ANSYS Motion 2019 R3

ANSYS Motion 2019 R3

ANSYS Motion 2019 R3 | 1.1 Gb

The Ansys product team is pleased to announce the availability of Motion 2019 R3 is a next generation engineering solution based on flexible multibody dynamics. It enables fast and accurate analysis of rigid and flexible bodies within a single solver system.

ANSYS Motion 2019 R3 Release Note

This chapter will introduce new functions in ANSYS Motion 2019 R1/R2/R3.

GearSetForce Displayin Drivetrain
The force vector of gear tooth contact will be displayed on an actual contact face by using Force Display function. Lots of detail behaviors between gear pair can be monitored using the normal and friction force displaying.
Using of GearSetForce Display
In order to display GearSet Force, a pair of gears that is subjected to display must be selected in Assembly Manager before the simulation. Due to the using a "*.uvec" file for displaying vectors, previous simulation result can't be used and the new analysis is required.
User Subroutine for Vector Display (Display Functions)
A force display functions have been developed for a user subroutine and its function name are as follows.'SET_USERDEFINEDVECTOR_FORCE''SET_USERDEFINEDVECTOR_TORQUE'

Cylindrical Roller Bearing
Cylindrical Roller Bearing libraries have been added in Drivetrain. It also supportsthe life cycle and strength based on ISO281 and ISO16281.

GapBushing
Gap Bushing option is available if v-F Spline is used instead of K Coefficientin Bushing Property. Gap Bushing option makes the damping coefficient becomes zero when its stiffness becomes zero during simulation so that damping force is not happened even the relative velocity exist

Pacejka Tire
Pacejka Tireis added in Tire force. Pacejka Tire uses the formulation based on MF Tire/Swift 6.1.2.To use Pacejka Tire, the value of 'PROPERTY_FILE_FORMAT'must be changed to 'pac'in *.tir file.

PCG Solver
A new iteration solver of PCG(Preconditioned Conjugate Gradients) has been developed. PCG solver is generally good for a large scale problem roughly greater than 100,000 D.O.F. The PCG Solver has generally a good scalability on multi-core and multi-CPU computers.
Solving Performance
Several modelshavebeencompared to see the performance. FE Nodal body model is tested.
Limitation of usage
Thecurrent PCG solver has released as a beta version. If non-avialable body is included in the model and PCG solver is checked,the solver type is automatically changed to Sparse solver.
License of PCG solver
During beta testing, you can freely use the solver. When the beta test is finished, this solver will require new license.

Elasto-Hydro Dynamic Bearing
Journal bearing based onEHD (Elasto-Hydro Dynamic) analysis is available in the Drivetrain toolkit. The new function solvesthe Reynolds equation to calculatepressure pattern applied between twosurfacesseparated by lubricationoil. Thewell-known equation for the EHD bearing is simplifiedfrom the Navier-Stokes equation under following assumptions of a Newtonian fluid, thin-film thickness, and laminar flow. The new function supports a cylindrical journal type on the rigid body and flexible body(nodal & modal) except for the EasyFlex bodyas.
Pre & post processor
In order to define EHD bearing, oil properties, surface properties and geometry conditions for both of an action & base body must be defined via EHD Bearing property dialog. EHD Bearing solver calculates pressure pattern using these properties and applies force to the corresponding node ofsurfaces. The pressure pattern will be displayed in the postprocessor.

Soil Interaction
Soil Interaction function is available in the Linkstoolkit. A lot of tracked vehicles are operating not only under the hard ground but also the soft ground which usually called soil. Thoughthe Hertz contact and Coulomb friction approach was enough to represent the hard ground, they were insufficient for the soft soil.Contact formulations of Bekker's normal pressure, Wong's shear stress, and Dynamic sinkageare used to represent the soft soil.
Soil Library
Properties of various soils are supported with the soil library file. Since the library is a text format file, you can modify and use the revised file in the soil modeler. Parameters of normal pressure are taken from the reference of "Theory of Ground Vehicles (J.Y.Wong-3rd)" and the parameters of dynamics sinkage and shear stress have been defined empirically.
Road Data File (RDF)
Since the road can be modeled with the surface on soild or sheet geometry, various road shapes and obstacles can be considered in the driving simulation of the trakced or wheeled vehicle. The "Soil interaction" function generates the RDF file which is used to define the soil property and road shape.

Motor EM Force
In the motorsystem, current around the permanent magnet between rotor and stator generates the electromagnetic force is changed byRPM and their rotation angle.Motor EM Force function can model the forceswhich are appliedon the statorand rotorbodiesin the Drivetrain toolkit. The force should be defined as the UNV file format and the file should contain the force vector and nodal position which are the results and geometry model of ANSYS Maxwell simulation.This function requires other additional data to describe a motor system simply and the more detail information about that is in the preprocessor manual.

Export a Modal body result
Modal Flexible body has been widely used to reduce acomplex flexibility of body intoa small degree offreedom system and it gives highefficiency than the original model.Even its high solving efficiency, expanding usability for the additional simulation such as sound pressure analysis using its surface velocity was limited due to huge output file size. A newapproachhas been proposedto recover the kinematic value. Recovering surface velocity or acceleration by using modal coordinate and basic kinematics results such as a position and its time derivatives can be the more optimal way for that. The new version exports these necessary data into binary format in order to recover nodal position, velocity, and acceleration on the modal flexible body for FE and EasyFlexbodies.

