CN110888174A - Topology design method for rotating base of rotating accelerometer type gravity gradient measuring device - Google Patents
Topology design method for rotating base of rotating accelerometer type gravity gradient measuring device Download PDFInfo
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Abstract
The invention relates to a topological design method of a rotating seat of a rotating accelerometer type gravity gradient measuring device, which comprises the following steps: carrying out simulation analysis on the original rotating base model to know the stress distribution characteristics of the original rotating base model; carrying out topology optimization design on the rotating base model; performing reverse three-dimensional space reconstruction on the rotating base model; and (5) checking the strength of the reconstructed rotating base model. The topological design method of the rotating seat of the rotating accelerometer type gravity gradient measuring device solves the optimal mass layout and the simplest force transmission path of the structure by using a topological analysis means, indicates the direction for the design, breaks through the technical bottleneck that the rigidity and the strength are difficult to continuously improve by changing the structural form and the size parameter for multiple times in a limited scale in the traditional design, and realizes the optimal design of the rotating seat structure under the conditions of simultaneously meeting various requirements of the strength, the rigidity and the light weight in the application of a small carrier.
Description
Technical Field
The invention relates to a rotating accelerometer type gravity gradient measuring device, in particular to a topological design method of a rotating base of the rotating accelerometer type gravity gradient measuring device.
Background
The gravity gradient measurement device (GGI) has the requirement of accurate pointing of a sensitive shaft of an accelerometer, and needs to strictly control the tangential angle and the pitch angle of the sensitive shaft in a measurement plane. The method has the advantages of precise adjustment link and high-rigidity mechanical structure guarantee. The mass and the rotational inertia of the rotating seat, which are internal core supporting structures, directly determine the selection of a rotating shafting motor and the volume weight of the GGI, so that the volume weight of the inertially stabilized platform of the whole gravity gradiometer is determined, and a 'heavy' structural form cannot be adopted. As shown in fig. 1, the rotating base needs to be provided with multiple components such as an accelerometer adjusting mechanism, a multi-layer shielding case, a meter-adding servo board, a temperature control circuit board and the like, as shown in fig. 2, the structure is complex, the space is limited, and the existing design is the 'optimal' structural form which can be achieved by the traditional design method. The invention provides a topological design method, which can greatly reduce the weight on the premise of ensuring that the strength of a rotating seat is basically unchanged.
Disclosure of Invention
Compared with the original structure, the rotating seat structure realized by the topological design method has the advantages that under the combined action of the same normal load and the same tangential load, the stress change does not exceed +/-10%, and the weight is reduced by more than 30%.
The technical problem to be solved by the invention is realized by the following technical scheme:
a topology design method for a rotating base of a rotating accelerometer type gravity gradient measuring device comprises the following steps:
(1) carrying out simulation analysis on the original rotating base model to know the stress distribution characteristics of the original rotating base model: analyzing the actual working condition of the rotating seat, abstracting to boundary constraint and applying load to the rotating seat model, and performing statics simulation analysis to obtain the stress distribution and the maximum stress of the original rotating seat model under the actual working condition;
(2) carrying out topology optimization design on the rotating base model: setting constraint limits of a rotating seat model, an optimized weight reduction area and a reserved area of the model, setting a topological optimization target and a convergence criterion, and obtaining a rotating seat topological optimization result: the optimization target is set to be 3-040% of the original structure of the mass, the spatial mass distribution under the maximum structural rigidity is solved, the mechanical interface parts of the rotating seat and peripheral parts of the rotating seat are set to be reserved, and other areas can be optimized and lightened to obtain a discrete model;
(3) and (3) performing reverse three-dimensional space reconstruction on the rotating base model: analyzing the optimal force transmission path of the discrete model under actual constraint and load from the discrete model after the topological design of the rotating base, and performing reverse three-dimensional reconstruction on the discrete model to obtain a reconstructed rotating base model structure;
(4) and (3) carrying out strength check on the reconstructed rotating base model: and (4) checking the strength of the reconstructed rotating base model, applying the same boundary conditions and loads, performing statics simulation analysis, and verifying whether the strength meets the setting of a topological optimization target.
In addition, the original rotating seat model is necessarily simplified in the step 1), and only one eighth of the rotating seat model is needed to be taken for analysis in consideration of the fact that the rotating seat model is of a periodically symmetrical structure; the topological optimization design in the step 2) is also an eighth discrete model.
