CN107368632B - Load distribution optimization method for calandria cable laying - Google Patents
Load distribution optimization method for calandria cable laying Download PDFInfo
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- CN107368632B CN107368632B CN201710496495.5A CN201710496495A CN107368632B CN 107368632 B CN107368632 B CN 107368632B CN 201710496495 A CN201710496495 A CN 201710496495A CN 107368632 B CN107368632 B CN 107368632B
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Abstract
The invention provides a load distribution optimization method for a calandria cable laying. A load distribution optimization method for a calandria laid cable specifically refers to how to distribute load current of each loop cable on the basis of the number of existing cable loops and total load amount to enable the maximum temperature of a cable conductor to be minimum, and therefore optimal distribution of load is achieved. Under the condition that a plurality of optional load distribution schemes are provided, the load corresponding to the load distribution schemes is calculated according to different load distribution schemes, the highest temperature values of all cable conductors corresponding to different load distribution schemes are compared, and the load distribution scheme corresponding to the lowest highest temperature value of all cable conductors is the optimal distribution scheme.
Description
Technical Field
The invention relates to the technical field of cable laying, in particular to a calandria cable laying load distribution optimization method.
Background
For a certain cable loop and total load, there are often a plurality of alternative load distribution schemes, and different load distribution schemes have different corresponding temperature fields, so that it is necessary to obtain an optimal load distribution scheme by comparing the maximum temperatures of the cable conductors corresponding to the different load distribution schemes.
Disclosure of Invention
The invention aims to provide a load distribution optimization method for cable laying in a pipe arrangement, under the condition that a plurality of optional load distribution schemes are provided, corresponding loads are calculated according to different load distribution schemes, the highest temperature values of all cable conductors corresponding to the different load distribution schemes are compared, and the corresponding load distribution scheme is the optimal distribution scheme when the highest temperature value of all cable conductors is the lowest.
In order to solve the technical problems, the invention adopts the technical scheme that: a load distribution optimization method for a calandria cable laying is characterized by comprising the following steps:
step 1: determining an alternative cable load distribution scheme according to the number of loops of the laid cables and the total load;
step 2: constructing a finite element simulation model of a cable temperature field based on ANSYS software according to the on-site laying condition;
and step 3: loading corresponding loads and boundary conditions to the finite element simulation model, and simulating a steady-state temperature field of each load distribution scheme;
and 4, step 4: and acquiring the highest temperature of all cable conductors corresponding to each load distribution scheme according to the steady-state temperature field, and selecting the optimal load distribution scheme by taking the lowest value of the highest temperatures of all cable conductors as an evaluation standard. That is, the load distribution scheme corresponding to the lowest highest temperature value of all the cable conductors is the optimal distribution scheme.
Further, the step 1 comprises the following steps:
and K represents the number of loops, J represents the number of optional load distribution schemes, and F represents the total load, the load distribution scheme matrix I is represented as follows:
in the formula ijk(j 1, 2.. times, Jk 1, 2.. times, K) represents the load current of the kth loop in the jth load distribution scheme, and satisfies the requirement
Further, the step 2 comprises the following sub-steps:
step 2.1: in ANSYS software, constructing a geometric model according to a structural schematic diagram of a cement prefabricated member, structural parameters of a cable and a defined medium area around the cement prefabricated member;
step 2.2: defining the unit attribute and the material attribute of the geometric model obtained in the step 2.1, and performing attribute distribution according to the defined unit attribute and the defined material attribute;
step 2.3: and (3) selecting a meshing tool to perform meshing on the geometric model with the attributes distributed in the step 2.2 to obtain a finite element simulation model.
Further, the step 3 comprises the following sub-steps:
step 3.1: for each load distribution scheme, calculating the heat generation rate loads of all cable conductors, insulating layers and steel tape armoring layers according to the load current of each loop, and loading the heat generation rate loads to corresponding parts in a finite element simulation model;
step 3.2: loading three types of boundary conditions on the finite element simulation model;
step 3.3: a steady state analysis is selected to obtain a steady state temperature field for each load distribution scenario.
Compared with the prior art, the invention has the beneficial effects that:
the simulation model can better reflect the actual situation of the site, and the accuracy of the calculation result of the temperature field is higher; the temperature field of each distribution scheme can be calculated through the load current of each loop cable in each distribution scheme, and then the optimal distribution scheme is obtained through comparison, so that the method is simple and feasible.
Drawings
Fig. 1 is a schematic structural diagram of a cement prefabricated member laid by a calandria.
Fig. 2 is a grid division diagram of a simulation model of a cable duct laying temperature field.
Fig. 3 is a temperature field distribution diagram corresponding to the arrangement pipe laying six-loop cable in the optimal load distribution scheme.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
A calandria cable laying load distribution optimization method comprises the following steps:
step 1: determining an alternative cable load distribution scheme according to the number of loops of the laid cables and the total load;
in this example, the number K of cable loops is 6; the number of alternative load distribution schemes J is 10; total load F is 4680A; the load distribution scheme matrix I is then represented as follows:
in the formula ijk(j 1, 2.. times, Jk 1, 2.. times, K) represents the load current of the kth loop in the jth load distribution scheme, and satisfies the requirement
Step 2: constructing a finite element simulation model of a cable temperature field based on ANSYS software according to the on-site laying condition;
in this embodiment, step 2 includes the following substeps:
step 2.1: in ANSYS software, a geometric model is constructed from a schematic representation of the structure of the cement preform, the structural parameters of the cable and the defined region of the medium surrounding the cement preform. The structural schematic diagram of the cement prefabricated member is shown in figure 1. In the figure, the box is a cement prefabricated member, and the cable is threaded in the PE pipeline, and the inner diameter and the outer diameter of the cable are 148mm and 160mm respectively. d1＝d2＝250mm，L1＝1080mm，L2＝1330mm，
L31580 mm. In addition, the capital letters A-L in the figures represent different loops.
