SU1672197A1 - Part wear measurement device - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the wear of products. The aim of the invention is to improve the measurement accuracy by taking into account measurement error and compensating for the effect of noise. When measuring, the mechanical oscillations of the monitored product 1 using sensor 2, amplifier 3 and converter 4 are converted into 512 discrete samples, which are compared with 512 discrete values of the defect-free product stored in the memory 16 of reference functions. The deviation signal λ _and in the binary code is stored in block 5. At the same time, in the buffer register 11, the value of the deviation measurement error Δ λ _and is recorded. At the output of the adder 14, the exact deviation value λ _t = λ _and + Δ λ _{and is formed} . From the constant memory 19 in the block 15 the comparison reference values λ are transmitted _on a specific calibration curve which is compared with * 00t, and detects a value of 00o * number at which the difference λ _m - λ _of minimal. According to this number, the corresponding amount of wear in physical units is selected from the permanent storage device 20. 2 hp f-ly, 3 ill.

Description

The invention relates to measuring technique and can be used to measure wear of products.

The aim of the invention is to improve the accuracy of measurements.

In FIG. 1 shows a diagram of a device for measuring wear of products ’in FIG. 2 block diagram of the measurement error determination; in FIG. 3 is a diagram of a memory block of reference values.

The device contains a measuring sensor 2 fixed to the monitored product 1, an amplifier 3 of the measuring information signals, a signal converter 4 made in the form of an analog-to-code converter and a normalized autocorrelation function meter that works according to the algorithm / M Ό =

Σ x (kTo) x (kT _o 4-p) k = ⁰

K = 0 where P (kT _o ) is the quantized vibration signal x (t); x (kT ₀ h η) - quantized and delayed by the time η vibration signal x (t), J ----- 0. 1,2, ... 511;

N is the number of samples;

k is the sample number;

That = 512 Δτ is the period between samples;

Δ t is the sampling step, the first comparison unit 5, the measurement error determination unit, made in the form of adders 6-8, register 9. divider 10, buffer register 11, delay circuit 12 and read-only memory unit 13, adder 14, second comparison unit 15 , reference function memory unit 16, reference value memory unit made in the form of a start circuit 17, address generation circuit 18, read-only memory 19 of reference values and read-only memory 20 of wear values, a signal detection unit 21, a synchronization unit 22 and tschetns-registrtsruyuitsy unit 23.

In the block 16 of the memory recorded previously measured standard normalized autocorrelation Function p (t) of the vibration signal of a defect-free product in the form of 512 discrete values. In the block 13 of the permanent memory, the code of the number 2 is recorded. In the constant memory devices 19 and 20, the ordinate values and the corresponding wear values are recorded in the physical values of the calibration graph.

The device operates as follows.

When the device is turned on, the mechanical vibrations of the monitored product 1 with the help of the sensor 2 are converted into an electric signal, which, after amplification in the amplifier 3, is fed to the input of the converter 4 by the start command and the output of which records the discrete normalized autocorrelation function / λι (t) from 512 discrete samples. On command Stop block 21 the detection signal in block 22 the synchronization is generated read pulse ⁿ of which the block 5, comparison is connected to the block 16 of memory reference function and compares the values of the functions (τ ') and p _o (t) of the real and defect-free products and stores the deviation signal corresponding to the expression m

= Σ (Λι (η) ~ p ₀ (η)] о = о and represented in binary code proportional to wear.

The values of the functions p ₀ (η) and / λι (Tj) simultaneously go to the inputs of the quadrators of adder 6 to obtain the sum [/% (η) + ρζ (η)], which is fed to one of the inputs of adder 7, to another input which receives a constant value of 2 from the block 13 of permanent memory. From the output of the adder 7, the information goes to the accumulating adder 8 and then to the register 9 for intermediate storage of the accumulated amount m _

Σ [2 + / ^ (η) + ^ (η)].

J = 0

In the divider 10, the accumulated sum is divided by the number of samples of the signal under study. in the buffer register 11, the value of the error of measurement of the deviation Δλυ is fixed. The adder 14 receives signals Λι from block 5 ΔΑυ from register 11. And the exact deviation value At = - Ao + ΔΑ _{υ is} generated, which is stored in the output register of the adder 14. By command from the synchronization unit 22, circuits 17 and 18 provide serial transmission from a constant of the storage device 19 to the block 15 for comparing the reference values of A, a particular calibration schedule, which are compared with the exact value λτ in the register of the adder 14. As a result, the number of the value of Lo is fixed. corresponding to the minimum value of the difference Л _Т - / 1 _О. The code of this number is fixed in the output register of block 15, by which the corresponding amount of wear in physical units is selected from the permanent storage device 20. This value is supplied to the buffer register of the reading and recording unit 23, which displays the value of the wear of the product in physical quantities.

Claims (3)

Claim 1. A device for measuring wear of products, comprising a sensor mounted on the product and a signal amplifier connected in series with it, a signal converter, a first comparison unit, an indication unit and an electrically connected synchronization unit, a reference function memory unit, a signal detection unit and a readout-recording unit unit, characterized in that, in order to improve the accuracy of measurements, it is equipped with a unit for determining the measurement error, two information inputs of which are connected respectively to the information the outputs of the signal converter, the third information input is with the information output of the reference function memory block, one of the control inputs is connected to the End of data of the synchronization block output, and the other control input is connected to the Start of the signal detection block, by an adder, the information inputs of which are connected respectively to the information outputs the first comparison unit and the unit for determining the measurement error, and the control inputs are connected respectively to the outputs End of data of the synchronization unit and The start of the signal detection unit, the second comparison unit, one of the information inputs of which is connected to the information output of the adder, and a memory unit of reference values, the information outputs of which are connected respectively to the other information input of the second comparison unit and to the reading-recording unit, and the control inputs are connected respectively, with the outputs End of Data and Clock of the synchronization block and with the control output of the second comparison block. 2. The device according to claim 1, t and h and ch e ness of those. that the unit for determining the measurement error is made in the form of series-connected first, second and accumulating adders, the information inputs of the first of which are connected to the outputs of the signal converter and the memory block of the reference functions, a register, the input of which is connected to the output of the accumulating adder, and one of the outputs is connected to input accumulating adder. a divider, the information inputs of which are connected respectively to the outputs of the register and the signal converter, and the control input is connected to the output; Start the signal detection unit, a buffer register connected between the divider and the adder, a delay circuit installed between the end output of the synchronization unit and the control input of the buffer register, and a read-only memory block connected to the information input of the second adder. 3. The device is popl. Characterized by the fact that the memory unit of the reference values is made in the form of series-connected start-up circuit and address generator. the output of which is connected to a read-only memory of reference values connected to a second comparison unit and a read-only memory of wear values. From block k MW5 From δ AOχα 12 Lance. data From the flea k ΐΟζΏΐύ— No. 1ΗΪΓ ~ From ΰλοχα 16 ABOUT N ^L from ylkayp start FIG. 2 Figure 3