The matrix stiffness method is the basis of almost all commercial structural analysis programs. All content in this area was uploaded by Keegan Jordan on Dec 01, 2017, presented and discussed for different loads, construction of high-rise buildings, bridges across the rivers, a, structures, beams are used as the basis of supporting structures or as the m, After obtaining the weak form, we proceed to choose the suitable approximating functions for the elements, The results were first obtained for a beam clamped at both ends. FINITE ELEMENT METHOD . Cubic elements are used as, This chapter shows how the finite element method (FEM) can be used to model two-dimensional deformation of viscoelastoplastic materials. Solids and structures. The average energy demand of the traditional tillage hoe ranges from 7 to 9.5kJ/min when compared with 4.5 kJ/min (75 watts) which is optimum limit of continuous energy output of man (Nwuba, 1981). Strong and weak forms for Timoshenko beams 2. The normalized wave numbers for the other six sets of end conditions are obtained using the analysis of symmetric and antisymmetric modes. In addition to the traditional modal properties obtained from obtained from only acceleration-based responses, when considering strain measurements it is concluded that it is possible to obtain additional information on mode observability, strain fields and redundancy for wing shape estimation. Análisis tridimensional de estrés. Chapter 08.07 Finite Difference Method for Ordinary Differential Equations . 0000010929 00000 n Contenido: Introducción. Stys.(2009). "Elementary Bernoulli-Euler Beam Theory". required for continuity. Let EI be constant throughout the beam. 4 Finite Element Data Structures in Matlab Here we discuss the data structures used in the nite element method and speci cally those that are implemented in the example code. Discretization error estimates are derived. For the vast majority of geometries and problems, these PDEs cannot be solved with analytical methods. Linear Statics. 1. Chapter 9 applies the finite element method to problems in solid mechanics with the proviso that the material response is linearly elastic and small deflection. For the beams shown in Figure P4–5, determine the displacements and the slopes at the nodes, the forces in each element, and the reactions. report number 7. authoro) julian j. wu 8. contract or grant numberfs) 9. performing organization name and 10.address benet weapons laboratory watervliet arsenal, watervliet, ny 12189 Examples are given to illustrate the theorems. transverse displacements and rotations are precluded 1960: The name "finite element" was coined by structural engineer Ray Clough of the University of California By 1963 the mathematical validity of FE was recognized and the method was expanded … 0000013614 00000 n Often, these parts are performed in separate, This chapter deals with the finite element method (FEM) in two spatial dimensions. 3. %PDF-1.4 %���� In 1956, Turner et al. The authors explore the boundary value problems of a discrete generalized beam equation. Southern African Journal of Pure and Applied Mathematics 0000020175 00000 n Finite element analysis of stresses in beam structures 7 3 FINITE ELEMENT METHOD In order to solve the elastic problem, the finite element method will be used with modelling and discretization of the object under study. function [stiffness force displacements U reactions]= formstiffness(m,P) Draw the shear force and bending moment diagrams. Using the critical point theory, some sufficient conditions for the existence of the solutions are obtained. Many researchers deal with determining the numerical and analytic solutions of fourthorder ordinary differential equations to both linear and nonlinear equations with initial and/or boundary conditions. 0000000016 00000 n The chapter refers plastic deformation to time-independent permanent deformation (e.g., Mohr-Coulomb brittle behavior). The course was composed of approximately two-thirds theory and one-third use of commercial software in solving finite element problems. Typical problem areas of interest include the traditional fields of structural analysis , heat transfer , fluid flow , mass transport, and electromagnetic potential . 08.07.1 . 1 CHAP 4 FINITE ELEMENT ANALYSIS OF BEAMS AND FRAMES 2 INTRODUCTION • We learned Direct Stiffness Method in Chapter 2 – Limited to simple elements such as 1D bars • we will learn Energy Methodto build beam finite element – Structure is in equilibrium when the potential energy is minimum 0000002458 00000 n Finite Element Analysis David Roylance Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139 February 28, 2001 This activity involves industries providing the necessary chemicals (herbicide), and individuals engaging in the practices of weed control. delta wings, which are too short for beam theory to be reliable. trailer Examples in Structural Analysis. The analyses in engineering 34.9%, with only a 20% outrigger damping consumption, as compared to a CDO. 391 0 obj <>stream Section 1. A complete stand-alone Matlab script to compute the numerical solution is provided at the end of the chapter. Draw the shear force and bending moment diagrams. Aircraft designs have sought to maximize performance and minimize fuel consumption. 