公开(公告)号：EP0507829B1

公开(公告)日：1996-10-30

申请号：EP91901848.1

申请日：1990-12-24

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： ROSS, Colin, Fraser

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/125 ,  G10K2210/128 ,  G10K2210/1281 ,  G10K2210/12822 ,  G10K2210/129 ,  G10K2210/3019 ,  G10K2210/3032 ,  G10K2210/511

Abstract: An active vibration reducing system for controlling the vibration generated by a source of periodic or quasi-periodic vibration is characterised in that a weighted sum of the output of at least two sinusoidal waveform generators each synchronised to the frequency of the source of original vibration to generate harmonics of the frequency of the source, is supplied to at least one actuator (5) which generates additional vibration, sensor means (6) is used to monitor the effect of the additional vibration on the original vibration and the weighting of the sum of the outputs is adjusted so that within a defined region the amplitude of the combined vibration is reduced.

公开(公告)号：EP0516705A1

公开(公告)日：1992-12-09

申请号：EP91904982.0

申请日：1991-02-20

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： ROSS, Colin, Fraser ,  LANGLEY, Andrew, John ,  EATWELL, Graham, Paul

IPC: F01B25 ,  F01N1 ,  F02B27 ,  F02M35

CPC classification number: F01N1/065 ,  F02B27/001 ,  F02M35/1038 ,  F02M35/125 ,  Y02T10/146

Abstract: Un système de commande permet d'améliorer la commande dynamique en continu de la pression dans les sytèmes de sortie et/ou d'entrée (3) d'une machine (1) afin de commander la performance de la machine. Le système comprend un actuateur (4) qui permet de modifier la pression dans le système sélectionné, un capteur (8) de surveillance du fonctionnement de la machine qui génère un signal représentatif du fonctionnement et une unité de commande (5) sensible aux signaux du capteur qui actionne l'actuateur. L'unité de commande ajuste la performance de la machine selon des données prédéterminées afin d'optimiser la performance de la machine. Ces données peuvent être enregistrées en mémoire (table de consultation) ou l'unité de commande peut fonctionner en fonction d'un algorithme. Un deuxième capteur peut être installé pour générer un signal représentatif du bruit produit par les systèmes de sortie et/ou d'entrée afin de générer des signaux qui permettent à l'unité de commande de réduire le bruit généré par la machine en même temps qu'elle améliore la performance de la machine par un signal actif en retour.

公开(公告)号：EP0507829A1

公开(公告)日：1992-10-14

申请号：EP91901848.0

申请日：1990-12-24

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： ROSS, Colin, Fraser

IPC: G10K11

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/125 ,  G10K2210/128 ,  G10K2210/1281 ,  G10K2210/12822 ,  G10K2210/129 ,  G10K2210/3019 ,  G10K2210/3032 ,  G10K2210/511

Abstract: An active vibration reducing system for controlling the vibration generated by a source of periodic or quasi-periodic vibration is characterised in that a weighted sum of the output of at least two sinusoidal waveform generators each synchronised to the frequency of the source of original vibration to generate harmonics of the frequency of the source, is supplied to at least one actuator (5) which generates additional vibration, sensor means (6) is used to monitor the effect of the additional vibration on the original vibration and the weighting of the sum of the outputs is adjusted so that within a defined region the amplitude of the combined vibration is reduced.

公开(公告)号：EP0516705B1

公开(公告)日：1995-08-16

申请号：EP91904982.5

申请日：1991-02-20

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： ROSS, Colin, Fraser ,  LANGLEY, Andrew, John ,  EATWELL, Graham, Paul

IPC: F02B27/00 ,  F01N1/06

CPC classification number: F01N1/065 ,  F02B27/001 ,  F02M35/1038 ,  F02M35/125 ,  Y02T10/146

Abstract: A control system is described for improving continuous dynamical control on the pressure in the outlet or inlet system (3) or both of a machine (1) in order to control the performance of the machine. The system comprises an actuator (4) for varying the pressure in the selected system, a sensor (8) for monitoring the operation of the machine and producing a signal indicative thereof, and control means (5) responsive to the sensor signals for driving the actuator, wherein the control means operates to adjust the machine performance according to predetermined data, to optimise the machine performance. The data may be in a memory (look-up table) or the control means may operate in accordance with an algorithm. A second sensor may be provided to generate a signal indicative of sound produced by one or other or both of the outlet and inlet systems to produce signals to enable the control means simultaneously to reduce noise generated by the machine as well as to improve the performance of the machine by active feedback.