Stiffness Design, Analysis and Validation of a Parallel-Mechanism Equivalent Suspension System

2015 ◽  
Author(s):  
Chen Qiu ◽  
Ketao Zhang ◽  
Jing Shan Zhao ◽  
Jian S. Dai
Keyword(s):  
Parallel Mechanism ◽  
Optimization Design ◽  
Screw Theory ◽  
Suspension System ◽  
Force Analysis ◽  
Design Constraint ◽  
Kinematic Design ◽  
Simulation Validation ◽  
Element Simulation ◽  
Stiffness Design

This paper provides a systematic approach to design a vehicle’s independent suspension system. In this approach, multi-link type suspension is selected. By treating it as a parallel mechanism, both the kinematic design and force analysis are conducted in the same framework of screw theory. Regarding the kinematic design, constraint-based approach is used to find suitable layouts of constraint limbs in accordance with desired degree of freedom. In the force analysis, stiffness matrix of the suspension mechanism is developed, leading to the deformation and stress analysis under various critical loads. The developed formulae are further utilized to design suitable suspension mechanism, followed by finite-element-simulation validation as well as optimization design to reduce the resulted maximum stresses.

Repelling-Screw Based Force Analysis of Origami Mechanisms

2016 ◽  
Vol 8 (3) ◽  
Author(s):  
Chen Qiu ◽  
Ketao Zhang ◽  
Jian S. Dai
Keyword(s):  
Parallel Mechanism ◽  
Screw Theory ◽  
Reaction Force ◽  
Theoretical Background ◽  
Force Analysis ◽  
Modeling Approach ◽  
Reaction Forces ◽  
Redundantly Actuated

This paper provides an approach to model the reaction force of origami mechanisms when they are deformed. In this approach, an origami structure is taken as an equivalent redundantly actuated mechanism, making it possible to apply the forward-force analysis to calculating the reaction force of the origami structure. Theoretical background is provided in the framework of screw theory, where the repelling screw is introduced to integrate the resistive torques of folded creases into the reaction-force of the whole origami mechanism. Two representative origami structures are then selected to implement the developed modeling approach, as the widely used waterbomb base and the waterbomb-based integrated parallel mechanism. With the proposed kinematic equivalent, their reaction forces are obtained and validated, presenting a ground for force analysis of origami-inspired mechanisms.

A force analysis of a 3-RPS parallel mechanism by using screw theory

Robotica ◽  
2011 ◽  
Vol 29 (7) ◽  
pp. 959-965 ◽  
Author(s):  
Y. Zhao ◽  
J. F. Liu ◽  
Z. Huang
Keyword(s):  
Parallel Mechanism ◽  
Screw Theory ◽  
Mechanical Design ◽  
Parallel Manipulators ◽  
Simultaneous Equations ◽  
Force Analysis ◽  
New Approach ◽  
Numerical Example ◽  
And Control

SUMMARYThe force analysis of parallel manipulators is one of the important issues for mechanical design and control, but it is quite difficult often because of the excessive unknowns. A new approach using screw theory for a 3-RPS parallel mechanism is proposed in this paper. It is able to markedly reduce the number of unknowns and even make the number of simultaneous equations to solve not more than six each time, which may be called force decoupling. With this method, first the main-pair reactions need to be solved for, and then, the active forces and constraint reactions of all other kinematic pairs can be simultaneously obtained by analyzing the equilibrium of each body one by one. Finally, a numerical example and a discussion are given.

Constraint-Based Design and Analysis of a Compliant Parallel Mechanism Using SMA-Spring Actuators

2014 ◽  
Author(s):  
C. Qiu ◽  
K. Zhang ◽  
Jian S. Dai
Keyword(s):  
Parallel Mechanism ◽  
Screw Theory ◽  
Parallel Mechanisms ◽  
Element Simulation ◽  
Compliant Parallel Mechanism ◽  
Physical Prototype ◽  
Simulation And Experiment ◽  
Parallel Platform ◽  
Sma Spring ◽  
Actuation Systems

This paper presents a novel compliant parallel mechanism that utilizes shape-memory-alloy (SMA) spring based actuators. By employing SMA coil springs, the traditional line constraint that resists translation along its axis but no other forms of motions is transformed into a linear actuator that can generate deflection along its axis, which leads to the design of SMA-spring linear actuators. In accordance with this SMA actuator, an constraint-based approach in the framework of screw theory is utilized to synthesize the constraint and actuation space of parallel mechanisms, and a novel 4 DOF parallel platform is developed based on this analytical approach. A physical prototype is manufactured by employing the SMA-spring actuators, and its mobility and workspace are verified with both finite element simulation and experiment observations. The results illustrate this parallel mechanism has a large workspace in all desired mobility configurations. The presented work on the parallel platform demonstrates the efficiency of the constraint-based approach in determining the layout of actuation systems, also the developed SMA actuators pave a new way for applying the SMA technique in the future development of compliant parallel mechanisms and robotics.