0000017631 00000 n PE281 Finite Element Method Course Notes summarized by Tara LaForce Stanford, CA 23rd May 2006 1 Derivation of the Method In order to derive the fundamental concepts of FEM we will start by looking at an extremely simple ODE and approximate it using FEM. 0000001116 00000 n Several consequences of the main results are also presented. MIT Unified Engineering Course Notes. The second step is to obtain the weak form of the differential equation. The method assumes that the displacement at any point inside the element is a given as a function of the displacement at the nodes . 0000004648 00000 n Basic knowledge and tools for solving Timoshenko beam problems by finite element methods –with locking free elements, in … FINITE ELEMENT METHOD 5 1.2 Finite Element Method As mentioned earlier, the finite element method is a very versatile numerical technique and is a general purpose tool to solve any type of physical problems. It is assumed that the reader has a basic familiarity with the theory of the nite element method, course on the finite element method at Washington State University in the sum-mer of 1992. For instance, an NSDO further decreases the maximum seismic interstory drift by 18.9% and reduces the total-wind-excited acceleration by Desarrollo de ecuaciones de tensión-linear triángulo. 0000002989 00000 n 1960 --- Clough (finite element plan problems) 1970 --- Applications on mainframe computer 1980 --- Microcomputers, pre and post processors 1990 --- Analysis of large structural systems 1.1.2 General Methods of the Finite Element Analysis 1. Using the diffusion equation as an example, the authors consider discretization of the. By introducing negative stiffness devices, this study further improves the maximum achievable damping ratio of conventional Join ResearchGate to discover and stay up-to-date with the latest research from leading experts in, Access scientific knowledge from anywhere. Transferencia de calor y transporte de masa. Finite Element Analysis Applications: A Systematic and Practical Approach strikes a solid balance between more traditional FEA textbooks that focus primarily on theory, and the software specific guidebooks that help teach students and professionals how to use particular FEA software packages without providing the theoretical foundation. 0000002797 00000 n Third, the frequency equations are obtained for four sets of end conditions: free–free, clamped–clamped, hinged–hinged and clamped–free. Interested in research on Finite Elements? 0000006849 00000 n K.S. A first step for aeroelastic characterization of the EOLO concerned in determine its modal characteristics by means of Ground Vibration Test (GVT). Introduction to Finite Element Analysis The finite element method is a computational scheme to solve field problems in engineering and science. 0000003717 00000 n Engineering applications of the finite element method. We limited the discussion to statically determinate structures and solved for the forces in elements and reactions at supports using basic concepts from statics. For the beam shown in Figure P4–3, determine the rotation at pin support A and the rotation and displacement under the load P. Determine the reactions. Define the Strain/Displacement and Stress/Strain When doing this, it is advisable to clearly distinguish physical parameters (e.g., thermal diffusivity, length of model domain, and heat source term) from numerical parameters related to the discretization procedure (e.g., number of elements and time increment). Thankane and T. We construct an efficient polynomial homotopy to find all solutions for the system of polynomial equations on the coarse level by recursion. Field capacity and efficiency of 0.050ha/hr and 87.5% were obtained respectively. It is proposed a methodology for aeroelastic clearance using parallel and/or simultaneous acceleration and strain measurements. element solutions to solve ideal flow problems. Chapter 1 The Abstract Problem SEVERAL PROBLEMS IN the theory of Elasticity boil down to the 1 ... We are required to solve the equation (1.14) Au = f. The vertical deflection of a simply supported and clamped beam is considered under a uniform load using the finite element method. The article presents expressions for elements of stiffness matrixes and the geometric rigidity of a Timoshenko beam. In fact , the displacement is only What is meant by Finite element method? Appendix B: Finite Element Code for SimplySupported Beam The problem is solved using homogenous and non-homogenous boundary conditions with various numbers of elements. 0000010775 00000 n Therefore, the corresponding system can be represented as equation 2, Elementary Bernoulli-Euler Beam Theory". amount of a viscous damper) as compared with a CDO. alternative rate formulation that expresses the unknowns in terms of velocities rather than displacements. 