CN116443215A - Online monitoring method for sinking amount and vibration of ship outboard tail shaft - Google Patents
Online monitoring method for sinking amount and vibration of ship outboard tail shaft Download PDFInfo
- Publication number
- CN116443215A CN116443215A CN202211498472.5A CN202211498472A CN116443215A CN 116443215 A CN116443215 A CN 116443215A CN 202211498472 A CN202211498472 A CN 202211498472A CN 116443215 A CN116443215 A CN 116443215A
- Authority
- CN
- China
- Prior art keywords
- tail shaft
- vibration
- outboard
- shaft
- ship
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005299 abrasion Methods 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims description 59
- 238000009434 installation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000003449 preventive effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B79/00—Monitoring properties or operating parameters of vessels in operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B79/00—Monitoring properties or operating parameters of vessels in operation
- B63B79/10—Monitoring properties or operating parameters of vessels in operation using sensors, e.g. pressure sensors, strain gauges or accelerometers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to the technical field of ship measurement equipment, in particular to an on-line monitoring method for the sinking quantity and vibration of an outboard tail shaft of a ship. The method fills the blank of the online real-time monitoring means of the existing ship outboard tail shaft, can replace the traditional manual mechanical measuring method, and improves convenience and instantaneity; the multifunctional integration is realized, and the integration of abrasion loss, abrasion line type and transverse vibration monitoring of the tail shaft is realized; the universal ship is strong in universality and good in environmental adaptability, and can be applied to the fields of civil high-end ships, water-surface ships, underwater submarines and the like; the method can provide an effective means for the preventive maintenance of the ship and also provide effective support for the intelligent monitoring, operation and management of a ship propulsion system in the future.
Description
Technical Field
The invention relates to the technical field of ship measurement equipment, in particular to an on-line monitoring method for the sinking quantity and vibration of an outboard tail shaft of a ship.
Background
The tail shaft is an important component of a ship propulsion shafting, the tail end of the tail shaft is provided with a propeller, and the head end of the tail shaft is connected with other shafting transmission equipment in the cabin through a coupler to play a role in transmitting the torque of a main engine and the thrust of the propeller. The tail shaft is mostly located outboard and supported by water lubricated tail shaft bearings also located outboard. Due to the unbalance of the rotating parts and the rotor dynamics of the concentrated mass-cantilever system formed by the propeller and the tail shaft, the propulsion shafting can generate rotary (transverse) vibration when running, wherein the tail end of the outboard tail shaft is one of the parts with the largest vibration amplitude. The shafting rotary vibration is transmitted to the hull structure through the shafting, the tail shaft bearing and other channels, so that the vibration sound radiation of the stern hull structure is induced. In addition, the working condition of the tail shaft bearing for supporting the outboard tail shaft is bad, the seawater is adopted for lubrication and cooling, the effects of heavy load, friction and vibration impact are born, the invasion of sediment, marine organisms, fishing nets and other foreign matters is likely to be faced, abnormal abrasion and rapid abrasion are extremely easy to occur, the tail shaft is sinking, the load distribution characteristic of a shaft system and the working condition of the tail shaft bearing are changed, and adverse effects are brought to the reliability of safe operation and long-term operation of the propulsion shaft system. Therefore, it is necessary to monitor the sinking amount and vibration of the outboard tail shaft of the ship on line.
The existing ship outboard tail shaft sinking amount and tail shaft bearing abrasion loss are generally measured under specific conditions by a manual method and a mechanical measuring instrument, so that the measurement convenience is poor and the on-line real-time monitoring cannot be realized; in addition, the existing ships lack monitoring means for the transverse vibration of the tail shaft outside the ship. The problems cause that the prior art and means can not meet the urgent requirements of high-end civil ships and professional ships on-line monitoring of the sinking amount of the outboard tail shaft, the abrasion loss of the bearing of the tail shaft and the transverse vibration of the tail shaft.
