SU1276994A1 - Device for measuring direction and velocity of current - Google Patents

Abstract

The invention can be used to measure the composition of the flow velocity from a moving carrier. The purpose of the invention is to unify the output signals, to expand the possibilities of use in multichannel systems with centralized channel polling and to reduce energy consumption. Under the action of the incident flow with the velocity vector V rotates at a speed proportional to the component V, the spinner 1, the instantaneous speed of which due to the flyugark 3 changes under the action of the lateral components of the currents V, V. At the time the flyugark 3 passes through the induction sensors 7, 8 , 9 and 10, a short-term connection is made through the switch II of the output of the generator 4 to the storage capacitors C of the calculator 12. At the capacitors C, voltages are generated and stored, the values of which on the terminals a and b are proportional to m-trivial values constituting the V, and X 2 yl. V

Description

The invention relates to instrumentation and can be used to measure the components of the flow velocity from a moving carrier.

The purpose of the invention is the unification of output signals and the expansion of the ULWS capabilities in multi-channel measurement systems with centralized interrogation of channels, as well as the reduction of energy consumption.

Figure 1 shows the structural-kinmatic diagram of the device proposed; figure 2 - diagrams of signals in the device.

The device contains a propeller spinner 1, on the horizontal axis 2 of which the fly-up plate 3 and the generator 4 of a constant 1 eye are rigidly planted, and the lamp 3 is placed in the same plane with a permanent magnet 5 mounted on one of the blades of the wind 1. On the frame 6 along orthogonal axes The location of the electro-induction sensors 7-10, the output of which is connected to the switch 11 connected to the computing device 12. The pinwheel 1 is used to sense the

the longitudinal component V, the velocity velocity vector V, the wind vane 3 — the transverse (horizontal Vy and vertical V) components of the current vector. The DC generator 4 produces a voltage proportional to the angular velocity of rotation of the axis 2. 7-10 captures the time they pass by the permanent magnet 5, and when it is triggered, the control pulses are sent to the switch 11, in which the Kg switches upon activation. the mine condenser is C – C to the output of generator 4 for a time sufficient to fully charge the capacitors with instantaneous voltage at the output of the generator. This time is approximately three times the time constant of the electrical circuit, which includes the generator winding and the capacitor,

The principle of operation of the device is as follows.

When the carrier moves, the spinner I and the wind vane 3 are acted upon by a counter flow, which has the value of V modulo and the components along the axis V V, V and V (Fig.). If the transverse components of velocity V

and V.

At „2 are equal to zero, then I influence the wind vane, they modulate the speed of rotation about

axle 2. Assume that V 0 and V O (Fig. 2a). In the upper semicircle, the direction of movement of the vane 3 clockwise coincides with

direction Vk, and in the lower half of the yness these stresses are opposite. Due to this, the instantaneous speed of the axis of rotation 2 increases in the upper semicircle, reaching a maximum value at the moment of crossing the plane of the wind vane with sensor 8 and the minimum - with sensor 10. generated voltage

and at the moment - the minimum.

It is obvious that the component does not affect the fly-gun at time points t and t ,, if

struts on the axis of the rotor are non-inertia. In the case of inertia of the design, these time points are shifted by a certain amount of delay, and their attachment will correspond to the middle, the charging time interval of the capacitors. Similarly, at times t and t, from component V-j, yO, the angular velocity of axis 2 is positively modulated in the left semicircle and negative in the right one (Fig. 2b).

Let us establish an analytical relation between the instantaneous angular velocity of axis 2 at moments, times t ,,, t, t, and t with the component V; and Vy flow rates.

Since Vy, V. proportional to the angular velocity gfaschey J axis ppiofBTBa 2, and the tension produced by the generator 4, is proportional to

CL).

then you can record and „AV. + Bv

and. AV

WU.

at

(12)

X y

where A and B are some coefficients, the numerical values of which are constant for the given construction and are found experimentally.

Add the expression (2), then

(one)

with expressions

JLl 2A

(3)

55

From expression (1) subtract expression (2), then

V,

Ui - and.

.AT

(four)

Similarly

V.

g 2B

The device works as follows.

