SU827990A1 - Device for reproducing random vibrations - Google Patents

Description

The average value of the signal, whose inputs are connected to the outputs of the corresponding band-pass filters, and the analyzer is designed as a comb of multipliers, the second input of each of which is the key to the output of the corresponding stabilizer. In addition, to reduce the error caused by the phase shift 3 of the excitation / oscillation path, each feedback channel is equipped with an adder, connected to the input of the comparison unit, and is made with two lateral connections between the adder and the Vibrator transducer and each kz which includes series-connected multiplier, integrator and quadrator, with the input of the mind "about the kit of one of the circuits connected 1 | to the output of the stabilizer through the phase-shifting sound. FIG. 1; Image |) Idea is a block diagram of the proposed device; FIG. 2 is an implementation option for & a la feedback. The device will hold two statistically independent generators-- / wide-band noise; connected to the inputs (one-odd, the other - even) N shaping channels, each of which contains a band-pass filter 2 and a block 3 level adjustment. The outputs form: their channels under; -: The switches through the adder 4 to the exciter 5 oscillations, and the platform of which is equipped with the Bi-transducer 6. | Output of the Vibro-Converter 6 and connected to the feedback inputs of the channels, each of which contains a series of multipliers 7, integrator 8 and unit 9 comparisons, to the second input of which a level adjuster is connected (not a low level switch). The second inputs of the multipliers 7 are connected via level stabilizers 10 to the outputs of the bandpass filters .2 of the respective shaping channels. The output of the comparison unit 9 is connected to the control input of the level adjustment unit 3. The device operates as follows: generators / splits are split by -2 bandpass filters into L narrow spectral bands. The signals of the spectral bands are regulated by the level of the corresponding level adjustment blocks 3 and, through the adder 4, excite the pathogen 5 oscillations. The signal of the vibration converter 6 is set to the inputs of multipliers 7, the second inputs of which are supplied by the stabilizer signals JO, which ensure the value of the root-mean-square value of the signal. Comb multipliers 7 forms an analyzer (not shown). It is known that the nominal composition of the product of two functions of time -1and CO and gCO is 5 ° / (O g (i) dt, ff (oo) X,. XG (co) rfo3,;: е f (u) f (co ); 1S; and 1Y the spectrum of the function f (t); G (π) G {K) e is the spectrum,; м mpls5sgo-soi5; the spectrum of OVUKUHM. co), (2) r; ic F (co) and G (co) are the spectrosis modules f (co) and G ((o); (;-( oi) and f (co) are their phase characteristics. Since the signal form diJLibTpa z.zkopolos 1st, then 5 (0) F ((G (M) (o)) () V- (3) If the multiplied functions f (t) and g (t) are statically independent, then independent The characteristics f (w) and p (co), and (co) - t (m) represent a fast Oscillating function. In this case, by the Riemann lemma 5 (0) 0. This property allows us to distinguish from the sum of random signals Only "your signal and for a known value of P (s) should be estimated by the value of the constant component 5 (0) at the output of the multiplier 7, its 1-; real power. The constant component According to the first integral in the expression (1), The integrator 8 and compared with the equipment setter in block 9 comparison. The fault voltage affects the control input of level adjustment unit 3. Thus, the process of autoregulation for each sectoral band is carried out only depending on the levels of its own signal, and the biasing effect of adjacent channels is eliminated. The multiplier (co) -if) (co) in expression (3) determines the methodical error of the device due to the phase shifts in the path. If such a fault is significant, then its decrease can be achieved by choosing a sufficiently small width and spectral bandwidth.

U21, in which (co) () can be considered a constant value within the band, and the feedback channel can be built on the principle of divided and quadrature components, as shown in FIG. 2. For this, parallel to multiplier 7 with integrator 8, another multiplier 11c is introduced. the integrator U2, the outputs of the integrators 8 and 12 through the quadrants 13 and the adder 14 are connected to the input of the comparison unit 9. The second input of the multiplier 11 is connected to the stabilizer 10 via the phase-shifting element 15 with a shift.

Thus, at the outputs: 1: 1 of the integrators, the quadrature components of the total value of 5 (0) act, which, after squaring and summing, give the input of the comparison block 9 a value of 5 (0), independent of the difference cf (sy) -

-1 | 5 (CO).

The device allows to increase the reproducibility of a given spectral characteristic.

Invention Formula

Claims (2)

1. A device for reproducing random vibrations, containing noise generators connected to the inputs of shaping channels, each of which includes series-connected nosal filter, level control unit and a common adder for all channels, an exciter, whose input is connected to an adder output, and a multichannel feedback, including a vibration converter, an analyzer, an integrator, a comparison unit, the second input of which is connected to the level presetter, and the output is “controlling | Mu input of the ur adjustment unit It is equipped with stabilizers of the root-mean-square value of the signal, whose inputs are connected to the outputs corresponding to their band-pass filters, and the analyzer is made in the form of a comb of multipliers, the second input of each lz is connected to the output of the corresponding stabilizer ra. 2. The device according to claim 1, characterized in that, in order to reduce the error due to the phase shift in the path of the oscillator, each feedback channel is provided with an adder connected to the input of the unit compared, and is made with two parallel connected between the adder and the vibrator circuit, each of which includes series-connected multiplier, integrator and quadrator, or this input multiplier of one of circuits connected to the output of the stabilizer through phase shifting link. Sources of information taken into account during the examination: T 1. Authors certificate of the USSR 419755, cl. G 01 M 7/00, 1974. 2. USSR author's certificate number 231180, cl. G 01 M700, 1971 (irototin). 7 - Jj