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Title: Theoretical Control-Centric Modeling for Precision Model-Based Sliding Mode Control of a Hydraulic Artificial Muscle Actuator

Journal Article · · Journal of Dynamic Systems, Measurement, and Control
DOI:https://doi.org/10.1115/1.4049565· OSTI ID:1769902
 [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Marquette Univ., Milwaukee, WI (United States)

Artificial muscles (AMs) typically rely on pneumatic sources of fluid power. The use of hydraulics can increase the power and force to weight and volume ratios of AM actuators. This paper develops a control-centric third-order single-input single-output (SISO) lumped-parameter dynamic model and sliding mode position controller based on Filippov's principle of equivalent dynamics for a braided hydraulic artificial muscle (HAM) actuator. The model predicts the nonlinear behavior of the HAM free contraction and captures the fluid and actuator nonlinear dynamic interactions in addition to the braid deformation. Model simulations are compared to experimental results for quasi-static pressurization, isometric pressurization, and open-loop square wave commands at 0.25, 0.5, and 1 Hz. Experiments of sine wave tracking at 0.25, 0.5, and 1 Hz and continuous square wave tracking at 0.067 Hz are conducted using a sliding mode controller (SMC) derived from the model. The SMC achieves a steady-state error of 6 μm at multiple setpoints within the actuator's 17 mm stroke. Compared to a proportional-integral-derivative (PID) controller, the SMC root-mean-square (RMS) error, mean error, and absolute maximum error are reduced on average by 53%, 61%, and 44%, respectively, demonstrating the benefit of model-based approaches for controlling HAMs.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1769902
Report Number(s):
SAND-2020-3775J; 685143
Journal Information:
Journal of Dynamic Systems, Measurement, and Control, Vol. 143, Issue 5; ISSN 0022-0434
Publisher:
ASMECopyright Statement
Country of Publication:
United States
Language:
English

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Design and Control of a Sleeve Muscle-Actuated Robotic Elbow journal April 2014
A High Performance Pneumatic Force Actuator System: Part II—Nonlinear Controller Design journal June 1999
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Designing an Input-Linearized Adaptive Sliding Mode Coupled Nonlinear Integral Controller journal December 2018
Nonlinear Control of Robotic Manipulators Driven by Pneumatic Artificial Muscles journal February 2016
Experimental Characterization and Static Modeling of McKibben Actuators journal August 2009
Theoretical Dynamic Modeling and Validation of Braided Pneumatic Artificial Muscles journal December 2019
Robust and Accurate Closed-Loop Control of McKibben Artificial Muscle Contraction with a Linear Single Integral Action journal June 2014
The effect of geometry and material properties on the performance of a small hydraulic McKibben muscle system journal October 2015
Reconsidering the McKibben muscle: Energetics, operating fluid, and bladder material journal September 2014
Thermally activated paraffin-filled McKibben muscles journal July 2016
Dynamic modeling of a pneumatic muscle actuator with two-direction motion journal March 2015
Braid Effects on Contractile Range and Friction Modeling in Pneumatic Muscle Actuators journal April 2006
Variable stiffness Mckibben muscles with hydraulic and pneumatic operating modes journal April 2016
Using Feedback Linearization to Improve the Tracking Performance of a Linear Hydraulic-Actuator journal September 2017
Modeling and Implementation of the McKibben Actuator in Hydraulic Systems journal December 2018
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A proposal of a new rotational-compliant joint with oil-hydraulic McKibben artificial muscles journal May 2018
High-Gain-Observer-Based Integral Sliding Mode Control for Position Tracking of Electrohydraulic Servo Systems journal December 2017
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Practical Tracking Control of Linear Motor With Adaptive Fractional Order Terminal Sliding Mode Control journal December 2017

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