Disclosure of Invention
The invention aims to solve the technical problems that: the on-line monitoring method for the sinking amount and the vibration of the outboard tail shaft of the ship can monitor the sinking amount and the transverse vibration of the outboard tail shaft in real time on line during the navigation of the ship, has high measurement accuracy, and can improve the safety, the reliability and the economy of the navigation of the ship.
In order to solve the technical problems, the invention adopts the following technical scheme:
an on-line monitoring method for the sinking amount and the vibration of an outboard tail shaft of a ship is used for detecting the sinking amount and the transverse vibration of the tail shaft (5) of the ship, a propeller (1) of the ship is arranged at the tail end of the tail shaft (5), the tail shaft (5) is supported by a tail shaft front bearing (6) and a tail shaft rear bearing (4), the tail shaft front bearing (6) and the tail shaft rear bearing (4) are both arranged on a ship body structure (3) outside the ship, an outboard tail shaft sinking and vibration integrated measuring instrument (2) is arranged at the tail end of the tail shaft rear bearing (4), and a plurality of groups of displacement sensors are arranged inside the outboard tail shaft sinking and vibration integrated measuring instrument (2); the on-line monitoring method comprises an outboard tail shaft sinking amount measuring method and a vibration amount measuring method.
Further, five integrated eddy current displacement sensors are arranged in the outboard tail shaft sinking and vibration integrated measuring instrument (2), and are respectively: integral type eddy current displacement sensor 1# (7), integral type eddy current displacement sensor 2# (8), integral type eddy current displacement sensor 3# (9), integral type eddy current displacement sensor 4# (10), integral type eddy current displacement sensor 5# (11).
Specifically, the sinking amount measuring method comprises the following steps:
s1, in an initial installation state, recording detection values x1, x2, x3, x4 and x5 of five displacement sensors respectively, and determining the distance between the five displacement sensors and an initial axis Os of a tail shaft;
s2, after the operation time T, detecting values x1', x2', x3', x4', x5 'of the five displacement sensors are recorded again respectively, and the distances between the five displacement sensors and the actual axis Os' of the tail shaft are determined;
s3, solving the eccentricity e and the eccentric angle phi of the axis of the tail shaft;
s4, determining the circle center Ow of the abrasion circle at the bottom of the rear bearing according to the eccentricity e, the eccentric angle phi, the inner hole diameter R of the rear bearing and the diameter R of the tail shaft, and solving to obtain Os' Ow and OsOw;
s5, determining the relative position of the circle center Ow of the abrasion circle at the bottom of the rear bearing according to the Os' Ow, the OsOw and the eccentricity e;
s6, solving the abrasion loss of the rear bearing and the radius of the abrasion circle at the bottom according to the relative position of the circle center of the abrasion circle;
and S7, processing and calculating the monitoring values of a plurality of groups of different rotating speeds, and identifying the complete wear line type of the bearing.
Further, in step S1, the distances between the five displacement sensors and the initial axis Os of the tail shaft are respectively:
s1＝R-x1
s2＝R-x2
s3＝R-x3
s4＝R-x4
s5＝R-x5
wherein R is the diameter of the inner hole of the rear bearing.
Further, in step S2, the distances between the five displacement sensors and the actual axis Os' of the tail shaft are respectively:
s1”＝R-x1”
s2”＝R-x2”
s3”＝R-x3”
s4”＝R-x4”
s5”＝R-x5”
wherein R is the diameter of the inner hole of the rear bearing.
Further, in step S3, the eccentricity e and the eccentric angle Φ of the axial center of the tail shaft satisfy the following formula:
s″ n ＝R-x″ n (n＝1，2，…，5)
wherein R is the diameter of an inner hole of the rear bearing, R is the diameter of a tail shaft, and alpha is the included angle between symmetrically arranged sensors No. 2 and No. 4 and a central line.
Further, in step S5, the relative positions of the center Ow of the abrasion circle at the bottom of the rear bearing specifically include: and (3) the angle Os ' Ow, the angle Os ' A ' and the angle Os ' A, wherein A is a main measurement base point of the rear bearing in an initial state, and A ' is an auxiliary measurement base point of the rear shaft in the initial state.