Under the action of the avoiding flow with the velocity vector V rotates at a speed proportional to the component V, the spinner 1, the instantaneous speed of which due to the flyugark 3 changes under the influence of the lateral components of the flow Vy, V .. At the moments of the passage of the electric flux induction sensors 7, 8, 9 and 10, a short-term connection is made through the switch 11 of the output of the generator 4 to the storage capacitors Cg of the calculator 12.

In this case, at time t, (Fig. 2a), the signal from sensor 7 short-circuits key K., and the positive pole of generator 4, is applied to capacitor C, which is charged to voltage U, proportional to the instantaneous sum of components U and, i.e.

and, AV + BV.

Voltage U is stored on capacitor C.

At time t,., The signal from sensor 8 closes the keys K, K and K and the positive pole of the generator is fed to the terminals b of the capacitor chains V and V, and the negative pole to the midpoint in the chain of capacitors V. In this case, capacitors Cj and Cj charge and remember the voltage And /, equal to

and AV - BVy. At time t, the signal with

sensor 9 closes key K and the positive pole of the generator is supplied

to pin b and chain capacitors vj. At the same time, capacitor C, charges and remembers the voltage U, and, AV - BV ,.

at time t, the keys Kg, K and K are closed with a signal from the sensor 10, and the positive pole of the generator is fed to the output of the chain of capacitors V and output to the chains of capacitors V, to the output of which is fed the negative pole of the generator.

At the same time, capacitors C and Cg charge and store the voltage and AV, - 3Vy.

Thus, voltages are formed and stored on the capacitor chains, the value of which on terminals a and b is proportional to 5 values of the components V, V and V in accordance with expressions 3, 4 and 5.

ten

Claims (2)

