CN105279322A - Method for calculating stern docking block support reaction of undocking ship - Google Patents
Method for calculating stern docking block support reaction of undocking ship Download PDFInfo
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- CN105279322A CN105279322A CN201510653726.XA CN201510653726A CN105279322A CN 105279322 A CN105279322 A CN 105279322A CN 201510653726 A CN201510653726 A CN 201510653726A CN 105279322 A CN105279322 A CN 105279322A
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Abstract
The invention discloses a method for calculating a stern docking block support reaction of an undocking ship. The method comprises the following steps: (1) carrying out stress analysis on the undocking ship according to three stages, namely before bow floating, bow floating and stern floating, establishing a mathematical model, and quantitatively analyzing a basic law of change of the stern docking block support reaction with external draft; (2) determining influence factors which influence the stern docking block support reaction, and analyzing the influence degrees of the influence factors: stern inclination angle > longitudinal stability height > displacement > floatation center position; (3) calculating a maximum value of the stern docking block support reaction, and correcting the correctness of the calculation result; and (4) drawing a fitting curve to obtain change conditions of the stern docking block support reaction in an entire undocking floatation process. The calculation method can be not only used for calculating the maximum value of the stern docking block support reaction, but also can be used for calculating the stern docking block support reaction in the entire undocking floatation process and drawing the fitting curve of the change of the stern docking block support reaction with the draft, so as to serve as a technical base of safety production.
Description
Technical field
The present invention relates to a kind of computing method of the ship stern docking block support reaction that undocks.
Background technology
Spot ship statics formula cannot calculate the stern docking block support reaction of floating process, more cannot calculate floating ship stern end docking block support reaction maximal value, and the stern end docking block support reaction of boats and ships floating any instant, also can not form the stern end docking block support reaction matched curve of ship undocking floating overall process.
Summary of the invention
The technical problem to be solved in the present invention overcomes the defect that existing Ship Statics formula cannot calculate the stern docking block support reaction of floating process, and provide a kind of computing method of the ship stern docking block support reaction that undocks.Described computing method not only can calculate support reaction maximal value, can also calculate the support reaction of floating overall process of undocking, and make the matched curve of support reaction with drinking water change, as the technical basis of safety in production.
The invention provides a kind of computing method of the ship stern docking block support reaction that undocks, its feature is, described computing method comprise the steps:
(1) according to stem float before, stem float, ship stern floating three phases, to undocking, floating boats and ships carry out force analysis, founding mathematical models, quantitative test stern docking block support reaction with outside drinking water change basic law;
(2) determine the influence factor affecting stern docking block support reaction, analyze the influence degree drawing each influence factor: > pitch metacentric stability height > water discharge > centre of floatation position, stern inclination angle;
(3) maximal value of stern docking block support reaction is calculated, and the correctness of calculation and check result;
(4) draw matched curve, obtain the situation of change of ship undocking floating overall process stern docking block support reaction.
Preferably, in step (1), the foundation of mathematical model is based on equilibrium of forces principle: gravity G, buoyancy B, stern docking block support reaction Σ R balance each other,
gravity is to the moment M of stern end points O
gwith buoyancy torque M
b, stern docking block support reaction moment M
rbalance each other, M
r+ M
b=M
g.
Preferably, in stem floating-upward process, stern docking block support reaction reaches maximal value; In ship stern floating-upward process, stern docking block support reaction is 0.
Preferably, in step (3), the correctness of calculation and check result is analyzed using floating of undocking as the inverse process of the pier that lies up.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains the preferred embodiments of the invention.
Positive progressive effect of the present invention is: the present invention is on the basis of principle of naval architecture, to be rigid body depending on the floating boats and ships that undock, according to force and moment equilibrium principle, force analysis is carried out to its motion state, propose a kind of computing method of the ship stern docking block support reaction that undocks, not only can calculate the maximal value of stern docking block support reaction, the stern docking block support reaction in all floating stages can also be calculated.Computing method of the present invention compensate for the deficiency of spot ship statics docking block Force Calculation formula, have saved expense and the time of finite element method, and result of calculation is applicable to boats and ships actual production building course.
Accompanying drawing explanation
Fig. 1 is the force analysis schematic diagram of the floating boats and ships of the embodiment of the present invention 1.
Fig. 2 is the matched curve figure between the stern docking block support reaction of the embodiment of the present invention 1 and Mean Draught.
