CN111859486B - Analysis method for digital-analog calculation of stability of leveling machine - Google Patents
Analysis method for digital-analog calculation of stability of leveling machine Download PDFInfo
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- CN111859486B CN111859486B CN202010720308.9A CN202010720308A CN111859486B CN 111859486 B CN111859486 B CN 111859486B CN 202010720308 A CN202010720308 A CN 202010720308A CN 111859486 B CN111859486 B CN 111859486B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses an analysis method for digital-to-analog calculation of the stability of a leveling machine, which is characterized in that the analog analysis of the stability comprises the following steps: the method comprises the steps of modeling the whole machine by adopting an electric calculation software Fluent 14.0, calculating a water flow resistance coefficient and an overturning moment respectively, comparing and checking the water flow resistance coefficient with a design specification, comparing and checking a horizontal stress and an estimation result, and synthesizing the overturning moment and an artificially calculated overturning moment so as to obtain a total overturning moment. Compared with the prior art, the method has the advantages of further optimized design, greatly improved anti-overturning capability, ensured safety of offshore operation, reduced overturning risk, simple and convenient method and high calculation precision, and provides data support for the design scheme of the leveling machine, thereby improving the production management level of enterprises and saving the management cost.
Description
Technical Field
The invention relates to the technical field of engineering design and construction, in particular to an analysis method for digital-analog calculation of the stability of a leveling machine.
Background
The leveling machine is important equipment of a seabed immersed tube gravel foundation, calculates the stability of the leveling machine under the maximum working condition of the upstream surface, judges whether the leveling machine topples or not and provides data support for the design scheme of the leveling machine. The structure of the leveling machine is complex, particularly the lower frame part of the leveling machine is composed of a multi-layer truss structure, a box girder structure, and devices such as an underwater motor and a hydraulic pump station which are arranged on the structure in a staggered mode, water flow can cause turbulence through the complex structure, and the actual influence of the turbulence on the frame of the leveling machine is difficult to calculate by hand. The stability can be verified by two modes of scaling object model test and computer simulation. The scaling model test is to make a model which is basically similar to the shape of a leveling machine and has a certain size reduced in proportion, put the model into a test water pool, and simulate the conditions of water flow and waves suffered by the model. Thereby obtaining stability results close to the actual situation. The test should satisfy the following similar conditions: 1) geometric similarity-the linear scale ratios of the model to the entity are the same; 2) the fluid dynamic similarity follows the similar conditions of gravity and inertia force, the Froude number of the model and the solid is required to be equal, and whether the test result of the model is close to the actual condition is also related to the similarity of the Reynolds number.
The stability calculation of the leveling machine in the prior art is difficult to solve the verification problem of the stability of the leveling machine in water, a water tank model test generally can only meet Froude equality and cannot achieve Reynolds number equality, conditions required by the model test are relatively harsh, and the external load condition of the leveling machine is difficult to truly restore.
Disclosure of Invention
The invention aims to provide an analysis method for digital-analog calculation of stability of a leveling machine, which is designed aiming at the defects of the prior art, and adopts an analysis method of CFD (computational fluid dynamics) analog calculation to respectively calculate a water flow resistance coefficient and an overturning moment, obtains an upper limit value of an environmental water flow speed when the leveling machine works and an upper limit value of an environmental water flow speed when the leveling machine resists waves by taking 1.2 as a stability critical index according to the ratio of the calculated overturning moment to the overturning moment of the leveling machine, further splits the overturning moment generated by a tower part and the overturning moment generated by a rack part in a calculation result, can respectively optimize the tower design and the rack design in a targeted manner, is simple and convenient in method and high in calculation precision, and provides data support for a design scheme of the leveling machine, thereby improving the production management level of enterprises and saving the management cost.
The purpose of the invention is realized as follows: the method for analyzing the digital-analog calculation of the stability of the leveling machine is characterized in that a leveling machine is modeled by adopting computer software Fluent 14.0, and then the simulation analysis of the calculation stability of the leveling machine under the maximum working condition of the upstream face is carried out according to the following steps:
a, step a: the wave force and the water flow force are decoupled and calculated separately.
b, step (b): respectively calculating a water flow resistance coefficient and an overturning moment according to the calculation result of the step a, wherein the water flow resistance coefficient adopts CFD simulation to calculate a simple component water flow resistance coefficient caused by constant-speed water flow; the overturning moment is calculated manually.
c, step (c): and (4) comparing the water flow resistance coefficient of the simple component with the design specification, if the error is within the design allowable range, entering the step d through verification to calculate the horizontal stress, otherwise, returning to the step b to recalculate, and verifying by the step c until the verification is qualified.
d, step: and (4) calculating the horizontal stress caused by the tower frame water flow of the leveling machine by using the CFD for the verified simple component water flow resistance coefficient, comparing the horizontal stress with an estimation result, if the error is smaller than a design value, entering the following step e through verification, otherwise, returning to the step c for recalculation, and verifying by the step d until the verification is qualified.
e, step (e): and d, calculating the overturning moment of the whole equipment caused by the water flow force by CFD according to the horizontal stress checked and combined in the step d, synthesizing the overturning moment with the overturning moment manually calculated in the step b to obtain a total overturning moment, obtaining an upper limit value of the environmental water flow speed of the leveling machine during working and an upper limit value of the environmental water flow speed of the leveling machine during wave resistance by taking the ratio 1.2 of the overturning moment to the overturning moment as a stability critical index, further splitting the overturning moment generated by the tower part and the overturning moment generated by the rack part in the electric calculation result, and respectively optimizing the tower design and the rack design in a targeted manner.