The invention relates to instrument engineering and can be used to measure the components of the flow velocity from a moving carrier. The purpose of the invention is to unify the output signals and expand the use of ULT in multi-channel measurement systems with centralized channel polling, as well as reduce power consumption. Figure 1 shows the structural-kinematical diagram of the device proposed; figure 2 - diagrams of signals in the device. The device contains a propeller fan 1, on the horizontal axis 2 of which the fly-gun 3 and the generator 4 of a constant 1 are rigidly seated, and the curtain 3 is placed in one plane with a permanent magnet 5 mounted on one of the blades of the car-gun 1. On the frame 6 along orthogonal The axes are located by electric induction sensors 7-10, the output of which is connected to the switch 11 connected to the computing device 12. The pinwheel 1 serves to perceive the longitudinal component V, the vector V of the flow velocity, the wind vane 3 - transverse (horizontal Vy and vertical v) components of the flow vector. The DC generator 4 generates a voltage proportional to the angular velocity of rotation of the axis 2. 7-10 captures the time they pass by the permanent magnet 5, and when it is triggered, the control pulses are sent to the switch 11, in which the keys connect the memory C when activated. - From to the output of generator 4 for a time sufficient for a full charge of capacitors to be instantaneous voltage at the output of the generator. This time is about three times longer than the time constant of the electrical circuit, in which the input is a generator winding and a capacitor. The operating principle of the device is as follows. When the carrier moves, the counter-flow acts on the turntables I and the wind vane 3, which has the value of V modulo and the components along the axis V V, V and V (Fig.). If the transverse components of the velocity V V2 are zero, then they modulate the speed of rotation about the axis 94 2. Suppose that V 0 and V O (Fig. 2a). In the upper semicircle, the direction of movement of the wind vane 3 clockwise coincides with the direction of Vk, and in the lower semicircle these stresses are opposite. Due to this, the instantaneous speed of the axis of rotation 2 increases in the upper semicircle, reaching a maximum value at the time of crossing the plane of the wind vane with sensor 8 and the minimum - with sensor 10. Since the change in the angular speed of axis 2 is proportional to the voltage generated by the generator, then at time t will be the maximum value generated voltage, and at the moment - the minimum. It is obvious that the component does not affect the vial at times t and t, if the construction on the axis of the spinner is inertia-free. In the case of inertia of the design, these time points are shifted by a certain amount of delay, and their attachment will correspond to the middle, the charging time interval of the capacitors. Similarly, at times t and t, from component V-j, yO, the angular velocity of axis 2 is positively modulated in the left semicircle and negative in the right one (Fig. 2b). Let us establish an analytical relation between the instantaneous angular velocity of axis 2 at moments, times t ,,, t, t, and t with the component V; and Vy flow rates. Since Vy, V. proportional to the angular velocity gfascheny J axis pfiCTBa 2, and the tension, produced by generator 4, is proportional to what can be recorded and "AV. + Bv and. AV X where, where A and B are some coefficients, the numerical values of which are constant for the given design and are found experimentally. If we add the expression to expression (2), then expression (2) subtracts expression (2), then Ui - and. Similar to V. g 2B The device operates as follows. Under the action of the avoiding flow with the velocity vector V rotates at a speed proportional to the component V, the spinner 1, the instantaneous rate of which due to the fly-arc 3 changes from the side components of the flow Vy, V. .. At the moment of passing the fluarck of the electric induction sensors 7 , 8, 9, and 10, a short-term connection via the switch 11 of the generator 4 output to the storage capacitors Cg of the calculator 12 is made. At the time t, (Fig. 2a), the signal from the sensor 7 short-circuits the key K., and - lay veal pole of the generator 4 is supplied to the capacitor C which is charged to a voltage U ,, proportional to the instantaneous sum of components and and U, i.e. and, AV + BV. Voltage U is stored on capacitor C. At time t,., The signal from sensor 8 closes the keys K, K and K and the positive pole of the generator is fed to the terminals b of the capacitor chains V and V, and the negative pole to the midpoint in the chain of capacitors V. In this case, the capacitors Cj and Cj charge and remember the voltage And /, equal to and, AV - BVy. At time t, the signal from sensor 9 closes the key K and the positive pole of the generator is fed to pin b and the chain of capacitors Vj. In this case, the capacitor C is charged and remembers the voltage U, and, AV - BV ,. at time t, the keys Kg, K and K are closed by a signal from sensor 10, and the positive pole of the generator is fed to the output of the capacitor circuit V and output to the capacitor chains V, to the output of which is fed the negative pole of the generator. At the same time, capacitors C and Cg charge and store the voltage and AV, - 3Vy. Thus, voltages are formed and stored on the capacitor chains, the value of which at terminals a and b is proportional to the values of the components V, V and V in accordance with expressions 3, 4 and 5. The formula of the invention A device for measuring the direction and flow velocity containing a propeller spinner mounted in a fixed frame, in one blade of which a permanent magnet, a flyugar fixed on the same axis as the spinner and fixed in the same plane as a permanent magnet, are mounted; four induction sensors mounted on the frame in pairs in the vertical and horizontal planes is symmetrical to the axis of the fan connected via a switch with a calculator, so that, in order to unify the input signals and expand the possibilities of use in multi-channel measurement systems, DC generator mounted on the axis with a spinner, while the switch is made of eight keys, and the numerator is in the form of three chains of memory capacitors connected in series, and the first generator output connected to the inputs of the first, second, third, fourth, fifth, sixth and seventh keys, the second output of the generator is connected to the inputs of the third and eighth keys and middle points of the second and third chains of storage capacitors, the output of the first key is connected to the input of the third chain, the output of the second the key is connected to the output of the second chain of capacitors, the outputs of the third and seventh keys are combined and connected to the midpoint of the first chain of capacitors, the output of the fourth key is connected to the output of the second circuit of the capacitors, The output of the first pin is connected to the output of the third chain of capacitors, the output of the sixth switch is connected to the input of the second chain of capacitors, the output of the eighth switch is connected to the input of the first chain of capacitors, the outputs of horizontal induction sensors are connected to the control inputs of the first five keys, the output of one from the induction sensors located in the e vertical plane, is connected to the control inputs of the sixth, seventh and eighth keys, the output of the other is connected to the control inputs of the second. 1 276994b of the third and fourth keys, and the inputs and outputs of the first, second and third chains of storage capacitors are connected respectively to the outputs 5 of the calculator. Ui v t. Y, 4 II A U.-f (} jL t t, tj t 1