CN109033728A - A kind of quasi-flexible body discretization suspension modeling method of based liner - Google Patents
A kind of quasi-flexible body discretization suspension modeling method of based liner Download PDFInfo
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Abstract
The invention discloses a kind of quasi-flexible body discretization suspension modeling methods of based liner, are related to automotive suspension technical field, and by establishing suspension rigid body part model, the model for needing flexibility to handle is divided into the Stiff Block of several mass concentrations；Stiff Block is connected with bushing, the rigidity of model that approximate substitution wants flexibility to handle is come with bushing rigidity, in this, as load-carrying unit；Input rigid body model parameter；Dynamic suspension system of vehicles simulation analysis is carried out, simulation result is exported.Compared with modal synthesis method flexible object modeling method, there is stronger parametric modeling ability and modeling simplicity；It is higher to the simulation accuracy of sheet parts compared with flexible discretization method, and since each freedom degree of bushing is independent of each other, so the occurrence of can effectively avoid shear locking when carrying out discrete to rigid element using it.In addition, by the setting to bushing rigidity, expected simulation optimization is obtained as a result, to directive function from when optimizing to model.
Description
Technical field
The invention belongs to automotive suspension technical field more particularly to a kind of quasi-flexible body discretization suspensions of based liner
Modeling method.
Background technique
Coupling System of Flexible Structures And Rigid Body dynamics refers to when influence of the object deformation to movement can't be ignored in multi-body system, uses
Flexible multi-body model substitutes rigid model, and considers the Flexible Multibody System Dynamics of friction, mainly studies soft
Property body deformation its a wide range of spatial movement between interaction or intercouple and this coupling caused by dynamics
Effect.With the development of national economy and defense technology, for many engineering problems, simple multi-rigid-body system model and reality
It differs greatly, can not meet requirement of engineering precision, it is necessary to while considering component grand movement and component itself and deform and is mutual
Therefore coupling is of great significance to Coupling System of Flexible Structures And Rigid Body Dynamic Modeling research.Currently, in dynamics analysis software
The middle method for establishing flexible body is mainly by following 3 kinds: 1. discrete method, a component is separated into many sections of rigid members, use is soft
Property beam connection；2. automatic flexible method, directly establishes the modal neutral file of flexible body in dynamics software, then uses flexible body
To substitute original rigid body file；3. introducing modal neutral file method, grid dividing and mode meter are carried out using finite element software
After calculation, modal neutral file is obtained, then it is directly read in into dynamics analysis software.Only due to discrete method and automatic flexible method
Suitable for the relatively simple component of structure, so, in the engineering part more complicated for planform in practice, usually with having
Finite element analysis software establishes flexible body, but redesigns model simultaneously as the adjustment repeatedly of hard spot improves in the design primary stage
The foundation for completing flexible body will be a very time-consuming job, inconvenient, inefficiency, it is difficult to meet the practical need of engineering
It asks.It a kind of is hanged in view of the above-mentioned problems, proposing using bushing come the quasi- discretization method simulated to thin plate class unit
Frame modeling.
Summary of the invention
The present invention is to solve efficiently, accurately establish suspension Rigid-flexible Coupling Dynamics simulation model in existing technologies,
Propose a kind of quasi- discretization method progress suspension modeling simulated using bushing to thin plate class unit.The modeling method
It is easy to operate, it can quickly and accurately establish the hard and soft lotus root of suspension and close kinetic model, and kinetic model is applied to simulation analysis,
The application attestation modeling method has good application value.
The present invention, which adopts the following technical scheme that, to be achieved:
A kind of quasi-flexible body discretization suspension modeling method of based liner, comprising the following steps:
It models, assemble, get parms and exports: establishing the threedimensional model of each component of suspension in CAD software, and assemble,
Crucial hard spot coordinate, quality, mass center, rotary inertia parameter are measured, then by the three-dimensional without the rigid element of flexibility processing
Model is exported one by one with parasolid format；
Quasi-flexibleization pre-treatment and export: the rigid element for needing flexibility to handle is ordered in CAD software using trim body
It enables and carries out segment processing, then exported one by one with parasolid format；In this step, the component for needing flexibility to handle, after segmentation
It is connected with bushing；
Threedimensional model imports ADAMS_car software and establishes multi-body Dynamics Model: in ADAMS_car template modeling module
The general component for establishing each component of suspension, after without the threedimensional model of the rigid element of flexibility processing and cutting section processing
The threedimensional model of rigid element for needing flexibility to handle import ADAMS_car software, and the general component one with foundation
One is corresponding, applies constraint, bushing, constructs suspension parameter and communicator；
It edits bushing rigidity: editing bushing rigidity according to actual needs；
Emulation: emulation is opened.