Compared with the prior art, the method has the advantages of further optimizing design, greatly improving the anti-overturning capacity, ensuring the safety of offshore operation, reducing the overturning risk, analyzing the actual stress condition of an object with a complex shape and a complex structure, such as a leveling machine, in a fluid by adopting CFD simulation calculation, providing data support for the design scheme of the leveling machine, being simple and convenient, more accurate and effective, further saving the production cost, and improving the working efficiency and the production management level of enterprises.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
Referring to the attached figure 1, the method adopts computer software Fluent 14.0 to model the leveling machine, and then carries out simulation analysis on the calculated stability of the leveling machine under the maximum working condition of the upstream face according to the following steps:
a, step a: the wave force and the water flow force are decoupled and calculated separately.
b, step (b): respectively calculating a water flow resistance coefficient and an overturning moment according to the calculation result of the step a, wherein the water flow resistance coefficient adopts CFD simulation to calculate a simple component water flow resistance coefficient caused by constant-speed water flow; the overturning moment is calculated manually.
c, step (c): and (4) comparing the water flow resistance coefficient of the simple component with the design specification, if the error is within the design allowable range, entering the step d through verification to calculate the horizontal stress, otherwise, returning to the step b to recalculate, and verifying by the step c until the verification is qualified.
d, step: and (4) calculating the horizontal stress caused by the tower frame water flow of the leveling machine by using the CFD for the verified simple component water flow resistance coefficient, comparing the horizontal stress with an estimation result, if the error is smaller than a design value, entering the following step e through verification, otherwise, returning to the step c for recalculation, and verifying by the step d until the verification is qualified.
e, step (e): and d, calculating the overturning moment of the whole equipment caused by the water flow force by CFD according to the horizontal stress checked and combined in the step d, synthesizing the overturning moment with the overturning moment manually calculated in the step b to obtain a total overturning moment, obtaining an upper limit value of the environmental water flow speed of the leveling machine during working and an upper limit value of the environmental water flow speed of the leveling machine during wave resistance by taking the ratio 1.2 of the overturning moment to the overturning moment as a stability critical index, further splitting the overturning moment generated by the tower part and the overturning moment generated by the rack part in the electric calculation result, and respectively optimizing the tower design and the rack design in a targeted manner.
The invention has been described in further detail in order to avoid limiting the scope of the invention, and it is intended that all such equivalent embodiments be included within the scope of the following claims.
Claims (1)
1. The analysis method for calculating the stability digital model of the leveling machine is characterized in that a computer software Fluent 14.0 is adopted to model the leveling machine, and then the stability digital model of the leveling machine under the maximum working condition of the upstream surface is calculated and analyzed according to the following steps:
a, step: decoupling and separately calculating wave force and water flow force;
b, step (b): respectively calculating a water flow resistance coefficient and an overturning moment according to the calculation result of the step a, wherein the water flow resistance coefficient adopts CFD simulation to calculate a simple component water flow resistance coefficient caused by constant-speed water flow; the overturning moment is calculated manually;
c, step (c): comparing the water flow resistance coefficient of the simple component with the design specification, if the error is within the design allowable range, entering the step d through verification to calculate the horizontal stress, otherwise, returning to the step b to recalculate, and verifying by the step c until the verification is qualified;
d, step: calculating the horizontal stress caused by the water flow of the tower frame of the leveling machine by using the CFD for the verified water flow resistance coefficient of the simple component, comparing the horizontal stress with an estimation result, if the error is smaller than a design value, entering the following step e through verification, otherwise, returning to the step c for recalculation, and verifying by the step d until the verification is qualified;
e, step (e): and d, calculating the overturning moment of the whole equipment caused by the water flow force by CFD according to the horizontal stress checked and combined in the step d, synthesizing the overturning moment with the overturning moment manually calculated in the step b to obtain a total overturning moment, obtaining an upper limit value of the environmental water flow speed of the leveling machine during working and an upper limit value of the environmental water flow speed of the leveling machine during wave resistance by taking the ratio 1.2 of the overturning moment to the overturning moment as a stability critical index, further splitting the overturning moment generated by the tower part and the overturning moment generated by the rack part in the electric calculation result, and respectively optimizing the tower design and the rack design in a targeted manner.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106557645A (en) * | 2016-03-04 | 2017-04-05 | 中国人民解放军海军潜艇学院 | A kind of method for adjusting the aircraft ballast amount underwater berthed |
| CN109440796A (en) * | 2018-11-30 | 2019-03-08 | 中铁第四勘察设计院集团有限公司 | Suitable for the inverted T shaped precast caisson of deep water drift net area or shallow overburden basis and its construction method |
| CN109558694A (en) * | 2018-12-26 | 2019-04-02 | 哈尔滨工程大学 | A kind of implementing hydrodynamic analysis method of underwater robot and arm-and-hand system crawl motion process |
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| US7575397B2 (en) * | 2006-08-14 | 2009-08-18 | Sergey Sharapov | Floating platform with non-uniformly distributed load and method of construction thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106557645A (en) * | 2016-03-04 | 2017-04-05 | 中国人民解放军海军潜艇学院 | A kind of method for adjusting the aircraft ballast amount underwater berthed |
| CN109440796A (en) * | 2018-11-30 | 2019-03-08 | 中铁第四勘察设计院集团有限公司 | Suitable for the inverted T shaped precast caisson of deep water drift net area or shallow overburden basis and its construction method |
| CN109558694A (en) * | 2018-12-26 | 2019-04-02 | 哈尔滨工程大学 | A kind of implementing hydrodynamic analysis method of underwater robot and arm-and-hand system crawl motion process |
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| "深水水下步履式整平机的研发";华寅超;《工程机械》;20180731;全文 * |
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