Force analysis of the redundantly actuated parallel mechanism 2RPR+P considering different control methodologies

2021 ◽  
pp. 103783
Author(s):  
Yundou Xu ◽  
Ze Jiang ◽  
Zhongjin Ju ◽  
Zengzhao Wang ◽  
Wenlan Liu ◽  
...  
Keyword(s):  
Parallel Mechanism ◽  
Force Analysis ◽  
Redundantly Actuated

Optimization Design of an Axial-Flow Fan Used in Local Ventilation in Mining Industry

2011 ◽  
Author(s):  
Dhaval Desai ◽  
Jiang Zhou
Keyword(s):  
Optimization Design ◽  
Optimization Technique ◽  
Mining Industry ◽  
Axial Flow ◽  
Optimization Method ◽  
Low Noise ◽  
Design Constraint ◽  
Engineering Research ◽  
Blade Element Theory ◽  
Local Ventilation

In a world where the increasing demand on developing energy-efficient systems is probably the most stringent design constraint, the trend in engineering research in recent years has been to optimize the existing technologies rather than to implement new ones. The present work addresses a robust axial-type fan design technique developed using an optimization technique. A fan is indispensable equipment for primary and local ventilation in mining industries. We always pursue the fan with high working efficiency and low noise. In this paper, an optimization method is developed to improve the pneumatic properties of the fan based on the blade element theory. A new type of fan used in local ventilation is designed with the help of computer. It is shown that the new design enhanced the efficient up to 88%. Numerical analysis is also conducted to validate the optimization design results.

Finite element simulation and optimization design of biodegradable seedling pot

2015 ◽  
pp. 223-226
Author(s):  
Xing-Dong Liu ◽  
Shu-Jun Li ◽  
Lu-Jia Han ◽  
Quan-Rong Jing ◽  
Dao-Yi Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Optimization Design ◽  
Simulation And Optimization ◽  
Element Simulation

scholarly journals Design and Kinematics Analysis of Suspension System for a Formula Society of Automotive Engineers (FSAE) Car

2021 ◽  
pp. 48-63
Author(s):  
K. Sriram ◽  
K. Anirudh ◽  
B. Jayanth ◽  
J. Anjaneyulu
Keyword(s):  
Vehicle Control ◽  
Simulation Software ◽  
Suspension System ◽  
Road Surface ◽  
Kinematics Analysis ◽  
Kinematic Simulation ◽  
Kinematic Design ◽  
The Road ◽  
Adams Simulation

The main objective of the Suspension of a vehicle is to maximize the contact between the vehicle tires and the road surface, provide steering stability and provide safe vehicle control in all conditions, evenly support the weight of the vehicle, transfer the loads to springs, and guaranteeing the comfort of the driver by absorbing and dampening shock. This paper discusses the kinematic design of a double a-arm Suspension system for an FSAE Vehicle. The hardpoint’s location can be determined using this procedure to simulate motion in any kinematic simulation software. Here, Optimum Kinematics is used as kinematic simulation software, and the results are verified using Msc Adams simulation. The method illustrated deals with the basics of Kinematics which helps to predict the characteristics of the Suspension even before simulating it in the kinematic simulation software.

Actuating Input Selection of 5-UPS/PRPU Parallel Machine Tool

2005 ◽  
Author(s):  
Jian-She Gao ◽  
Ren-Cheng Zheng ◽  
Yong-Sheng Zhao
Keyword(s):  
Parallel Mechanism ◽  
Basic Problem ◽  
Screw Theory ◽  
Parallel Machine ◽  
Condition Numbers ◽  
Constraint Matrix ◽  
Input Selection ◽  
Moving Platform ◽  
Parallel Machine Tool ◽  
Selection Of

The actuating input selection is an important basic problem for the parallel mechanism. Based on the screw theory, the constraint screw can be got after locking a kinematic pair in any limb, which can be taken as actuating wrench acted on the moving platform of the parallel mechanism. The constraint screw matrix is composed of the structure constraint screws and the constraint screws of the actuating pairs. The reasonableness of input selection can be judged by the rank of the constraint matrix. The performance of the combinations of actuating inputs is evaluated by the condition numbers of the force constraint matrix and the torque constraint matrix respectively. The theory presented is validated by the simulation and the maching test.

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