Smart (active) materials based actuators, hereinafter called micro-actuators, have been shown to be well suited for the elimination of high harmonics in joint and/or end-effector motions of robot manipulators and in the reduction of actuator dynamic response requirements. Low harmonic joint and end-effector motions, as well as low actuator dynamic response requirements, are essential for a robot manipulator to achieve high operating speed and precision with minimal vibration and control problems. Micro-actuators may be positioned at the end-effector to obtain a micro- and macro-robot manipulation configuration. Alternatively, micro-actuators may be integrated into the structure of the links to vary their kinematics parameters, such as their lengths during the motion. In this paper, the kinematics and dynamics consequences of each of the aforementioned alternative are studied for manipulators with serial and closed-loop chains. It is shown that for robot manipulators constructed with closed-loop chains, the high harmonic components of all joint motions can be eliminated only when micro-actuators are integrated into the structure of the closed-loop chain links. The latter configuration is also shown to have dynamics advantage over micro- and macro-manipulator configuration by reducing the potential vibration and control problems at high operating speeds. The conclusions reached in this study also apply to closed-loop chains of parallel and cooperating robot manipulators.

1.
Rastegar
,
J.
, and
Fardanesh
,
B.
, 1990, “
Trajectory Pattern Specific Inverse Dynamics Formulation of Robot Manipulators and Its Applications
,”
ASME Mechanisms Conference
, Chicago, IL.
2.
Rastegar
,
J.
, and
Tu
,
Q.
, 1997, “
The Effects of the Manipulator Type on the Vibrational Excitation During Motion
,”
Mech. Mach. Theory
0094-114X
32
(
2
), pp.
221
234
.
3.
Rastegar
,
J.
,
Liu
,
L.
, and
Yin
,
D.
, 1999, “
Task-Specific Optimal Simultaneous Kinematic, Dynamic and Control Design of High-Performance Robotic Systems
,”
IEEE/ASME Trans. Mechatron.
1083-4435
4
(
4
), pp.
387
395
.
4.
Rastegar
,
J.
,
Yuan
,
L.
, and
Zhang
,
J.
, 2005, “
Smart Actuator Positioning and Displacement Transmissibility in Serial and Parallel Robot Manipulators for Performance Enhancement
,”
ASME J. Mech. Des.
1050-0472
127
(
4
), pp.
589
595
.
5.
Rastegar
,
J.
, and
Yuan
,
L.
, 2002, “
A Systematic Method for Kinematics Synthesis of High-Speed Mechanisms With Optimally Integrated Smart Materials
,”
ASME J. Mech. Des.
1050-0472
124
(
1
), pp.
14
20
.
6.
Rastegar
,
J.
, and
Yuan
,
L.
, 2001, “
A Systematic Method for the Design of Piezostack Actuator Integrated Robots for High-Speed and Precision Operation
,”
J. Intell. Mater. Syst. Struct.
1045-389X
12
(
12
), pp.
835
846
.
7.
Crawley
,
E.
, and
de Luis
,
J.
, 1987, “
Use of Piezoceramic Actuators as Elements of Intelligent Structures
,”
AIAA J.
0001-1452
25
(
10
), pp.
1373
1385
.
8.
Dohner
,
J. L.
,
Kwan
,
C. M.
, and
Regelbrugge
,
M. E.
, 1996, “
Active Chatter Suppression in an Octahedral Hexapod Milling Machine: A Design Study
,”
Proceedings of Smart Structures and Materials Conference
, San Diego, CA, SPIE 2721-41.
9.
Tzou
,
H. S.
,
Wan
,
G. C.
, and
Tseng
,
C. I.
, 1989, “
Dynamics and Distributed Vibration Controls of Flexible Manipulators: Integrated Distributed Sensing and Active Piezoelectric Actuator
,”
Proceedings of IEEE Intern. Conference on Robotics and Automation
, pp.
1716
1721
.
10.
Liao
,
C. Y.
, and
Sung
,
C. K.
, 1991, “
Vibration Suppression of Flexible Linkage Mechanisms Using Piezoelectric Sensors and Actuators
,”
J. Intell. Mater. Syst. Struct.
1045-389X
2
, pp.
177
197
.
11.
Chopra
,
I.
, 1995, “
Review of Current Status of Smart Structures and Integrated Systems
,”
Proceedings of Smart Structures and Materials Conference
, San Diego, CA, SPIE 2721-01.
12.
Culshaw
,
B.
, 1996, “
Smart Structures Activities Worldwide
,”
Proceedings of Smart Structures and Materials Conference
, San Diego, CA, SPIE 2721-100.
13.
Fardanesh
,
B.
, and
Rastegar
,
J.
, 1992, “
A New Model Based Tracking Controller for Robot Manipulators Using The Trajectory Pattern Inverse Dynamics
,”
IEEE Trans. Rob. Autom.
1042-296X
8
(
2
), pp.
279
285
.
14.
Tu
,
Q.
, and
Rastegar
,
J.
, 1999, “
On the Inherent Characteristics of the Dynamics of Robot Manipulators
,”
Mech. Mach. Theory
0094-114X
34
, pp.
171
191
.
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