Further, in step S6, the bearing wear amount is:
A’B’＝r-Os’A’
AB＝r-Os’A，
wherein B is a main measurement base point of the rear bearing in a wearing state, and B' is an auxiliary measurement base point of the rear shaft in the wearing state;
the bottom abrasion circle radius is: r '=r+owos'.
Further, the vibration quantity measuring method specifically comprises the steps of respectively monitoring vibration displacement X of the tail shaft along the direction of the sensor 1# (7) and vibration displacement Y of the tail shaft along the direction of the sensor 5# (11) through an integrated eddy current displacement sensor 1# (7) and an integrated eddy current displacement sensor 5# (11) which are symmetrically arranged at the upper half part of a tail shaft bearing (4), obtaining displacement spectrum curves of the two directions through Fourier transformation, and further obtaining a synthetic axis track and each harmonic axis track formed by vibration of the tail shaft (5).
Compared with the prior art, the invention has the following main advantages:
1. the on-line monitoring method for the sinking amount and vibration of the ship outboard tail shaft fills the blank of the on-line real-time monitoring means of the existing ship outboard tail shaft, can replace the traditional manual mechanical measuring method, and improves convenience and instantaneity;
2. the on-line monitoring method for the sinking amount and vibration of the ship outboard tail shaft realizes multifunctional integration and integration of abrasion loss, abrasion line type and transverse vibration monitoring of the tail shaft;
3. the on-line monitoring method for the sinking amount and the vibration of the outboard tail shaft of the ship has strong universality and good environmental adaptability, and can be applied to the fields of civil high-end ships and water-surface ships, underwater submarines and the like;
4. the on-line monitoring method for the sinking amount and vibration of the ship outboard tail shaft can provide an effective means for the ship to carry out preventive maintenance and also provide effective support for the intelligent monitoring, operation, management and the like of a ship propulsion system in the future.
Drawings
FIG. 1 is a schematic view of an on-line monitoring device according to an embodiment of the present invention;
FIG. 2 is a schematic view of the sensor layout inside the integrated outboard tail shaft sinking and vibrating meter in accordance with an embodiment of the invention;
FIG. 3 is a schematic illustration of the outboard tail shaft sinking measurement in an initial state in an embodiment of the invention;
FIG. 4 is a schematic diagram of the outboard tail shaft sag measurement in an ideal state of wear in an embodiment of the invention;
FIG. 5 is a schematic diagram of the outboard tail shaft sinking measurement in the actual state of wear in an embodiment of the invention;
fig. 6 is a schematic diagram of the measurement of the vibration quantity of the outboard tail shaft in the embodiment of the invention.
In the figure: 1. a propeller; 2. an outboard tail shaft sinking and vibrating integrated measuring instrument; 3. a hull structure; 4. tail shaft rear bearing (propeller bearing); 5. tail shaft (propeller shaft); 6. a tail shaft front bearing; 7. integrated eddy current displacement sensor 1#; 8. integrated eddy current displacement sensor 2#; 9. integrated eddy current displacement sensor 3#; 10. integrated eddy current displacement sensor 4#; 11. integrated eddy current displacement sensor 5#.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
It should be noted that each step/component described in the present application may be split into more steps/components, or two or more steps/components or part of the operations of the steps/components may be combined into new steps/components, as needed for implementation, to achieve the object of the present invention.
1. On-line monitoring device
As shown in fig. 1, a propeller 1 is mounted at the tail end of a tail shaft 5 of a ship propulsion system, and is generally supported by a tail shaft front bearing 6 and a tail shaft rear bearing 4 (also referred to as propeller bearings), and the tail shaft front bearing 6 and the tail shaft rear bearing 4 are mounted in a hull structure 3. In order to measure the sinking amount of the tail shaft 5 caused by abrasion of the rear bearing 6 of the tail shaft due to shafting operation, the invention provides an outboard tail shaft sinking and vibrating integrated measuring instrument 2 which is arranged at the tail end of the rear bearing 6 of the tail shaft, and the sinking amount of the outboard tail shaft 5 is monitored on line in real time. The monitoring signals are transmitted to a monitoring device host in the cabin through the pressure-resistant watertight cable so as to process the monitoring signals and display monitoring results.