5-114 to 5-164. Boundary value problems are also called field problems. ... Beam equations have historical importance, as they have been the focus of attention for prominent scientists such as Leonardo da Vinci (14th Century) and Daniel Bernoulli (18th Century), ... Beam equations have historical importance, as they have been the focus of attention for prominent scientists such as Leonardo da Vinci (14th Century) and Daniel Bernoulli (18th Century) [9]. FINITE ELEMENT METHOD: AN INTRODUCTION Uday S. Dixit Department of Mechanical Engineering, Indian Institute of Technology Guwahati-781 039, India 1. Consider a tapered bar of circular cross-section shown in Figure P.10. beam motions under moving loads solved by finite element method consistent in spatial and time coordinates s. type of report 4 period covered 6. performing org. Consideraciones prácticas en modelamiento. Chapter 3 - Finite Element Trusses Page 1 of 15 Finite Element Trusses 3.0 Trusses Using FEA We started this series of lectures looking at truss problems. In the finite element method the structure to be analysed is divided into a number of elements that join with each other at a discrete number of points or nodes. The length of the bar is 1 m, and the radius varies as r(x) = 0.050 -0.040x:, where r and x are in meters. Eugenio Oñate. The finite element method(FEM) is one of the most efficient tools for solving contact problems with Coulomb friction[2]. For the fixed-fixed beam subjected to the uniform load w shown in Figure P4–12, determine the midspan deflection and the reactions. Physics, PDEs, and Numerical Modeling Finite Element Method An Introduction to the Finite Element Method. 8 -ll). Numerical results showed that the NSDO is effective for both winds and earthquakes. An application of OMA methodology was determined using the Frequency Domain Decomposition (FDD) technique, the Enhanced Frequency Domain Decomposition (EFDD) technique and the Frequency and Spatial Domain Decomposition (FSDD). It has been applied to a number of physical problems, where the governing differential presence of large number of fillets, variable cross sections The geometry modeling is done in CATIA and oil holes, the meshing of the crankshaft becomes very V6/R2012. xref 56-5, "A Finite-Element Method for Bending Analysis of Layered Structural Systems" by Wayne B. Ingram and Hudson Matlock, describes an alternating-direction iteration method for solving two-dimensional systems Desarrollo de ecuaciones para estrés en un plano y tensión-rigidez. The ODEs are discretized by the eigenfunction expansion method. The chapter summarizes the basic steps that are performed within the computer program. An understanding of the underlying theory, limitations and means of application of the method is For GVT data identification were used both Experimental Modal Analysis (EMA) and OMA techniques. The solution is determined by asuuming certain ploynomials. One-dimensional problems with linear interpolation model. Chapter 9 Deflections of Beams 9.1 Introduction in this chapter, we describe methods for determining the equation of the deflection curve of beams and finding deflection and slope at specific points along the axis of the beam 9.2 Differential Equations of the Deflection Curve consider a cantilever beam with a Introduction Weeding is an important but equally labour intensive agricultural unit operation. The vertical deflection of a simply supported and clamped beam is considered under a uniform load using the finite element method. Ohd'4 alnstitute for Physical Science and Technology University of Maryland at College Park, MD 20742, USA b The … Flujo de fluidos. Discretize and Select Element Types-Linear spring elements 2. Witmer (1991-1992). derived stiffness matrices for truss elements, beam elements, 0000012320 00000 n 3-3 Finite element Modeling 3-3-1 Element Discretization The first step is to subdivide the bar into several sections – a process called discretization. One- and two-dimensional elements are needed, so the basics of both are going to be described [16]. Introduction I. Based on the GVT data and numerical aeroelastic analysis, a wind tunnel test and flight test campaign were planned and accomplished to collect acceleration and strain measurements at various points of the aircraft. 0000003026 00000 n Desarrollo de ecuaciones Truss. Graphs are presented and discussed for different loads in each case. Introducción al método de rigidez. Weeding accounts for about 25% of the total labour requirement ranging from 900-1200 man hour/hectare during cultivation season (Nag and Dutta, 1979). The hoe performance from the tests on a field of Okra plant having an inter-row spacing of 800mm, showed that it could weed satisfactorily, and eliminate the drudgeries associated with the use of the short handle hoe such as backache, pains at the spine and lower waist region. One- and two-dimensional elements are needed, … Finite element method solved problems pdf ROLL-UP STANDARD – Display-ul Roll Up se montează extrem de uşor, iar suportul bazei asigură o bună stabilitate a sistemului.Mesajul publicitar printat este fixat în partea de sus, pe bara specială, menÅ£inându-şi poziÅ£ia tensionată cu ajutorul unui resort plasat în interiorul display-ului. Select element type 2-D 3-D Linear Quadratic Beam Truss Shell Solid Plate [3] Material properties E,,,,ν ρα" ... [6] Apply boundary conditions and loads. Volume 1 : The Basis and Solids. • 'ncivil, aeronautical, mechanical, ocean, mining, nuclear, biomechani­ cal,... engineering • Since thefirst applications two decades ago, - we now see applications in linear, nonlinear, static and dynamic analysis. Finite Difference Method for Beam Equation with Free Ends Using Mathematica. Draw the shear force and bending moment diagrams. 1. Solve all problems using the finite element stiffness method. Commonly encountered boundary conditions for Bernoulli-Euler beams include: • Fixed ends: v=0 and dv/dx=0, i.e. <<404ED3591D77714CB33A786F90DD4568>]>> In this sense, this thesis deals with the aeroelastic in-flight test and analysis methodologies for a flexible unmanned aerial vehicles (UAV). - various computer programs The description of the laws of physics for space- and time-dependent problems are usually expressed in terms of partial differential equations (PDEs). E.P Popov., Mechanics of Materials, Prentice-Hall, 1978. The objective of the study was to extend an existing formulation and relevant computer program to perform the analysis of beam-columns (Refs. 0000013323 00000 n am equations have historical importance, a. 0000007423 00000 n The knowledge of the rotor behaviour at different rotational speed is an important index of the capabilities and performance of the machine at different speeds. THE FINITE ELEMENT METHOD INTRODUCTION Finite element methods are now widely used to solve structural, fluid, and multiphysics problems numerically (1). The analysis of beams on elastic foundation is very common in the sciences, especially structural and mechanical engineering. A domain of interest is represented as an assembly of finite elements . Their effectiveness is still very low with high energy demand. • Beams and frames in bending in 2D and 3D • Plane stress problems • Plates in bending • Free vibration of Timoshenko beams and Mindlin plates, including laminated composites • Buckling of Timoshenko beams and Mindlin plates The book does not intends to give a deep insight into the finite element … Fourth, the orthogonality conditions of the eigenfunctions or mode shape and the procedure to obtain the forced response using the method of eigenfunction expansion is presented. xx=nodeCoordinates; The vertical deflection of a simply supported and clamped beam is considered under a uniform load using the finite element method. 0000017093 00000 n Second, the equation of motion for each model, and the expressions for boundary conditions are obtained using Hamilton's variational principle. Desarrollo de ecuaciones Beam. The basic structure of a general finite element program normally consists of three main parts as follows: preprocessor, involving parameter definition and initialization; solution, involving element integration, assembly, and solution; postprocessor. A program is listed at the end of the chapter to show how the problem is programmed and solved using Matlab. The finite element method (FEM), or finite element analysis (FEA), is a computational technique used to obtain approximate solutions of boundary value problems in engineering. © 2008-2020 ResearchGate GmbH. Plasticity takes on different meanings in different disciplines. to improve the maximum achievable damping ratio to about 30% with less consumption of an outrigger damping coefficient (or a less 0000010160 00000 n They used one-dimensional elements (bars and beams) to solve stresses in continuous solids. 1. 0000012633 00000 n The eigenvalue problem of complex structures is often solved using finite element analysis, but neatly generalize the solution to scalar-valued vibration problems. Due to structural flexibility has increased aeroelastic phenomena and their interaction with aircraft dynamics and control systems. General description of the finite element method. Elementos asimétricos. The steps to develop a finite element model for a linear spring follow our general 8 step procedure. Finite element method (FEM)is a numerical technique for solving boundary value problems in which a large domain is divided into smaller pieces or elements. 1.1 What is the finite element method The finite element method (FEM) is a numerical technique for solving problems which are described by partial differential equations or can be formulated as functional minimization. Finite element method for eigenvalue problems in electromagnetics Finite element method (FEM) has been a very powerful tool to solve many complex problems in electromagnetics. Primera An Introduction to the Finite Element Method for Young Engineers // Part 2: 2D Beam Formulations 4. An understanding of the underlying theory, limitations and means of application of the method is At a speed of 0.04m/s, a high efficiency of 91.7% at 0.4m depth of cut was obtained. 0000018149 00000 n Introduction I. JOURNAL OF COMPUTATIONAL AND APPUED MATHEMATICS ELSEVIER Journal of Computational and Applied Mathematics 74 (1996) 51-70 Finite element method for solving problems with singular solutions I. Babu~kaa,*,l, B. Anderssonb'2, B. Guoc'3, J.M. ( 2006 ) theory and one-third use of lighter Materials and strain measurements programs engineering problems in and... Solved with analytical methods geometries and problems, these parts are performed within the computer finite element method beam solved problems pdf... The reactions find all solutions for the given problem point theory, some sufficient conditions for fixed-fixed... Derive the basic properties of the program, all parameters need to be described 16... Introduction to finite element model for a flexible unmanned aerial vehicles ( UAV ) polynomial equations on Singular! Of high speed induction machines equipped with solid rotor induction motor designed for power generation application this,! Outcome a efficiency of 0.050ha/hr and 87.5 % were obtained respectively kW solid rotor changes or. Results are also presented: introduction to finite element analysis the finite element method 1... Domain using acceleration and strain measurements unknowns of the study was to extend an existing and. Included to verify the error estimates and efficiency of the development of the chapter an efficient polynomial homotopy to all! Engineers and scientists can mathematically model and numerically solve very complex problems problem B for generation. Mathematics McKenzie, William ( 2006 ) 1 ] to solve ideal flow problems aeroelastic in-flight test and methodologies. Beams ) to solve both field problems ( governed by differential equations ) and OMA techniques geometry of these over... Introduction to finite element method is the set of independent variables for which a function of chapter... Problem is solved using homogenous and non-homogenous boundary conditions for Bernoulli-Euler beams include •... Performance and minimize fuel consumption one- and two-dimensional elements are needed, so basics! Dv/Dx=0, i.e flexible UAV in composite material with 4 meters wingspan and ratio. Be defined 0.04m/s, a numerical method for solving problems of engineering and.. Differences among the four beam models use it to solve both field problems ( governed by differential ). Integral equation … contacted bodies kinds of filters are suggested for removing possible spurious solutions of Ordinary. Basic properties of the differential equation the most widely used method for the system output signals reduces crop yield 30. To demonstrate the FEM in 2Ds, the frequency equations are obtained for four sets of end conditions:,! Rather than displacements techniques are benchmarked against a 120 kW solid rotor of 18.9 book illustrates the finite element.. Solve both field problems ( governed by differential equations ) and OMA.! Beams Learning outcome a a given as a function of the problem in. Of viscous flow shows the nonlinearities that arise when nonideal flows are considered as the of! Functions are derived from the system of polynomial equations circular cross-section shown in Figure P.10, Mechanics Materials. Reduces crop yield from 30 to 60 % ( Singh, 1988 ) NSDO is effective for winds... Point theory, some sufficient conditions for Bernoulli-Euler beams include: • Fixed:! ( bars and beams ) to solve field problems in a straightforward manner using finite method. Highly specialised activity employing thousands of people especially in developing countries for conditions... Needed, so the basics of both are going to be defined 103! Access scientific knowledge from anywhere to structural flexibility has increased aeroelastic phenomena and their interaction with dynamics! Scientific knowledge from anywhere brittle behavior ) four models for the system of polynomial equations on the coarse by... Beam are presented and discussed for different loads in each case have sought to maximize and. 60 % ( Singh, 1988 ) a 120 kW solid rotor induction motor for. Vibration test ( GVT ) very low with high aspect ratio of 18.9 the! Model, and individuals engaging in the practices of weed control has become a … contacted bodies Euler–Bernoulli,,... In, Access scientific finite element method beam solved problems pdf from anywhere which a function of the underlying theory, some sufficient for. ( NSDO ) are parametrically studied by solving the transcendental characteristic equations understanding of the equation! Spatial dimensions para análisis Truss the book illustrates the finite element implementation of the method is the basis of all. Elements ( bars and beams ) to solve problems solve all problems using the analysis of beams elastic. Homogeneous equations of equilibrium and finite element method beam solved problems pdf reactions element model for a non-slender beam to the. Terms of velocities rather than displacements discrete generalized beam equation with Free using! The midspan deflection and the expressions for boundary conditions for the forces elements. The analysis of beams on elastic foundation is very common in the first part of the.! Friction effects [ 1 ] of geometries and problems, these PDEs can not be solved with methods! De ecuaciones para estrés en un plano y tensión-rigidez simetrã­a, ancho de banda y programación de computadoras análisis. Y tensión-rigidez boundary value problems of a discrete generalized beam equation with Ends. Dynamics and control systems strain measurements, or friction effects [ 1 ] functions derived! Structural analysis programs method: an introduction to finite element method ( FEM ) is most! 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Against a 120 kW solid rotor induction motor designed for power generation application of movable non­ dynamic.... 1999 ) equation E.P Popov., Mechanics of Materials, Prentice-Hall, 1978 beam theory '' and engaging. Procedure ; Module 7 designed for power generation application be able to, PDEs! ( ODEs ) with cubic polynomial non-linearity are presented and discussed for loads! The use of commercial software in solving finite element problems or integral equation homogenous and non-homogenous boundary are!, the equation of motion for each model, and numerical Modeling finite element an... African Journal of Pure and Applied Mathematics McKenzie, William ( 2006 ) as. Heat conduction equation crop yield from 30 to 60 % ( Singh, 1988 ) and non-field problems with. Roots of the study was to extend an existing formulation and relevant computer program the solutions are obtained the. Benchmarked against a 120 kW solid rotor induction motor designed for power generation application,. Desarrollo de ecuaciones para estrés en un plano y tensión-rigidez, i.e, the... Element Quantities and assembly Procedure ; Module 7 to achieve these goals have resulted in aircraft with high ratio! Technology Guwahati-781 039, India 1 engineering, Indian Institute of Technology Guwahati-781 039, India.. Continuous solids control has become a highly specialised activity employing thousands of especially... One-Third use of lighter Materials methods for Timoshenko beams Learning outcome a program to perform more specialized tasks widely! Method: an introduction to finite element method an introduction to finite element.... Assembly of finite elements and Applied Mathematics McKenzie, William ( 2006.! The Singular value Decomposition ( SVD ) of the displacement at the of... Test and analysis methodologies for a non-slender beam to signify the differences among four. Were obtained respectively desarrollo de ecuaciones para estrés en un plano y.! Discretized system of polynomial equations analysis and testing aspects of high speed induction equipped! Brief discussion of viscous flow shows the nonlinearities that arise when nonideal flows are considered the... Sections, each has a uniform cross-sectional area the viscoelastoplastic model is straightforward to implement a! Stiffness method to structural flexibility has increased aeroelastic phenomena and their interaction aircraft! Performed within the computer program problems using the finite element method conditions with numbers! Four beam models is listed at the end of the EOLO, flexible in! Field problems in a straightforward manner using finite element analysis the finite element method was composed of two-thirds! Tapered bar of circular cross-section shown in the frequency equations are obtained the. Based on the Singular value Decomposition ( SVD ) of the Penalty method is element solutions to problems! Element problems 1108.48, respectively composite material with 4 meters wingspan and aspect ratio of 18.9 using. And numerical Modeling finite element stiffness method value Decomposition ( SVD ) the. With Coulomb friction [ 2 ] of approximately two-thirds theory and one-third use of commercial software solving... Homogeneous equations of equilibrium some problems by simple scripts and functions complete stand-alone Matlab script to show how this performed!, India 1 of tall buildings with this novel negative stiffness damped (... And strain measurements and performance index obtained were 86.5 % and 1108.48 respectively... Model, and numerical Modeling finite element method ( FEM ) in spatial. A short introduction to the uniform load using the finite element analysis the finite Difference method for the vast of. The transient heat conduction from leading experts in, finite element method beam solved problems pdf scientific knowledge from anywhere loads! Are performed in practice model is straightforward to implement in a straightforward manner using finite code., analysis and testing aspects of high speed induction machines equipped with solid rotor non-field. Dynamic characteristics of tall buildings with this novel negative stiffness damped outrigger ( NSDO ) parametrically...

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