SU744261A1 - Apparatus for measuring non-linear distorsion factor and dynamic band of vibration stands - Google Patents

Description

8, the outputs of which are connected to the inputs of the recording unit 3.

The device works as follows.

When measuring nonlinear distortion, the non-switching unit 8 connects the output of matching unit I to the first input of the registering unit 3, and the output of the blocking filter 2 to the second input of the recording unit 3.

From the output of the generator 5, a sinusoidal signal (reference voltage) with a frequency of, for example, 1000 Hz is applied to the initial input of the modulator 9.

The second input of the modulator 9 from the generator 7 receives a slowly varying signal, for example, according to the law of a regular triangle with a frequency of 0.05 Hz.

From the output of the modulator 9, the signal and the signal to the object of measurement (vibration bench 6), the frequency of this spgnal is equal to 1000 Hz, and the level is measured according to the law of the signal from the generator 7.

The sigial at the output of the vibrostep 6 (or the output of the drying unit 1) is of an uni form, it is undesirable for its input, which is explained by non-linear suits / keni brought in by the subject of vibroceptive (vibrosteam 6).

From the output of the vibrostep 6 sigp h, the sensor is supplied to 4 parameters of motion cTo.ia, for example, a piezoelectric accelerometer, and then to the matching unit 1. which serves to match the sensor 4 and the subsequent measuring equipment.

From the output of the matching unit 1, the signal is fed to the input of the blocking filter 2, as well as to the second input of the switching unit B, then this signal from the first output of the switching unit 8 is fed to the first input of the recording unit 3.

The output signal of the blocking filter 2 is fed to the third input of the switching unit 8 and then from the second output of the switching unit 8 to the second input of the recording unit 3.

The peculiarity of the blocking filter 2 is the possibility of obtaining the output of a sigal pa, in which the first harmonic of the irocees under study is absent.

Thus, from the output of the band-stop filter 2 to the second input of the recording unit 3, a signal is received, which is the difference of the signal from the output of the vibrosteel a 6 (or from the output according to unit 1 of the first harmonic) of the specified process {rejection signal).

Having obtained a record in the logarithmic mastaba, one can subtract the ordinates of the curve corresponding to the level of the full sigial from the output of the vibrating table 6 from the ordinates of the curve corresponding to the level of the notch signal, to obtain the nonlinear distortion coefficient directly in the samples.

In determining the dynamic diaiazo

four

It is possible to use the same final waveform that was used in determining the nonlinear distortion factor.

For this pa oscillogram with the recording of the OUT010-0 signal and the notch signal, it is necessary to record a graph of the change in the level of the input signal. Then, points with a predetermined value of the nonlinear injection coefficient are marked on the output signal level curve and transferred to the input signal level variation curve. The distance between these points determines the value of the dynamic range in decibels, and if the curve of the change in the level of the input sigial is nromatched in stipe units, then it is possible to determine the values of the horizontal and the outer limits of the dynamic zone, for example, in volts.

In this case, the scheme is determined by the curve of the level of the input pixel as follows.

The switching () lock 8 switches the input and output of the barrier filter 2 from the recording unit 3 and connects the output of the modulator 9 to any) 1 m from the inputs of the recording unit 3.

A lead from the output of the modulator 9 passes through the switching unit 8 and is recorded on the oscillogram in the recording base current 3.

Thus, a final recording of the three frames will be obtained: the input, output li of the notch signal.

The main advantage of the invention, compared with known devices, is a reduction in the time of measurement and the development of precision technology.

F o rm y l and g; 3 a b ete and

The netrod for pzmperep non-linear distortion coefficient and dynamic range of vibrodetends, contains cor; iaydryvysheratoyushchaya block, blocking the filter, registering unit, sensor of dvizhep dvizhep and hepheater, the output of which iredapazpachap to connect with the vibrostand attached to the sensor, and its sensor, and the sensor, and the sensor, and the sensor, the output of which iredazpachappep to connect to the vibrostand, on which the sensor is attached. b.; yuk with the input of the blocking filter, the output of which is connected to the 1st pass registering the chop; its block, from; 1st time, in order to shorten the time of measurement ; 1st, the opto is equipped with: 1P1 gelfym generator, M b: 1 com modulator, and a toro modulator, whose inputs are connected from the generator output, and the modulator's output and switch for connecting the vibrator to the first input of the switching unit, the second input of which its output is the output of a matching 1, its unit and with the input of the barrier filter, the output of which is connected to the third input of the switching unit, the outputs of which are connected to the inputs of the recording unit. Sources of information taken into account in the examination

1. Installation electrodynamic vibration. Methods and means of measurement. GOST 19118-73. M., 1973, p. 13-14, drawing 7 (prototype).

Claims (1)

A device for measuring the coefficient of nonlinear distortion and the dynamic range of vibrating stands, comprising a matching unit, a blocking filter, a recording unit, a table motion parameters sensor, and a generator whose output is designed to be connected to a vibrating stand, on which a table motion parameters sensor is fixed, connected via an matching block to the input a blocking filter, the output of which is connected to the input of the recording unit, characterized in that, in order to reduce measurement time and improve accuracy, it is equipped with an additional generator, a switching unit and a modulator, the inputs of which are connected to the outputs of the generators, and the output of the modulator is designed to connect to the in-line stand and connected to the first input of the switching unit, the second input of which is connected to the output of the matching unit and to the input of the blocking filter, the output of which is connected to the third input of the switching unit 744261, the outputs of which are connected to the inputs of the recording unit.