Study on Interference between Wires and Mobile Platform in a Wire-Driven Parallel Manipulator Based on ADAMS

2013 ◽  
Vol 694-697 ◽  
pp. 1671-1674
Author(s):  
Sui Lu Yue ◽  
Qi Lin ◽  
Yi Xin Chen ◽  
Zhao Wang
Keyword(s):  
Simulation Model ◽  
Parallel Manipulator ◽  
Virtual Prototyping ◽  
Mobile Platform ◽  
Time Varying ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Virtual Prototyping Technology ◽  
The Wire ◽  
Hinge Points

In this paper, to avoid interference between wires and a mobile platform in a wire-driven parallel suspension system, the simulation model of time-varying wires structure is established by applying the ADAMS virtual prototyping technology. The law of motion of hinge points is planned when the mobile platform performs a single degree of freedom pitch rotation. Using the simulation model of the time-varying wires structure, the interference is investigated. The results show that the simulation model is able to analyze the interference between wires and the mobile platform rapidly and provides an effective method for the design of the wire-driven parallel mechanism. Therefore, the interference can be avoided in the wire-driven parallel manipulator with time-varying wires structure, and the workspace of the mobile platform can be enlarged.

Study on Time-Varying Wires Structure in Wire-Driven Parallel Manipulators

2011 ◽  
Vol 148-149 ◽  
pp. 987-991 ◽  
Author(s):  
Sui Lu Yue ◽  
Qi Lin ◽  
Ru Bing Liu ◽  
Zhao Wang ◽  
Yi Xin Chen
Keyword(s):  
Parallel Manipulators ◽  
Calculation Model ◽  
Mobile Platform ◽  
Time Varying ◽  
Single Degree Of Freedom ◽  
Motion Equations ◽  
Single Degree ◽  
System A ◽  
Simulation Results ◽  
The Wire

In the paper, the concept of time-varying wires structure is proposed to avoid interference between wires and a mobile platform in a wire-driven parallel suspension system. A mathematical model, a kinematic notation model and a calculation model for interference between wires and the mobile platform have been built for it. When the mobile platform moves at a single degree of freedom pitch rotation, the motion equations of relevant hinge are deduced. The simulation results demonstrate that interference can be avoided in the wire-driven parallel manipulators with time-varying wires structure, and the workspace of the mobile platform may be enlarged. But different motions chosen for the hinge correspond to distinguishable sizes of workspace of the wire-driven parallel manipulators with time-varying wires structure. Therefore, according to the requirements to avoid interference, the motion of the hinge can be designed.

On the Stability Properties of a Periodically Forced, Time-Varying Mass System

2009 ◽  
Author(s):  
W. T. van Horssen ◽  
O. V. Pischanskyy ◽  
J. L. A. Dubbeldam
Keyword(s):  
Periodic Solutions ◽  
Forced Vibrations ◽  
Time Varying ◽  
Mass System ◽  
Single Degree Of Freedom ◽  
Stability Properties ◽  
Single Degree ◽  
Existence Of Periodic Solutions ◽  
The Stability ◽  
Varying Mass

In this paper the forced vibrations of a linear, single degree of freedom oscillator (sdofo) with a time-varying mass will be studied. The forced vibrations are due to small masses which are periodically hitting and leaving the oscillator with different velocities. Since these small masses stay for some time on the oscillator surface the effective mass of the oscillator will periodically vary in time. Not only solutions of the oscillator equation will be constructed, but also the stability properties, and the existence of periodic solutions will be discussed.

Dynamical Simulation Model of Auger Miner's Working Mechanism Based on Virtual Prototyping Technology

2011 ◽  
Vol 338 ◽  
pp. 199-204 ◽  
Author(s):  
Lin Fu ◽  
Chang Long Du ◽  
Kui Dong Gao
Keyword(s):  
Simulation Model ◽  
Dynamic Characteristics ◽  
Structural Design ◽  
Virtual Prototyping ◽  
Three Dimensional ◽  
Working Mechanism ◽  
Performance Improvements ◽  
Dynamical Simulation ◽  
Virtual Prototyping Technology ◽  
And Performance

In order to do research on dynamic characteristics of auger miner’s working mechanism, three-dimensional entity model was built by software Pro/E, some components of working mechanism were made flexible and corresponding Modal Neutral Files were created by software ANSYS. Through the date exchange among Pro/E, ANSYS and ADAMS, dynamical simulation model of working mechanism was built in ADAMS environment. ADAMS/vibration, a plugin in ADAMS, can solve the dynamical simulation model and obtain dynamic characteristics of working mechanism. The establishment of the model can lay the foundation for the research on dynamic characteristics of working mechanism. The resolved results of the model can provide reference for structural design and performance improvements of working mechanism.

