CN113591213B - Durability analysis method for novel door lock body of light commercial vehicle - Google Patents
Durability analysis method for novel door lock body of light commercial vehicle Download PDFInfo
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- CN113591213B CN113591213B CN202110800953.6A CN202110800953A CN113591213B CN 113591213 B CN113591213 B CN 113591213B CN 202110800953 A CN202110800953 A CN 202110800953A CN 113591213 B CN113591213 B CN 113591213B
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- 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
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/04—Ageing analysis or optimisation against ageing
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Abstract
The invention discloses a method for analyzing durability of a novel door lock body of a light commercial vehicle, which comprises the following steps: 1) Obtaining a model of a door lock body mechanism to be analyzed, and judging whether the door lock mechanism meets locking and locking functions in theory; 2) Establishing a three-dimensional model of a door lock body transmission mechanism; 3) Establishing a motion simulation model of the lock body mechanism, and judging whether the door lock mechanism meets the locking and locking functions or not through the motion simulation model; 4) CAE simulation pretreatment; 5) CAE simulation solving and post-processing; 6) Importing the stress condition result file of the calculated lock body model into a durable simulation module, constructing a fatigue analysis flow, and calculating the service life; 7) And evaluating the fatigue strength of the door lock body according to the simulation result. The method can effectively improve the design efficiency of the automobile door lock body.
Description
Technical Field
The invention relates to an automobile door lock body, in particular to a method for analyzing durability of a novel door lock body of a light commercial automobile.
Background
The door lock of the automobile is a special component which integrates safety, decoration and manufacturability into a whole. At present, the coordination and development of a door lock and the whole automobile are very important for a plurality of automobile major countries such as the united states, the daily, the European and the like in the world. Automobile parts are an important component of the automobile market, and automobile door locks are being developed to a great extent as key parts of automobiles. As one of the most critical performance components of the automobile door system, the automobile door lock can realize the theft prevention and the locking of the automobile door lock, and meanwhile, as a critical component in the whole automobile accessory, the performance of the door lock mechanism directly influences the personal safety of passengers.
A light commercial vehicle is generally a cargo vehicle having at least four wheels and a maximum total mass of not more than 3.5 t. The novel door lock body is a novel mechanism integrating a door lock locking mechanism and a locking mechanism. Durability refers to the ability of a product to be used for extended periods of time without failure.
At present, the light commercial vehicle gradually starts to use an integrated door lock, and a locking mechanism are integrated together, so that the installation volume and the quality of a lock body are greatly reduced. The domestic method for verifying the durability of the automobile door lock body generally adopts an opening and closing endurance test after assembly to verify whether the fatigue strength of the automobile door lock body meets the requirement. The automobile door lock has the defects that the development period is increased, once the structure of the door lock body is verified to be unsatisfied with the requirement through the test, the design is needed again, the development period is prolonged, and whether the fatigue strength meets the requirement or not is verified through the test every time the automobile door lock body is designed, so that the efficiency is lower.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel method for analyzing the durability of a door lock body of a light commercial vehicle aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows: a durability analysis method for a novel door lock body of a light commercial vehicle comprises the following steps:
1) Acquiring a three-dimensional model of a door lock body mechanism to be analyzed, establishing a motion chain of the door lock body mechanism according to functions according to the model, and deducing a kinematics equation and a kinetic equation of the door lock body mechanism; judging whether the door lock mechanism meets the locking and locking functions or not in theory according to the kinematics and the kinetic equation of the lock body mechanism;
2) Establishing a three-dimensional model of a door lock body transmission mechanism according to the three-dimensional model in the step 1), and setting the matching relation of all components in the transmission mechanism;
3) Importing the three-dimensional model of the component built in the step 2) into simulation software to obtain a motion simulation model of the lock body mechanism, and judging whether the door lock mechanism meets locking and locking functions or not through the motion simulation model;
4) CAE simulation pretreatment: obtaining the loading condition of each component in a motion simulation model of a lock body mechanism through a dynamic equation, importing the motion simulation model of the door lock body into finite element analysis software, dividing grids, and setting material parameters, contact relation, kinematic pair form, load and boundary conditions;
5) CAE simulation solving and post-processing: calculating stress conditions of the door lock body model after pretreatment by finite element analysis software, and carrying out simulation analysis on different motion chains to obtain simulation data of load changes of each component in the motion process;
6) The dynamic equation is used for verifying the simulation data of the load change of each component, and if the simulation data does not accord with the theoretically deduced stress relation, boundary conditions in the stress simulation pretreatment are optimized until the simulation data accord with the theoretically deduced stress relation;
7) Importing the stress condition result file of the calculated lock body model into a durable simulation module, constructing a fatigue analysis flow, and calculating the service life;
8) And (3) reasonably evaluating the door lock body according to the simulation result, and if the fatigue strength of the result does not meet the requirement, performing material optimization and load optimization and then transferring to the step (1) until the simulation result meets the actual requirement.
According to the above scheme, the three-dimensional model of the door lock body transmission mechanism established in the step 2) is a three-dimensional model of a member comprising a clamping plate, a clamping jaw, a shell, a bottom plate, an unlocking connecting rod, a locking gear, an inner locking arm and an outer locking arm.
