CN108763693B - Ship equipment weight distribution statistical method based on three-dimensional model - Google Patents

Ship equipment weight distribution statistical method based on three-dimensional model Download PDF

Info

Publication number
CN108763693B
CN108763693B CN201810476985.3A CN201810476985A CN108763693B CN 108763693 B CN108763693 B CN 108763693B CN 201810476985 A CN201810476985 A CN 201810476985A CN 108763693 B CN108763693 B CN 108763693B
Authority
CN
China
Prior art keywords
equipment
weight distribution
model
ship
equal
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.)
Active
Application number
CN201810476985.3A
Other languages
Chinese (zh)
Other versions
CN108763693A (en
Inventor
凌昊
肖伟
柏铁朝
周亮
肖泥土
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Ship Development and Design Centre
Original Assignee
China Ship Development and Design Centre
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Ship Development and Design Centre filed Critical China Ship Development and Design Centre
Priority to CN201810476985.3A priority Critical patent/CN108763693B/en
Publication of CN108763693A publication Critical patent/CN108763693A/en
Application granted granted Critical
Publication of CN108763693B publication Critical patent/CN108763693B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00—Manipulating 3D models or images for computer graphics
    • G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Evolutionary Computation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Architecture (AREA)
  • Computer Graphics (AREA)
  • Software Systems (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)

Abstract

The invention relates to a ship equipment weight distribution statistical method based on a three-dimensional model, S1, constructing an equal density equipment model of each equipment based on the equipment model, S2, obtaining an integral equipment model by Boolean merging of all the equal density equipment models of the whole ship; s3, segmenting the whole equipment model in the ship length direction according to the precision requirement; s4, outputting the weight distribution values and the position information of the segments in batches; and S5, drawing the weight distribution value and the position information into a weight distribution curve. According to the invention, the equipment is equivalent to a homogeneous regular body with equal weight and equal longitudinal distribution length, so that the weight distribution problem is converted into an equivalent volume distribution problem, statistical calculation is effectively realized by means of a three-dimensional model, and automatic calculation of longitudinal weight distribution of ship equipment is realized; the calculation data source comes from the design model, no statistical omission exists, hundreds of equipment models are combined into one object for processing by adopting a batch Boolean combination method, and the processing efficiency is greatly improved.

