SU949505A1 - Pendulum accelerometer harmful moment determination method - Google Patents

Description

The invention relates to instrumentation and can be used to create precision accelerometers.

A known method for determining the harmful moment of the accelerometer, in which the input axis of the accelerometer is rotated in a vertical plane around the horizontal axis, measure the output signal of the accelerometer at various positions of the input axis, which is used to judge the magnitude of the harmful moment [1].

The disadvantage of this method is the lack of accuracy due to the inability to isolate harmful moments from magnetic traction. There is also a method of determining the harmful moment of the accelerometer by measuring the output signals at a constant value of the effective acceleration [2].

The disadvantages of the method are the limited scope and lack of accuracy due to the inability to isolate the components, the harmful moment, for example, a component from magnetic tension.

The purpose of the invention is the allocation of the component of the moment from magnetic tension.

This goal is achieved in that according to the method for determining the harmful moment of a pendulum accelerometer by measuring the output signals at a constant acceleration value, the output signals of the accelerometer are measured at two different magnetic fields by installing magnets in the magnetic system of its moment sensor, and the magnitude of the magnetic moment of tension is determined by formula and _m- k. _{t <} ^{b 1 and} _b '<11 where M. is the moment of magnetic tension;

B ⁼ , "mN

K is the slope of the accelerometer torque sensor during the first and second measurements of the output current;

I - values of output signals ^{6 x} (currents) at the first and second measurements.

The essence of the proposed method lies in the fact that a controlled sensitive element is installed in the device’s body and the output signal is measured, for example, the output current under the action of acceleration of a certain value and the value of the magnetic field strength created by the standard (working) magnet of the torque sensor.

Then, at a constant value of the effective acceleration, the intensity of the accelerometer’s magnetic field is changed by installing another magnet in the magnetic system of the torque sensor. Thus, the proposed method allows us to determine the component of the harmful moment from magnetic tension.

nit and measure the output signal. The magnitude of the harmful moment caused by magnetic attraction is determined by the formula (1).

Indeed, the equations of moments acting on the pendulum of the accelerometer at 1 are of the form ^{mx + M} nm + M _HW where M _i , Μ ^, 1 m, m, m m-ί os, the first and second ^M os <= ⁰ g m _os ; = o ,.

measurements, (2) ⁺ m _m ; +

Mr. - mo respectively, ί ^0Sg ment from the effects of acceleration, the time nonmagnetic harmful nature of the magnetic moments and stringing, ₅ February moments feedback connection with the first and second measurements.

Subtracting equation (3) from (2) and taking into account that ^M m = ^q 1 / «ΜΪ ^κβ ζ - _ _{ν т} 30

My. ^{By №} '№ axes ^{K 1} MGy _{BL) X} = £ = 1 s.

^To MHC ⁱⁿ 2 We obtain expression (1) for determining the magnitude of the moment due to magnetic pulling Mf ^ = M _m during the first measurement carried out with a working (standard) magnet of the torque sensor.

For a more accurate determination of the magnetic pulling moment from measurements of the output signal, it is necessary to produce 40 at the minimum level of magnetic ’field strength, the value of which is determined from the condition that the feedback loop is closed. 45

Claims (2)

acceleration of a certain magnitude and magnitude of the magnetic field strength, created by a regular (working) magnet of the torque sensor. Then, at a constant value of the acceleration, the intensity of the accelerometer's magnetic field is changed by installing another magnet of the torque sensor in the magnetic system and the output signal is measured. The magnitude of the harmful moment caused by magnetic stresses is determined by formula (1). Indeed, the equations of moment acting on the dial of the accelerometer in the first and second measurements have the form M, + Mn «+ Mn. + M. O, (2) X - - Mn + ... M + Mn., + M „L Oh. where m, mc, m | - respectively, the moment from the action of M, M, M w- {OS-, ocj acceleration, the harmful moment of non-magnetic nature, and the ms of the cent of magnetic gravity feedback moments during the first and second measurements. Subtracting equation (3) from (2) and taking into account that MMH «5, MOO, CMR. 1v ,,. / МБс „Mt., -1 КгА1и Si КМР Ва We obtain the expression (1) for determining the magnitude of the moment from the magnetic magnetism of М М during the first measurement carried out at the working (normal) magnet of the moment sensor. In order to more accurately determine the magnetic moment of the measurements of the OUTPUT signal, it is necessary to produce at a minimum level of magnetic field strength, the value of which is determined from the condition that the feedback loop is closed. Thus, the proposed method allows to determine the component of the harmful moment from the magnetic current. The method of determining the harmful moment of an accelerometer by measuring the output signals at a constant acceleration value, characterized in that, in order to separate the component from the magnetic moment, the output signals of the accelerometer are measured at two different magnetic field strengths installation of magnets in the magnetic system of its torque sensor, and the magnitude of the magnetic moment of the marriage is determined by the formula M - K PJftt fx-i byx 1 M. MB where Mdl is the moment of magnetic gravity; K ddr. K - the steepness of the accelerometer's sensor in the first and second measurements of the output current: Bbix Pptnt values of the output signals (currents) in the first and second measurements. Sources of information taken into account in the examination 1. Airborne navigation system. Sat materials. Per. from English, ed. V.Yu. Shelf. M., Military Publishing House of the USSR USSR, 1973, p. 254. 2. Authors certificate of the USSR 575574, cl. G 01 R 21/00, 05/17/76 (prototype).