SU1348737A1 - Device for graduating accelerometers - Google Patents

Abstract

The invention can be used to determine the sensitivity coefficient of accelerometers in shock mode. The purpose of the invention is to simplify operation. When a driver 2 strikes a rod 2, a shock wave is compressed in the latter, causing a rebound of the rod 3, which, having passed the measured base, interacts with obstacle 6. When the rod 2 of the rod 3 departs from the rod 3, the accelerometer 5 produces a signal that is applied to the speed meter 13 and a pulse area meter 14. The sensitivity coefficient of the accelerometer is determined by the above formula. 2 Il. with "(L (; about 4 00 with VJ

Description

one

The invention relates to a measurement technique and can be used to determine the sensitivity coefficient of accelerometers in shock mode.

The aim of the invention is to simplify operation.

Figure 1 shows the structural diagram of the proposed device; figure 2 - the device section.

The device contains a shock driver 1, a composite mechanical waveguide mounted vertically and includes a main rod 2 and an additional rod 3 acoustically associated with it. At the free end of the additional stitch 3 there is a projection 4 and the accelerometer 5 being attached is fixed niyi measuring base 1 from the protrusion of the striker 4 is fixed to the barrier 6.

In addition, the main rod 2 of the mechanical waveguide is made with a longitudinal hole 7 at its end (FIG. 2), and the additional rod 3 has a cavity 8 in which a second hammer head 10 spring-loaded 9 is aligned with the first 4 spring-loaded 9.

The second hammer 10 has a shank 1 coaxially placed in the longitudinal hole 7 of the main rod 2 and orienting the additional rod 3 in the initial position at its end.

The registration unit 12 in the device design includes an additional rod departure speed meter 13, a pulse area meter 14 and a resolver 15, while the output of the embeddable accelerometer 5 is connected to the input of the departure speed meter of the additional rod 13 and the square meter 14 pulse, and the output of the meter 13 of the speed of departure of the additional rod and the output of the meter 14 of the pulse area - with the inputs of the resolver 15.

The device works as follows.

When striking with shock exciter 1 on the main rod 2, in the rod 2, a shock wave is compressed, which propagates along it and causes the additional 3 to rebound. Additional 13487372

rod 3 as a result of the acquisition

melts the speed of departure V and passes the dimensional base Ij, at the end of which the jib 4 interacts with the fixed obstacle 6. As a result, the second impact is reproduced, while the additional rod 3 stops due to movement in the cavity 8 and interacting with the additional rod 3 of the second striker 10 Next, the additional rod 3 falls freely and, due to the shank 11 moving in the longitudinal hole 7 of the main rod 2, is installed in the initial position on the end of the main rod 2.

When the additional rod 3 leaves the end of the main rod 2, the accelerometer 5 generates a signal that is applied to the speed meter 13 and the pulse area meter 14.

The speed of departure of the additional rod at the time of separation

ogl j a (t) dt.

where a (t) is the shock acceleration;

 - duration. The area under the signal from the accelerometer

in S j a (t) dt.

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where dt is the signal from the accelerometer.

Accelerometer sensitivity coefficient is defined as

40

k - iiitl ° d (t)

In this way

45

ka S / V ,,

but, since the speed of the UDTA will be equal to V ,, the base; WITH

 C / Grr, where Ig- is the measured time of flight, then

etc

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S T- -

one

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The time of flight is determined by the time interval from the signal produced by the accelerometer 5 when the additional rod 3 bounces and from the signal produced by the accelerometer 5 when interacting with a fixed obstacle 6-13487

The device implements the value of S c pp. Since Ig is fixed and known, it also determines the desired value of kg. The definition of kg can be implemented in a computer.

Claims (1)

Invention Formula A device for calibrating accelerometers containing a shock driver, a mechanical waveguide including a main rod and an additional rod acoustically connected with it, on the free end of which there is a projection block and a node 0 five 17 fixing a calibrated accelerometer, as well as a mechanical damper and a recording unit, characterized in that, in order to simplify operation, a longitudinal hole is made at the end of the main rod of the mechanical waveguide, a fixed obstacle is fixed at a given distance from the protrusion - there is no cavity in which is placed with the possibility of reciprocating movement coaxially to the first spring-loaded second firing pin with a shank, which is coaxially placed in the longitudinal hole of the shaft ovnogo bar To registration block Editor Y. Sereda Compiled by T. Makarova Tehred M. Khodanych Order 5184/44 Circulation 775 Subscription VNIIPI USSR State Committee Software Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Phage. 2 Proofreader L. Pilipenko