SU1260686A2 - Device for measuring dynamic parameters of revolving object members - Google Patents

Abstract

The invention relates to information and measurement technology. It can be used to measure dynamic parameters (pressure, deformations) of the elements of rotating objects-rotors of electrical machines, gas turbine engines, centrifuges. It is additional to auth. USSR No. 1027520. In a device comprising a direct current device 1, a generator 2, a tensor-suppressor 3, a recording unit 4, supplying a transformer-type current collector 5 containing a moving winding 6, a primary winding 7, a feedback winding 8 transmitting the current collector 9 transformer type, containing a movable, stationary, compensating winding 10, 11, 12, DC amplifier 13, to achieve neJHi, a passive double pole 14 (PD) is inserted. As PD 14 can be used resistor. In addition to the resistor, a capacitor or a complex connection of R-L-C elements can be connected. The introduction of PD allows us to reduce the non-uniformity of the amplitude-frequency characteristic and expand the range of controlled frequencies of the dynamic parameter. 1 yl w (LMM 15

Description

The invention relates to information-measuring technology, can be used to measure the dynamic parameters (pressure, deformations) of elements of rotating objects - rotors of electrical machines, gas turbine engines, centrifuges, etc. and is an improvement on the basic invention by ed. No. 1027520.

The aim of the invention is to expand the range of monitored frequencies.

The drawing shows a diagram of a device for measuring the dynamic parameters of elements of rotating objects.

A device for measuring the dynamic parameters of the elements of rotating objects contains a DC amplifier 1, a generator 2, a resistor 3, a recording unit 4 of a transformer-type powering current collector 5 containing a moving winding 6, a primary winding 7 and a feedback winding, the first terminals of which are connected among themselves, the end of the primary winding 7 is connected to the common wire, and the end of the feedback winding 8 is connected to the input of the DC-1 amplifier, to the output of which the generator 2 is connected, the output of the generator 2 is connected With the combined leads of the primary winding 7 and the feedback winding 8, a transformer-type current collector 9, containing a moving, fixed and compensating winding. 10, 11 12, a compensating winding 12 located in the stator part of the transmitting current collector 9, an additional amplifier 13 DC, the end of the fixed and the beginning of the compensating windings 11 and 12 are connected to the common wire, and the beginning of the fixed winding 11 is connected to the input of the additional DC amplifier 13, the output of which is connected to the input p The registering unit 4 and the end of the compensating winding 12, the passive Bipolar 14, located on the rotating object 15, the movable windings 6 and 10 of the power supply and the transmitting current collectors 5 and 9 are connected in series with the strainer resistor 3 and form a closed loop, and the passive bipolar circuit 14 is connected parallel moving area

five

a coil 6 of the supply current collector 5. In the simplest case, a resistor can be used as a passive two-terminal 1D. In addition to a resistor, a capacitor or some complex connection of R-L-C-elements can be connected.

The internal circuit of the passive two-port 14 and the ratings of the elements included in it are selected from the conditions for ensuring minimum dependence on the resistance frequency determined by parallel connection of the inductance of the moving winding 6 of the supply current collector 5 and the impedance of the passive two-pole 14.

The device works as follows.

A rectangular voltage generator 2, a direct current amplifier 1, and a supply current collector 5 provide the resistance of the strain gauge 3 with a rectangular current. The effect of a controlled parameter on a strain resistor 3 causes a modulation of the current flowing through it. The additional DC amplifier 13 and the transmitting current collector 9 with movable fixed and compensating windings 10-12 provide the input to the input of the recording unit 4 of rectangular voltage, the top of which is modulated by the useful signal.

The alternating current carrying information about the monitored parameter is closed in a circuit containing moving windings 6 and 10. Parallel. The movable winding 6 is connected to a passive two-port 14. In the absence of a two-port 14, the inductive component of the output resistance of the supply current collector 5 of the transformer type increases in proportion to the frequency of the useful signal and reaches a considerable value compared to other resistances of the measuring circuit. This leads to a significant decrease in the sensitivity of the measuring circuit to changes in the resistance of the strain gauge 3, blocking the frequency response of the device at high frequencies and reducing the range of monitored frequencies of the dynamic parameter.

When a passive two-pole connection is connected (in the simplest case, Resis 1

A torus with resistance R) the resistance of the measuring target circuit at high frequencies approaches a constant value equal to where R is the resistance of the strain gauge, which eliminates the frequency response in the high frequency range and extends the range of monitored frequencies of the dynamic parameter.

Thus, the introduction of a passive two-pole allows us to reduce the non-uniformity of the amplitude-frequency characteristic and expand the range of controlled frequencies of the dynamic parameter, which eliminates the need to develop complex electronic signals.

Editor N.Gorvat

Compiled by K.Shubin Tehred L.Oleinik

Order 5214/36 Edition 705 Subscription

VNIISH State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

-.Production and printing company, Uzhgorod, st. Project, 4

60686. 4

correcting blocks and allows to increase the accuracy of measurement of high-frequency dynamic parameters.

Claims (1)

5 claims A device for measuring the dynamic parameters of the elements of rotating objects according to ed. No. 1027520, 10 characterized in that, in order to expand the range of monitored frequencies, a passive two-terminal connected in parallel is inserted into the rotating object of the device. f5 movable winding of the power current collector. Corrector S.Cherni