Description

Ship equipment weight distribution statistical method based on three-dimensional model
Technical Field
The invention relates to the technical field of ship overall design, in particular to a ship equipment weight distribution statistical method based on a three-dimensional model.
Background
The calculation of the total vibration of the hull is an important work item for ensuring the safety of the ship. And the longitudinal distribution of the load of the whole ship is one of input factors of the calculation of the total vibration of the ship body. The ship equipment load is one of the important components of the whole ship load weight, and how to quickly and accurately obtain the weight distribution of the ship equipment is a practical problem in front of designers.
In order to obtain the weight distribution of ship equipment in the past, designers need to perform item weight statistics on each piece of equipment according to a design drawing, perform approximate uniform sharing on the weight of each piece of equipment along a longitudinal distribution interval of each piece of equipment according to the arrangement condition to obtain the weight distribution of each item, and finally superimpose the average value of the weight distribution of each item to approximately obtain the weight distribution of the ship equipment. The whole work flow mainly depends on manual operation of designers, and is long in time period, low in calculation precision and easy to omit.
Disclosure of Invention
The invention aims to solve the technical problem that the defects of the prior art are overcome, and the ship equipment weight distribution statistical method based on the three-dimensional model is provided, so that the distribution of the weight of the ship equipment along the ship length direction can be rapidly and accurately extracted, and data are provided for the calculation of the total vibration of a ship body.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a ship equipment weight distribution statistical method based on a three-dimensional model comprises the following steps:
s1, constructing an equal density equipment model of each equipment according to the formula (1) based on the equipment model:
Figure BDA0001664725300000021
in the formula, S is the cross-sectional area of the equal-density equipment model, rho is the uniform equipment density of the whole ship equipment, M is the weight of certain equipment, and L is the longitudinal length of the equipment;
s2, carrying out Boolean combination on all the equal-density equipment models of the whole ship to obtain an integral equipment model;
s3, segmenting the whole equipment model in the ship length direction according to the precision requirement;
s4, outputting the weight distribution value and the position information of each segment in batches: suppose that the length of the ith segment is LiMeasuring its volume as ViThen its weight distribution value FiCan be calculated by equation (2):
Figure BDA0001664725300000022
outputting the weight distribution values and the position information of the segments in batches according to a formula (2);
s5, drawing the weight distribution value and the position information into a weight distribution curve, and drawing the midpoint coordinate x of each segmentiAnd FiDrawing coordinate points and connecting by a spline curve to obtain the weight distribution curve of the equipment.
In the above scheme, the segmentation in step S3 is equal length segmentation, the distance is selected according to the precision requirement, and the length L of the segmented model isiThe smaller the calculation result, the higher the accuracy.
In the above scheme, the medium-density device model in step S1 is a rectangular parallelepiped or a cylinder.
The invention has the beneficial effects that:
1. according to the method, the weight distribution problem is converted into the equivalent volume distribution problem by equating the equipment to the homogeneous regular bodies with equal weight and equal longitudinal distribution length, so that the statistical calculation is effectively realized by depending on a three-dimensional model, the automatic calculation of the longitudinal weight distribution of the ship equipment is realized, and the calculation efficiency is improved.
2. The calculation data source comes from the design model, no statistical omission exists, hundreds of equipment models are combined into one object for processing by adopting a batch Boolean combination method, and the processing efficiency is greatly improved.
3. The precision adjustment of the distributed load can be realized by adjusting the length of the segments.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a perspective view of an information combining cabinet according to an embodiment of the present invention;
FIG. 2 is a perspective view of an iso-density model of a certain information combining cabinet shown in FIG. 1;
FIG. 3 is a perspective view of an overall model of a piece of equipment in a cabin according to an embodiment of the present invention;
FIG. 4 is a fragmentary plan view of an embodiment of the present invention;
FIG. 5 is a graph of the weight distribution of equipment in a section of a tank in an embodiment of the invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Taking a certain cabin section device as an example, 26 devices are arranged in the cabin section, and the ship device weight distribution statistical method based on the three-dimensional model provided by the invention comprises the following steps:
s1, determining the weight M and the longitudinal length L of the equipment based on the equipment design model or the equipment design drawing, and then constructing an equal-density equipment model of each equipment according to the formula (1):
Figure BDA0001664725300000031
in the formula, S is the cross-sectional area of the equal-density equipment model, rho is the uniform equipment density of the whole ship equipment, M is the weight of certain equipment, and L is the longitudinal length of the equipment.
Taking a certain information combination cabinet as an example, as shown in fig. 1, the total weight of the equipment is 250kg, and the longitudinal length of the equipment is 540 mm. Assuming a uniform equipment density of 1000kg/m3Then, according to the formula (1), an equal density model of the apparatus can be constructed to have a longitudinal length of 540mm and a cross-sectional area of 0.463m2As shown in fig. 2. Further, the height of the equal-density model and the original equipment is taken to be 1.4m, and then the width of the cross section is 0.33 m.
And sequentially modeling each device in the cabin of the cabin section according to the method.
It should be noted that the specific shape of the iso-density model of each device can be freely selected according to the needs, such as a rectangular solid, a cylinder, etc., as long as the cross-sectional area meets the calculation requirements.
The invention directly adopts the equipment design model as a data source to participate in statistical calculation, realizes the consistency of the design model and the statistical calculation model, and can effectively ensure that statistics is not omitted.
S2, performing Boolean merging on the 26 equal-density equipment models established in the step S1 to form an overall equipment model, wherein an axial view of the overall equipment model is shown in FIG. 3;
s3, segmenting the whole equipment model in the ship length direction according to the precision requirement;
in this embodiment, the overall model of the apparatus is segmented into equal lengths in the ship length direction at 10mm first gear, and a segmented axis view is shown in fig. 4. By adopting an automatic longitudinal segmentation technology, the weight distribution value is reduced from the traditional 600mm grade to 10mm grade, and the calculation precision is improved by about 60 times.
S4, measuring the volume of the ith segment as ViThen its weight distribution value FiCan be calculated by equation (2):
Figure BDA0001664725300000041
in the formula, Li＝10mm。
Outputting the weight distribution value and the position information of each segment in batches according to a formula (2), extracting the volume of one segment by moving 10mm along the ship length direction through a batch processing program, recording the position information and outputting the position information to EXCEL, multiplying the volume of the segment by equivalent density to obtain the load weight of the segment, and finally dividing the load weight of the segment by the length of the segment by 10mm to obtain the load distribution value. The distances between the foreship and the ship are 43.98m to 42.98m, as shown in table 1:
TABLE 1
Figure BDA0001664725300000042
Figure BDA0001664725300000051
Figure BDA0001664725300000061
Figure BDA0001664725300000071
S5, drawing the weight distribution value and the position information into a weight distribution curve, and drawing the midpoint coordinate x of each segmentiAnd FiDrawing coordinate points and connecting by a spline curve to obtain the weight distribution curve of the equipment, as shown in figure 5.
In summary, the statistical method for the weight distribution of the ship equipment based on the three-dimensional model is to reprocess the ship equipment model, construct an equal-density equipment model, construct a ship equipment load solving model through a series of technical processing such as model merging and segmentation, design a corresponding algorithm and automatically calculate the longitudinal weight distribution value of the ship equipment. By the method, the longitudinal weight distribution of the ship equipment is automatically calculated, the calculation efficiency is improved, and the precision adjustment of the distributed load can be realized by adjusting the length of the segments.
It should be noted that the model represents volume elements, but different devices are made of different materials and have different densities, and the method of the present invention adopts the equal density principle to convert the weight distribution problem into the volume distribution problem, in view of the following considerations:
(1) for most of the equipment, the longitudinal length of the equipment is negligible compared with the main dimension of the whole ship (such as 0.3m long equipment and 70m long whole ship), and the equipment can be regarded as concentrated load. Concentrated loads cannot be statistically superposed, and therefore, the concentrated loads can be uniformly distributed over a relatively short length and are represented by distributed loads. In this case, the device is considered as being of equal or unequal density, and has no engineering effect as long as the total amount remains unchanged.
(2) For equipment with larger weight scale, the equipment is considered to be a homogeneous rule body and has errors due to different materials and shapes, but the influence is not large. The reason is that the equipment with larger weight scale (such as a propulsion motor and the like) accounts for less than 3% of the whole ship load, and the equipment with irregular shape and poor density uniformity is fewer. The deviation of these devices has a very small effect compared to the full ship load and is therefore suitable for engineering considerations as a homogeneous regular body.
Therefore, the method is feasible by adopting the equal density principle, and improves the efficiency and the precision of weight distribution calculation of the ship equipment on the premise of meeting the requirement of engineering calculation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (3)

