Claims
- 1. A surge detection device for detecting surge in a turbomachine comprising:
- a sensor attached to a turbomachine or a pipe for monitoring at least one operating parameter selected from a group consisting of flow rate, flow speed and pressure; and
- a computing processor for processing output signals from said sensor and computing fluctuations in at least one operating parameter over a measuring interval of time to detect an onset of surge;
- wherein said fluctuations in said at least one operating parameter are given by a standard deviation of operating data obtained during sampling duration produced by subdivisions of said measuring interval of time.
- 2. A surge detection device as claimed in claim 1, wherein the onset of surge is detected by comparing said fluctuations in said at least one operating parameter with a predetermined threshold value for the onset of surge in the turbomachine.
- 3. A surge detection device as claimed in claim 1, wherein said measuring interval of time is defined by a minimum interval of time required for nullifying fluctuations in said at least one operating parameter caused by fundamental system characteristics associated with blades of an impeller of said turbomachine.
- 4. A surge detection device as claimed in claim 1, wherein said sampling duration is defined by a maximum interval of time required for nullifying fluctuations in said at least one operating parameter caused by fundamental system characteristics associated with blades of an impeller of said turbomachine.
- 5. A surge detection device as claimed in claim 1, wherein said computing processor is provided with a control data input device for determining said measuring interval of time or said sampling duration.
- 6. A surge detection device as claimed in claim 1, wherein said computing processor utilizes a computed ratio of a current fluctuation in said at least one operating parameter to a fluctuation in said at least one operating parameter.
Priority Claims (4)
Number |
Date |
Country |
Kind |
6-132558 |
May 1994 |
JPX |
|
6-138081 |
May 1994 |
JPX |
|
6-138083 |
May 1994 |
JPX |
|
6-129557 |
May 1994 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 08/471,317 filed May 19, 1995 now U.S. Pat. No. 5,683,223.
US Referenced Citations (22)
Foreign Referenced Citations (15)
Number |
Date |
Country |
53-113308 |
Oct 1978 |
JPX |
55-114896 |
Feb 1979 |
JPX |
58-057098 |
Sep 1981 |
JPX |
57-56699 |
Apr 1982 |
JPX |
57 157100 |
Sep 1982 |
JPX |
57-157100 |
Sep 1982 |
JPX |
59-079097 |
Oct 1982 |
JPX |
59-077089 |
Oct 1982 |
JPX |
3199700 |
Dec 1989 |
JPX |
4-47197 |
Feb 1992 |
JPX |
6-17788 |
Jan 1994 |
JPX |
24233 |
Feb 1914 |
GBX |
641635 |
Aug 1950 |
GBX |
731822 |
Jun 1955 |
GBX |
2 060 210 |
Apr 1981 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
471317 |
May 1995 |
|