Convert High order element into Linear element
A function for eliminating mid nodes in the high order element to reduce its order to linear has been developed. High order element has been used to get a high accuracy solution. In the case of the modal flexible body which usesthe only eigenvalue(frequency) and mode shapes for the solving process, it doesn't need to maintain the high order element.If this option turned on, all mid nodes will be removed and the order transformed into linear. And the mode shape data only for thelinear element node will be read while generating a *.dfmf file.More small size *.dfmf file will be generated if the option used while keeps a highly accurate solution for the modal flexible body. But there is no way to go back to high order element model without importing again.

Static Correction Mode for Rotational D.O.F.
In general, the unit displacements for the six d.o.f. are tested to get the static correction mode by the force or joint connection. The resultant modes improve the solution accuracy of the modal flexible body.However, in some case that torque is not applied such as motor stator, it is needlessto calculate the correction modes for the rotational d.o.f. By unchecking the option of "Impose Rotational Unit Disp.", you can speed up the body eigenvalue analysis of motor stator bodyby removing the calculation of the unnecessarystatic correction modes associated with therotational degree of freedom.The option is available for ANSYS Motioneigenvalue analysis as well as ANSYS eigenvalue analysis for ANSYS Motioninterface.

Pyramid element
Lots of pyramid elementaregeneratedwhile automeshing in ANSYS. DAFUL had been imported it after separating into two tetra elements. New version supports a linear type of pyramid element and import ANSYS one without transformation. A higher orderelementwill betransformedto linearorderif higher order pyramid elementis imported.

This chapter will introduce improvements of existing entities

Motion

Contact Stiction usability
Contact stiction algorithm has been improved. The stiction had correctly worked when the sliding distance is small in the previous version.But the new version gives an accurate solution for the stiction problem after long sliding distance happened such as fastening &loosening a bolt too.
Restriction on Joint
The joint restriction function was only available when the joint has a motion. But no matter it has a motion or not, the function works correctly. Making a limitation of moving range can be easily set even in a joint.
Contact force from GET_OBJECT_FORCE
The contact force can be measured from theGET_OBJECT_FORCEfunctionwithin an user subroutine.Using a special keyword defined in the "defusub.h" located in the installation folder, each 6 directional force components can be obtained in every report time step.With this function, the contact force can be used for the performance index in the DOE as well as other optimization processors can easily get the contact force data by reading a *.out file.
Penalty Method of Hyperelastic Material for FE body.
The formulation for the Hyperelastic Material has been improved and availability also has been expanded to Solid15 and Solid 20 element. The improvement reduces a simulation time up to 40% while maintaining its accuracy within 1%.
Additiona loutputs for Flexible Body.
Contact pressure contour and curve areavailable for all types of the flexible body include EasyFlex one. Contour animation can be shown after choosing a "contact pressure" type. Resultant nodal forces of C-load and P-loadare displayed on the animation view and theirsummation forces can be drawn as a graph on the Description view.

Improved functions of drivetrain

User input Rduction Raton for Power Flow.
Powerflow function had been not worked for several cases such as a planetary gear system because calculation of reduction ratio was impossible.Now, manual input for the reduction ratio is available so that Assemble manager can set the output load as well as calculate transmission error.
Transmission Error ofPlanetary Gear
Transmission Error of Planetary gear has developed and several outputs that changed depend on a input-output combination reported at the same time.
Gear Tolerance
Tolerance tab has been added in the gear property dialog. More detail tooth design has been possible by changing the GPSC(Generating Profile Shift Coefficient).The GPSC is decided by usingone option among base tangent length, ball& pin diameters, tooth thickness tolerance, and backlash. approachor input the value directly. The parameter of GPSC has been widely used in the gear design application field,and lots of gear design software have usedthe same wayfor detail tooth design.

ANSYS Motion is a third-generation engineering solution based on an advanced multibody dynamics solver. It enables fast and accurate analysis of rigid and flexible bodies and gives accurate evaluation of physical events through the analysis of the mechanical system as a whole.

ANSYS Motion uses four tightly integrated solving schemes: rigid body, flexible body, modal and meshfree EasyFlex. This gives you unparalleled capabilities to analyze systems and mechanisms in any combination you want. Large assemblies with many millions of degrees of freedom can be studied with the effects of flexibility and contact included. Standard connections and joints then allow these systems to be connected and loaded.

In addition to the basic package, ANSYS Motion offers additional toolkits so users working in areas with specific multibody dynamic needs can work faster and more efficiently.

Story about ANSYS Motion on DEVELOP3D LIVE 2019

ANSYS Inc. Founded in 1970, ANSYS employs nearly 3,000 professionals, many of whom are expert M.S. and Ph.D.-level engineers in finite element analysis, computational fluid dynamics, electronics, semiconductors, embedded software and design optimization. Our exceptional staff is passionate about pushing the limits of world-class simulation technology so our customers can turn their design concepts into successful, innovative products faster and at lower cost. As a measure of our success in attaining these goals, ANSYS has been recognized as one of the world's most innovative companies by prestigious publications such as Bloomberg Businessweek and FORTUNE magazines.

Product: ANSYS Motion
Version: 2019 R3
Supported Architectures: x64
Website Home Page :
http://www.ansys.com

Language: multilanguage
System Requirements: PC *
Supported Operating Systems: *
Size: 1.1 Gb




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