1. A ship equipment weight distribution statistical method based on a three-dimensional model is characterized by comprising the following steps:
s1, constructing an equal density equipment model of each equipment according to the formula (1) based on the equipment model:
Figure FDA0001664725290000011
in the formula, S is the cross-sectional area of the equal-density equipment model, rho is the uniform equipment density of the whole ship equipment, M is the weight of certain equipment, and L is the longitudinal length of the equipment;
s2, carrying out Boolean combination on all the equal-density equipment models of the whole ship to obtain an integral equipment model;
s3, segmenting the whole equipment model in the ship length direction according to the precision requirement;
s4, outputting the weight distribution value and the position information of each segment in batches: suppose that the length of the ith segment is LiMeasuring its volume as ViThen, thenIts weight distribution value FiCan be calculated by equation (2):
Figure FDA0001664725290000012
outputting the weight distribution value and the position information of each segment in batches according to a formula (2);
s5, drawing the weight distribution value and the position information into a weight distribution curve, and drawing the midpoint coordinate x of each segmentiAnd FiDrawing coordinate points and connecting by a spline curve to obtain the weight distribution curve of the equipment.
2. The three-dimensional model-based statistical method for weight distribution of marine equipment according to claim 1, wherein the segments in step S3 are equal-length segments, the distance is selected according to the accuracy requirement, and the length L of the segment model isiThe smaller the calculation result, the higher the accuracy.
3. The three-dimensional model-based statistical method for weight distribution of marine equipment according to claim 1, wherein the medium-density equipment model in step S1 is a rectangular parallelepiped or a cylinder.
CN201810476985.3A 2018-05-18 2018-05-18 Ship equipment weight distribution statistical method based on three-dimensional model Active CN108763693B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810476985.3A CN108763693B (en) 2018-05-18 2018-05-18 Ship equipment weight distribution statistical method based on three-dimensional model

