SU728017A1 - Stand for testing antivibration cables for vibration-proofness - Google Patents

Description

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The invention relates to the field of vibration testing of products, namely, vibration test stands for anti-vibration cables, and can be used in instrument engineering and radio frequency targets to control the quality of anti-vibration cables of coaxial type with voltage) 1p.

Devices for testing anti-vibration cables are known, comprising two parallel plates, a cylinder between them, which is fixed at one end of the cable, a power amplifier connected to the other end of the cable, a mechanical vibration exciter associated with plate insulation, and connected to the amplifier recording device 1.

Using such a device, it is possible to measure noise voltages during cyclical cable twisting, however, this device is unsuitable for determining its vibration resistance.

The closest to the invention to the technical essence is a device for testing aerial anti-vibration cables for internal resistance, containing a base, a mechanical vibration exciter, a device for fastening the subject with it. the cable connected to one of the ends of the cable is an electrometric amplifier and registering device 2 connected to the amplifier. In this stand, the second end of the cable is left open, and the device for fixing the cable to be used is a clip.

When tested at this stand, the cable is exposed not only to vibration accelerations, but also to bending deformations. For some brands of cable, the voltage noise due to bending can be significant. For this reason, the measured total noise voltage does not accurately determine the vibration resistance of the cable.

The aim of the invention is to improve the accuracy of testing, by eliminating bending deformation.

For this, the device for fastening the exhausted cable is made in the form of a rocker CONSOLE with a groove for rigid fastening in

The cable is connected to the driver of mechanical oscillations, and the second is connected to the base by means of backlash-free hinges, and the connection of the electrometric amplifier to the end of the cable is made by charging the pre-electrode electrode, which can be rotated relative to this axis.

In this stand, the charge of the retractor tszgoG electrode can be installed at the second end of the console, insulated from it and shielded from electrostatic interference. ; The drawing schematically shows the described stand.

The stand contains a base 1, a mechanical oscillation exciter 2, a device for fixing the test cable 3, made in the form of a swing arm 4 with a groove 5 for rigidity of fastening the cable 3 in it, the charge de-energizing, the discharge electrode 6, the electrometric amplifier 7 and the recording device 8 The first end 9 of the console 4 is connected to the exciter 2 mechanical oscillations, and the second end 10 is connected to the base I by means of backlash-free hinges 11 to the base I. The charging electrode 6 is mounted along the swing axis of the console with the possibility of rotation axis. Electric 6 is installed at the end 10 of the console 4, is isolated from it and is covered with an electrostatic screen 12.

The stand works as follows.

Before the test, the cable 3 is rigidly fixed in the groove 5 of the console 4 and its end is connected to the electrode 6, which is connected to the electrometric amplifier 7. The influence of the exciter 2 mechanical oscillations on the end 9 of the console 4 creates a swinging movement of the latter. Due to this, the cable 3 fixed in the groove 5 of the console 4 is subjected to vibration acceleration and is not subjected to bending deformation.

The recording device 8 measures the amplitude of the noise voltage in the cable. The noise coefficient Kc, characterizing the vibration resistance of the cable, is calculated by the formula:

- voltage noise in the cable;

- vibration acceleration;

but

I, is the length of the cable.

The improvement in test accuracy achieved with the use of the invention makes it possible to test anti-vibration cables with a low level of vibration from vibration. accelerations;

Claims (2)

1. Stand For testing anti-vibration cables for vibration resistance, containing a base, a mechanical vibration exciter, an associated device for fastening the test cable, connected to one Of the cable ends, an electrometric amplifier and a recording device connected to the amplifier, characterized in that accuracy of cable testing by eliminating bending deformation, the device for fastening the cable under test is made in the form of a swing arm with a groove for rigidly fastening the cable in it, vy end of which is associated with mechanical oscillations exciter, play-free and the second hinge means connected to the base, and an electrometric amplifier connecting to an end of the cable effected by charging dootvod electrode, installed on the axis of swinging console rotatably relative to this axis. 2. The stand according to claim 1; the difference is that the Charging electrode is installed at the second end of the console, shielded from it by electrostatic interference. Sources of information taken into account in the examination 1- Ilyukovich A.M. Tekhtshka of electrometry. ., Energie, 1976, p. 52. 2. In the same place (prototype).