SU868369A1 - Moving object vibration measuring device - Google Patents

Description

(54) DEVICE FOR MEASURING VIBRATIONS OF MOVING OBJECTS The invention relates to vibration measuring technique and can be used for measuring vibration of moving objects, for example, linearly moving solid bodies, rotating shafts, flexible disks. Naibo; Its close technical essence is the device for measuring vibrations of moving objects, containing four vibrods, connected with the object under study and installed in pairs at points selected along the direction of motion of the object under study, three units of subtraction and connected in series with the third of there is a multiplier, a fourth subtractor, and a recorder. The disadvantage of this device is relatively low accuracy of measurement due to the negative irregularity of the speed of the measured object on the measurement result. 1 The purpose of the invention is to improve the accuracy in measuring the vibrations of moving objects along a constant path and flexible disks. This goal is achieved by the fact that a device for measuring vibrations of moving objects along a constant path is equipped with first additional subtraction units and an integrator connected in series with the second vibration sensor and the input of the first main deduction unit connected to the input of the third subtraction unit, the output of the first vibration sensor is connected to the second the inputs of the main and additional first subtraction units, the second additional subtractors and the integrator, which are included after the intersection vibrating sensor and input of the second main subtraction unit connected to another input of the third or fourth subtraction unit, and the output of the third vibration sensor connected to the second inputs of the base and additional second subtraction units, a device for measuring vibrations of floppy cis :, additional transmitter installed on The axes of the flexible magnetic disk and connected to the first input of the third subtraction unit, the second input of which is connected to the output of the first main subtraction unit, and the output of the second main a subtractor unit is connected to the third auxiliary input of the fourth subtracting unit. Pa figs. 1 shows a block diagram of a device for measuring vibrations of moving objects along a constant trajectory; in fig. 2 - location of the pibrotransducers above the surface of a belt moving object; in fig. 3 - the location of the vibration transducers above the creepiness of the floppy disk; in fig. four . block diagram of a device for measuring vibrations of a flexible disk. A device for measuring vibration of moving objects along a constant path, such as a tape or a rotating shaft, contains four vibration sensors 1-4, associated with the object under study 5 and installed in pairs at points selected along the direction of movement of the object under study 5, three blocks 6–8 subtraction and connected in series with the third (8) multiplier O, fourths; subtraction unit Yu, recorder 11, the first additional subtraction unit 12 and integrator 13 connected in series between the second transmitter 2 and the input of the first main subtractor 6 connected to the input of the third subtractor 8, the output of the first Broker 1 connected to the second inputs the main and additional first blocks 6 and 12 of the subtraction, the second additional block 14 of the subtraction and the integrator 15 connected in series between the fourth vibration sensor 4 and the INPUT of the second main 7 subtraction

1, connected to another input of the third or fourth blocks 8 and 10 of the subtraction, and the output of the third vibration sensor 3 is connected to the second inputs of the main and additional second blocks 7 and 14 of the subtraction.

ycTpoiicTBO for measuring vibration of moving objects, such as floppy disks, contains an additional vibration sensor 16 mounted along the axis of an object, such as a flexible disk 5, and connected to the first input of the third subtraction unit 8, the second input of which is connected

In order to eliminate the influence of the waviness of the measured signal surface of the vibration sensors 1-4, blocks 12 and 14 are subtracted, respectively. The resulting difference signals are integrated by integrators 13 and 15 and subtracted by blocks 6 and 7 from the signals of vibration sensors 1 and 3.

To obtain the vibration signal S, the signal of the vibration sensor 16 is subtracted in block 8 from the output signal of block 6. The resulting difference signal is multiplied by multiplier 9 by an amount equal to from. the distance from the vibro output of the first main gating unit G, and the output of the second main subtracting unit 7 is connected to the third, auxiliary input of the fourth subtracting unit 10. A device for measuring the vibration of moving objects along a constant path works as follows. From the exits. vibration sensors 1-4 (fVIg.l) receive electrical signals proportional to the vibration displacements (Figures 2 and 3), the oscillation H and the waviness of the measured surface. The effect of the error due to the presence on the waviness of the measured surface y is eliminated by subtracting the signals of the vibration sensors 1-4 by means of blocks 12 and 14 of subtracting and integrating the received difference signals by the integrators 13 and 15. The blocks 6 and 7 subtract the signals of the integrators 13 from the signals of the vibration sensors 1 and 3 respectively and 15. To eliminate the error from the presence of skew oscillations, the output signals of blocks 6 and 7 are rotated by block 8 and, after multiplying by multiplier 9, by an amount equal to the ratio of the distance 2d from the axis 00 of the volume skew To 5 to the vibration sensor 1 to the distance dS between the vibration sensors 1 and 3, are subtracted by the block 10 from the output signal of the subtraction block 6. The resulting measurement of displacement is recorded by the recorder 11. A device for measuring the vibration of floppy disks works as follows. During the rotation of the flexible disk 5, skewed oscillations of C arise, axial axes. Ho baths and S disk vibration (Fig. 4). In addition, oscillations arise due to the waviness of the measured surface. Vibration sensors 1-4 convert these total oscillations into electrical signals. The vibration sensor 16 measures axial oscillations of X Q.

sensor 16 to vibration sensors 3 and 4 to paccTOflHviro two from vibration sensor 16 to vibration sensors 1 and 2, and block 10 is subtracted from the output signal of subtraction unit 7. The same signal of vibration sensor 16 is also subtracted. Received. The signal of the measured vibradium is recorded by the recorder 11.

The proposed device allows to increase the accuracy in measuring the vibration of moving objects and flexible disks, since the influence of the skewed axial fi vibration vibrations is eliminated.

Claims (2)

1. A device for measuring vibration. of moving objects, containing four vibration sensors, associated with the object under study and installed in pairs at points selected along the direction of motion of the object under investigation. Three subtraction units and a series multiplier connected in series with the third one, the fourth subtraction unit and the recorder, characterized in that In order to increase the accuracy of vibration measurement, it is equipped with the first additional subtraction unit and integrator, connected in series between the second vibration sensor and the input of the first main reading unit, connected to the input of the third reading unit, the output of the first vibration sensor, connected to the second inputs of the primary and secondary first units, read by an additional subtraction unit and an integrator connected in series between the fourth the vibration sensor and the input of the second main subtraction unit connected to another input of TpeTbejO or the fourth subtraction unit, and the output of the third vibration sensor is connected to the second ring the inputs of the main and additional second subtraction blocks. 2. The device according to claim 1, characterized in that in order to improve the measurement accuracy of the vibrations of the floppy disks, it is provided with an additional vibration (: a sensor mounted along the axis of the flexible disk and connected to the first input of the third subtraction unit, the second input of which is connected to the output of the first the main subtraction unit, and the output of the second main subtraction unit is connected to the third auxiliary input of the fourth subtraction unit. Sources of information taken into account in the examination 1. USSR author's certificate in application number 2545518, cl. G 01 H 11/00 1977 (prototype).