According to the above scheme, in the step 3), whether the door lock mechanism meets the locking and locking functions is judged through the motion simulation model, the motion simulation model is simplified, and the motion simulation model is decomposed into the following multiple motion chains: the manual locking kinematic chain, the electric control locking kinematic chain, the key locking kinematic chain, the outer handle opening kinematic chain and the inner handle opening kinematic chain are subjected to simulation analysis aiming at different kinematic chains.
According to the above scheme, the step 4) includes simplifying the component model before grid division, including eliminating fillets and simplifying complex curved surfaces.
According to the above scheme, the material parameters, the contact relation, the kinematic pair form, the load and the boundary conditions set in the step 4) are specifically as follows:
the material parameters include density, poisson ratio, elastic modulus, fatigue curve, yield strength and tensile strength of the material;
the contact relation is set according to analysis of a kinematic chain, and comprises friction-free contact, friction contact and fixed constraint;
the kinematic pair comprises a revolute pair, a movable pair, a gear transmission and a cam mechanism;
the load setting comprises the setting of motor input torque, torsion spring torque, acting force and resistance between components;
the boundary condition settings include load conditions, displacement constraints, inertial conditions.
The invention has the beneficial effects that:
1. according to the method, the process of repeatedly manufacturing the sample for testing can be omitted through durability simulation analysis, and the design period and the design cost of the automobile door lock body can be reduced.
2. According to the method, the service life of the automobile door lock body can be predicted according to the simulation result through durability simulation analysis, and the structure of the automobile door lock body can be optimally designed according to the demand level.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a method for analyzing durability of a novel door lock body of a light commercial vehicle comprises the following steps:
1) Acquiring a three-dimensional model of a door lock body mechanism to be analyzed, establishing a motion chain of the door lock body mechanism according to functions according to the model, and deducing a kinematics equation and a kinetic equation of the door lock body mechanism; judging whether the door lock mechanism meets the locking and locking functions or not in theory according to the kinematics and the kinetic equation of the lock body mechanism; the three-dimensional model obtained in the step 1) is converted into a theoretical model, wherein the theoretical model is a complete door lock body model and comprises all parts of a door lock body, a lock catch and a pull wire;
2) Establishing a model of a door lock body transmission mechanism according to the three-dimensional model in the step 1): establishing a three-dimensional model comprising a clamping plate, a claw, a shell, a bottom plate, an opening connecting rod, a locking gear, an inner locking arm, an outer locking arm and other components, and setting a matching relationship; comprises a transmission mechanism only, and a component which needs to consider durability;
3) The three-dimensional model of the component built in the step 2) is imported into simulation software to obtain a motion simulation model of the lock body mechanism, the motion simulation model of the complex lock body mechanism is decomposed into a plurality of motion chains, namely a manual locking motion chain, an electric control locking motion chain, a key locking motion chain, an outer handle opening motion chain and an inner handle opening motion chain, motion simulation analysis is carried out on different motion chains, simplification of the motion simulation model is achieved, the motion condition of each motion chain of the lock body is obtained, and finally, the door lock mechanism can meet the locking and locking functions from the simulation analysis angle.
4) CAE simulation pretreatment: the method comprises the steps of importing a door lock body model into Hypermesh or Ansa finite element analysis software to carry out grid division, and then importing Ansys Workbench to set material parameters, contact relation, kinematic pair form, load and boundary conditions; simplifying the model before grid division, such as eliminating fillets, simplifying complex curved surfaces and the like;
the method comprises the following steps:
the material parameters include density, poisson ratio, elastic modulus, fatigue curve, yield strength and tensile strength of the material;
the contact relation is set according to analysis of a kinematic chain, and comprises friction-free contact, friction contact and fixed constraint;
the kinematic pair comprises a revolute pair, a movable pair, a gear transmission and a cam mechanism;
the load setting comprises the setting of motor input torque, torsion spring torque, acting force and resistance between components;
the boundary condition settings include load conditions, displacement constraints, inertial conditions.