Embodiment
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
The computing method of what the present embodiment provided undock ship stern docking block support reaction are as follows:
(1) undock boats and ships force analysis
To undock the stressing conditions of boats and ships in each stage of floating based on rigid model analysis, with founding mathematical models.Force analysis in boats and ships floating of undocking process can be divided into stem float before, stem float, ship stern floating three phases, carry out computational analysis for certain ship type below:
A. before stem floats
Before stem floats, boats and ships force analysis as shown in Figure 1, ignores the impact of current and wind, and boats and ships are only subject to gravity, buoyancy and the acting in conjunction of docking block support reaction, are still on docking block.
The weight of boats and ships, center of gravity are definite value, and buoyancy can be regarded as the function of drinking water.Along with dock adds river, in depressed place, water level constantly rises, and the drinking water of boats and ships increases, and buoyancy also increases thereupon, does not have no progeny and move in centre of buoyancy.According to equilibrium of forces principle:
ΣM＝0(2)
Gravity G, buoyancy B, docking block support reaction Σ R balance each other, and obtain formula (3) by formula (1)
Gravity is to the moment M of stern end points O
gwith buoyancy torque M
b, support reaction moment M
rbalance each other, obtained by formula (2)
M
R+M
B＝M
G(4)
Before stem starts floating, the time of experience is one the longest in floating motion process three phases, from dock, open a sluice gate to add water to water level in depressed place reach about 6m, the feature in this stage is that boats and ships remain stationary state, and the docking block support reaction of hull bottom substantially linearly reduces.Along with drinking water constantly increases, as buoyancy torque M
bbe greater than gravity torque M
g, when namely drinking water is for 4.182m, boats and ships start slowly to rotate around stern end points O, and bow will leave the support of docking block, slowly float gradually.
B. boats and ships bow floats
Owing to undocking, boats and ships incline with certain stern, when buoyancy is increased to certain numerical value, and buoyancy moment M
bbe greater than gravitational torque M
g, boats and ships terminate horizontal stationary state, start to float gradually around hull bottom stern end points O, and this process can be regarded as hull and rotates around stern end strong point O.
Hull is around in stern end strong point O rotation process, and the size of buoyancy and centre of buoyancy continue increase along with drinking water and constantly change.This phase duration is relatively short, and support reaction ∑ R is provided by ship stern O point region, can in the hope of support reaction ∑ R according to formula (3) and formula (4).According to calculating data, now the support reaction ∑ R of stern O point reaches maximal value, i.e. ∑ R
mAX=1515t.
C. ship stern floats
In this stage, along with ship stern floats, this hull have left the support of docking block completely.Ignore the impact of external wind, wave, stream, boats and ships this moment are only subject to the effect of self gravitation and river buoyancy, and buoyancy equals gravity, centre of buoyancy and center of gravity on same pedal line, docking block support reaction R
o=0.
(2) stern end support reaction influence factor is determined
The factor affecting hull bottom stern end support reaction has four, i.e. high, the stern inclination angle of water discharge, pitch metacentric stability and centre of floatation position, orthogonal experiment is adopted to carry out Simplified analysis, calculated by the extreme difference of each factor, can obtain that water discharge, pitch metacentric stability are high, stern inclination angle, centre of floatation position is to the influence degree of stern end support reaction, the influence degree calculated according to extreme difference carries out primary and secondary sequence, and result is as follows: > pitch metacentric stability height > water discharge > centre of floatation position, stern inclination angle.
(3) stern end support reaction maximal value
Before bow floats, the docking block support reaction ∑ R that makes a concerted effort is provided jointly by all docking blocks of hull bottom.When bow starts to float, although this support reaction is made a concerted effort, change is little, and stress area has but focused on ship stern end regions gradually.Stem starts the moment of floating, and ship stern region and stern docking block all will be subject to the effect of a power instantaneously, and these two power are relations of acting force and reacting force, so the equal and opposite in direction of power.By theoretical mechanics knowledge, the maximal value of docking block support reaction is by fulcrum, and namely docking block provides, and now docking block will bear the pressure of 1515t.
According to Ship Statics principle, floating of undocking regards the inverse process of the pier that lies up as.The pier process that lies up can be similar to regards the motion of stern careenage oceangoing ship around its Water Plane centre of floatation as, and the relevant knowledge that the pier counter-force that falls maximal value also can apply hydrostatic power and intact stability solves, the maximal value of stern docking block support reaction R during Ship ' floating.
Formula (5) is used to calculate, ∑ R
mAX=1571t, the result of calculation of same formula (3) and formula (4) is close, and this method solves the correctness of docking block support reaction maximal value by Ship Statics knowledge verification.
(4) stern end support reaction matched curve
By the support reaction R that difference drinking water is corresponding
o, the matched curve that stern region support reaction changes with Mean Draught can be drawn, intuitively arrive support reaction R
ochanging Pattern.The horizontal ordinate of curve is Mean Draught, and unit is rice, and ordinate is support reaction R
o, unit is ton, sees Fig. 2.
Be can visually see by Fig. 2, when boats and ships start to rotate the moment of floating around stern end points, the support reaction in stern region increases suddenly, and reaches rapidly a maximal value, and this support reaction maximal value is a very large test to docking block intensity and hull bottom structural strength.Meanwhile, as seen from Figure 2, with the increase of drinking water, this support reaction, after reaching maximal value suddenly, is decreased to zero rapidly.By matched curve, boats and ships can be obtained and rotate the stern end support reaction R under absorbing water arbitrarily in floating-upward process around stern end points O
o.
To sum up, computing method of the present invention not only can calculate floating ship stern end docking block support reaction maximal value, the stern end docking block support reaction of all right Ship ' floating any instant, the matched curve of stern end docking block support reaction with drinking water change of ship undocking floating overall process can be formed by the stern docking block support reaction numerical value in each moment, as one of technical basis that shipyard is kept the safety in production, this is that spot ship statics formula is imponderable.This method compensate for the deficiency of spot ship statics docking block Force Calculation formula, has saved expense and the time of finite element method, and result of calculation is applicable to boats and ships actual production building course.
Claims (4)
1. undock the computing method of ship stern docking block support reaction, it is characterized in that, described computing method comprise the steps:
(1) according to stem float before, stem float, ship stern floating three phases, to undocking, floating boats and ships carry out force analysis, founding mathematical models, quantitative test stern docking block support reaction with outside drinking water change basic law;
(2) determine the influence factor affecting stern docking block support reaction, analyze the influence degree drawing each influence factor: > pitch metacentric stability height > water discharge > centre of floatation position, stern inclination angle;
(3) maximal value of stern docking block support reaction is calculated, and the correctness of calculation and check result;
(4) draw matched curve, obtain the situation of change of ship undocking floating overall process stern docking block support reaction.
2. computing method as claimed in claim 1, it is characterized in that, in step (1), the foundation of mathematical model is based on equilibrium of forces principle: gravity G, buoyancy B, stern docking block support reaction Σ R balance each other,
gravity is to the moment M of stern end points O
gwith buoyancy torque M
b, stern docking block support reaction moment M
rbalance each other, M
r+ M
b=M
g.
3. computing method as claimed in claim 2, it is characterized in that, in stem floating-upward process, stern docking block support reaction reaches maximal value; In ship stern floating-upward process, stern docking block support reaction is 0.
4. computing method as claimed in claim 3, it is characterized in that, in step (3), the correctness of calculation and check result is analyzed using floating of undocking as the inverse process of the pier that lies up.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105868453A (en) * | 2016-03-25 | 2016-08-17 | 同济大学 | A railway vehicle bottom equipment rubber supporting base support reaction force acquiring method |
| CN106372345A (en) * | 2016-09-06 | 2017-02-01 | 广船国际有限公司 | Method and device for analyzing stress of ship docking blocks |
| CN110027927A (en) * | 2019-04-12 | 2019-07-19 | 上海外高桥造船有限公司 | A method of half floating seat pier formula slippage shipment |
| CN111563286A (en) * | 2020-03-20 | 2020-08-21 | 舟山中远海运重工有限公司 | Method for calculating support reaction force of ship docking block |
-
2015
- 2015-10-10 CN CN201510653726.XA patent/CN105279322A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105868453A (en) * | 2016-03-25 | 2016-08-17 | 同济大学 | A railway vehicle bottom equipment rubber supporting base support reaction force acquiring method |
| CN105868453B (en) * | 2016-03-25 | 2019-03-01 | 同济大学 | The acquisition methods of equipment rubber seat support reaction under a kind of railway vehicle truck |
| CN106372345A (en) * | 2016-09-06 | 2017-02-01 | 广船国际有限公司 | Method and device for analyzing stress of ship docking blocks |
| CN106372345B (en) * | 2016-09-06 | 2019-09-20 | 广船国际有限公司 | The force analysis method and device of ship docking block |
| CN110027927A (en) * | 2019-04-12 | 2019-07-19 | 上海外高桥造船有限公司 | A method of half floating seat pier formula slippage shipment |
| CN111563286A (en) * | 2020-03-20 | 2020-08-21 | 舟山中远海运重工有限公司 | Method for calculating support reaction force of ship docking block |
| CN111563286B (en) * | 2020-03-20 | 2022-12-13 | 舟山中远海运重工有限公司 | Method for calculating support reaction force of ship docking block |
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Application publication date: 20160127 |