CN110595637B - Monitoring system and method for temperature of stern shaft - Google Patents
Monitoring system and method for temperature of stern shaft Download PDFInfo
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- CN110595637B CN110595637B CN201910866954.3A CN201910866954A CN110595637B CN 110595637 B CN110595637 B CN 110595637B CN 201910866954 A CN201910866954 A CN 201910866954A CN 110595637 B CN110595637 B CN 110595637B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000012935 Averaging Methods 0.000 claims description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a system and a method for monitoring the temperature of a stern shaft, wherein the system comprises a temperature sensor, a rotating speed sensor, a liquid level telemetering module, a storage module and a monitoring module; the temperature sensor is used for collecting temperature information of the stern shaft; the rotating speed sensor is used for collecting rotating speed information of the stern shaft; the storage module is used for storing temperature information, rotation speed information and draft information according to a preset mode; the monitoring module is used for acquiring a temperature change rate by combining the temperature information, the rotating speed information, the draft information and a preset database, and monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate. According to the invention, after the temperature and the rotating speed information of the stern shaft are collected in real time, the temperature of the stern shaft is monitored by combining the temperature information and the temperature change rate, so that the over-high temperature of the stern shaft can be avoided without relying on experienced engineers, the pilot navigation cost is greatly reduced, and the method can be widely applied to the field of ship pilot navigation.
Description
Technical Field
The invention relates to the field of ship pilot, in particular to a system and a method for monitoring the temperature of a stern shaft.
Background
When a ship built by a shipyard is subjected to pilot navigation, a series of accidents of high temperature of the stern shaft occur at one time, after the accidents occur, the ship needs to be docked for a second time to reprocess the stern shaft, and pilot navigation is performed again after the processing; thus, not only is a significant expense incurred, but also the ship delivery node is affected.
Therefore, during the subsequent ship pilot, each shipyard may arrange for experienced engineers to manually monitor the temperature of the stern shaft by dedicated personnel and manually control the rotational speed of the propeller when appropriate to ensure that the stern shaft temperature is not too high to avoid damage to the stern shaft. However, since experienced engineers are relatively few and the airtime period is relatively long, relying too much on experienced engineers increases costs indirectly.
Noun interpretation:
stern shaft: the stern shaft, also called tail shaft. The stern shaft is the last section of shaft in the shafting, and the head end flange is connected with the intermediate shaft flange by a close-fit bolt; the tail end is conical and is used for installing a propeller. The stern shaft is forged from high quality carbon steel.
And (3) pilot testing: pilot is usually the last stage in ship construction, and there is also pilot process after the ship is docked for overhaul. The pilot is conducted in open water for several hours or even days. English is sea three. The maneuvering performance of the ship can be tested and whether the ship is navigable (seaworth) or not by pilot.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an automatic stern shaft temperature monitoring system and method.
The first technical scheme adopted by the invention is as follows:
a monitoring system of stern shaft temperature comprises a temperature sensor, a rotation speed sensor, a liquid level telemetry module, a storage module and a monitoring module;
the temperature sensor is used for collecting temperature information of the stern shaft;
the rotating speed sensor is used for collecting rotating speed information of the stern shaft;
the liquid level telemetry module is used for collecting draft information of the ship;
the storage module is used for storing temperature information, rotation speed information and draft information according to a preset mode;
the monitoring module is used for acquiring a temperature change rate by combining the temperature information, the rotating speed information, the draft information and a preset database, and monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate.
Further, the intelligent monitoring system further comprises a display module, and the display module is connected with the monitoring module.
Further, the intelligent monitoring system further comprises a warning module, and the warning module is connected with the monitoring module.
Further, the storage module specifically stores temperature information, rotation speed information and draft information in the following manner:
the temperature information, the rotation speed information, and the draft information at the same time are stored as a set of data in order of the time axis.
The second technical scheme adopted by the invention is as follows:
a monitoring method of stern shaft temperature includes the following steps:
acquiring temperature information, rotation speed information and draft information, and storing the temperature information, the rotation speed information and the draft information according to a preset mode;
acquiring a temperature change rate by combining temperature information, rotation speed information, draft information and a preset database;
and monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate.
