CN110435837A - A method of avoid mild steel arm and floating production storage tanker stem from colliding - Google Patents
A method of avoid mild steel arm and floating production storage tanker stem from colliding Download PDFInfo
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- CN110435837A CN110435837A CN201910677279.XA CN201910677279A CN110435837A CN 110435837 A CN110435837 A CN 110435837A CN 201910677279 A CN201910677279 A CN 201910677279A CN 110435837 A CN110435837 A CN 110435837A
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- China
- Prior art keywords
- mild steel
- steel arm
- arm
- inclination angle
- pendulum
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B2021/203—Mooring cables or ropes, hawsers, or the like; Adaptations thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/448—Floating hydrocarbon production vessels, e.g. Floating Production Storage and Offloading vessels [FPSO]
Abstract
A method of it avoids mild steel arm and floating production storage tanker stem from colliding, the mooring leg and mild steel arm connected by mooring bracket while can also generate horizontal swing；Using swing, the principle of dissipation of vibrations energy, to reduce the horizontal swing of mild steel arm；Single pendulum is placed in the lower section of two end arms end floating drum of mild steel arm, the right and left each one, when mild steel arm and FPSO, which generate resonance, to be swung laterally, energy can be dissipated by being arranged in two single pendulums below mild steel arm floating drum, the horizontal swing of mild steel arm can be mitigated in this way, the horizontal swing amplitude for reducing mild steel arm avoids colliding with FPSO stem；The chain length of each single pendulum is controllable, its chain length can be adjusted according to the posture situation of mild steel arm, the further position for determining medicine ball.The advantage of doing so is that being directed to different situations, changes the torque of single pendulum by changing chain length, increase the control to mild steel arm swing, play a role to the full extent.
Description
Technical field
The invention belongs to outer turret single point anchoring system control technology field, in particular to one kind avoids mild steel arm and floating
The method for producing the collision of oil storage ship stem.
Background technique
Floating Storage Unloading Device (Floating Production Storage and Offloading, FPSO) is alive
Boundary's marine petroleum development is widely applied.FPSO itself usually relies on anchoring system and guarantees as positioning device without dynamical system
FPSO has good vane effect in a certain fixed area operation.
The resonance of soft rigid arm can all occur, under mild sea situation or severe sea condition environment either so as to cause soft rigid arm
The sideway of the soft rigid arm of substantially sideway the functional domain of structure can be caused to fail, such as: the pressure of stem Yu soft rigid arm mooring structure can be made
It carries and collides between cabin and FPSO stem is caused to rupture；In addition, mild steel arm sideway can generate limit to the personnel of passing soft rigid arm
System, and be coupled with ship motion and lead to some unknown risks.Research shows that generating acutely opposite fortune between oil carrier and YOKE
Dynamic reason is mainly since oscillator system 6.8s natural vibration period that hangs of mild steel arm and YOKE arm end floating drum composition is subject to oil carrier
It is very close to be similar to wave forced excitation period 7s of simple harmonic motion or so, thus has caused resonance effects.
Summary of the invention
In view of the problems of the existing technology, the present invention provides one kind mild steel arm is avoided to touch with floating production storage tanker stem
The method hit, the mooring leg connected by mooring bracket and mild steel arm while it can also generate side swinging motion；Utilize swing, vibration
The principle of dynamic dissipation energy, to reduce the horizontal swing of mild steel arm；Single pendulum is placed in the lower section of two end arms end floating drum of mild steel arm, left and right
Each one of both sides, when mild steel arm and FPSO generation resonate when swinging laterally, energy can be by being arranged under mild steel arm floating drum
Two single pendulums of side dissipate, and can mitigate the horizontal swing of mild steel arm in this way, reduce the horizontal swing amplitude of mild steel arm, avoid with
The collision of FPSO stem；The chain length of each single pendulum is controllable, its chain length can be adjusted according to the posture situation of mild steel arm, further
Determine the position of medicine ball.The advantage of doing so is that being directed to different situations, changes the torque of single pendulum by changing chain length, add
Greatly to the control of mild steel arm swing, play a role to the full extent.