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810476985.3A CN108763693B (en) 2018-05-18 2018-05-18 Ship equipment weight distribution statistical method based on three-dimensional model

Publications (2)

Publication Number Publication Date
CN108763693A CN108763693A (en) 2018-11-06
CN108763693B true CN108763693B (en) 2022-07-01

Family

ID=64007146

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810476985.3A Active CN108763693B (en) 2018-05-18 2018-05-18 Ship equipment weight distribution statistical method based on three-dimensional model

Country Status (1)

Country Link
CN (1) CN108763693B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112407184B (en) * 2020-11-30 2022-04-12 江南造船(集团)有限责任公司 Method and system for calculating weight gravity center distribution of ship

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105022882A (en) * 2015-07-23 2015-11-04 大连海事大学 Ship still water shearing force and bending moment calculating method
CN106871880A (en) * 2017-01-05 2017-06-20 迈瑞菲（北京）科技发展有限公司 The method that rib position, half-breadth and height carry out ship closure is calculated using three-dimensional coordinate

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USH2195H1 (en) * 2003-09-08 2007-07-03 The United States Of America As Represented By The Secretary Of The Navy Technique for modeling shipboard systems and equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105022882A (en) * 2015-07-23 2015-11-04 大连海事大学 Ship still water shearing force and bending moment calculating method
CN106871880A (en) * 2017-01-05 2017-06-20 迈瑞菲（北京）科技发展有限公司 The method that rib position, half-breadth and height carry out ship closure is calculated using three-dimensional coordinate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
一种利用CATIA求解割面惯性矩的方法;周亮 等;《2017年数字化造船学术交流会议》;20170630;第31-35页 *

Also Published As

Publication number Publication date
CN108763693A (en) 2018-11-06

Similar Documents

Publication Publication Date Title
CN108711141B (en) Motion blurred image blind restoration method using improved generation type countermeasure network
CN109989585B (en) Real-time feedback control method for printing precision of 3D printer
CN108688142B (en) Three-dimensional printing method and system
CN104570940A (en) CNC machining and machine-adjusting system and method
CN108763693B (en) Ship equipment weight distribution statistical method based on three-dimensional model
CN111723441B (en) Plastic part pre-deformation part modeling method, system, device and storage medium
CN108763691A (en) Weight of ship statistical method based on threedimensional model
CN108573117B (en) Ship deformation monitoring and calculating method and device
CN114169667A (en) Method for pre-estimating and controlling weight of empty ship
CN111444661A (en) Method for eliminating warping phenomenon in interactive prism grid generation
CN110428479A (en) A kind of Solid works two-dimensional engineering graphic size marking error correction self-adapting regulation method
CN109885955B (en) Wind load calculation method and calculation system
CN104317996A (en) Method for designing and evaluating center of gravity of airplane
CN102581696A (en) Machining standard adjusting method for numerical control machining of large casting
CN103020351A (en) Three-dimensional real-time display method of airplane poses
CN107862656A (en) A kind of Regularization implementation method, the system of 3D rendering cloud data
CN112861239B (en) Initial ground stress balance method, system, equipment and storage medium of numerical model
CN103411562B (en) A kind of structured light strip center extraction method based on dynamic programming and average drifting
CN110175372B (en) Envelope surface characterization method based on mother surface characteristic parameters
CN114332206A (en) Attitude correction parameter determination method and device and computer equipment
CN111783217B (en) Automatic size obtaining method for machined part blanks based on CATIA VBA
CN111968183B (en) Gauge block calibration method for calibrating monocular line laser three-dimensional measurement module
CN111768347B (en) Method for judging whether part tool is suitable for changing analog quantity into digital quantity
CN108197613A (en) A kind of Face datection optimization algorithm based on depth convolution cascade network
US9519960B2 (en) Method for estimating a number of objects

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
GR01 Patent grant
GR01 Patent grant