If your mechanism can be represented in cross section and movement is just in 2 dimensions i always sketch it fi. Linear static analysis of a fitting nastran incad 2018. Kinematic coupling hello all, i am currently modeling a steel beamtocolumn connection in cae. A kinematic coupling constraint is advantageous when a particular kinematic mode in a structure must be suppressed. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. If inertia mass is eliminated, and all bodies are rigid links with kinematic constraints, then the multibody analysis reduces down to a kinematic mechanism analysis. Discuss topics of finite element analysis on the aircraft industry environment. Both types of coupling constraint have the common purpose of coupling the motion of a collection of nodes on a surface the coupling nodes to the motion of a reference node. There is no need to modify the adams model there is no need to change your processes export job can be triggered at any operating point export job is a high fidelity translation accurate kinematics matching eigenvalues static cases only 5262011 7. The constrained degrees of freedom at the coupling nodes can be specified in a local coordinate system instead of the default global coordinate system see orientations, section 2. When the level of repeatability required of a kinematic coupling is in.
The tool is called gim, from faculty of engineering in bilbao, department of mechanical engineering, university of the basque country upvehu the software is intended for educational purposes, in particular destined to the field of kinematic analysis, motion simulation and synthesis of planar mechanisms as well as for the static analysis. This chapter provides a fundamental description of kinematic coupling design, with special considerations given to interfaces used in equipment that is subject to large. In its simplest form, the above kinematic coupling function could be tx2 tx1, which means node 2 follows exactly the displacement of node 1. Ondemand webinar predict and reduce gear whine noise 5 times faster. Slocum a closed form analysis for the design of a threegroove kinematic coupling is developed and used to design a 356 mm 14 in diameter kinematic coupling with 28. Kinematic couplings are precisionmachined mechanical contacts used to precisely locate components with respect to each other. Msc nastran is a multidisciplinary structural analysis application used by engineers to perform static, dynamic, and thermal analysis across the linear and. The origin of the kinematic coupling dates back at least to 1,876 when james clerk maxwell described the threevee coupling as a method to establish a definite position.
This software and related documentation are proprietary to siemens product lifecycle. In this video we explain by means of an example how type0 juction can be used to incorporate kinematic coupling in models of mechanical systems. Multidisciplinary analysis makes it possible to integrate fea, controls, multibody dynamics, finite difference, closed form equations, and more, to enable cosimulation across the boundaries of engineering. The program is oriented to practical engineers, students and teachers, in other words it is oriented to all people who are involved in problems of dynamics of machines and mechanisms. Optimal design techniques for kinematic couplings sciencedirect. Msc nastran is the premiere finite element analysis solver that continues to be the selected choice by engineers for over 50 years. What are the design parameters for a kinematic coupling that must repeat to a few microradians and have an unheard of minimum life of 20,000 insertions and extractions. Design of a kinematic coupling for precision applications. Kinematic coupling constrained the nodes associated with the washerbearing surface to the translation and rotation of a node on the bolt. The kinematic coupling constraints are useful in cases where a large number of nodes the coupling nodes are constrained to the rigid body motion of a single node and the degrees of freedom that participate in the constraint are selected individually in a local coordinate system. From the hpc capability to the high degree of certainty it delivers, msc nastran is engineered to give you a heightened awareness of how your products will behave. You can say the nodes are rigidly connected to the control node.
Kinematic couplings exactly constrain six degrees of freedom between two parts and hence closedform equations can be written to describe the structural performance of the coupling. Schouten et al kinematic coupling for precision applications in the direction of the preload. This chapter provides a fundamental description of kinematic coupling design, with special considerations given to interfaces used in equipment that is subject to. This is a variation of the kelvin clamp, that uses v grooves because they are easier to machine. Select here for more information about g2h courses in the robcad advanced modeling and kinematics course students will be exposed to specific features of robcad advanced modeling license for sections that can be used to design more complex kinematic structures such as robots, guns, fixtures, etc. However, when mass is included, the analysis is inherently dynamic. An application is the simulation of pure bending in thinwalled pipes, in which the cross section must ovalize but remain plane. Learn more about simcenter 3d software acoustic modules from siemens digital industries software. Siemens plm software, a leader in media and telecommunications software, delivers digital solutions for cuttingedge technology supporting complex products in a rapidly changing market. Nastran is used to perform normal modes sol 103 and forcedresponse analyses sol 108, 111 on cylindrical and cubic fluidstructure models. The coupling preserves the distance between the two nodes. Enterfea is a team of passionate engineers for many years we deal with the most difficult engineering tasks, simply because we enjoy them most.