As shown in fig. 2, five integrated eddy current displacement sensors (1 #, 2#, 3#, 4#, 5 #) are integrated inside the outboard tail shaft sinking and vibration integrated measuring instrument 2. The integrated eddy current displacement sensor 2# is arranged at the top and coincides with a theoretical center line in the vertical direction of an inner hole of the rear bearing 4 of the tail shaft, the integrated eddy current displacement sensor 3# and the integrated eddy current displacement sensor 4# are respectively arranged at the left side and the right side of the top of the integrated eddy current displacement sensor 2# and are symmetrically positioned, and an included angle alpha between each sensor and the center line is set to be within a range of 10-15 degrees; the integrated eddy current displacement sensor 1# and the integrated eddy current displacement sensor 5# are distributed on the upper half part of the measuring instrument and symmetrically arranged along the theoretical center line of the inner hole of the rear bearing of the tail shaft in the vertical direction, and an included angle beta between each sensor and the center line is set to be 45 degrees.
The five sensors are integrally packaged through the seawater-resistant engineering plastic shell integrally molded by casting, and resin is poured into the five sensors to realize pressure resistance.
The five sensors can be used for monitoring the sinking amount of the outboard tail shaft, wherein the two integrated eddy current displacement sensors (No. 1 and No. 5) are mainly used for monitoring the transverse vibration of the outboard tail shaft.
2. Outboard tail shaft sinking measurement
As shown in fig. 3, in the initial installation state, the tail shaft 5 is seated on the tail shaft rear bearing or the propeller bearing 4, the bottoms of the tail shaft and the propeller bearing are closely attached, the center of the tail shaft 5 is Os, the top clearance is delta, and the center distance of the tail shaft and the propeller bearing is delta/2. At this time, monitoring values of the upper integrated eddy current displacement sensors (1#, 2#, 3#, 4#, 5#) are x1, x2, x3, x4, x5, respectively, and the radius of the bearing inner hole is R, then the distances between each sensor site and the center Ob of the bearing inner hole are s1=r-x 1, s2=r-x 2, s3=r-x 3, s4=r-x 4, s5=r-x 5, respectively;
as shown in fig. 4, when the rear bearing 4 of the rear shaft is worn after a long period of operation T, if the wear pattern is an ideal bottom arc overall wear, the rear shaft 5 will generate a certain subsidence WD, the axial center of the rear shaft 5 changes from Os to Ow, at this time, the monitoring values of the upper five sensors change to x1', x2', x3', x4', x5', and the distances between the sensor sites and Ow are s1' =r-x 1', s2' =r-x 2', s3' =r-x 3', s4' =r-x 4', s5' =r-x 5', respectively, at this time, the wear amount of the rear bearing 4 of the rear shaft is equal to the subsidence amount of the rear shaft 5, and is also the axial center position change WD of the rear shaft 5, and is also the change in the monitoring value of the top integrated eddy current displacement sensor 3#, i.e., wd=ow-os=x3 ' -x3=s3-s 3'. For whether the abrasion form is generated, the difference between the integrated eddy current displacement sensors 1# and 5# and the difference between the integrated eddy current displacement sensors 2# and 4# can be judged.
