SU1820337A1 - Method of calibrating vibromeasuring section - Google Patents

Description

UNION OF SOVIET

SOCIALIST

REPUBLIC

„.> Su _ni , 1820337A1 (51) 3 G 01 P 21/00 _____________________

STATE PATENT

DEPARTMENT OF THE USSR (GOSPATENT USSR)

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(21) 4914495/10 (22) 02.27.91 (46) 06/07/93. Bull. No. 21 (71) Research and Production Branch Dolphin Diagnostics of the Joint Venture Dolphin Diagnostics (72) O. B. Skvortsov, S. A. Korolev (56) USSR Author's Certificate No. 1086388, cl. 6 01 P 15 / 08.1982.

USSR copyright certificate No. 657356, cl. G 01 P 21 / 00,1976.

(54) METHOD FOR CALIBRATING A VIBRATION MEASUREMENT (57) Use: in the development of linear vibration measuring instruments. The inventive method for calibrating a vibration measuring path, comprising a piezoelectric sensor as a sensitive element, which consists in exciting calibrated mechanical vibrations of the piezoelectric sensor, applying a signal from the vibration sensor to a matching amplifier, detecting and measuring the level of the electric signal by generating an estimate of the level that

The proposed method relates to means for conducting vibration tests and can be used in the development of linear vibration measuring devices.

The aim of the invention is to increase the accuracy of calibration and reduce errors and reduce errors when using a vibration measuring path.

Figure 1-3 shows examples of specific implementations of the proposed method. Figure 1 shows a device for measuring sensitivity coefficients.

paradise is fed to the calculator, the piezoelectric transducer is three-component with sensitivity axes not lying on the same plane, the additional output signals of the piezoelectric transducer are fed to the corresponding additional matching amplifiers, the signal level is measured at the output of these amplifiers, and the estimates obtained are fed to the calculator by repeating the measurement three times during of each measurement excite oscillations sequentially in water from three mutually orthogonal directions and evaluate the matrix of sensitivity coefficients of the three-component of a sensor, the matrix of coefficients inverse to the sensitivity coefficients of the three-component sensor is calculated, and then the output signal of the vibration measuring path is formed as the sum of the signals from the outputs of matching amplifiers with weights equal to the elements of the corresponding row of the matrix, inverse sensitivity coefficients of the three-component piezoelectric sensor. 3 ill.

1820337 A1

The three-component piezoelectric transducer 1 is sequentially mounted on the vibrating stand 2 on the orthogonal planes 1-1-1-3, which makes it possible to obtain transverse sensitivity signals of the piezoelectric transducer 1 during vibration along the X axis.

The signals from the piezosensor 1 are amplified by matching amplifiers 3-5 and through the switch 6 are fed to the signal level meter. The output signal of the meter 7 is fed to the input of the calculator 8, in which sensitivity coefficients _ UI I = 1,2,3 ^J Aj 'J = 1,2,3 are accumulated, where Ul is the output signal of the vibration level meter when its input is connected to the output 1- of the matching amplifier, a AJ determines the test acceleration on the piezoelectric transducer when it is installed in the J-th vibrostand.

After sequential input and determination of the sensitivity matrix for the sensor, the calculator generates a matrix of coefficients, the inverse of the matrix of sensitivity coefficients, which are displayed on the display device 9.

In the future, these coefficients are used to set the transmission coefficients of the signals in the measuring path, which is shown in figure 2.

In this case, the piezosensor 1 is connected through 20 matching amplifiers 3-5 with the inputs of the correction nodes 10-12, from the outputs of which, through the meters 13-15, the signals are fed to the display device 16.

An example of the structural diagram of the correction unit 25 is shown in FIG. The output signals are fed to the inputs of amplifiers 17-19, the amplification factors of which are set via control buses 20-22 and are equal to the corresponding matrix coefficients, the inverse of the sensitivity coefficients. Thus, the vibration measuring path will have an orthonormal transmission coefficient.

As a calculator, you can use either a universal computer with automatic or manual input, or a specialized matrix handling device.

Claims (1)

SUMMARY OF THE INVENTION A method for calibrating a vibration measuring path 5 containing a piezoelectric sensor as a sensing element, which consists in exciting calibrated mechanical vibrations of a piezoelectric sensor, applying a signal from a vibration sensor to a matching amplifier, testing and measuring the level of an electrical signal by generating an estimate of the level that is supplied to the calculator, ohm ich a y with th that. in order to improve calibration accuracy and reduce errors when using a vibration measuring path, the piezoelectric transducer is performed in three-way with sensitivity axes not lying in one plane, the additional output signals of the piezoelectric transducer are fed to the corresponding additional matching amplifiers, the uroben signals are measured at the output of these amplifiers, and fed to the calculator, repeating measurement three times, during each measurement, vibrations are excited sequentially in one of three mutually orthogonal directions and the matrix of sensitivity coefficients of a three-component sensor is estimated, a matrix of coefficients inverse to the sensitivity coefficients of a three-component sensor is calculated using a calculator, and then the output signal of the vibration measuring path is formed as the sum of signals from the outputs of matching amplifiers with weights equal to the elements of the corresponding row of the matrix inverse to the sensitivity coefficients of a three-component piezoelectric sensor . <RP2 Bj Compiled by O. Skvortsova Editor S. Kulakova Tehred M. Morgenthal Corrector 0. Kravtsova Order 2028 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod. Gagarina St., 101