In step 1), the gravity of the rotating seat and the meter mounting and adjusting mechanism is equivalent to a far-end force which is applied to the mounting surface of the original rotating seat model mounting and adjusting mechanism, and the action point of the far-end force is located at the equivalent mass center of the mounting and adjusting mechanism; the centrifugal force of the surface mounting and adjusting mechanism is equivalent to normal force with the same size, and acts on the mounting surface of the original rotating seat model mounting and adjusting mechanism, and the direction is along the normal direction of the mounting surface; and applying fixed constraint to the upper surface and the lower surface of the model to simulate the action of shafting at two ends of the GGI on the rotating seat.
The invention has the advantages and beneficial effects that:
the topological design method of the rotating seat of the rotating accelerometer type gravity gradient measuring device solves the optimal mass layout and the simplest force transmission path of the structure by using a topological analysis means, indicates the direction for the design, breaks through the technical bottleneck that the rigidity and the strength are difficult to continuously improve by changing the structural form and the size parameter for multiple times in a limited scale in the traditional design, and realizes the optimal design of the rotating seat structure under the conditions of simultaneously meeting various requirements of the strength, the rigidity and the light weight in the application of a small carrier.
Drawings
FIG. 1 is a schematic view of an original rotary base model;
FIG. 2 is a schematic diagram of the outward structure of the rotating body;
FIG. 3 illustrates the boundary conditions and loads of the original model of the rotating base;
FIG. 4 is a stress cloud of the original model of the rotating base;
FIG. 5 is a discrete model after topology optimization;
FIG. 6 is a representation of a rotating base model after reverse three-dimensional reconstruction;
FIG. 7 illustrates the model boundary conditions and loads after optimization of the rotating base;
FIG. 8 is a cloud diagram of model stresses after optimization of the rotating base.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A topological design method of a rotating base of a rotating accelerometer type gravity gradient measuring device comprises the following steps: the method comprises the following steps:
(1) carrying out simulation analysis on the original rotating base model to know the stress distribution characteristics of the original rotating base model: analyzing the actual working condition of the rotating seat, abstracting to be proper boundary constraint and applying load to the rotating seat, performing statics simulation analysis, and solving the stress distribution and the maximum stress of the original model of the rotating seat under the actual working condition.
And (3) carrying out necessary simplification on the model, and considering that the rotating seat model is of a periodically symmetrical structure, only one eighth of the rotating seat model is needed to be taken for analysis. Therefore, the calculation time can be greatly shortened, and the simulation efficiency is improved. When GGI (gravity gradient measurement device) works normally, the rotating seat is mainly under the combined action of gravity of the meter-adding rotating seat adjusting mechanism and the rotating centrifugal force of the meter-adding rotating seat adjusting mechanism. The gravity of the meter installing and adjusting mechanism is equivalent to a far-end force D (12.5N) which is applied to the installation surface of the rotating seat model installing and adjusting mechanism, and the action point of the far-end force is located at the equivalent mass center of the rotating seat installing and adjusting mechanism. The centrifugal force of the dial-up mechanism is equivalent to a normal force C (37.5N) with the same magnitude, and acts on the mounting surface of the rotating seat adjusting mechanism, and the direction is along the normal direction of the mounting surface. And applying fixed constraint B to the upper surface and the lower surface of the rotating seat model to simulate the action of shafting at two ends of the GGI on the rotating seat. The simulation model after applying the constraints and loads is shown in fig. 3.
The stress distribution cloud chart is shown in FIG. 4. The original model mass of the rotary seat is 6.41336kg, and the maximum stress is 0.22009MPa under the combined action of the gravity of the meter-adding adjusting mechanism and the centrifugal force of the meter-adding adjusting mechanism due to rotation.
(2) Carrying out topology optimization design on the rotating base model: and setting constraint limits of the rotating seat model, optimizing a weight reduction area and a reserved area of the model, and reasonably setting a topological optimization target and a convergence criterion to obtain a rotating seat topological optimization result. The optimization target is set to be 30-40% of the original structure of the mass, 40% of the original structure is examined and reserved in the embodiment, and the spatial mass distribution under the maximum structural rigidity is solved. The mechanical interface part of the rotary seat and the peripheral parts thereof is set to be reserved, and other areas can be optimized and lightened. The discrete model after the topological optimization is shown in fig. 5, from which the optimal mass distribution and the optimal force transmission path of the rotating seat model under the specific boundary condition constraints and loads can be seen, and the dark part in the figure shows the optimal force transmission path.
(3) And (3) performing reverse three-dimensional space reconstruction on the model: and analyzing the optimal force transmission path of the discrete model under actual constraint and load from the discrete model after the topological design of the rotating seat, and performing reverse three-dimensional reconstruction on the discrete model to obtain a new solid structure of the rotating seat. The reverse reconstruction process needs to consider the requirements of a part post-forming mode, the connection relation of the structure in the whole assembly body, an external mechanical interface, the use working condition, the manufacturability required by production and manufacturing and the like. The optimized model is very complex, the traditional machining is difficult to form, and only casting and additive manufacturing can be realized. The model has an obvious non-equal wall thickness structure, which is not beneficial to the flow of molten metal in casting, and parts are easy to generate holes and shrinkage porosity. Therefore, the method is finally finished by adopting an additive manufacturing mode, such as a 3D printing mode. Additive manufacturing is a novel manufacturing method, although the form is flexible, and can be less bound by the traditional manufacturing process. However, other requirements on the part structure are provided by the process characteristics, such as that the cross section area of the part cannot be changed suddenly, a support structure needs to be added at a proper position according to different parts during manufacturing, and the like, which need to be fully considered in the reverse three-dimensional reconstruction. The three-dimensional reconstructed rotating base model is reversed, as shown in fig. 6.
(4) And carrying out intensity check on the reconstructed model. And (4) checking the strength of the reconstructed new rotating seat structure, applying the same boundary conditions and loads, performing statics simulation analysis, and verifying whether the strength meets the setting of a topological optimization target. The reconstructed model is different from the topological design discrete model, the boundary conditions and loads in the step 1) are applied to the model after the rotating base topology optimization, as shown in fig. 7, the static simulation check is carried out, and the stress distribution cloud chart is shown in fig. 8. The optimized rotating seat has the model mass of 3.90352kg and the maximum strain of 0.23065 MPa. Compared with the original model, the model after the topological optimization design has the advantages that the stress is increased by 4.8 percent, the mass is only 61 percent of the original mass, the initially set optimization target is completely met (the stress changes by no more than +/-10 percent compared with the original structure, and the weight is reduced by more than 30 percent), and the effects of small strength change and great weight reduction are achieved.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (3)
1. A topology design method of a rotating base of a rotating accelerometer type gravity gradient measuring device is characterized in that: which comprises the following steps:
(1) carrying out simulation analysis on the original rotating base model to know the stress distribution characteristics of the original rotating base model: analyzing the actual working condition of the rotating seat, abstracting to boundary constraint and applying load to the rotating seat model, and performing statics simulation analysis to obtain the stress distribution and the maximum stress of the original rotating seat model under the actual working condition;
(2) carrying out topology optimization design on the rotating base model: setting constraint limits of a rotating seat model, an optimized weight reduction area and a reserved area of the model, setting a topological optimization target and a convergence criterion, and obtaining a rotating seat topological optimization result: the optimization target is set to be 3-040% of the original structure of the mass, the spatial mass distribution under the maximum structural rigidity is solved, the mechanical interface parts of the rotating seat and peripheral parts of the rotating seat are set to be reserved, and other areas can be optimized and lightened to obtain a discrete model;
(3) and (3) performing reverse three-dimensional space reconstruction on the rotating base model: analyzing the optimal force transmission path of the discrete model under actual constraint and load from the discrete model after the topological design of the rotating base, and performing reverse three-dimensional reconstruction on the discrete model to obtain a reconstructed rotating base model structure;
(4) and (3) carrying out strength check on the reconstructed rotating base model: and (4) checking the strength of the reconstructed rotating base model, applying the same boundary conditions and loads, performing statics simulation analysis, and verifying whether the strength meets the setting of a topological optimization target.
2. The method for designing the topology of the rotating base of the rotating accelerometer type gravity gradient measuring device according to claim 1, wherein the method comprises the following steps: in the step 1), the original rotating seat model is necessarily simplified, and only one eighth of the rotating seat model is needed to be analyzed in consideration of the fact that the rotating seat model is of a periodically symmetrical structure; the topological optimization design in the step 2) is also an eighth discrete model.
3. The method for designing the topology of the rotating base of the rotating accelerometer type gravity gradient measuring device according to claim 1, wherein the method comprises the following steps: in the step 1), the gravity of the rotating seat and the meter installing and adjusting mechanism is equivalent to a far-end force which is applied to the installation surface of the original rotating seat model installing and adjusting mechanism, and the action point of the far-end force is located at the equivalent mass center of the installing and adjusting mechanism; the centrifugal force of the surface mounting and adjusting mechanism is equivalent to normal force with the same size, and acts on the mounting surface of the original rotating seat model mounting and adjusting mechanism, and the direction is along the normal direction of the mounting surface; and applying fixed constraint to the upper surface and the lower surface of the model to simulate the action of shafting at two ends of the GGI on the rotating seat.
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