A method of avoid mild steel arm and floating production storage tanker stem from colliding, specific process is as follows:
Step 1: in outer turret single point anchoring system, mild steel arm configuration the right and left respectively has a floating drum, and two amounts of decrease of setting put position
In the underface of two floating drums, as shown in Figure 1.Amount of decrease pendulum is made of solid steel ball and cable wire, and hoist engine is connected solid by cable wire
Steel ball, further control connects the cable wire chain length of solid steel ball to control the position of solid steel ball；PC control hoist engine
Working order, according to the posture of mild steel arm come folding and unfolding cable wire, so that solid steel ball reaches designated position；The steel chain of two amounts of decrease pendulum
The sum of length should be less than the lateral distance for being equal to mild steel arm or so two floating drums, and the purpose being arranged in this way is that two amounts of decrease is avoided to put phase
It hits or is intertwined；
Step 2: FPSO mild steel arm single point mooring's attitude monitoring system is measured by installing on hull, mooring leg and mild steel arm
Sensor acquires ocean environmental loads, mild steel arm athletic posture and mooring structure strain measurement data in real time；
(1) due to wanting the side swinging motion of mild steel arm configuration in turret single point anchoring system outside active control, original FPSO
Mild steel arm single point mooring's attitude monitoring system installs four inclination angle sensings on two strings of left and right mooring leg and soft rigid arm support or so
Device directly acquires the initial data detected, respectively inclination angle 1, inclination angle 2,3 and of inclination angle from this four obliquity sensors first
Inclination angle 4；
(2) operating of control hoist engine is not used directly for from the initial data that obliquity sensor obtains mild steel arm, it is upper
Machine needs that these information should be screened, classify, extract and be calculated；
As shown in Fig. 2, initial data can be divided into two groups of Y1(2) and Y3(4), the inclination angle of mild steel arm horizontal swing, which uses, asks flat as follows
The algorithm of mean value:
(3) by the equivalent pendulum length l=13m and maximum pendulum angle θ of mild steel armm=20 ° are brought into following formula calculating, and it is lateral to obtain mild steel arm
The period of swing is about 7s；
Thus host computer acquire from four obliquity sensors the frequencies of data at interval of 0.3s from FPSO mild steel arm single-point system
Moor the initial data of obliquity sensor the acquisition mooring leg and mild steel arm inclination angle of attitude monitoring system；
Step 3: host computer acquires initial data at interval of 0.3s from obliquity sensor, obtains mild steel after overcoupling calculates
The inclination angle of arm controls hoist engine according to the size at its inclination angle, respectively the cable wire of two amount of decrease of folding and unfolding pendulum, so that solid rigid ball reaches
Specified position carries out vibration damping.
By the cable wire chain length of control two amounts of decrease pendulum, so that the torque of mild steel arm the right and left of FPSO single point mooring system
It is different.If posture is the state of right low left high, just controls the steel on the left side when mild steel arm horizontal swing of FPSO single point mooring system
Rope chain is longer than the right, so that the shaking moment on the left side is greater than the shaking moment on the right；If right high left low state, then feelings
Condition is on the contrary, the final purpose done so is the feelings for avoiding being caused to collide with FPSO stem by the horizontal swing that mild steel arm generates
Condition.The swaying movement regularity of mild steel arm can also be learnt by host computer, can periodically change cable wire chain length according to this its characteristics of motion,
To slow down the horizontal swing amplitude of the mild steel arm in single point mooring system.
The present invention is to pass through two amount of decrease of left and right immediately below control mild steel arm floating drum when mild steel arm resonates with FPSO
The cable wire chain length of pendulum enables the mild steel arm immediate stability in anchoring system to get off, ensure that the normal of single point mooring system
Work, while the working efficiency of oil platform is also improved, security performance obtains effective guarantee.
Detailed description of the invention
Fig. 1 is the schematic diagram for the amount of decrease pendulum position that the invention patent provides；
Fig. 2 is the flow chart that the host computer that the invention patent provides resolves inclination angle initial data；
Fig. 3 is the flow chart for the control mild steel arm resonance method that the invention patent provides.
In figure: 1, FPSO；2, floating drum；3, cable wire；4, solid steel ball.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
A method of avoid mild steel arm and floating production storage tanker stem from colliding, the mooring leg connected by mooring bracket
Side swinging motion can be also generated simultaneously with mild steel arm；Using swing, the principle of dissipation of vibrations energy, to reduce the cross of mild steel arm
To swing；Single pendulum is placed in the lower section of two end arms end floating drum of mild steel arm, the right and left each one, resonates when mild steel arm is generated with FPSO
When swinging laterally, energy can be dissipated by being arranged in two single pendulums below mild steel arm floating drum, can mitigate mild steel in this way
The horizontal swing of arm reduces the horizontal swing amplitude of mild steel arm, avoids colliding with FPSO stem；The chain length of each single pendulum is controllable,
Its chain length can be adjusted according to the posture situation of mild steel arm, the further position for determining solid steel ball.The benefit done so
It is to change the torque of single pendulum by changing chain length for different situations, increases the control to mild steel arm swing, it is maximum
It plays a role in degree.
A method of avoid mild steel arm and floating production storage tanker stem from colliding, specific process is as follows:
Step 1: in outer turret single point anchoring system, mild steel arm configuration the right and left respectively has a floating drum 2, and two amounts of decrease of setting are put
Positioned at the underface of two floating drums 2, as shown in Figure 1.Amount of decrease pendulum is made of solid steel ball 4 and cable wire 3, and hoist engine is connected by cable wire 3
Solid steel ball 4 is connect, further control connects 3 chain length of cable wire of solid steel ball 4 to control the position of solid steel ball 4；Host computer control
The working order of hoist engine processed, according to the posture of mild steel arm come folding and unfolding cable wire 3, so that solid steel ball 4 reaches designated position；Two subtract
The sum of the 3 chain length length of cable wire of width pendulum should be less than the lateral distance for being equal to mild steel arm or so two floating drums 2, and the purpose being arranged in this way is
Two amounts of decrease pendulum is avoided to bump against or be intertwined；
Step 2: FPSO1 mild steel arm single point mooring's attitude monitoring system is measured by installing on hull, mooring leg and mild steel arm
Sensor acquires the data such as ocean environmental loads, mild steel arm athletic posture and mooring structure strain measurement in real time；
Step 1: the side swinging motion due to wanting mild steel arm configuration in turret single point anchoring system outside active control, original
FPSO1 mild steel arm single point mooring's attitude monitoring system installs four inclination angles on two strings of left and right mooring leg and soft rigid arm support or so
Sensor, directly acquires the initial data detected from this four obliquity sensors first, respectively inclination angle 1, inclination angle 2, incline
Angle 3 and inclination angle 4；
Step 2: the operating of control hoist engine is not used directly for from the initial data that obliquity sensor obtains mild steel arm,
Host computer needs that these information should be screened, classify, extract and be calculated；
Host computer resolves as shown in Fig. 2, the inclination angle of mild steel arm horizontal swing uses and asks flat as follows the specific of these initial data
The algorithm of mean value:
Step 3: by the equivalent pendulum length l=13m and maximum pendulum angle θ of mild steel armm=20 ° are brought into following formula calculating, obtain mild steel arm
The period of horizontal swing is about 7s；
Thus host computer acquire from four obliquity sensors the frequencies of data at interval of 0.3s from FPSO1 mild steel arm single-point system
Moor the initial data of obliquity sensor the acquisition mooring leg and mild steel arm inclination angle of attitude monitoring system；
Step 3: host computer acquires initial data at interval of 0.3s from obliquity sensor, obtains mild steel after overcoupling calculates
The inclination angle of arm controls hoist engine according to the size at its inclination angle, respectively the cable wire of two amount of decrease of folding and unfolding pendulum, so that solid steel ball 4 arrives
Vibration damping is carried out up to specified position.
By the cable wire chain length of control two amounts of decrease pendulum, so that the power of mild steel arm the right and left of FPSO1 single point mooring system
Square is different.If posture is the state of right low left high, just controls the left side when mild steel arm horizontal swing of FPSO1 single point mooring system
3 chain of cable wire be longer than the right so that the shaking moment on the left side be greater than the right shaking moment；If right high left low state,
So situation is on the contrary, the final purpose done so is to avoid causing to touch with FPSO1 stem by the horizontal swing that mild steel arm generates
The case where hitting.The swaying movement regularity of mild steel arm can also be learnt by host computer, it can be according to this its characteristics of motion, periodically change cable wire
Chain length, to slow down the horizontal swing amplitude of the mild steel arm in single point mooring system.
The present invention is to pass through two amount of decrease of left and right immediately below control mild steel arm floating drum when mild steel arm resonates with FPSO
The cable wire chain length of pendulum enables the mild steel arm immediate stability in anchoring system to get off, ensure that the normal of single point mooring system
Work, while the working efficiency of oil platform is also improved, security performance obtains effective guarantee.
Claims (2)
1. a kind of method for avoiding mild steel arm and floating production storage tanker stem from colliding, it is characterised in that: specific process is as follows:
Step 1: in outer turret single point anchoring system, mild steel arm configuration the right and left respectively has a floating drum, and two amounts of decrease of setting put position
In the underface of two floating drums, amount of decrease pendulum is made of solid steel ball and cable wire, and hoist engine connects solid steel ball by cable wire, further
Control connects the cable wire chain length of solid steel ball to control the position of solid steel ball；The working order of PC control hoist engine, root
Carry out folding and unfolding cable wire according to the posture of mild steel arm, so that solid steel ball reaches designated position；The sum of the cable wire chain length length of two amounts of decrease pendulum
It should be less than the lateral distance for being equal to mild steel arm or so two floating drums, the purpose being arranged in this way is that two amounts of decrease pendulum is avoided to bump against or wind
Together；
Step 2: FPSO mild steel arm single point mooring's attitude monitoring system is measured by installing on hull, mooring leg and mild steel arm
Sensor acquires ocean environmental loads, mild steel arm athletic posture and mooring structure strain measurement data in real time；
Step 3: host computer acquires initial data at interval of 0.3s from obliquity sensor, obtains mild steel after overcoupling calculates
The inclination angle of arm controls hoist engine according to the size at its inclination angle, respectively the cable wire of two amount of decrease of folding and unfolding pendulum, so that solid rigid ball reaches
Specified position carries out vibration damping.
2. a kind of method for avoiding mild steel arm and floating production storage tanker stem from colliding, feature exist according to claim 1
In: step 2 specifically:
(1) due to wanting the side swinging motion of mild steel arm configuration in turret single point anchoring system outside active control, original FPSO
Mild steel arm single point mooring's attitude monitoring system installs four inclination angle sensings on two strings of left and right mooring leg and soft rigid arm support or so
Device directly acquires the initial data detected, respectively inclination angle 1, inclination angle 2,3 and of inclination angle from this four obliquity sensors first
Inclination angle 4；
(2) operating of control hoist engine is not used directly for from the initial data that obliquity sensor obtains mild steel arm, it is upper
Machine needs that these information should be screened, classify, extract and be calculated；
Initial data can be divided into two groups of Y1(2) and Y3(4), the inclination angle of mild steel arm horizontal swing is using the calculation averaged as follows
Method:
(3) by the equivalent pendulum length l=13m and maximum pendulum angle θ of mild steel armm=20 ° are brought into following formula calculating, and it is lateral to obtain mild steel arm
The period of swing is about 7s；
Thus host computer acquire from four obliquity sensors the frequencies of data at interval of 0.3s from FPSO mild steel arm single-point system
Moor the initial data of obliquity sensor the acquisition mooring leg and mild steel arm inclination angle of attitude monitoring system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910677279.XA CN110435837A (en) | 2019-07-25 | 2019-07-25 | A method of avoid mild steel arm and floating production storage tanker stem from colliding |
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| CN201910677279.XA CN110435837A (en) | 2019-07-25 | 2019-07-25 | A method of avoid mild steel arm and floating production storage tanker stem from colliding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111891310A (en) * | 2020-07-01 | 2020-11-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Surging motion suppression device for ship |
| CN114291209A (en) * | 2021-12-31 | 2022-04-08 | 中国船舶重工集团公司第七一九研究所 | Adjustable-stiffness transverse damper, mooring device, system and method |
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| CN111891310A (en) * | 2020-07-01 | 2020-11-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Surging motion suppression device for ship |
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| CN114291209A (en) * | 2021-12-31 | 2022-04-08 | 中国船舶重工集团公司第七一九研究所 | Adjustable-stiffness transverse damper, mooring device, system and method |
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Application publication date: 20191112 |