Kinematic coupling massachusetts institute of technology. Coupling constraints apply to all nodes of a surface given by the user. What is the best software for kinematic and kinetic. The two components snap together using magnets while the spheres of one part mate to the varying geometries of the second to. It includes a full suite of direct geometry modeling and editing tools as well as fe prepostprocessing tools that. Kinematic coupling geometry the accuracy of a kinematic coupling is a function of systematic errors e. Property boundary mpc rbeam part point dof where point must be a rigid body reference node element type rbref, part can be a femgen point, line, surface, body or set and dof is the constrained degrees of freedom. The developed model is very useful for modeling and.
Generate transmission gearbox models automatically and boost. This thesis encompasses all issues as well as their resolutions, encountered in the process of air bearing kinematic coupling abkc development. Ive recently discovered a very awesome software tool for the synthesis and analysis of mechanisms. There is no need to modify the adams model there is no need to change your processes export job can be triggered at any operating point export job is a high fidelity translation accurate kinematics matching eigenvalues static cases.
He also described the tetrahedronveeflat coupling in use by william thomson, now widely known as lord kelvin and hence the term kelvin clamp. Msc nastran s performance in the solution of fullycoupled fluidstructure problems is evaluated. Dynamic analysis is an important known strength of nx nastran. My vague impression is, kinematic coupling ties the displacement motion of node 2 to node 1, using a function such as tx2 functiontx1, where t means translation, and x means global x axis. Kinematic software solves geometric intersection equations which are fast and precise mechdesigner builds your assembly into very efficient kinematic forms geometric intersection equations. The msc software corporate logo, msc, and the names of the msc. Porous carbon air bearings are used as mating elements between the top and bottom parts of a coupling. Sol 402 multistep kinematic based on integration of samcef in nx nastran applicability sol 401 and sol 402 similarities use many of the same formulations and give nearly same results core set of capabilities that are the same and can be used for same applications use same nastran inputs and outputs. Thanks to our experience in design backed up with knowledge gained at our work at wroclaw university of science and technology we are able to cope. The constraint can be applied to userspecified degrees of freedom at the coupling nodes with respect to the global or a local coordinate system. What changes i can expect if i change rbe2 in place of rbe3 in. Kinematic constraints this chapter describes rigid constraints, multipoint constraints, gap elements, distributing coupling, kinematic coupling constraints and initial conditions, which are written in the abaqus input file under the following comment cards. At most companies, cae is performed as an isolated activity within a single functional team or engineering discipline.
Each hemisphere has two contact points for a total of six contact. Aug 01, 2019 rbe2 and rbe3 rigid elements are nastran specific. Property boundary mpc rbeam part point dof where point must be a rigid body reference node element type rbref, part can be a femgen point, line, surface, body or set. Kinematic coupling constraints princeton university. Or, you could make the kinematic coupling more advanced, such as tx2 0. What changes i can expect if i change rbe2 in place of. You will see unusual stresses due to this constraint so depending on your application you should apply this away from areas if interest. A kinematic coupling constrains a group of slave nodes to the translation and rotation of a master node in a customized manner. Universal mechanism the software for modeling of dynamics. In a kinematic coupling constraint by the user specified degrees of freedom in these nodes follow the rigid body motion about a reference point also given by the user. In the model, u1 and u2 displacements at the end of the rhs beam should be coupled to the top of the lower column segment see attached snapshot. They dont have their unique counterparts in abaqus. Kinematic coupling describes fixtures designed to exactly constrain the part in question, providing precision and certainty of location. The inextensional coupling provides a constraint similar to the nastran rrod rigid body element and the abaqus mpc link.