5) CAE simulation solving and post-processing: calculating the stress condition of the lock body model through finite element analysis software, and obtaining simulation data of the load change of each component in the motion process;
6) Importing a stress condition result file of the calculated lock body model into an nCode endurance simulation module, and building a fatigue analysis flow, wherein if the material fatigue curve is unknown, a rough fatigue curve of the material is obtained through a fatigue curve estimation function of simulation software, and the estimated curve is corrected through a correction function; then, calculating the service life;
7) And (3) reasonably evaluating the door lock body according to the simulation result, if the fatigue strength of the result is not reasonable, performing material optimization, and performing load optimization through structure adjustment, and then transferring to the step 1) until the simulation result meets the actual requirement. Load optimization such as worm gear related parameter changes, rod length thickness changes or other structural adjustments.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. The durability analysis method for the novel door lock body of the light commercial vehicle is characterized by comprising the following steps of:
1) Obtaining a three-dimensional model of a door lock body mechanism to be analyzed, and deducing a kinematics and a dynamics equation of the door lock body mechanism according to the model; judging whether the door lock mechanism meets the locking and locking functions or not in theory according to the kinematics and the kinetic equation of the lock body mechanism;
2) Establishing a three-dimensional model of a door lock body transmission mechanism according to the three-dimensional model in the step 1), and setting the matching relation of all components in the transmission mechanism;
3) Importing the three-dimensional model of the component built in the step 2) into simulation software to obtain a motion simulation model of the lock body mechanism, and judging whether the door lock mechanism meets locking and locking functions or not through the motion simulation model;
4) CAE simulation pretreatment: obtaining the loading condition of each component in a motion simulation model of the lock body mechanism through a dynamic equation, importing the motion simulation model of the door lock body into finite element analysis software, dividing grids, and setting material parameters, contact relation, kinematic pair form, load and boundary conditions;
5) CAE simulation solving and post-processing: calculating stress conditions of the door lock body model after pretreatment by finite element analysis software, and carrying out simulation analysis on different motion chains to obtain simulation data of load changes of each component in the motion process;
7) Importing the stress condition result file of the calculated lock body model into a durable simulation module, constructing a fatigue analysis flow, and calculating the service life;
8) And (3) evaluating the fatigue strength of the door lock body according to the simulation result, and if the fatigue strength does not meet the requirement, performing material optimization and load optimization and then transferring to the step (1) until the simulation result meets the actual requirement.
2. The method for analyzing the durability of the novel door lock body of the light commercial vehicle according to claim 1, wherein the three-dimensional model in the step 1) is a complete three-dimensional model of the door lock body, and comprises all parts of the door lock body.
3. The method for analyzing the durability of the novel door lock body of the light commercial vehicle according to claim 1, wherein the step 2) of establishing the three-dimensional model of the door lock body transmission mechanism is to establish the three-dimensional model of the components including the clamping plate, the clamping jaw, the shell, the bottom plate, the unlocking connecting rod, the locking gear, the inner locking arm and the outer locking arm.
4. The method for analyzing the durability of the novel door lock body of the light commercial vehicle according to claim 1, wherein in the step 3), whether the door lock mechanism meets the locking and locking functions is judged through a motion simulation model, the motion simulation model is simplified, and the motion simulation model is decomposed into a plurality of motion chains as follows: the manual locking kinematic chain, the electric control locking kinematic chain, the key locking kinematic chain, the outer handle opening kinematic chain and the inner handle opening kinematic chain are subjected to simulation analysis aiming at different kinematic chains.
5. The method for analyzing the durability of the novel door lock body of the light commercial vehicle according to claim 1, wherein the step 4) includes simplifying the component model before the mesh division, including eliminating the round corners and simplifying the complex curved surfaces.
6. The method for analyzing the durability of the novel door lock body of the light commercial vehicle according to claim 1, wherein the material parameters, the contact relation, the kinematic pair form, the load and the boundary conditions are set in the step 4) as follows:
the material parameters include density, poisson ratio, elastic modulus, fatigue curve, yield strength and tensile strength of the material;
the contact relation is set according to analysis of a kinematic chain, and comprises friction-free contact, friction contact and fixed constraint;
the kinematic pair comprises a revolute pair, a movable pair, a gear transmission and a cam mechanism;
the load setting comprises the setting of motor input torque, torsion spring torque, acting force and resistance between components; the boundary condition settings include load conditions, displacement constraints, inertial conditions.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110800953.6A CN113591213B (en) | 2021-07-15 | 2021-07-15 | Durability analysis method for novel door lock body of light commercial vehicle |
| PCT/CN2021/109035 WO2023284016A1 (en) | 2021-07-15 | 2021-07-28 | Method for analyzing durability of novel door lock body of light commercial vehicle |
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| CN202110800953.6A CN113591213B (en) | 2021-07-15 | 2021-07-15 | Durability analysis method for novel door lock body of light commercial vehicle |
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| CN113591213B true CN113591213B (en) | 2023-11-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116502342B (en) * | 2023-06-28 | 2023-09-01 | 江铃汽车股份有限公司 | Virtual simulation-based automobile engine hood fatigue endurance life prediction method and system |
| CN116910924B (en) * | 2023-09-13 | 2024-01-19 | 天津龙创世纪汽车设计有限公司 | Quick analysis method based on strength of car door trim card seat |
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| JP2017054203A (en) * | 2015-09-07 | 2017-03-16 | エレメンタルデザイン＆コンサルティング株式会社 | Structural design support device and structural design support program |
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2021
- 2021-07-15 CN CN202110800953.6A patent/CN113591213B/en active Active
- 2021-07-28 WO PCT/CN2021/109035 patent/WO2023284016A1/en unknown
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| CN102201016A (en) * | 2010-03-22 | 2011-09-28 | 上海通用汽车有限公司 | Method for modeling and simulating door lock system based on vehicle crash safety |
| CN104236918A (en) * | 2014-08-29 | 2014-12-24 | 北京新能源汽车股份有限公司 | Endurance test device and method for automobile door lock |
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| WO2023284016A1 (en) | 2023-01-19 |
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