Further, cutting section method are as follows: the part with other rigid element face contacts, due to the pact of rigidity dignity
Beam, deflection is less, can be divided into one piece, not refine；Not with the part of other rigid element face contacts, deflection is larger, more
Piecemeal, it is uniform in the hope of deflection.
Further, kinetic model foundation includes the following steps:
Firstly, establishing general component in the template modeling module of ADAMS_car；Then, it is imported for the general component of foundation
Geometric shape determines corresponding position；Quality, mass center, rotary inertia are calculated according to geometric shape and material properties；Finally give each portion
Addition constraint pair, bushing, establish suspension parameter and input and output communicator between part.
Further, established model and suspension twin columns testing stand are assembled, simulation time and step-length is set, setting is imitative
True time and step-length.
Further, it edits in bushing rigidity, bushing rigidity is approximate with the practical stiffness of three-dimensional part.
Further, with the discretization rigid body part after bushing connection cutting, bushing link position is chosen, editor's bushing is each
Directional stiffness.
Further, it according to simulation result, discriminates whether to need to carry out model parameter modification, if desired carries out quasi-flexible body
Parameter modification then returns to editor's bushing rigidity step, if desired carries out the modification of rigid body parameter and then returns to threedimensional model modeling procedure
It modifies to parameter, if not needing to carry out parameter modification, exports simulation result and save data file.
Above technical scheme has the advantage that
Compared with modal synthesis method flexible object modeling method, there is stronger parametric modeling ability and modeling simplicity；
It is higher to the simulation accuracy of sheet parts compared with flexible discretization method, and mutually not due to each freedom degree of bushing
It influences, so the occurrence of can effectively avoid shear locking when carrying out discrete to rigid element using it.It improves
Modeling efficiency and accuracy have good engineering application value.
The present invention obtains simulation optimization as a result, to optimize to the parameter of model by the setting to bushing rigidity
Directive function is chosen.
The parametric modeling method of Rigid-flexible Coupling Model of the invention has carried out reality in certain model bus simulation optimization
Example application, the application attestation modeling method have good application value.
Detailed description of the invention
Fig. 1 be the present invention relates to a kind of based liner quasi-flexible body discretization suspension modeling method flow chart；
Fig. 2 is that the present embodiments relate to the bus rear suspension Dynamics Simulation Model figures arrived.
Appended drawing reference is as follows:
It is connected after the segmentation of 1- single leaf spring with bushing, 2- vehicle frame, 3- distance rod assembly, is propped up on 4- air spring
Frame, 5- damper upper bracket, 6- damper, 7- air spring, 8- air spring lower bracket, 9- lower support of shock absorber are horizontal under 10-
Beam, 11- twin columns testing stand, 12- vehicle bridge.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but a specific embodiment of the invention is without being limited thereto.
In conjunction with attached drawing 2, a kind of quasi-flexible body discretization suspension modeling method of based liner, which is characterized in that including with
Lower step:
It models, assemble, get parms and exports: establishing the threedimensional model of each component of suspension in CAD software, and assemble,
Crucial hard spot coordinate, quality, mass center, rotary inertia parameter are measured, then by the three-dimensional without the rigid element of flexibility processing
Model is exported one by one with parasolid format；
Quasi-flexibleization pre-treatment and export: the rigid element for needing flexibility to handle carries out cutting section in CAD software
Method is handled, then is exported one by one with parasolid format；In this step, the component for needing flexibility to handle, is used after segmentation
Bushing connection；
Threedimensional model imports ADAMS_car software and establishes multi-body Dynamics Model；In ADAMS_car template modeling module
The general component (general part) for establishing each component of suspension, will without flexibility processing rigid element threedimensional model with
The threedimensional model of the cutting section rigid element that treated needs flexibility to handle imports ADAMS_car software, and with build
Vertical general component corresponds, and applies constraint, bushing, constructs suspension parameter and communicator；
It edits bushing rigidity: editing bushing rigidity according to actual needs；
Emulation: emulation is opened.Established model and suspension twin columns testing stand are assembled, simulation time and step-length are set,
Simulation time and step-length are set.According to simulation result, discriminates whether to need to carry out model parameter modification, if desired carry out quasi-flexible
The modification of body parameter then returns to editor's bushing rigidity step, if desired carries out the modification of rigid body parameter and then returns to threedimensional model modeling step
Suddenly it modifies to parameter, if not needing to carry out parameter modification, exports simulation result and save data file.
Cutting section method are as follows: the part with other rigid element face contacts, due to rigidity dignity constraint, deflection compared with
It is few, one piece can be divided into, do not refined；Not with the part of other rigid element face contacts, deflection is larger, more piecemeals, in the hope of becoming
Shape amount is uniform.Emulation include the following steps: firstly, ADAMS_car template modeling module, establish general component；Then, it is
The general component established imports geometric shape, determines corresponding position；According to geometric shape and material properties calculate quality, mass center,
Rotary inertia；The finally secondary, bushing to addition constraint between each component, establishes suspension parameter and input and output communicator.
The modeling method has stronger parametric modeling ability and builds compared with modal synthesis method flexible object modeling method
Mould simplicity；It is higher to the simulation accuracy of sheet parts compared with flexible discretization method, and due to bushing it is each from
It is independent of each other by degree, so can effectively avoid the hair of shear locking situation when carrying out discrete to rigid element using it
It is raw.In addition, obtaining expected simulation optimization as a result, to when optimizing to model by the setting to bushing rigidity
Play directive function.
Embodiment 1
In conjunction with shown in attached Fig. 1 and 2, the present embodiment includes the following steps:
Step 1 models certain model 8.5t rear suspension by CAD software, such as UG, suspension each section according to one
Fixed assembly relation is built up；
The step is mainly ensured that the accurate rigging position of each component, opposite to import each component in ADAMS_car
The definition of position；
Step 2 is not to be regarded as rigid body since 1 deflection of single leaf spring is larger, after cutting section, then with
The export of parasolid format, other all part distortion amounts in addition to leaf spring are small, can be neglected, therefore can be considered rigid
Property body component, directly with parasolid format export；
Leaf spring is mainly divided into 16 pieces with trimming body method in UG by the step, wherein with air bag lower bracket and subtracting
The part that vibration device lower bracket 9 contacts is as one piece, and as one piece, rest part is divided into 14 for the part contacted with upper and lower cover plates
Block, then with the export of parasolid format；
Step 3 is established general component (general part) in the modeling of ADAMS_car template, is imported CAD software and is led
The general component of geometric shape and foundation out corresponds, the single leaf spring 1 after having segmentation respectively, vehicle frame 2, thrust
Bar assembly 3, air spring upper bracket 4, damper upper bracket 5, air spring lower bracket 8, lower support of shock absorber 9, lower beam 10,
Vehicle bridge 12.Then damper 6 and helical spring are established in ADAMS_car template modeling module, then switches to ADAMS_car's
Helical spring is substituted for air spring 7, and establishes twin columns testing stand 11 by standard interface.The step mainly defines general portion
The position of part defines general component as location information using the corresponding geometric shape center-of-mass coordinate of the general component established
Position.Each component mass center measures in UG software.Corresponding one will also be established for 16 mass blocks divided in step 2
As component (general part)；
Step 4, edits the quality of rigid element, and mass center and rotary inertia (can pass through system-computed geometric shape and material
Gain of parameter), auxiliary connection, bushing are applied to suspension rigid element model, construct suspension parameter, establishes suspension output incoming traffic
Device；
Step 5, discreet component are connected with bushing, carry out approximate substitution rigidity of model with bushing rigidity, in this, as carrying member
Part；
Before defining bushing, hard spot coordinate first is established in the installation place of each bushing, bushing is facilitated to define position, coordinate
Information measures in UG software.
Step 6 edits bushing rigidity, according to actual needs to reach approximate with practical stiffness；
Step 7 opens emulation, obtains simulation result, can be fine by taking certain model 8.5t rear suspension as an example with this method
Complete emulation.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not
In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement
Or modification all belongs to the scope of protection of the present invention.
Claims (7)
1. a kind of quasi-flexible body discretization suspension modeling method of based liner, which comprises the following steps:
It models, assemble, get parms and exports: establishing the threedimensional model of each component of suspension in CAD software, and assemble, measure
Crucial hard spot coordinate, quality, mass center, rotary inertia parameter, then by the threedimensional model without the rigid element of flexibility processing
It is exported one by one with parasolid format；
Quasi-flexibleization pre-treatment and export: need flexibility handle rigid element, in CAD software using trim body order into
Row segment processing, then exported one by one with parasolid format；In this step, the component for needing flexibility to handle, with lining after segmentation
Set connection；
Threedimensional model imports ADAMS_car software and establishes multi-body Dynamics Model: establishing in ADAMS_car template modeling module
The general component of each component of suspension, will without flexibility processing rigid element threedimensional model and cutting section treated need
The threedimensional model for the rigid element for wanting flexibility to handle imports ADAMS_car software, and a pair of with the general component of foundation one
It answers, applies constraint, bushing, construct suspension parameter and communicator；
It edits bushing rigidity: editing bushing rigidity according to actual needs；
Emulation: established model and suspension twin columns testing stand are assembled, and simulation time and step-length is arranged, and open emulation.
2. the quasi-flexible body discretization suspension modeling method of based liner according to claim 1, which is characterized in that cutting
Segment processing method are as follows: the part with other rigid element face contacts, due to the constraint of rigidity dignity, deflection is less, can divide
It is one piece, does not refine；Not with the part of other rigid element face contacts, deflection is big, more piecemeals, uniform in the hope of deflection.
3. the quasi-flexible body discretization suspension modeling method of based liner according to claim 1, which is characterized in that power
Model foundation is learned to include the following steps:
Firstly, establishing general component in the template modeling module of ADAMS_car；Then, geometry is imported for the general component of foundation
Shape determines corresponding position；Quality, mass center, inertia are calculated according to geometric shape and material properties；Finally to adding between each component
Constraint pair, bushing, establish suspension parameter and input and output communicator.
4. the quasi-flexible body discretization suspension modeling method of based liner according to claim 1, which is characterized in that will build
The model and suspension twin columns testing stand stood assembles, and simulation time and step-length is arranged.
5. the quasi-flexible body discretization suspension modeling method of based liner according to claim 1, which is characterized in that editor
Bushing rigidity, bushing rigidity are approximate with the practical stiffness of three-dimensional part.
6. the quasi-flexible body discretization suspension modeling method of based liner according to claim 1, which is characterized in that with lining
Discretization rigid body part after set connection cutting, chooses bushing link position, edits bushing all directions rigidity.
7. the quasi-flexible body discretization suspension modeling method of based liner according to claim 1, which is characterized in that according to
Simulation result discriminates whether to need to carry out model parameter modification, if desired carries out quasi-flexible body parameter modification and then returns to editor's lining
Rigidity step is covered, if desired progress rigid body parameter modification then returns to threedimensional model modeling procedure and modifies to parameter, if not
It needs to carry out parameter modification, then exports simulation result and save data file.
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| CN110489857A (en) * | 2019-08-16 | 2019-11-22 | 北京航天发射技术研究所 | A kind of modeling and simulating method, system terminal and the storage medium of multi-dot hydraulic pressure bearing system |
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| CN111597743A (en) * | 2020-04-20 | 2020-08-28 | 中国第一汽车股份有限公司 | Durability analysis method, device and equipment for vehicle door opening and closing and storage medium |
| CN112861402A (en) * | 2021-02-05 | 2021-05-28 | 西藏宁算科技集团有限公司 | Flexible suspension model and modeling method thereof |
| CN113312703A (en) * | 2021-05-27 | 2021-08-27 | 奇瑞汽车股份有限公司 | Simulation method and device for automobile bushing and computer storage medium |
| CN113515874A (en) * | 2021-07-12 | 2021-10-19 | 南京航空航天大学 | Whole vehicle multi-body dynamic study vehicle modeling method considering vehicle body flexibility |
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| CN113312703B (en) * | 2021-05-27 | 2022-12-30 | 奇瑞汽车股份有限公司 | Simulation method and device for automobile bushing and computer storage medium |
| CN113515874A (en) * | 2021-07-12 | 2021-10-19 | 南京航空航天大学 | Whole vehicle multi-body dynamic study vehicle modeling method considering vehicle body flexibility |
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