As shown in fig. 5, for an actual ship, the wear pattern is generally not ideal wear, but is often a combination curve, which causes the tail shaft 5 not only to sink, but also to be horizontally offset to some extent. At this time, the axis of the tail shaft 5 moves from Os to Os', the eccentricity is e, the eccentric angle is phi, the included angles of the top 2#, 4# and 3# sensors are alpha, the sinking amount of the tail shaft 5 in the vertical direction is WD1, the maximum abrasion amount of the tail shaft rear bearing 4 at the bottommost part is WD2, the maximum abrasion amount of the tail shaft rear bearing 4 at the bottom bearing area is WD3, and the wd1 is not equal to wd2 not equal to WD3. At this time, the monitoring values of the upper integrated eddy current displacement sensors (1#, 2#, 3#, 4#, 5#) are x1', x2', x3', x4', x5', the radius of the inner hole of the bearing is R, the radius of the tail shaft is R, and the following relational expression is satisfied for each parameter:
s″ n ＝R-x″ n (n＝1，2，…，5)
by comparing (x 1", x 2") with (x 5", x 4"), the offset direction and the offset value of the tail shaft in the horizontal direction can be known. The eccentricity is e, the eccentric angle is phi, the diameter R of the inner hole of the bearing and the diameter R of the tail shaft can be obtained through solving the formula (note: the initial state, R and R can be used as known parameters; after a period of operation, R and R can be changed due to deformation and abrasion and can be used as variables, and the method is obtained through solving the formula).
The parameters of the eccentricity e, the eccentric angle phi, the bearing inner hole diameter R, the tail shaft diameter R and the like obtained by solving can be used for solving again to obtain Os' Ow and OsOw, so that the circle center Ow of the bottom worn circle after abrasion is determined; solving to obtain the < O > s 'Ow, < O s' A 'and < O > s' A according to the O 'Ow, the O' w and the eccentric distance e; and then according to the solved < Os ' A ', < Os ' A and the eccentricity e, solving to obtain Os ' A ', os ' A, and then the abrasion loss A ' B ' =r-Os ' A ', AB=r-Os ' A, and simultaneously identifying the bottom abrasion circle radius R ' =r+owOs '.
The complete wear line type of the bearing can be identified through solving and processing of multiple rotating speeds and multiple monitoring values.
3. Outboard tail shaft vibration measurement
As shown in fig. 6, the integrated eddy current displacement sensor 1# and the integrated eddy current displacement sensor 5# which are arranged at the upper half part of the tail shaft bearing 4 have included angles of 45 degrees with the vertical center line, so that vibration displacement monitoring in two directions can be performed simultaneously, and displacement spectrum curves in two directions can be obtained through fourier transformation, namely, a synthetic axis track formed by vibration of the tail shaft 5 and each harmonic axis track are obtained, so that the vibration characteristics of the outboard propeller-tail shaft-bearing system during operation, including parameters such as vibration displacement amplitude, characteristic frequency, axis track, axis center track of starting and stopping processes and the like, can be accurately mastered.
To sum up:
1. the on-line monitoring method for the sinking amount and vibration of the ship outboard tail shaft fills the blank of the on-line real-time monitoring means of the existing ship outboard tail shaft, can replace the traditional manual mechanical measuring method, and improves convenience and instantaneity;
2. the on-line monitoring method for the sinking amount and vibration of the ship outboard tail shaft realizes multifunctional integration and integration of abrasion loss, abrasion line type and transverse vibration monitoring of the tail shaft;
3. the on-line monitoring method for the sinking amount and the vibration of the outboard tail shaft of the ship has strong universality and good environmental adaptability, and can be applied to the fields of civil high-end ships and water-surface ships, underwater submarines and the like;
4. the on-line monitoring method for the sinking amount and vibration of the ship outboard tail shaft can provide an effective means for the ship to carry out preventive maintenance and also provide effective support for the intelligent monitoring, operation, management and the like of a ship propulsion system in the future.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The utility model provides a ship outboard tail shaft subsidence and vibration on-line monitoring method for detect the subsidence and the horizontal vibration of boats and ships tail shaft (5), screw (1) of boats and ships are installed in the tail end of tail shaft (5), tail shaft (5) are supported by tail shaft front bearing (6) and tail shaft rear bearing (4), tail shaft front bearing (6) and tail shaft rear bearing (4) are all installed on the hull structure (3) of boats and ships outboard, its characterized in that: an outboard tail shaft sinking and vibrating integrated measuring instrument (2) is arranged at the tail end of the tail shaft rear bearing (4), and a plurality of groups of displacement sensors are arranged inside the outboard tail shaft sinking and vibrating integrated measuring instrument (2); the on-line monitoring method comprises an outboard tail shaft sinking amount measuring method and a vibration amount measuring method.
