SU1323964A1 - Rig for graducating angular accelerometers - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to improve the accuracy and productivity of a bench. Anchor 5 of the exciter oscillations causes continuous damping oscillations of platform 1. Corresponding to the amplitude and frequency of oscillations, the angular acceleration causes the appearance at the outputs of the exemplary 2 and graduated 3 accelerometers of electrical signals fed to the system 4 of information retrieval and processing. The natural frequency of the oscillatory system is controlled by varying the rigidity of the torsion 6 by moving the clamp 7 with the lock 8 to the driving 11. The cross-coupling 10, consisting of two coupling halves and an intermediate disk, eliminates the influence of parasitic forces on the torsion in the radial direction. The axial parasitic forces on the torsion bar 6 are eliminated by the diaphragm 9. 2 Il. ea ayustero sef / e / ffff cf / jo VAZZUH 6 afTTfvt, // with 1C with; about o 4ik

Description

The invention relates to a measurement technique and can be used for the calibration of instruments for measuring angular accelerations.

The purpose of the invention is to improve the accuracy and performance of the calibration of angular accelerometers.

FIG. 1 shows the structural scheme of the proposed stand; in fig. 2 is a diagram of the cross-rocker coupling.

The device consists of a platform 1 with model 2 installed on it and graduated 3 accelerometers, a system for 4 removal and processing of information, a core 5 of a vibration exciter rigidly connected with a torsion bar 6, a clamp 7, locks 8, a diaphragm 9, a cross-link link coupling 10 , guides 11 and drive engine 12 connected to the lead screw 13. Anchor 5, an exciter of vibrations, rigidly connected with it torsion 6 and platform 1 with accelerometers 2 and 3 form a mechanical oscillatory system with a certain natural frequency of vibrations.

The cross-wing coupling consists of a no-coupling coupled with the collet 14, an intermediate disc 15 with mutually perpendicular protrusions on the front parts, half coupling 16, rigidly fastened with the central part 17 of the diaphragm 9. The torsion lock contains a clamping bracket 18 and pushers nineteen.

The stand works as follows.

Measles 5 of the exciter oscillations are affected by a harmonic control signal of the same frequency as the natural frequency of the oscillating system, which causes sustained harmonic oscillations of platform 1. Angular acceleration corresponding to a given amplitude and frequency of oscillations causes appearance at the outputs of the exemplary 2 and graduated 3 accelerometers electrical signals of harmonic form, the amplitude of which is proportional to the amplitude of the angular acceleration. The calibration is carried out by comparing the signals taken simultaneously from the outputs of the calibrated 3 and the exemplary 2 accelerometers to the 4 system for the removal and processing of information.

The oscillation amplitude of the platform is controlled by the magnitude of the output voltage.

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master oscillator supplied to measles 5 exciter oscillations. The natural frequency of the oscillatory system is changed by changing the stiffness of the elastic element torsion 6. Because of the change in the stiffness of the torsion, the length of its working part increases or decreases by moving clamp 7 from the lock 8 or 8 along the guide 11. The movement is using the engine 12 through the spindle screw 13.

To eliminate the influence of parasitic forces on the torsion in the radial direction, the cross-wing coupling 10 serves, combined with clamp 7, which maintains the position of the torsion without distortions due to the degrees of freedom of the coupling in the horizontal plane.

The length of the working part of the torsion is fixed with the help of shchematical locks 8, which fasten clamp 7 through pushers with both AND guides and with torsion 6. To fix the torsion 6 serves clamping bracket 18 and half coupling with collet 14. Axial parasitic forces on the torsion bar Aperture 9.

Claims (1)

Invention Formula A stand for calibration of angular accelerometers, containing a base with guides, oscillates; 1 system consisting of a platform and a torsion; an electromagnetic oscillator, a clamp, and an information retrieval and processing system with an input for a calibrated accelerometer, characterized in that, in order to increase accuracy and performance, an exemplary angular accelerometer, diaphragm, cross-rocker coupling consisting of two coupling halves and an intermediate disc, collet and locks, including a clamping bracket and pushers, are inserted into it, The exemplary accelerometer is installed on the platform, the information removal and processing system is already connected to the output of the reference accelerometer, the collet is combined with one of the coupling halves and covers the torsion, the other half of the coupling is fixed on the central part of the diaphragm. - The meter is clamped, and the pushers are connected to the clamp and pressure clamp. Air /. botm. FIG. 2