In this embodiment, the cable model is YJV22-8.7/15-3 × 240, and the structure and parameters thereof are as follows:
the medium around the cement prefabricated member is soil, the horizontal straight line 3000mm below the lower side of the cement prefabricated member is taken as a deep soil boundary, two vertical straight lines 3000mm away from the left side and the right side of the cement prefabricated member are taken as left and right boundaries, and the ground is taken as the boundary at the upper part.
Step 2.2: and defining the unit attribute and the material attribute of the geometric model obtained in the step 2.1, and performing attribute distribution according to the defined unit attribute and the defined material attribute. The cell of the geometric model is defined as PLANE121 cell, and since the simulation object is a temperature field, the material property of the geometric model is to set the thermal conductivity of each part of the geometric model, as shown in the following table:
step 2.3: and (3) selecting a meshing tool to perform meshing on the geometric model with the attributes distributed in the step 2.2 to obtain a finite element simulation model. The mesh division is free mesh division of the geometric model by using triangular meshes, as shown in fig. 2.
And step 3: loading corresponding loads and boundary conditions to the finite element simulation model, and simulating a steady-state temperature field of each load distribution scheme;
in this embodiment, step 3 includes the following substeps:
step 3.1: for each load distribution scheme, the heat generation rate loads of all cable conductors, insulating layers and steel tape armors are calculated according to the load current of each loop and loaded in corresponding parts in a finite element simulation model.
Step 3.2: and loading three types of boundary conditions for the finite element simulation model. And loading a first type of boundary condition to the finite element simulation model, namely, taking the temperature of the deep soil to be 22 ℃. And loading a second type of boundary condition to the finite element simulation model, wherein the normal heat flow density of the soil boundary at the left side and the right side is 0. Loading a third type of boundary conditions to the finite element simulation model, namely, the surface air temperature is 30 ℃; during the test, the weather is clear and light wind, and the natural convection coefficient of the air is selected to be 12.5W/(m)2·K)。
Step 3.3: a steady state analysis is selected to obtain a steady state temperature field for each load distribution scenario.
And 4, step 4: and acquiring the highest temperature of all cable conductors corresponding to each load distribution scheme according to the steady-state temperature field, and selecting the optimal load distribution scheme by taking the lowest value of the highest temperatures of all cable conductors as an evaluation standard. Fig. 3 is a temperature field distribution diagram corresponding to the arrangement pipe laying six-loop cable in the optimal load distribution scheme.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A load distribution optimization method for a calandria cable laying is characterized by comprising the following steps:
step 1: determining an alternative cable load distribution scheme according to the number of loops of the laid cables and the total load;
step 2: constructing a finite element simulation model of a cable temperature field based on ANSYS software according to the on-site laying condition;
and step 3: loading corresponding loads and boundary conditions to the finite element simulation model, and simulating a steady-state temperature field of each load distribution scheme;
and 4, step 4: and acquiring the highest temperature of all cable conductors corresponding to each load distribution scheme according to the steady-state temperature field, and selecting the optimal load distribution scheme by taking the lowest value of the highest temperatures of all cable conductors as an evaluation standard.
2. The pipe-laying cable load distribution optimization method according to claim 1, wherein the step 1 comprises the following steps:
and K represents the number of loops, J represents the number of optional load distribution schemes, and F represents the total load, the load distribution scheme matrix I is represented as follows:
in the formula iJKRepresents the load current of the kth circuit in the jth load distribution scheme, wherein J1, 2
3. The pipe-arranging cabling load distribution optimization method according to claim 1, wherein said step 2 comprises the following substeps:
step 2.1: in ANSYS software, constructing a geometric model according to a structural schematic diagram of a cement prefabricated member, structural parameters of a cable and a defined medium area around the cement prefabricated member;
step 2.2: defining the unit attribute and the material attribute of the geometric model obtained in the step 2.1, and performing attribute distribution according to the defined unit attribute and the defined material attribute;
step 2.3: and (3) selecting a meshing tool to perform meshing on the geometric model with the attributes distributed in the step 2.2 to obtain a finite element simulation model.
4. The pipe-arranging cabling load distribution optimization method according to claim 1, wherein said step 3 comprises the following substeps:
step 3.1: for each load distribution scheme, calculating the heat generation rate loads of all cable conductors, insulating layers and steel tape armoring layers according to the load current of each loop, and loading the heat generation rate loads to corresponding parts in a finite element simulation model;
step 3.2: loading three types of boundary conditions on the finite element simulation model;
step 3.3: a steady state analysis is selected to obtain a steady state temperature field for each load distribution scenario.
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| Position optimization of cables in ducts with FEM;Haiqing Niu 等;《2016 International Conference on Condition Monitoring and Diagnosis (CMD)》;20161201;正文第Ⅰ-Ⅲ部分 * |
| 基于渗流有限长线热源地埋管管群换热分析与优化;李永 等;《太阳能学报》;20150630;第36卷(第6期);全文 * |
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