Optimization and Analysis of Double Wishbone Independent Front Suspension Based on Virtual Prototype

2014 ◽  
Vol 490-491 ◽  
pp. 832-835 ◽  
Author(s):  
Zhao Zhuang Guo ◽  
Yue Fang Sun
Keyword(s):  
Simulation Model ◽  
Virtual Prototype ◽  
Simulation Software ◽  
Degree Of Freedom ◽  
Dynamics Simulation ◽  
Single Degree Of Freedom ◽  
Front Suspension ◽  
Single Degree ◽  
Tire Wear

The simulation model of the double wishbone independent front suspension with a single degree of freedom is built based on the dynamics simulation software ADAMS/VIEW in this paper. Through the optimization and analysis of the upper cross arm (UCA) and the low cross arm (LCA), we can achieve the goal of decreasing the sideways displacement and the tire wear.

Dynamic analysis of a ball screw feed system with time-varying and piecewise-nonlinear stiffness

2019 ◽  
Vol 233 (18) ◽  
pp. 6503-6518 ◽  
Author(s):  
Jianguo Gu ◽  
Yimin Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Ball Screw ◽  
Time Varying ◽  
Feed System ◽  
Restoring Force ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Nonlinear Restoring Force ◽  
Abrupt Changes ◽  
Screw Feed

In this study, a single-degree-of-freedom model is established to investigate the dynamic characteristics of a single-nut double-cycle ball screw feed system by considering the contact states of the nonlinear kinematic joints. Based on fully considering the parameters of the ball screw feed system, the axial deformations and forces of the key components are calculated to construct a set of piecewise-nonlinear restoring force functions of the system displacement and worktable position. The variations of the contact stiffnesses of the kinematic joints and transmission stiffness of the system with different boundary conditions are analyzed and the results indicate that they all have abrupt changes when the system displacement reaches a critical value. The changing law of the system transmission stiffness in the whole stoke is discussed. Additionally, the effects of excitation force, worktable position and system mass on the dynamic characteristics of the system and its correlative components are analyzed.

scholarly journals Reduced-Order Modeling and Experimental Studies of Bilaterally Coupled Fluid–Structure Interaction in Single-Degree-of-Freedom Flapping Wings

2020 ◽  
Vol 142 (2) ◽  
Author(s):  
Ryan K. Schwab ◽  
Heidi E. Reid ◽  
Mark Jankauski
Keyword(s):  
Flapping Wing ◽  
Flapping Wings ◽  
Inertial Forces ◽  
Time Varying ◽  
Single Degree Of Freedom ◽  
Fluid Structure ◽  
Reduced Order ◽  
Structure Interaction ◽  
Aerodynamic Damping ◽  
Single Degree

Abstract Flapping wings deform under both aerodynamic and inertial forces. However, many flapping wing fluid–structure interaction (FSI) models require significant computational resources which limit their effectiveness for high-dimensional parametric studies. Here, we present a simple bilaterally coupled FSI model for a wing subject to single-degree-of-freedom (SDOF) flapping. The model is reduced-order and can be solved several orders of magnitude faster than direct computational methods. To verify the model experimentally, we construct a SDOF rotation stage and measure basal strain of a flapping wing in-air and in-vacuum. Overall, the derived model estimates wing strain with good accuracy. In-vacuum, the wing has a large 3ω response when flapping at approximately one-third of its natural frequency due to a superharmonic resonance, where the superharmonic occurs due to the interaction of inertial forces and time-varying centrifugal softening. In-air, this 3ω response is attenuated significantly as a result of aerodynamic damping, whereas the primary ω response is increased due to aerodynamic loading. These results highlight the importance of (1) bilateral coupling between the fluid and structure, since unilaterally coupled approaches do not adequately describe deformation-induced aerodynamic damping and (2) time-varying stiffness, which generates superharmonics of the flapping frequency in the wing’s dynamic response. The simple SDOF model and experimental study presented in this work demonstrate the potential for a reduced-order FSI model that considers both bilateral fluid–structure coupling and realistic multi-degrees-of-freedom flapping kinematics moving forward.

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