2. The on-line monitoring method for the sinking and vibration of the outboard tail shaft of the ship according to claim 1, wherein the method comprises the following steps: five integrated eddy current displacement sensors are arranged in the outboard tail shaft sinking and vibration integrated measuring instrument (2), and are respectively: integral type eddy current displacement sensor 1# (7), integral type eddy current displacement sensor 2# (8), integral type eddy current displacement sensor 3# (9), integral type eddy current displacement sensor 4# (10), integral type eddy current displacement sensor 5# (11).
3. The on-line monitoring method for the sinking and vibration of the outboard tail shaft of the ship according to claim 2, wherein the method comprises the following steps: the sinking amount measuring method comprises the following steps:
s1, in an initial installation state, recording detection values x1, x2, x3, x4 and x5 of five displacement sensors respectively, and determining the distance between the five displacement sensors and an initial axis Os of a tail shaft;
s2, after the operation time T, detecting values x1', x2', x3', x4', x5 'of the five displacement sensors are recorded again respectively, and the distances between the five displacement sensors and the actual axis Os' of the tail shaft are determined;
s3, solving the eccentricity e and the eccentric angle phi of the axis of the tail shaft;
s4, determining the circle center Ow of the abrasion circle at the bottom of the rear bearing according to the eccentricity e, the eccentric angle phi, the inner hole diameter R of the rear bearing and the diameter R of the tail shaft, and solving to obtain Os' Ow and OsOw;
s5, determining the relative position of the circle center Ow of the abrasion circle at the bottom of the rear bearing according to the Os' Ow, the OsOw and the eccentricity e;
s6, solving the abrasion loss of the rear bearing and the radius of the abrasion circle at the bottom according to the relative position of the circle center of the abrasion circle;
and S7, processing and calculating the monitoring values of a plurality of groups of different rotating speeds, and identifying the complete wear line type of the bearing.
4. The on-line monitoring method for the sinking amount and vibration of the outboard tail shaft of a ship according to claim 3, wherein in the step S1, the distances between the five displacement sensors and the initial axis Os of the tail shaft are respectively:
s1＝R-x1
s2＝R-x2
s3＝R-x3
s4＝R-x4
s5＝R-x5
wherein R is the diameter of the inner hole of the rear bearing.
5. The on-line monitoring method for the sinking amount and vibration of the outboard tail shaft of a ship according to claim 3, wherein in the step S2, the distances between the five displacement sensors and the actual shaft center Os' of the tail shaft are respectively:
s1”＝R-x1”
s2”＝R-x2”
s3”＝R-x3”
s4”＝R-x4”
s5”＝R-x5”
wherein R is the diameter of the inner hole of the rear bearing.
6. The on-line monitoring method for the sinking amount and vibration of the outboard tail shaft of a ship according to claim 3, wherein in the step S3, the eccentricity e and the eccentric angle phi of the axis of the tail shaft satisfy the following formula:
s″ n ＝R-x″ n (n＝1，2，…，5)
wherein R is the diameter of an inner hole of the rear bearing, R is the diameter of a tail shaft, and alpha is the included angle between symmetrically arranged sensors No. 2 and No. 4 and a central line.
7. The on-line monitoring method for the sinking amount and vibration of the outboard tail shaft of a ship according to claim 3, wherein in step S5, the relative position of the center Ow of the abrasion circle at the bottom of the rear bearing specifically includes: and (3) the angle Os ' Ow, the angle Os ' A ' and the angle Os ' A, wherein A is a main measurement base point of the rear bearing in an initial state, and A ' is an auxiliary measurement base point of the rear shaft in the initial state.
8. The on-line monitoring method for the sinking amount and vibration of the outboard tail shaft of a ship according to claim 3, wherein in step S6, the bearing wear amount is:
A’B’＝r-Os’A’
AB＝r-Os’A，
wherein B is a main measurement base point of the rear bearing in a wearing state, and B' is an auxiliary measurement base point of the rear shaft in the wearing state;
the bottom abrasion circle radius is: r '=r+owos'.
