DD281654A5 - ARRANGEMENT FOR MULTIVALENT SIGNAL RECORDING, PROCESSING AND EVALUATION - Google Patents

Abstract

The arrangement for multivalued signal acquisition, processing and evaluation is applicable where a variety of non-stationary measurement tasks are to be handled. The object of the invention is to develop a circuit arrangement which makes it possible to collect diagnostic state information with minimal technical effort, with as many as possible different measuring and diagnostic methods to be realized. According to the invention, this is achieved by the circuit arrangement shown in FIG. Fig. 1 {computer technology; Computer link; technical diagnosis; multivalent malt value processing; Automation; Microcomputer; Schaedigungszustand}

Description

For this 1 page drawing

Field of application of the invention

The invention is particularly applicable where a comprehensive system diagnostics exists, but also where a variety of non-stationary measurement tasks to be handled.

Characteristic of the known technical solutions

The basis of the condition-based maintenance of machines and plants is the exact knowledge of the damage condition of the corresponding plant. The information on the state of damage is obtained using methods of technical diagnostics. In addition to the methods of direct diagnostics, the methods of indirect diagnostics are increasingly used, which include damage diagnosis during operation, ie. H. without disassembly.

The devices and device configurations used for the diagnosis of damage to machinery and equipment are subdivided into the following main groups:

- simple inspection equipment

This group of devices includes stationary and mobile devices that allow monitoring of one or more diagnostic parameters. The evaluation of the diagnostic information is done mainly on the basis of accumulated experience.

As inspection equipment z. B. known:

Vibration monitoring devices, temperature measuring devices, vibration testers from various manufacturers.

- Computer-aided measuring and evaluation equipment

This device group also includes stationary and mobile measuring technology, the use of which is provided both under laboratory and under operating conditions.

The devices work partly with complex signal evaluation functions. The evaluation of the results is also based on experience gained.

There are e.g. Vibrationsmeßverfahren, materials testing based on ultrasound basis, etc., based by z. B.

Real-time analyzers, FFT analyzers, signal analysis computers are device-technically geared.

- Computer-aided measuring technology in combination with central computer systems

The measuring technology within this device group is primarily intended for mobile use. The coupling with central computer systems is used for reading in and out of data and the information collected with the measuring technique. At measuring and diagnostic technique of this group are known:

• Vibration Analyzer M 1302 with PC 1715 from VEB Robotron Messtechnik Dresden,

• Bearing Analyzer BEA52 with MAC 10 from SPM instrument,

• Datacollector System from IRD,

• VibrocamSOOOderCarl-SchenckAG.

Due to the large number of recently developed component-specific diagnostic methods, a large range of devices is required in large companies to enforce comprehensive system monitoring, both for obtaining and evaluating the diagnostic information. In addition to the high investment costs for the procurement of equipment technology, of course, there is also a high operating and maintenance costs. The different methods of measurement and analysis also place high demands on the qualifications of the operating personnel because of the different equipment and operating philosophies, see e.g.

- Rankes, D .:

Change in maintenance due to technical progress Machine damage 61 (1988), No. 2, pp. 63-68

- Collocat, R .: Mechanical Fault Diagnoses Chapman and Hall, London, 1977

It is therefore necessary to develop an arrangement whose technical reduction minimizes the number of devices used for monitoring or determining the state of the condition, while maintaining or increasing the quality of the individual devices.

Object of the invention

The aim of the invention is to realize a maximum scope of specific diagnostic tasks on machinery and equipment, taking into account a minimum device complexity, ultimately to make the maintenance effort more effective.

Explanation of the essence of the invention

The invention has for its object to develop a circuit arrangement that makes it possible to collect state information with minimal technical effort, with as many different measurement and diagnostic procedures to be realized.

This is achieved by the circuit arrangement shown in FIG. 1 according to the invention. At the input 1, one or more sensors are connected according to the measuring method used. Via an input switch 2, the signal passes either to a converter 3 or an amplifier 4. To the amplifier 4, a switch 5 is connected, which is followed by a filter module 6, which in turn is connected at its output to a switch 7. At the output is another amplifier 8 to which also a switch 9 is located. The outputs of this switch 9 are connected to an analog-to-digital converter 10 or with a pulse shaper 11 whose output is another switch 12 is located. The outputs of the switch 12 are located on the computer bus 18 and at a counter 13. At an output 14 of the circuit arrangement, a digital-to-analog converter 15 and a controllable generator 19 is connected. The microcomputer 16 is connected to all mentioned modules via the computer bus 18. As a further output of the arrangement, an interface 17 is connected to the microcomputer 16

 The arrangement realizes the following function:

Depending on the type of output signal of the sensor connected to the input 1, the signal is supplied to the amplifier 4 either directly or via a converter 3 with the input switch 2.

