SU1138749A1 - Angular acceleration meter - Google Patents

Abstract

ANGULAR ACCELEROMETER containing inertial mass mounted on rolling bearings, primary displacement transducer secondary transducer, characterized in that, in order to improve measurement accuracy, the bearings are located along the central axis of a multi-pole symmetric magnetic system, and the rolling elements of the arcs are made of magnetic material. 5-nK J & 0 30 .t Yy VSM.I g 12

Description

The invention relates to a measurement technique and can be used to measure the angular acceleration of moving objects. The angular accelerometer with power balancing and electric damping is known, the suspension of which inertial mass is made on a torsion assembled from flat elastic plates 1. The disadvantage of this accelerometer design is the presence of temperature error caused by a change in the mechanical properties of the elastic suspension. The closest to the invention to the technical essence is a vibration sensor of a rotating shaft containing inertial mass, mounted on rolling bearings, primary displacement transducer, secondary converter f2. The action of a known sensor is based on the property of an inertial mass connected by soft springs with a rotating shaft, not perceive; changes in shaft rotation speed. The inertial mass is a flywheel mounted on a shaft using rolling bearings. The relative displacement of the flywheel and the shaft is perceived by the primary transducer. In this accelerometer, the measurement accuracy is low due to the small depth of balancing due to the large value of the natural frequency of the suspension due to the presence of elasticity. Communication The purpose of the invention is to improve the measurement accuracy by the inclusion of elastic communication. The goal is achieved by the fact that in the angular accelerometer containing inertial mass mounted on rolling bearings, the primary displacement transducer, the secondary transducer is located under the hips along the central axis of a multi-pole symmetric magnetic system, with the rolling elements of the bearings made of magnetic material. The accuracy of an instrument with power equations by broadcasting depends on the depth of equilibration, which is determined by the ratio of the electrical rigidity of the instrument to the mechanical or by the ratio of the squares of the own circular 492 frequencies of the entire instrument and suspension. The depth of balancing is desirable to increase in every way. For instruments with the same measurement ranges of the magnitude of the current acceleration and frequency ranges of measurements, the depth increases with decreasing. eigenfrequency of the suspension. On, figure 1 shows the device of the proposed accelerometer; in FIG. 2, the same structural diagram. The angular accelerometer consists of an inertial mass that includes disk 1 and axis 2. B disk 1 Three three-section windings 3-5 are mounted, with three central electrodes 6 of the external displacement transducer mounted on it. Axis 2 is connected to the screws 7 and 8 by means of radial ball bearings 9. On the screws 7 and 8, permanent magnets 10 are placed on six on each key. The lid 7 also has three pairs of tank electrodes 11 of a capacitive displacement transducer and an electronic unit 12 of the secondary conversion. The covers 7 and 8 are fixed on the housing 13. The magnets 10 are located on the covers 7 and 8 at equal intervals around the circumference and form six working clearances, the bearings 9 are installed, in the center of the screws 7 and 8. When the bearings 9 are installed, their balls are magnetized and vertical and radial directions, as a result, in the bearings 9, backlashes are selected. The balls of the bearings 9 occupy the position shown in Fig. 1 relative to the magnets 10, section B-B, as a result of which, in connection with axis 2 and 7 and 8, a magnetic spring effect occurs and the disk 1 occupies a well-defined position. The accelerometer works as follows. With the neutral position of the central movable electrodes 6 located on the inertial mass, the bones of the displacement transducer are balanced and the output signal from the accelerometer is zero. When exposed to angular acceleration, the disk 1 with the electrodes 6 is displaced, resulting in a misalignment of the capacities of the displacement transducer. The signal unbalance through the amplifier 14 and the filter 15, is located

in the electronic unit 12, is output and simultaneously to the winding 5 for power balancing. When the angular acceleration changes in the winding 3, an electromotive force (EMF) is induced, is proportional to the velocity, displacement of the inertial mass.

The voltage of the EMF through the amplifier 16 is applied to the winding 4, which is damping. .

Magnetic suspension on ball bearings works in the following way.

In the neutral state, the bearing balls 9 are in areas of small magnetization (section BB, Fig. 1).

When subjected to angular acceleration, the inertial mass is displaced, while the balls without slipping

rolled along the inner and outer rings of the bearings. At the end of the angular acceleration, the balls return to the neutral position under the action of a magnetic field, while the inertial mass is also returned to the neutral position. Experimental verification of the accelerometer magnet system of which is performed on cobalt-samarium magnets 10 of size 5x3x7, with an inertial mass of 2 g and suspension with bearings of type 1000901, obtained a natural frequency of angular oscillations of inertial mass up to 12 Hz.

The proposed magnetic rod with an increase in the strength of the suspension made it possible to reduce its own frequency and thereby increase the measurement accuracy.

Claims (1)

_d ANGULAR ACCELEROMETER containing an inertial mass mounted on rolling bearings, a primary displacement transducer is a secondary transducer, characterized in that, in order to increase the measurement accuracy, the bearings are placed along the central axis of a multi-pole symmetrical magnetic system, and the subtype rolling elements are made of magnetic material. Figure 1 1 '138749 2 The invention relates to measurements — the frequencies of the entire device and suspension. This technique can be used to measure the angular accelerations of moving objects.