9. The on-line monitoring method for the sinking and vibration of the outboard tail shaft of the ship according to claim 2, wherein the method comprises the following steps: the vibration quantity measuring method specifically comprises the steps of respectively monitoring vibration displacement X of a tail shaft along the direction of a sensor 1# (7) and vibration displacement Y of the tail shaft along the direction of a sensor 5# (11) through integrated eddy current displacement sensors 1# (7) and integrated eddy current displacement sensors 5# (11) which are symmetrically arranged at the upper half part of a tail shaft bearing (4), obtaining displacement frequency spectrum curves of the two directions through Fourier transformation, and further obtaining a synthetic axis track and each harmonic axis track formed by vibration of the tail shaft (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211498472.5A CN116443215A (en) | 2022-11-28 | 2022-11-28 | Online monitoring method for sinking amount and vibration of ship outboard tail shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211498472.5A CN116443215A (en) | 2022-11-28 | 2022-11-28 | Online monitoring method for sinking amount and vibration of ship outboard tail shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116443215A true CN116443215A (en) | 2023-07-18 |
Family
ID=87124399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211498472.5A Pending CN116443215A (en) | 2022-11-28 | 2022-11-28 | Online monitoring method for sinking amount and vibration of ship outboard tail shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116443215A (en) |
-
2022
- 2022-11-28 CN CN202211498472.5A patent/CN116443215A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102332849B1 (en) | Bearing for supporting a shaft, in particular a rudder shaft, or a rudder blade, electronic bearing clearance measuring device, rudder comprising a bearing for supporting a shaft or a rudder blade, and method for measuring wear of a bearing for supporting a shaft or a rudder blade | |
| CA2718873C (en) | Arrangement for determining a force acting on a rudder | |
| Lee | Application of strain gauge method for investigating influence of ship shaft movement by hydrodynamic propeller forces on shaft alignment | |
| US11447225B2 (en) | Rudder for watercraft with a bearing clearance measuring device, method for measurement of a bearing clearance in a rudder and bearing clearance measuring device for a rudder | |
| Vartdal et al. | Lateral propeller forces and their effects on shaft bearings | |
| KR101078426B1 (en) | Azimuth self propulsion dynamometer for towing tank test | |
| CN110877670A (en) | Disconnected axle formula segmentation self-navigation model of boats and ships water elasticity test | |
| CN116443215A (en) | Online monitoring method for sinking amount and vibration of ship outboard tail shaft | |
| CN204405513U (en) | For the device of low-speed heave-load water lubriucated bearing friction coefficient measurement | |
| CN112034202B (en) | Wind speed and direction sensor and method for kilometric ocean wind energy unmanned aircraft | |
| CN217442492U (en) | Monitoring system for ship bearing position and posture | |
| Mann | Shipyard alignment of propulsion shafting using fair curve alignment theory | |
| CN115371621A (en) | Fixed type amplitude-variable boom crane ship superelevation measurement alarm device and method | |
| CN115593588A (en) | Ship outboard tail shaft sinking amount and vibration online monitoring device | |
| CN214112822U (en) | Ship propeller looseness early warning and monitoring system | |
| Murawski | The influence of shaft line alignment accuracy on the operational reliability of marine propulsion systems | |
| MIGALI | Full-scale propulsion measurements on a planing pleasure yacht in head sea | |
| KR20150066007A (en) | Rudder carrier assembly for a ship and the ship having it | |
| Dashnaw et al. | Propeller strain measurements and vibration measurements on the SS Michigan | |
| Mambetov et al. | Improving the reliability and stability of the sleeve bearing units | |
| CN215588405U (en) | Variable pump power head and gear box centering device structure | |
| CN106428416A (en) | Method for improving rotating speed allowance by cutting and modifying propeller | |
| CN111674538B (en) | Bamboo raft power assembly | |
| CN211009877U (en) | Sealing device | |
| CN116923681A (en) | Rudder system attachment structure, detection method and design method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |