CN110955988B - Modeling method for solving dynamics characteristics of hanging ejection mechanism by ADAMS - Google Patents
Modeling method for solving dynamics characteristics of hanging ejection mechanism by ADAMS Download PDFInfo
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- CN110955988B CN110955988B CN201911051067.7A CN201911051067A CN110955988B CN 110955988 B CN110955988 B CN 110955988B CN 201911051067 A CN201911051067 A CN 201911051067A CN 110955988 B CN110955988 B CN 110955988B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- 239000000725 suspension Substances 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 230000010076 replication Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention belongs to the field of simulation calculation and research of dynamic characteristics of an airborne suspension ejection mechanism, and relates to a modeling method for solving the dynamic characteristics of the suspension ejection mechanism by using ADAMS. According to the structural characteristics of the hanging ejection mechanism and the dynamic characteristics in the actual working conditions, the method reasonably and effectively processes the attribute and the constraint relation of the steel ball. The original rigid-flexible coupling contact is converted into the just coupling contact, and the contact between the steel ball and the suspension joint is converted into the moving pair and the ball twisted pair, so that the number of contact pairs is reduced, the simulation operation time is greatly shortened, the simulation efficiency of the suspension ejection mechanism is improved, and the suspension ejection mechanism has high engineering application value.
Description
Technical Field
The invention belongs to the field of simulation calculation and research of dynamic characteristics of an airborne suspension ejection mechanism, and relates to a modeling method for solving the dynamic characteristics of the suspension ejection mechanism by using ADAMS.
Background
The hanging ejection mechanism is an important functional component of the rotary throwing type airborne suspension device. The hanging ejection mechanism realizes the connection and main bearing function of the aircraft and the hanging device in a hanging state. Under an emergency state, the hanging ejection mechanism realizes the safe separation of the aircraft and the hanging device under the action of high-pressure gas. The hanging ejection mechanism mainly comprises a hanging connector, a steel ball and a piston. The steel ball realizes the locking of the hanging joint and the hanging joint, and ensures the hanging function of the hanging ejection mechanism; the piston moves under the action of high-pressure gas to release the locking of the steel ball, so that the throwing function of the hanging ejection mechanism is realized. The statics characteristic analysis of the hanging ejection mechanism is relatively simple, the strong rigidity index parameters of each part can be effectively predicted, but the transient instability of the steel ball lock cannot be analyzed, and the dynamic performance of the hanging ejection mechanism cannot be completely described. The dynamic characteristic analysis can effectively analyze the stability of the hanging ejection mechanism under the impact vibration environment in the hanging state, and can more accurately describe the dynamic performance of the hanging ejection mechanism in the throwing state.
Along with the rapid development of computer technology, the application of multi-body dynamics simulation software ADAMS to analyze the dynamics characteristics of a hanging ejection mechanism has become an important means. The hanging ejection mechanism is used as a main bearing part, the steel ball has certain deformation, and a plurality of contacts exist between the steel ball and a hanging joint, between the steel ball and a hanging joint and between the steel ball and a piston at any instant. During initial unlocking, the steel ball moves in the ball groove of the suspension joint and rotates around the mass center of the steel ball. Therefore, the hanging ejection mechanism integrates the complex contact problems of multi-body contact, friction, rolling, sliding, material nonlinearity, geometric nonlinearity and boundary nonlinearity. However, in the ADAMS-based modeling process, the steel ball is treated as a flexible body, and a constraint relation between the steel ball and a hanging joint, between the steel ball and the hanging joint and between the steel ball and a hanging and between the steel ball and a piston is established by creating a contact force, so that the calculation amount is large, the operation efficiency is low and the simulation precision is not high due to the contact force among a plurality of rigid-flexible coupling models in the model.
Disclosure of Invention
The invention aims to provide a modeling method for solving dynamic characteristics of a hanging ejection mechanism by using ADAMS.
The technical scheme of the invention is as follows: a modeling method for solving dynamic characteristics of a hanging ejection mechanism by ADAMS is characterized by comprising the following steps:
1) In a three-dimensional modeling software environment, carrying out three-dimensional modeling on the parts of the hanging ejection mechanism;
2) The three-dimensional model is imported into ADAMS software, preprocessing is carried out on the simulation model, and materials of all parts, constraint pairs among all parts and contact force are added;
step 2) the constraint pair comprises: and adding a moving pair between the mass center of each steel ball and the suspension joint.
Step 2) the contact force comprises: and adding rigid-rigid contact force between each steel ball and the hanging joint and between each steel ball and the piston.
3) And copying the same steel ball at each steel ball, adding a constraint pair between the steel balls, and processing the attribute of each steel ball.
Step 3) the constraint pair comprises: and adding a ball twisted pair between each original steel ball centroid and the corresponding duplicate steel ball centroid.
The step 3) of processing the original steel ball attribute comprises the following steps: the quality attribute density parameter of each original steel ball is modified to be 1 per mill or less so that the quality of the original steel ball is close to zero but cannot be equal to zero.
The step 3) of processing the attribute of the copying steel ball comprises the following steps: each replication steel ball is converted into a flexible body.
The duplication steel ball is positioned at the original steel ball, the quality attribute is consistent with that of the original steel ball, and the constraint relation of the original steel ball is not duplicated.
The steel ball flexible body can be generated through finite element software conversion, and can also be automatically generated through ADAMS.
The invention has the beneficial effects that the attribute and the constraint relation of the steel ball are reasonably and effectively processed according to the structural characteristics of the hanging ejection mechanism and the dynamic characteristics in the actual working condition. The original rigid-flexible coupling contact is converted into the just coupling contact, and the contact between the steel ball and the suspension joint is converted into the moving pair and the ball twisted pair, so that the number of contact pairs is reduced, the simulation operation time is greatly shortened, the simulation efficiency of the suspension ejection mechanism is improved, and the suspension ejection mechanism has high engineering application value.
Drawings
FIG. 1 is a schematic view of a hanging ejection mechanism of the present invention;
FIG. 2 is a cross-sectional view of section A-A of FIG. 1;
fig. 3 is a steel ball model diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings, but the invention is not limited thereto.
1) And (3) carrying out three-dimensional modeling on the parts of the hanging ejection mechanism in the SolidWorks software environment. The hanging ejection mechanism comprises a hanging connector 1, a hanging connector 2, a piston 3 and a steel ball 4, as shown in figures 1 and 2.
2) The three-dimensional model is imported into ADAMS software, pretreatment is carried out on the simulation model, and all parts are added with steel, and constraint pairs and contact force among all the parts are added.
Step 2) the constraint pair comprises: a pair of movements between the centre of mass of each steel ball 4 and the suspension joint 2 is added.
Step 2) the contact force comprises: and adding rigid-rigid contact force between each steel ball 4 and the hanging joint 1 and between each steel ball 4 and the piston 3.
3) At each steel ball 4 the same one steel ball 5 is replicated, as shown in fig. 3. And adding constraint pairs among the steel balls, and processing the attribute of each steel ball.
Step 3) the constraint pair comprises: and adding a ball twisted pair between the mass center of each original steel ball 4 and the mass center of the corresponding duplication steel ball 5.
The step 3) of processing the properties of the raw steel ball 4 comprises the following steps: the quality attribute density parameter of each raw steel ball 4 is modified to be 1 per mill, so that the quality of the raw steel ball is close to zero but not equal to zero.
The step 3) of processing the attribute of the copying steel ball 5 comprises the following steps: a flexible body of each replication steel ball 5 is automatically generated by ADAMS and each replication steel ball 5 is replaced by a flexible body.
Claims (7)
1. A modeling method for solving dynamic characteristics of a hanging ejection mechanism by ADAMS is characterized by comprising the following steps:
1) In a three-dimensional modeling software environment, carrying out three-dimensional modeling on parts of a hanging ejection mechanism, wherein the hanging ejection mechanism comprises a hanging connector 1, a hanging connector 2, a piston 3 and a plurality of steel balls 4;
2) The three-dimensional model is imported into ADAMS software, preprocessing is carried out on the simulation model, and materials of all parts, constraint pairs among all parts and contact force are added;
3) The same steel ball is duplicated at each steel ball, a constraint pair is added between the steel balls, and the quality attribute density parameter of each original steel ball is modified to be 1 per mill or less so that the quality of the original steel ball is close to zero but cannot be equal to zero.
2. The modeling method for solving a dynamics of a hanging ejection mechanism using ADAMS according to claim 1, wherein said step 2) said constraint pair comprises: and adding a moving pair between the mass center of each steel ball and the suspension joint.
3. The modeling method for solving a kinetic property of a hanging ejection mechanism by ADAMS according to claim 1, wherein said step 2) said contact force comprises: and adding rigid-rigid contact force between each steel ball and the hanging joint and between each steel ball and the piston.
4. The modeling method for solving a dynamic characteristic of a hanging ejection mechanism by ADAMS according to claim 1, wherein said step 3) said constraint pair comprises: and adding a ball twisted pair between each original steel ball centroid and the corresponding duplicate steel ball centroid.
5. The modeling method for solving the dynamics of the hanging ejection mechanism by using ADAMS according to claim 1, wherein the step 3) of processing the properties of the duplicated steel balls comprises: each replicated steel ball is converted into a flexible body of steel balls.
6. The modeling method for solving the dynamics of the hanging ejection mechanism by using ADAMS according to claim 5, wherein the replication steel ball is positioned at the original steel ball, the quality attribute is consistent with the original steel ball, and the constraint relation of the original steel ball is not replicated.
7. The modeling method for solving the dynamics of the hanging ejection mechanism by using ADAMS according to claim 5, wherein the steel ball flexible body can be generated by finite element software conversion or can be generated automatically by ADAMS.
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| CN110955988B true CN110955988B (en) | 2024-04-02 |
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