The output signal of this amplifier 4 is amplified again in a further amplifier 8. Optionally, via the switches 5 and 7, a filter module 6 are turned on in the amplification channel. The digitization of the amplified signal takes place either in the analog-to-digital converter 10 or via a pulse shaper 11. While the analog-to-digital converter 10 operates directly on the computer bus 18, the output signal of the pulse shaper 11 can either directly or via a counter 13 the computer bus 18 are switched. The preprocessing of the Impulsmeßgrößen by the counter 13 serves to increase the operating speed. About the digital-to-analog converter 15 are e.g. provided the voltages needed for active sensors. The microcomputer 16 works on the computer bus 18 with all modules together. The microcomputer (16) is used for

- control of the analog part,

- recording the resulting measurement data,

Preprocessing according to predetermined diagnostic or measurement detection algorithms,

- correspondence with the operator (keyboard, display),

- interface work,

- Caching of the diagnosis or measurement results.

The measured values buffered in the measuring instrument are transferred via the interface 17 to the host computer for further processing. By reprogramming the diagnostic device, which takes place via the host computer, it can be converted into another diagnostic or measuring device.

embodiment

The exemplary embodiment will be explained with reference to the wall thickness measurement by means of ultrasound and the vibration measurement, see FIG. 1.

1. Wall thickness measurement

Via the host computer, the program for the wall thickness measurement is transferred to the microcomputer 16 of the diagnostic device.

Thereafter, the receiver-side part of the test head is connected to the input 1, while the transmitter of the test head is to be coupled to the output 14. The microcomputer takes over the control of the Meßvorgänges in the following manner:

Via the controllable oscillator 19, the ultrasonic pulse groups are generated and emitted via the transmitter of the test head. The reflected groups of pulses picks up the receiver, whereupon they are amplified in the amplifiers 4 and 8 so that they can be adapted to the computer in the pulse shaper 11. From the time difference and the speed of sound, the wall thickness is calculated, displayed and stored. 2. Vibration measurement

For vibration measurement, the corresponding program is likewise transferred to the microcomputer 16 via the host computer. A vibration sensor (eg piezoelectric accelerometer) is connected to input 1. About the amplifier 4 and 8, the signal is processed for the analog-to-digital converter 10 and converted there. Optionally, via the switches 5 and 7 of the filter module 6 with, predetermined by the microcomputer 16 corner frequencies, between the amplifier 4 and 8 are turned on. In the microcomputer 16, the further processing and evaluation of the output signal of the analog-to-digital converter 10, z. B. in the form that the RMS value, peak is formed, single or multiple integrations, Fourier transformations, power spectral density formations, complex parameter calculations such. B. K (t) as a reference of the product of the peak value and RMS value of the vibration acceleration in the zero state to the same product at other times, performed.

When using passive sensors, eg. B. inductive displacement sensor, these are also connected to the input. The required carrier frequency is provided, controlled by the microcomputer 16, via the oscillator 19 at the output 14. The further signal processing takes place in the same way as when using active sensors.

In addition to the tasks already mentioned, see essence of the invention, the microcomputer 16 realizes other functions, such. As the automatic calibration, automatic range selection, dialog programs, Meßwertverarbeitungsalgorithmen, etc. With the described arrangement, the following measurement and diagnostic methods can be realized:

- vibration measurement,

- wall thickness measurement,

- crack test,

- Material testing,

- conductivity measurement,

- temperature measurement,

- measurement of optical parameters,

- measurement of electrical parameters (digital multimeters),

- Wave vibration measurement according to the eddy current principle,

- radiation measurement,

- Impulsdichteeschwankung the sound emission.

Claims (2)

1. Arrangement for multivalent signal acquisition, processing and evaluation, consisting of electronic signal processing, signal generating circuits, signal conductors and switches, for processing technical diagnostic tasks on machines and systems, characterized in that at least one sensor to an input (1) is connected and is connected via an input switch (2) either directly or via a converter (3) with a first amplifier (4) whose output is connected to a switch (5), in turn, either directly or via a filter module (6) with a further switch (7) whose output is connected to a further amplifier (8) to which a switch (9) is connected, the outputs of which are connected to an analog-to-digital converter (10) or to a pulse shaper (11) and the Output of the pulse shaper (11) to a switch (12), the outputs of which gel either directly or via a counter (13) to the computer bus (18) egt are controlled by a microcomputer (16) and the microcomputer (16) via the computer bus (18) with all other modules (1) ... (14) is connected and at the outputs of the microcomputer (16) an interface (17), a digital-to-analog converter (15) and an oscillator (19) are outputs of the device. 2. Arrangement according to claim 1, characterized in that the microcomputer (16) via the computer bus (18) by means of the interface (17) is coupled to an external host computer, whereby the microcomputer (16) via the host computer to re-implement different measuring and diagnostic tasks becomes.