Abstract:
Verfahren zur Früherkennung von Ventilschäden in oszillierenden Verdrängerpumpen mit drei oder mehr Zylindern mit oder ohne gemeinsamen Pumpenkopf durch signalbasierte Auswertung gemessener Druck- und Körperschallsignale, Digitalisierung der Drucksignale Berechnung von Korrelationskoeffizienten mittels Kovarianzanalyse unter Verwendung des Verlaufs des Körperschalls an jedem Zylinder bei Abwesenheit eines gemeinsamen Pumpenkopf oder unter Verwendung fiktiver Schwingungsbeschleunigungssignale für jeden Zylinder und Zuordnung eines Ventilschadens zu einem Zylinder bei Anwesenheit eines gemeinsamen Pumpenkopfs sowie Auslösen eines Alarms bei Überschreitung und/oder Unterschreitung vorgegebener Schwellenwerte für die Korrelationskoeffizienten sowie oszillierende Verdrängerpumpen mit integrierten Sensoren zur Verwendung in diesen Verfahren.
Abstract:
Disclosed is a method for analyzing vibrations in a machine (2), particularly an axial piston machine (2). In said method, a vibration behavior detected in an actual state of the machine (2) that is connected to a random plant (62) is converted, by means of a transfer function, into a vibration behavior corresponding to the machine (2) that is connected to a reference plant (60) in the actual state of the machine (2). The transfer function is formed as a ratio between a vibration behavior of the machine (2) that is connected to the reference plant (60) in a starting state of the machine and a vibration behavior of the machine (2) that is connected to any other plant (64) in the starting state of the machine (2), in order to compare the vibration behavior of the machine (2) that is connected to the reference plant (60) in the actual state to the vibration behavior of the machine (2) that is connected to the reference plant (60) in the starting state of the machine (2). Also disclosed are a device (72) and a computer program for carrying out said method.
Abstract:
Die Erfindung betrifft eine Vorrichtung (1) zur Zustandsüberwachung bei hydrostatischen Verdrängereinheiten (2), insbesondere bei als Pumpe oder als Motor betriebenen Axialkolbenmaschinen (3) . Die Vorrichtung (1) umfasst eine Erfassungseinheit (4) mit einer Vielzahl von an der hydrostatischen Verdrängereinheit (2) angebrachten Sensoren (5) zur Erfassung von Überwachungsdaten (6) und Betriebsdaten (7), sowie eine Auswerteeinheit (8), die eine Einrichtung (9) zur Analyse der Überwachungsdaten im Frequenzbereich und eine Einrichtung (10) zur Analyse der Überwachungsdaten im Zeitbereich aufweist. An die Auswerteeinheit (8) schließt sich eine Diagnoseeinheit (11) mit einer Ausgabeeinheit (13) an.
Abstract:
A condition monitoring system (12) for use with a reciprocating device is provided. The condition monitoring system includes at least one pressure sensor (116) configured to sense a pressure within the reciprocating device, at least one vibration sensor (132) configured to sense a vibration of the reciprocating device, and a protection system (22) communicatively coupled to the pressure sensor and the vibration sensor, the protection system configured to calculate a stiffness value of the reciprocating device based on the sensed pressure within the reciprocating device and the sensed vibration of the reciprocating device.
Abstract:
A diagnosis method is for a hydraulic machine 10 including a rotational shaft 12, a plurality of cylinders 14, a plurality of pistons 16, and a casing 18 for accommodating the cylinders 14 and pistons 16. The pistons 16 are each guided by corresponding one of the cylinders 14 to reciprocate in relation to rotation of the rotational shaft 12. The diagnosis method includes a vibration detection step of detecting vibration of the casing 18 by a vibration sensor 2 disposed on the casing 18 while rotating the rotational shaft 12 in an unloaded state of the hydraulic machine 10 and a determination step of determining, on the basis of a detection result detected by the vibration sensor 2, whether a piston jump phenomenon which is accompanied by collision and separation of at least one of the pistons 16 with respect to a rotational shaft 12 side has occurred.
Abstract:
The present invention relates to a control system for hermetic cooling compressor, which includes a reciprocating compressor (3) and an electronic control (2) for the reciprocating compressor (3), the electronic control (2) being configured for, after commanding the turning off of the reciprocating compressor (3), detecting whether the turn velocity (23) of the turning axle (10) is below a predefined velocity level, and then applying a braking torque (36) that causes deceleration of the turning axle (10) before completing the next turn of the turning axle (10), in case the turn velocity (23) detected is below the velocity level (34).
Abstract:
A condition monitoring system (12) for use with a reciprocating device is provided. The condition monitoring system includes at least one pressure sensor (116) configured to sense a pressure within the reciprocating device, at least one vibration sensor (132) configured to sense a vibration of the reciprocating device, and a protection system (22) communicatively coupled to the pressure sensor and the vibration sensor, the protection system configured to calculate a stiffness value of the reciprocating device based on the sensed pressure within the reciprocating device and the sensed vibration of the reciprocating device.
Abstract:
The invention relates to a method for the early detection of damage to valves in oscillating displacement pumps comprising at least three cylinders with or without a common pump head, by signal-based evaluation of measured pressure and structure-borne noise signals, digitalisation of the pressure signals, calculation of correlation coefficients by means of covariance analysis using the distribution of the structure-borne noise on each cylinder in the absence of a common pump head, or using fictive oscillation acceleration signals for each cylinder and associating valve damage to a cylinder in the presence of a common pump head, and triggering an alarm if pre-defined threshold values for the correlation coefficients are exceeded or not reached. The invention also relates to oscillating displacement pumps with integrated sensors for use in said method.
Abstract:
Eine Sicherheitseinrichtung an einer Pumpe weist eine Druckentlastungsleitung (20) auf, welche durch das Öffnen eines Entlastungsventils (16) die Auslaßleitung (22) mit der Einlaßleitung (12) verbinden kann. Hierdurch wird die Pumpe kurzgeschlossen und kann, z.B. bei übermäßiger Erhitzung, verdichtungsfrei zur Abkühlung weiterbetrieben werden. Außerdem kann so ein Entweichen von Gas in die Umgebungsatmosphäre verhindert werden. Das Öffnen des Entlastungsventils (16) wird vorzugsweise durch einen Störfalldetektor (4) veranlaßt, welcher das Überschreiten eines betriebsrelevanten Wertes, wie. z.B. Temperatur, Druck oder Vibrationsniveau erfaßt.