This tutorial uses a fitting model to illustrate a simple linear static analysis. Multiphysics fea can account for some of these interactions, but often the mathematical basis for disciplines are fundamentally. Simcenter includes the premier finite element method fem solver nx nastran software to offer engineers computational performance, accuracy. However usually kinematic coupling is chosen in place of rbe2 elements and. The performance, safety, and reliability of their products, however, is greatly influenced by the interactions between these disciplines. Analogy of ballgroove joint to a mechanism figure 1. Kinematic diagram of the laminated composite 3d beam element, right laminated composite beam subjected to torsion, bending moments and axial force. Kinematic coupling in abaqus in abaqus when we want to define a concentrated force cf at a certain point but it is coupled with other surfaces nodes. The washers were represented as sets of kinematic coupling constraints that extended from the bolt centerline to a specified distance on the outer flanges to simulate the bearing load. The kinematic coupling is a well known and widely used device for providing. There is a good deal of confusion as to what constitutes a true kinematic coupling. Instead user can replace them with 2 types of coupling constraints.
In calculix the rigid body equations elaborated in section 3. Oct 17, 2016 in this video we explain by means of an example how type0 juction can be used to incorporate kinematic coupling in models of mechanical systems. Connections between the bodies are modeled with kinematic joints or linearnonlinear springsbushingsdampers. A kinematic coupling restricts all six degrees of mechanical freedom without over constraining any one of them. Design of accurate and repeatable kinematic couplings.
It includes a full suite of direct geometry modeling and editing tools. From the hpc capability to the high degree of certainty it delivers, msc nastran is engineered to give you a heightened awareness of how. Nastran is born 1973 msc goes global 2009 stg acquires msc 2002 addition of multibody simulation 2010 multidiscipline innovation in msc nastran solver 1994 addition of prepost processing 1969 first msc. Nx nastran is a finite element solver for stress, vibration, structural failure, heat. Multidiscipline cae enables applications from nearly any mathematical regime to share data that enables system level modeling and analysis.
Table of contents vi advanced nonlinear solution theory and modeling guide 4. Pen, paper, scissors for 3d complex motions im not familiar with any tool besides the ones offered inside professional cad software. Kinematic coupling in abaqus in abaqus when we want to define a concentrated force cf at a certain point but it is coupled with other surfaces nodes so the force is transfered to those surfaces. Gim mechanism software kinematics analysis synthesis.
Abaqus2 kinematic coupling vs rigids physics forums. Simulating the structural response of a preloaded bolted joint. Since each slave node has a separate relationship with the master node, the kinematic coupling constraint can be considered. Each model is diseretized using finite element methods.
Kinematic vs continuumstructural distributing coupling. Which fea software is mostly used in the industry, and why. Although there are many variations we divided kinematic couplings into two classes. Kinematic coupling will force all slave nodes to strictly remain fixed with respective to each other and follow the control point movement. Actually 120,000 cycles were achieved, at which point testing was stopped. Some differences between the two methods are outlined below. Kinematic coupling constraints can be defined with the command. Nx nastran fe solver analysis modules solution sequences. Chapter 2 kinematic coupling design a fundamental technology of highprecision mechanical interfaces for modular machine and instrumentation structures is the kinematic coupling.
Dieses programm wird nasa structural analysis getauft, kurz nastran. Only the translational degrees of freedom of the nodes are involved in the constraint. Explicit tangent stiffness matrix for the geometrically. This means that the simulation, rather than animation, is precise and exact. Another way to achieve tx2 tx1 is to use a rigid bar finite element, such as rbar or rbe2. The tool is called gim, from faculty of engineering in bilbao, department of mechanical engineering, university of the basque country upvehu the software is intended for educational purposes, in particular destined to the field of kinematic analysis, motion. Nx advanced fem software is a comprehensive multicad finite element modeling and results visualization solution that is designed to meet the needs of experienced cae analysts. Learning the basic steps to create and analyze a simple part model. Kinematic coupling constrains the motion of the coupling nodes to the rigid body motion of the reference node. Fullycoupled fluidstructure vibration analysis using msc. A canonical example of a kinematic coupling consists of three radial vgrooves in one part that mate with three hemispheres in another part. Hertz contact theory can also be used to design the contact interface so very high stiffness and load capacity can also be achieved. Mscnastrans performance in the solution of fullycoupled fluidstructure problems is evaluated. Kinematic couplings for precision fixturing part i formulation of design parameters a.
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