DD218492A1 - METHOD FOR DETERMINING INCORRECT OPERATING EXPENSES OF TECHNICAL APPLICATIONS - Google Patents

Abstract

The invention relates to a method for determining abnormal Betriebszustaende technical equipment by means of acoustic noise signals. It is the object of the invention to increase the availability of the technical equipment. The invention has for its object to determine the abnormal operating state more accurately. According to the invention, the object is achieved by deriving from a noise signal a plurality of characteristic quantities which correspond to different states of Harvarie. For each characteristic an alarm threshold is given. If a characteristic value is above the alarm threshold, an alarm is triggered, the alarm treatment is carried out as a function of the current measured value of the characteristic variable and / or of other parameters. The use of the characteristic quantities signal level, signal roughness and pulse density for sodium-heated steam generators is particularly advantageous. The characteristic quantities derived from the noise signals can be linked. If the noise signals of several detectors are processed, this can be done sequentially in series or in parallel.

Description

Field of application of the invention

The invention relates to a method for determining abnormal operating _{states of} technical installations by means of acoustic noise signals,

Characteristic of the known technical solutions. ''

It is already known to derive from noise signals of technical equipment signal characteristics, which for. Characterization of the state of these systems can be used (DD-PS 129 385).

Often abnormal operating conditions are expressed by the fact that the acoustic noise signals are superimposed on pulse-shaped events or that the change in the operating state is signaled by a change in the signal power. Pur these cases, it is known, for example, the event density (DD-PS 130 289) or the signal roughness (DD-PS 139 775) to determine or to measure the signal level. With the known solutions, an abnormal operating condition can be detected and an alarm triggered. However, it is not possible to determine whether an abnormal operating condition can be tolerated for a certain period of time or whether the equipment must be shut down immediately in order to avoid major accidents. Because of the necessary safety, the availability of the equipment is lower than its technical condition would enable The same drawbacks also apply to vibration monitoring monitors (Bruel & Kgaer, Multipurpose Monitor Unit Type 5500, CGR) and to sonic emission analyzers that monitor the energy content of pulsed signals (Bruel & Kjaer, Type 4429 Acoustic Emission Pulse Analyzer).

& M. 1983 * 106205 '

Object of the invention

It is the object of the invention to increase the availability of the technical equipment,

Explanation of the essence of the invention

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The invention has for its object to determine the abnormal operating state more accurately. Sriiüdungsgemäß the object is achieved in that derived from a noise signal several parameters. , · Will suit the various accident conditions ·. For each characteristic an alarm threshold is given. If a parameter is above the alarm threshold, an alarm is triggered. The alarm treatment takes place as a function of the current measured value of the parameter and / or of other parameters. '

Particularly advantageous is the use of the parameters signal level, signal roughness and pulse density; for sodium-fired steam generators. The characteristics derived from the noise signals can be linked. If the noise signals of several detectors are processed, this can be done sequentially in series or in parallel.

Embodiment.

The invention will be explained in more detail below using an exemplary embodiment of a sodium-heated steam generator with reference to a detector. · The signal level, signal roughness and pulse density are formed by the noise signal of a detector. For each of the characteristics, calculations or measurements are made in the normal operating state

An alarm is determined by the system, the exceeding of which represents an alarm state for the respective parameter. The level of the alarm threshold can be set for the different parameters in different degrees from the setpoint. If the signal level exceeds a certain alarm threshold, the monitored system is switched off immediately. If the signal roughness and / or the pulse density exceed their alarm thresholds, the system state without shutdown is examined in more detail by checking further system parameters, for example by parameter logging or test procedures, only when it is determined that other system parameters are likely to indicate a significant error , the system is switched off. If the error proves to be minor, measures are taken to ensure the constant monitoring of this error and, in the case of changes, to check further system parameters. Then again a decision on the further operation of the plant is to be made.

Claims (5)

Erfindungsansprucn 1. A method for determining abnormal operating conditions of technical equipment by means of acoustic noise signals, characterized in that a plurality of characteristics are derived from a noise signal, the different accident states correspond to each characteristic an alarm threshold is specified that at , Position of a parameter above the alarm threshold, an alarm is triggered and that the alarm treatment in Ab- v_ /. dependent on the current measured value of the parameter and / or other characteristics. 2. The method according to item 1, characterized in that in particular signal level, signal roughness and pulse density are used as parameters. 3. The method according to item 1, characterized in that the be linked from the noise signals derived characteristics. 4. The method according to item 1, characterized in that the (}. Noise signals from several detectors sequentially serially are processed. 5; Method according to item 1, characterized in that. 'The noise signals of several detectors are processed in parallel.