JP3348444B2 - Parameter abnormal runout detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation speed of a low-pressure side rotating shaft or a high-pressure side rotating shaft employed in a gas turbine abnormality detecting system for detecting a malfunction of a gas turbine engine and a malfunction of control. The present invention relates to a parameter abnormal vibration detection method for detecting abnormal vibration of a parameter such as a rotation speed.

[0002]

2. Description of the Related Art For example, a gas turbine engine is provided with a gas turbine abnormality detection system for detecting an operation abnormality and a control defect. In such a system, there are various factors such as an engine temperature, an engine torque, and an engine speed as factors for judging abnormality. One of them is a parameter fluctuation. It measures the rotation axis of the rotation axis of the low-pressure side compressor, the rotation number of the rotation axis of the high-pressure side compressor, and the torque obtained from the rotation axis of the low-pressure side compressor constantly, and the measured value is constant within a certain frequency band. If it swings up and down more than the amplitude, it is determined that an abnormality has occurred.

[0003]

Conventionally, in order to detect that a parameter fluctuates more than a certain amplitude in a certain frequency band, a signal passed through a band filter is processed or a Fourier transform is performed. To do this, you need special hardware,
The software has the disadvantage that the software is large and the calculation time is long.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a parameter abnormal vibration detection method capable of judging abnormal parameter vibration by a very simple calculation without requiring special hardware. The purpose is to do.

[0005]

According to the present invention, in order to achieve the above object, it is determined whether or not an input parameter is within a preset allowable range.
When the input parameter is shifted to the upper limit side according to the input parameter, the upper limit value matches the input parameter .
Slide the so that tolerance to the upper limit set newly, the input parameters when the input parameter is shifted to the lower side
Shift the allowable range to the lower limit so that the lower limit matches the
While making new settings, the input parameters are
If you are Tsu the allowable range as it is, the input parameters are new next time the input parameters have been entered
Alternating the set or determined whether is within the allowable range as such, the following repeating this, within a predetermined time, the input parameters are the upper or lower limit of the allowable range
It is determined whether or not the number of times exceeds the predetermined number of times, and the input parameter alternates between the upper limit and the lower limit of the allowable range.
When the number of times exceeds the predetermined number or more, it is determined that an abnormality has occurred.

[0006]

According to the input parameter, the allowable range of the input parameter is shifted to the upper limit or the lower limit and is newly set or is kept as it is, and the next input parameter is newly set.
The set or determined whether is within the allowable range of intact into and within a predetermined time, whether or not the number of times the input parameter exceeds the upper or lower limit of the allowable range alternately becomes equal to or more than a predetermined number of times Judgment, if the number of times the input parameter alternately exceeds the upper limit or lower limit of the allowable range is equal to or more than a predetermined number, the presence or absence of an abnormality is determined. It can be detected and no special hardware is required.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a method for detecting abnormal fluctuation of a parameter according to the present invention.
Is a gas turbine engine, 2 is an abnormality detection device, 3 is a detection and display device for displaying that an abnormality has occurred, and 4 is a data reading device for reading data around the time when an abnormality occurs.

The gas turbine 1 is obtained from a sensor 5a for detecting the rotation speed of the rotation shaft of the low-pressure compressor, a sensor 5b for measuring the rotation speed of the rotation shaft of the high-pressure compressor, and a rotation shaft of the low-pressure compressor. Sensors 5c for detecting torque are provided, and detection signals from those sensors are sent to the abnormality detection device 2. Note that other engine parameters such as temperature are also sent to the abnormality detection device 2.

The detection signals sent from the sensors 5a... Are read by a digital counter as required by the abnormality detection device 2, and the read signals are sent to the abnormality detection logic 6 and the memory (RAM) 7.