Further, the step of storing the temperature information, the rotation speed information and the draft information according to a preset mode specifically includes:
the temperature information, the rotation speed information, and the draft information at the same time are stored as a set of data in order of the time axis.
Further, the step of acquiring the temperature change rate by combining the temperature information, the rotation speed information, the draft information and the preset database specifically comprises the following steps:
acquiring a temperature and rotating speed change relation curve corresponding to the same draft from a preset database according to draft information;
and acquiring the temperature change rate of the temperature and the rotating speed by combining the temperature information, the rotating speed information and the temperature and rotating speed change relation curve.
Further, the step of monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate specifically comprises the following steps:
after the current temperature value is obtained according to the temperature information, the temperature rise time is predicted by combining the temperature value, the temperature change rate and the preset highest temperature value;
and when the detected temperature rise time is smaller than or equal to the preset time period, controlling the stern shaft to reduce the rotating speed.
Further, the method further comprises the step of displaying a temperature change curve, wherein the step of displaying the temperature change curve specifically comprises the following steps:
drawing a historical temperature change curve according to stored data according to the sequence of the time axis, and displaying the historical temperature change curve by adopting a first display format;
and drawing a temperature change trend curve according to the current temperature and the predicted temperature rise time, and displaying the temperature change trend curve by adopting a second display format.
Further, the step of obtaining the temperature and rotation speed change relation curve corresponding to the same draft from a preset database according to draft information specifically comprises the following steps:
after obtaining a plurality of groups of data for averaging, obtaining a draft average value, a rotating speed average value and a temperature average value;
and obtaining a temperature and rotating speed change relation curve corresponding to the same draft from the database according to the draft average value.
The beneficial effects of the invention are as follows: according to the invention, after the temperature and the rotating speed information of the stern shaft are collected in real time, the temperature of the stern shaft is monitored by combining the temperature information and the temperature change rate, so that the temperature of the stern shaft is prevented from being too high without relying on experienced engineers, and the pilot navigation cost is greatly reduced.
Drawings
FIG. 1 is a block diagram of a system for monitoring the temperature of a stern shaft according to the present invention;
FIG. 2 is a flow chart of steps of a method for monitoring temperature of a stern shaft according to the present invention;
fig. 3 is a graph showing temperature change in the embodiment.
Detailed Description
As shown in fig. 1, the embodiment provides a monitoring system for temperature of a stern shaft, which comprises a temperature sensor, a rotation speed sensor, a liquid level telemetry module, a storage module and a monitoring module;
the temperature sensor is used for collecting temperature information of the stern shaft;
the rotating speed sensor is used for collecting rotating speed information of the stern shaft;
the liquid level telemetry module is used for collecting draft information of the ship;
the storage module is used for storing temperature information, rotation speed information and draft information according to a preset mode;
the monitoring module is used for acquiring a temperature change rate by combining the temperature information, the rotating speed information, the draft information and a preset database, and monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate.
The temperature sensor is arranged on the stern shaft and used for collecting temperature information of the stern shaft in real time, transmitting the temperature information to the storage module, and storing the temperature information after the storage module converts the temperature information. The rotating speed sensor is arranged on the stern shaft and used for collecting rotating speed information of the stern shaft in real time, transmitting the rotating speed information to the storage module, and storing the rotating speed information after the storage module converts the rotating speed information. The draft information, namely the information of the draft of the ship, is provided by liquid level telemetry system equipment loaded on the ship, and the liquid level telemetry module is installed on the ship. The storage module stores the received temperature information, rotation speed information and draft information, for example, an average value of draft can be calculated first, then the average value represents draft of a ship for a certain period of time as shown in table 1, and for the temperature information and rotation speed information, real-time recording and storage are performed, and the temperature and rotation speed are matched and stored as shown in table 2.
TABLE 1
TABLE 2
| Time T: | T | T+1S | T+2S | T+3S | T+4S | T+5S | T+6S | T+7S | T+8S | … |
| stern shaft rotational speed Rpm: | Rpm | * | * | * | * | * | * | * | * | … |
| temperature of the stern shaft: | * | * | * | * | * | * | * | * | * | * |
since at different draft, the same speed of rotation of the stern shaft causes different temperature changes (increases) of the stern shaft, i.e. the temperature changes are different; the temperature of the stern shaft is in proportional relation with the rotational speed of the stern shaft, namely, the faster the stern shaft rotates, the faster the temperature rises, and the main reason is that the heat is generated by friction between the stern shaft and water. Therefore, the current temperature change rate is obtained by combining the temperature information, the rotation speed information and the draft information, and then whether the stern shaft needs to be controlled is judged by combining the temperature information and the temperature change rate, for example, when the current temperature is judged to be too high and the temperature change rate is also relatively high, the monitoring module sends a speed reducing instruction to the propulsion host, and the propulsion host is controlled to reduce the rotation speed of the stern shaft.
The preset database is a pre-established database and mainly stores corresponding information of the temperature, the rotating speed and the draft of the stern shaft, and specifically, the database is built in a three-dimensional coordinate format, an X axis of the three-dimensional coordinate corresponds to the temperature of the stern shaft, a Y axis of the three-dimensional coordinate corresponds to the rotating speed of the stern shaft, and a Z axis of the three-dimensional coordinate corresponds to the draft of the ship. Specifically, the historical data stored in the form of groups is fed back to a database for updating the relation curve of the optimized temperature and the rotating speed. The database is used as a basis for predicting the high temperature of the stern shaft and can be continuously updated according to stored data so as to improve the accuracy of the high temperature early warning of the stern shaft.
Further as a preferred embodiment, the device further comprises a display module, wherein the display module is connected with the monitoring module.
The display module is used for displaying the temperature and the rotating speed of the current stern shaft and displaying the change condition of the temperature of the stern shaft on a time axis, so that a worker can conveniently know the working state of the ship in real time.
Further as a preferred implementation manner, the intelligent monitoring system further comprises a warning module, and the warning module is connected with the monitoring module.
The warning module is used for sending out warning information when the monitoring module monitors that the temperature of the stern shaft is too high. In particular, the warning module may be an audible alarm and/or a flashing light alarm.
Further, as a preferred embodiment, the storage module specifically stores temperature information, rotation speed information and draft information in the following manner:
the temperature information, the rotation speed information, and the draft information at the same time are stored as a set of data in order of the time axis.
As shown in fig. 2, the embodiment further provides a method for monitoring the temperature of the stern shaft, which includes the following steps:
s1, acquiring temperature information, rotation speed information and draft information, and storing the temperature information, the rotation speed information and the draft information according to a preset mode;
s2, acquiring a temperature change rate by combining temperature information, rotation speed information, draft information and a preset database;
and S3, monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate.
In the method of the embodiment, temperature information and rotation speed information of the stern shaft and draft information of the ship are collected in real time, the temperature information is a time temperature value and temperature change of the stern shaft, the rotation speed is a time rotation speed value and rotation speed change of the stern shaft, the draft information can be detected by liquid level remote sensing system equipment in the ship and then sent to a storage module for storage, and the preset database stores temperature and rotation speed change data at different draft. Because at different draft, the same speed of rotation of the stern shaft causes different temperature changes of the stern shaft, i.e. the temperature change is different; the temperature of the stern shaft is in a proportional relation with the rotational speed of the stern shaft, so that the temperature change rate is required to be obtained by combining temperature information, rotational speed information and draft information, wherein the temperature change rate is the rate of temperature change under the current temperature and rotational speed conditions, namely, the time required for changing each time by 1 ℃. Finally, the temperature of the stern shaft is monitored by combining the temperature information and the temperature change rate, and if the temperature is at a high value at the moment, but the temperature change tends to 0, the temperature tends to be stable at the moment, and the stern shaft is not required to be controlled. If the temperature is at the intermediate temperature value at this time, but the temperature change rate is high, the temperature may reach the preset highest point in a short time, so that reminding is needed; when the temperature is too high or the entering temperature is about to rise rapidly, a warning is sent out or the rotating speed of the stern shaft is controlled, so that the stern shaft is prevented from being damaged due to the too high stern shaft; in addition, the monitoring is carried out without relying on experienced engineers, so that the cost of ship pilot navigation is reduced.
The step S1 specifically includes:
after the temperature information, the rotation speed information and the draft information are collected, the temperature information, the rotation speed information and the draft information at the same time are stored as a group of data in a time axis as a sequence.
Storing the temperature information, the rotating speed information and the draft information in a time corresponding mode by taking time as a sequence; in particular, a three-dimensional data table may be established.
Specifically, step S2 includes steps S21 to S22:
s21, acquiring a temperature and rotating speed change relation curve corresponding to the same draft from a preset database according to draft information;
s22, acquiring the temperature change rate at the temperature and the rotating speed by combining the temperature information, the rotating speed information and the temperature and rotating speed change relation curve.
Wherein step S21 specifically comprises steps A1-A2:
a1, obtaining a draught average value, a rotating speed average value and a temperature average value after obtaining a plurality of groups of data to perform average value;
a2, acquiring temperature and rotating speed change relation curves corresponding to the same draft from a database according to the draft average value.
Specifically, step S3 includes steps S31 to S32:
s31, after the current temperature value is obtained according to the temperature information, predicting the temperature rise time by combining the temperature value, the temperature change rate and a preset highest temperature value;
and S32, controlling the stern shaft to reduce the rotating speed when the detected and determined temperature rise time is smaller than or equal to a preset time period.
The temperature change rate is obtained by carrying out time derivative calculation on the curve according to the rotation speed information after obtaining the corresponding change relation curve according to the draft information, and the change condition of the temperature under the same temperature and rotation speed can be calculated according to the temperature change rate. The time for reaching the preset highest temperature, namely the temperature rise time, can be calculated and obtained by combining the current temperature value and the temperature change rate, and if the time is smaller than the preset time, a warning is sent out, so that the stern shaft is prevented from entering the highest temperature area, and the damage of the stern shaft is avoided.
Specifically, since the rotation speed may be in a varying condition, such as the rotation speed is in a positive acceleration period, the surrounding multiple sets of data are obtained to perform average calculation, so that the condition of temperature variation can be better reflected. In this embodiment, the preset time period is 15 minutes, that is, when it is detected that the maximum temperature value of the stern shaft possibly reached within 15 minutes is preset, an alarm is sent, or the stern shaft is controlled to reduce the rotation speed.
Referring to fig. 3, a preferred embodiment further includes a step of displaying a temperature change curve, and the step specifically includes steps B1 to B2:
b1, drawing a historical temperature change curve according to stored data according to the sequence of a time axis, and displaying the historical temperature change curve by adopting a first display format;
and B2, drawing a temperature change trend curve according to the current temperature and the predicted temperature rise time, and displaying the temperature change trend curve by adopting a second display format.
The displaying step is used for displaying the temperature change condition and the rotation speed change condition of the stern shaft in real time, when displaying the temperature change condition, a first display format is adopted for displaying a historical temperature change curve, and a second display format is adopted for displaying a predicted temperature change curve, in the embodiment, the first display format is adopted for displaying by a solid line, and the second display format is adopted for displaying by a dotted line. The staff can control the stern shaft to carry out different tests through the displayed temperature curve conveniently and intuitively, and the temperature of the stern shaft and the solid line pilot run are controlled more effectively.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (7)
1. The monitoring system for the temperature of the stern shaft is characterized by comprising a temperature sensor, a rotating speed sensor, a liquid level telemetering module, a storage module and a monitoring module;
the temperature sensor is used for collecting temperature information of the stern shaft;
the rotating speed sensor is used for collecting rotating speed information of the stern shaft;
the liquid level telemetry module is used for collecting draft information of the ship;
the storage module is used for storing temperature information, rotation speed information and draft information according to a preset mode;
the monitoring module is used for acquiring a temperature change rate by combining temperature information, rotation speed information, draft information and a preset database, and monitoring the temperature of the stern shaft by combining the temperature information and the temperature change rate;
the system also comprises a display module, wherein the display module is connected with the monitoring module;
the storage module specifically stores temperature information, rotation speed information and draft information in the following manner:
the temperature information, the rotation speed information, and the draft information at the same time are stored as a set of data in order of the time axis.
2. The stern shaft temperature monitoring system of claim 1 further comprising a warning module coupled to the monitoring module.
