The purpose of the invention is to reduce the labor intensity of operation. The vibration amplifier for the vibrostand contains a set of interconnected resonators 1 with different eigenfrequencies, which allows an increase in the amplitudes of random and polyharmonic oscillations in the frequency band. The resonators 1 are made in the form of beams with movable loads 9, which makes it possible to adjust the gain frequency band without dismantling the entire oscillation booster. The resonators 1 are fixed by the middle part in the racks 3, and at one end - on the pusher 6, through which the amplified vibrations are transmitted to the plate 7, intended for the installation of the tested product. The natural frequency of plate 7 is lower than the operating frequency range, and the natural frequency of the beams between the supports is higher, otherwise plate 7 will be too rigid, and the sections of the beams between the supports will bend and the oscillations will not increase. In order to align the amplitude-frequency characteristic of the vibration amplifier, the compression of the legs 3 to the side surfaces of the resonators 1 can be adjusted, and for even greater amplification of the oscillations, part of the joints are hinged and movable. 2 hp ff, 4 ill.

Description

The invention relates to a vibration test technique, in particular to vibration amplifiers mounted on vibrating tables.

The purpose of the invention is to reduce the labor consumption due to the possibility of changing the operating frequency band without dismantling the resonators.

Figure 1 shows a oscillating amplifier ,. front view; figure 2 - the same; top view; l on fig.Z - section aa in figure 1.; on figure 4 - section bb in fig. 1:

The oscillation amplifier contains a set of resonators 1, made in the form of double-girders, the middle part of which is hinged through axis 2 in parallel racks 3 of the housing element 4, and one end of each beam is connected to the pusher 6 through pin 5, which is also rigidly connected to the center of the plate 7, hinged in racks 3 through axles 8. On: the cantilever section of each resonator 1 is mounted a movable load 9 whose position relative to the beam is fixed by a screw 10. To increase the amplitude of oscillations of the plate 7 in racks 3 v olneny slot 11, whereby the connection of the plate 7 with racks 3 in this place is shar.shrno movable. In places ah of the connection of the beams of the resonators 1c by the pusher 6 in the beams for the same purpose. Slotted 12 are made. Racks 3 are interconnected by bridges 13. In the case element 4 holes are made

I l

14 for fastening the vibration amplifier to the moving element of the shaker.

The natural frequency of the plate 7 lies in the preresonance region of the operating frequency band of the oscillatory amplifier; otherwise, the pusher 6 will not be able to sufficiently deform plate 7 because of its high stiffness. At the same time, the eigenfrequencies of the sections of the beams between the supports lie in the over-frequency range, otherwise, with vibrations, these sections will be significantly bent and will not be able to transmit oscillations from resonators 1 through pusher 6 to plate 7

The amplifier oscillations as follows.

After fixing on the shaker table, the device is adjusted, for which weights 9 are mounted close to the uprights 3 and fixed with screws

with

5 20 25 jq

35

Q

,

55

10, Set the excitation frequency of the vibrostand equal to the lowest (first) frequency of the operating range, move one of the weights 9 along the beam and fix it with the screw 10 when the plate 7 reaches the maximum oscillation amplitude. Then the second (higher) frequency of the stand excitation is set and all operations with the second resonator 1 are repeated. Using all the resonators 1 in this way, they are tuned to amplify oscillations in the entire operating frequency band. Then remove the amplitude-frequency characteristic of the amplifier oscillations. To smooth it, adjust the tightening force of the axes 2 of each resonator 1, thereby changing the preload of the sections of the uprights 3 between the ridges 13 to the side surfaces of the beams. After tuning the oscillation enhancer, the test product is installed on the plate 7 and the shaker table is switched on to implement the test program. The vibration amplifier increases the amplitudes of harmonic, polyharmonic, random vibration with the same gain in the entire operating frequency band.

The change in the operating frequency band (expansion or contraction of the band, raising or lowering the frequencies) is carried out by moving weights 9 on the beams of the resonators 1 without disassembling the entire device, without removing it from the stand. Thus, it decreases. the complexity of the operation of the device.

Claims (2)

Invention Formula 1. An oscillation booster for a vibrostand containing a set of resonators with different natural frequencies mounted on a moving element of the vibrostand, different in order to reduce the laboriousness of operation due to the possibility of changing the operating frequency band without dismantling the resonators, it is equipped with a housing element with parallel supports, and the resonators are made in the form of two-support hinged beams, connected by a middle part with the supports, and at one end - with a pusher attached the center plate, while on the portion of each cantilever beam is yuschems its resonating element is mounted the load is mobile along the beam, and the natural frequency of the sections of the beams of the supporting beam lies in the resonance frequency range of the vibration amplifier, and the plate's own frequency lies in the preresonance frequency range. 2. The amplifier according to claim 1, about tl and - due to the fact that the connection of the middle part of the beam with the pole with the rack 610360 6 We performed with adjustable pressing racks to the side surfaces of the beam. 53. Amplifier according to LPs 1 and 2, which is indicated by the fact that the connection of the end of each beam with the pusher and the connection of one of the ends of the plate with the struts are fulfilled by a ball of research and development. jrt Aa 2. Fig. 3 eight Phage.2 five I ///////////////. Jl X //////////// 77 // Phage.