Journal of Computational and Nonlinear Dynamics
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Dynamics of a Deployable Mesh Reflector of Satellite Antenna: Form-Finding and Modal Analysis
Journal of Computational and Nonlinear Dynamics - Tập 11 Số 4 - 2016
Mesh reflectors with large apertures have been used in many communication
satellites. The performance of antenna reflectors crucially depends on the
faceting error of the reflective surface, which is approximated by using meshes.
The force density method (FDM) has been widely used for the form-finding
analysis of mesh reflectors. However, after performing form-finding of some
meshes, the effective...
Practical Tuning Rule Development for Fractional Order Proportional and Integral Controllers
Journal of Computational and Nonlinear Dynamics - Tập 3 Số 2 - 2008
This paper presents a new practical tuning method for fractional order
proportional and integral (FO-PI) controller. The plant to be controlled is
mainly first order plus delay time (FOPDT). The tuning is optimum in the sense
that the load disturbance rejection is optimized yet with a constraint on the
maximum or peak sensitivity. We generalized Ms constrained integral (MIGO) based
controller tuni...
Direct and Adjoint Sensitivity Analysis of Ordinary Differential Equation Multibody Formulations
Journal of Computational and Nonlinear Dynamics - Tập 10 Số 1 - 2015
Sensitivity analysis of multibody systems is essential for several applications,
such as dynamics-based design optimization. Dynamic sensitivities, when needed,
are often calculated by means of finite differences. This procedure is
computationally expensive when the number of parameters is large, and numerical
errors can severely limit its accuracy. This paper explores several analytical
approache...
The Adjoint Method for Time-Optimal Control Problems
Journal of Computational and Nonlinear Dynamics - Tập 16 Số 2 - 2021
Abstract In this article, we discuss a special class of time-optimal control
problems for dynamic systems, where the final state of a system lies on a
hyper-surface. In time domain, this endpoint constraint may be given by a scalar
equation, which we call transversality condition. It is well known that such
problems can be transformed to a two-point boundary value problem, which is
usually hard to...
Integration of Large Deformation Finite Element and Multibody System Algorithms
Journal of Computational and Nonlinear Dynamics - Tập 2 Số 4 - Trang 351-359 - 2007
This paper presents an overview of research and development efforts that are
currently being devoted to integrate large deformation finite element
formulations with flexible multibody system algorithms. The goal is to develop
computer simulation capabilities for the analysis of physics and engineering
models with significant details. The successful development of such new and
integrated algorithms...
On the Projection of a Flexible Bodies Modal Coordinates Onto Another Finite Element Model With Local Modifications
Journal of Computational and Nonlinear Dynamics - Tập 14 Số 7 - 2019
The time integration of a complex multibody system is a time consuming part of
the entire evaluation process of a flexible component. A multibody simulation of
a flexible crankshaft, for instance, interacting with pistons, con rods, fly
wheel, hydrodynamic bearings and further takes several hours of central
processing unit (CPU) time and may dominate the entire simulation chain. Small,
local chang...
Dynamics of Multibody Systems With Spherical Clearance Joints
Journal of Computational and Nonlinear Dynamics - Tập 1 Số 3 - Trang 240-247 - 2006
This work deals with a methodology to assess the influence of the spherical
clearance joints in spatial multibody systems. The methodology is based on the
Cartesian coordinates, with the dynamics of the joint elements modeled as
impacting bodies and controlled by contact forces. The impacts and contacts are
described by a continuous contact force model that accounts for geometric and
mechanical ch...
Normal Force-Displacement Relationship of Spherical Joints With Clearances
Journal of Computational and Nonlinear Dynamics - Tập 1 Số 2 - Trang 160-167 - 2006
The spherical joint with clearances can be modeled as an axi-symmetric
quasi-static contact of a sphere in a cavity. The Hertz theory based on the
assumption of nonconformal contact is often used to represent the normal
force-displacement relationship for the spherical joint with clearances. This
assumption limits the application of the theory, especially in the case of
occurring large deformation...
Translational Joints With Clearance in Rigid Multibody Systems
Journal of Computational and Nonlinear Dynamics - Tập 3 Số 1 - 2008
A computational methodology for dynamic description of rigid multibody systems
with translational clearance joints is presented and discussed in this work.
Over the past years, extensive work has been done to study the dynamic effect of
the revolute joints with clearance in multibody systems, in contrast with the
little work devoted to model translational joints with clearance. In a joint
with tra...
Development and Validation of Geometry-Based Compliant Contact Models
Journal of Computational and Nonlinear Dynamics - Tập 6 Số 1 - 2011
Simulations are often used to evaluate space manipulator tasks that involve
contact with the environment, due to the difficulty of performing realistic
earth-based experiments. An important aspect of these simulations is the contact
model used to determine the interbody forces between two objects in contact. In
this paper, we present two compliant contact models for polyhedral contacting
objects. ...
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