The abnormality detection logic 6 determines whether or not there is an abnormality according to the means described later. If an abnormality is detected, the detection and display device 3 including a meter, a lamp, or the like indicates that there is an abnormality. At the same time, Ta + Tb (Ta
... Time immediately before the abnormality is detected, Tb (time immediately after the abnormality is detected), and data for seconds are written from the memory 7 to the nonvolatile memory 8. Then, after the operation of the engine, the data before and after the occurrence of the abnormality recorded in the nonvolatile memory 8 is read out through the communication line or the like, and the cause of the abnormality can be searched for by analyzing the data.

In the abnormality detection logic, the rotation speed of the rotation shaft of the low-pressure compressor, the rotation speed of the rotation shaft of the high-pressure compressor, and all the parameters of the torque obtained from the rotation shaft of the low-pressure compressor are caused by abnormal swing. If so, it is determined that an abnormality has occurred.

Next, referring to FIGS. 2 and 3, the abnormality detection logic 6 will be described in detail by taking as an example the case of detecting an abnormal fluctuation of the torque obtained from the low-pressure side compressor rotating shaft.

A detection signal is sent in the form of a digital signal from a sensor 5c for detecting the torque obtained from the low-pressure side compressor rotating shaft (step 1). It is determined whether the value is larger than the value (step 2). If it is larger, the upper limit of the allowable detection width is replaced with the value of the input parameter, and the lower limit of the allowable detection width is replaced with a value obtained by subtracting the allowable detection width from the input parameter (steps 3 and 4). Then, the parameter flag NO. 1 is set to "1" (step 5). On the other hand, if the input parameter is equal to or smaller than the upper limit of the allowable detection width, the process proceeds to the next step 6 as it is.

In step 6, it is determined whether or not the input parameter is smaller than a preset lower limit of the allowable detection width.
If it is smaller, the lower limit of the allowable detection width is replaced with the value of the input parameter, and the upper limit of the allowable detection width is replaced with a value obtained by adding the allowable detection width to the input parameter (steps 7 and 8). Then, the parameter flag NO. 1 is set to "0" (step 9). On the other hand, if the input parameter is equal to or larger than the lower limit value of the allowable detection width, the process proceeds to the next step 10 as it is.

In step 10, the parameter flag N
O. The value of 1 is the last time (the detection of this logic is, for example, 0.
(Which is performed every fixed time such as 025 seconds), in other words, whether the input parameter is changing from increasing to decreasing or vice versa. If it has turned, the process proceeds to step 11, and if it has not, the process proceeds to step 14.

At step 11, the counter NO. 1 is a preset counter NO. 1 is determined to be greater than the minimum value. 2 is increased by 1 (steps 11 and 12). If it is less than that, the counter NO. 1 is reset to "0" (step 13).

Here, the counter NO. Setting the minimum value and the maximum value of 1 means determining the standard of the range of the detection frequency. That is, fmin = 1 / ｛2 × (the maximum value of the counter No. 1) ×
(Cycle time)｝ fmax = 1 / ｛2 × (minimum value of counter No. 1) ×
(Cycle time) サ イ ク ル The cycle time means a time interval at which the detection logic is repeatedly executed. Therefore, this detection logic can detect an abnormal shake of the frequency f where fmin <f <fmax. For example, the counter NO. The maximum value of 1 is 19
6. If the minimum value is defined as 1, fmin = 1/2 × 196 × 0.025 = 0.1 (Hz) fmax = 1/2 × 1 × 0.025 = 20.00 (H
z) As a result, f eventually detects a swing of a frequency larger than 0.1 and smaller than 20.00. Step 14
Then, the counter NO. 1 is a counter NO. It is determined whether or not the value is greater than the maximum value of 1. If the value is greater than 1, the process proceeds to step 15; And
In step 15, the counter NO. After resetting "1" to "0", the counter NO. 2 is determined to be greater than or equal to "0". While 2 is reduced to only 1 while it is "0", the process directly proceeds to step 18 (steps 15, 16, 17).