3. The method for monitoring the temperature of the stern shaft is characterized by comprising the following steps of:
acquiring temperature information, rotation speed information and draft information, and storing the temperature information, the rotation speed information and the draft information according to a preset mode;
acquiring a temperature change rate by combining temperature information, rotation speed information, draft information and a preset database;
the temperature of the stern shaft is monitored by combining the temperature information and the temperature change rate;
the step of storing the temperature information, the rotation speed information and the draft information according to a preset mode comprises the following specific steps:
the temperature information, the rotation speed information, and the draft information at the same time are stored as a set of data in order of the time axis.
4. The method for monitoring temperature of a stern shaft according to claim 3, wherein the step of acquiring the temperature change rate by combining the temperature information, the rotation speed information, the draft information and the preset database comprises the following steps:
acquiring a temperature and rotating speed change relation curve corresponding to the same draft from a preset database according to draft information;
and acquiring the temperature change rate of the temperature and the rotating speed by combining the temperature information, the rotating speed information and the temperature and rotating speed change relation curve.
5. The method for monitoring temperature of a stern shaft as set forth in claim 4, wherein the step of monitoring temperature of the stern shaft by combining the temperature information and the temperature change rate comprises the steps of:
after the current temperature value is obtained according to the temperature information, the temperature rise time is predicted by combining the temperature value, the temperature change rate and the preset highest temperature value;
and when the detected temperature rise time is smaller than or equal to the preset time period, controlling the stern shaft to reduce the rotating speed.
6. The method for monitoring temperature of a stern shaft according to claim 4, further comprising the step of displaying a temperature change curve, wherein the step of displaying the temperature change curve specifically comprises:
drawing a historical temperature change curve according to stored data according to the sequence of the time axis, and displaying the historical temperature change curve by adopting a first display format;
and drawing a temperature change trend curve according to the current temperature and the predicted temperature rise time, and displaying the temperature change trend curve by adopting a second display format.
7. The method for monitoring temperature of a stern shaft according to claim 4, wherein the step of obtaining the temperature-rotation speed variation relationship curve corresponding to the same draft from a preset database according to draft information comprises the following steps:
after obtaining a plurality of groups of data for averaging, obtaining a draft average value, a rotating speed average value and a temperature average value; and obtaining a temperature and rotating speed change relation curve corresponding to the same draft from the database according to the draft average value.
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| CN201910866954.3A CN110595637B (en) | 2019-09-12 | 2019-09-12 | Monitoring system and method for temperature of stern shaft |
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| SU1652189A1 (en) * | 1989-05-18 | 1991-05-30 | Предприятие П/Я Ж-1026 | Device for automatic control of back pressure in ship stern tube bearing seal |
| KR20050061426A (en) * | 2005-05-31 | 2005-06-22 | 오진석 | Control system for pump of cooling system for ship |
| CN101992837A (en) * | 2010-10-27 | 2011-03-30 | 天津大学 | Risk early-warning method of marine propulsion shafting |
| CN104697653A (en) * | 2015-02-10 | 2015-06-10 | 上海交通大学 | Temperature pre-warning system for key equipment of ultrahigh-pressure power distributing station based on web |
| KR20180077538A (en) * | 2016-12-29 | 2018-07-09 | 대우조선해양 주식회사 | Apparatus and method for analyzing operation pattern of ship |
| CN210464706U (en) * | 2019-09-12 | 2020-05-05 | 广州中交通信有限公司 | Monitoring system for stern shaft temperature |
-
2019
- 2019-09-12 CN CN201910866954.3A patent/CN110595637B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1652189A1 (en) * | 1989-05-18 | 1991-05-30 | Предприятие П/Я Ж-1026 | Device for automatic control of back pressure in ship stern tube bearing seal |
| KR20050061426A (en) * | 2005-05-31 | 2005-06-22 | 오진석 | Control system for pump of cooling system for ship |
| CN101992837A (en) * | 2010-10-27 | 2011-03-30 | 天津大学 | Risk early-warning method of marine propulsion shafting |
| CN104697653A (en) * | 2015-02-10 | 2015-06-10 | 上海交通大学 | Temperature pre-warning system for key equipment of ultrahigh-pressure power distributing station based on web |
| KR20180077538A (en) * | 2016-12-29 | 2018-07-09 | 대우조선해양 주식회사 | Apparatus and method for analyzing operation pattern of ship |
| CN210464706U (en) * | 2019-09-12 | 2020-05-05 | 广州中交通信有限公司 | Monitoring system for stern shaft temperature |
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