At step 18, the counter NO. 2 is a counter NO. It is determined whether or not it is larger than the maximum value of 2, and if it is larger, a flag indicating a parameter swing is set (step 19).

After setting as described above, the counter NO.
2 is a counter NO. 2 in the same manner as when the counter NO. 1 is increased by “1”, and the parameter flag NO. The current value of 1 is saved and the process is terminated (steps 20 to 22). Here, the counter NO. Setting the maximum value of 2 means determining the number of times the camera shakes before determining that the camera shakes.
O. The maximum value of 2 is this number (the number of shakes for detection) ×
2 is set.

The above logic is performed not only for the torque obtained from the rotating shaft of the low-pressure compressor, but also for each of the rotating speed of the rotating shaft of the low-pressure compressor and the rotating shaft of the high-pressure compressor. Is detected, it is determined that "abnormal vibration" has occurred. In the above detection method, the allowable detection width, the counter NO. 1 and the counter NO. By appropriately setting the maximum value and the minimum value of 2 and the cycle time of the detection logic, it is possible to detect “abnormal shake” of a parameter having a certain amplitude or more in a frequency band determined by the cycle time.

It should be noted that the method for detecting abnormal fluctuation of the parameter of the present invention is limited to only the torque obtained from the rotating shaft of the low-pressure compressor, the rotating speed of the rotating shaft of the low-pressure compressor, and the rotating speed of the rotating shaft of the high-pressure compressor. Needless to say, the present invention can be applied to various parameters.

[0022]

As described above, according to the present invention, it is determined whether or not an input parameter is within a preset allowable range. If not, the input parameter is set according to the input parameter. when you are displaced to the upper side, the input parameters when the upper limit value to the input parameter newly set by shifting to the upper side of the tolerance <br/> to match the input parameter is shifted to the lower side If the lower limit is
While newly set by shifting the match so tolerance to the lower limit, if the input parameter is within the allowable range
, Leave the allowable range as it is, and when the next input parameter is input, determine whether the input parameter is newly set or within the allowable range,
This is repeated below, and the input parameters are
It is determined whether the number of times exceeding the upper limit or lower limit of the allowable range alternately exceeds a predetermined number, and
When the number of times exceeding the upper limit or lower limit of the permissible range alternately exceeds a predetermined number of times, it is determined that an abnormality has occurred. An abnormal fluctuation of a parameter can be easily detected without using hardware or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing an embodiment of the present invention.

FIG. 3 is a flowchart following FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas turbine engine 2 Abnormality detection device 3 Detection display device 4 Data readout device 6 Abnormality detection logic

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-258955 (JP, A) JP-A-57-60246 (JP, A) JP-A-4-19344 (JP, A) JP-A-2-2 204648 (JP, A) Japanese Utility Model 62-12704 (JP, U) Japanese Utility Model Application Hei 3-106148 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F01D 1/00-21 / 20 F01K 1/00-27/02 F02C 1/00-9/58 F02D 43/00-45/00 F23R 3/00-7/00

Claims (1)

(57) [Claims] 1. A input parameter determines whether or not fall within the permissible range set in advance, if not contained, in response to the input parameter, when the input parameter is shifted to the upper side, the input The upper limit value matches the parameter
The allowable range is newly set by shifting to the upper side as, the input parameters when the input parameter is shifted to the lower side
New shifted to the lower side of the tolerance range so that the lower limit value matches the
The input parameters are within the acceptable range.
When the input parameter is input next time, it is determined whether the input parameter is newly set or within the allowable range when the next input parameter is input. Repeatedly, the input parameter alternates between the upper limit and lower limit of the allowable range within a predetermined time.
It is determined whether the number of times exceeds the predetermined number or more, and the input parameter alternates between the upper limit and the lower limit of the allowable range.
An abnormal vibration detection method for a parameter, wherein it is determined that an abnormality has occurred when the number of times exceeds a predetermined number.