Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification
Abstract
:1. Introduction
2. Considered Mechanical System and Its State–Space Model
2.1. Shock Absorber under Double-Impact Excitation
- Separate deceleration of the first object;
- Impact of the second object—the first is object under influence of the absorber reaction force and contact force between both decelerated objects;
- Deceleration of joint objects.
2.2. State–Space Model of the Considered System
3. Self-Adaptive Impact Mitigation Using Equivalent Parameter Predictive Control
3.1. Formulation of the Control Problem
- The sum of additional forces acting in the system is small in comparison to the pneumatic force;
- The change of the pneumatic force during a single control step is relatively small.
3.2. Derivation of Equivalent Parameter Predictive Control
- Automatic adaptation to unknown impacting object mass and its possible changes;
- Automatic adaptation to various initial velocities of the impacting object;
- Adaptation to additional external forces occurring during the process including the case of double-impact excitation;
- Robustness to process disturbances such as unknown friction forces inside the absorber.
- Numerical simulation of the system response for arbitrarily assumed change of valve opening via the arbitrary time-integration method—numerical dynamics prediction (NDP);
- Analytical simulation of the system response for selected time-histories of valve opening for which an analytical solution of the predictive model exists—analytical dynamics prediction (ADP).
4. Equivalent Parameter Predictive Control: Sub-Optimal Analytical Control Strategy
4.1. Determination of Analytical Functions Defining Change of Valve Opening
4.2. Analytical Solution of the Path-Tracking Problem
4.3. The Control Algorithm
- Identification step aimed at the measurement of actual system kinematics and values of pressures in absorber chambers, followed by identification of the equivalent mass parameter used to update the predictive model of the system;
- Prediction step including comparison of actual and optimal values of pneumatic force, and simulation of the system response with extreme valve opening in order to determine if optimal pneumatic force will be reached before the end of control step— if yes, the system starts control determination step; if not, it moves to process termination block;
- Control determination step in which constraints imposed on valve opening are transformed into constraints on vector ; optimization over vector is conducted in order to minimize path-tracking error at the actual prediction step, and termination condition is checked;
- The control execution step, which depends on the termination condition; if it is not met, the valve opening computed in the control determination step is applied at the actual control step and the system comes back to the identification step; otherwise, the full opening of the valve is applied, and the impact mitigation process is ended.
5. Numerical Verification of Equivalent Parameter Predictive Control
5.1. Single-Impact Scenario
5.2. Double-Impact Scenario with Various Excitations
5.3. Double-Impact Scenario with Various Disturbances
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
EPPC | Equivalent Parameter Predictive Control |
AIA | Adaptive Impact Absorption |
PID | Partial Integral–Differential |
MPC | Model Predictive Control |
HPC | Hybrid Prediction Control |
IPC | Identification-based Predictive Control |
FPGA | Field-programmable Gate Array |
Appendix A. Proof That Variational Formulation Given by Equation (33) Can Be Approximated by the Variational Formulation Given by Equation (34) under Specified Conditions
- i.
- When the additional force in the system tends towards zero: (trivial case);
- ii.
- When the coefficient defining the change of pneumatic force during a single control step tends towards one: , which indicates a situation when the change of pneumatic force during the considered control step is relatively small.
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Unknown ) | Unknown Disturbance Force | Unknown Fluid Leakage | Actuator Time Delay | Actuator Fault | Comments | |
---|---|---|---|---|---|---|
Standard AIA approach [35] | No | No | No | No | No | Precomputed system path |
Hybrid Prediction Control [42,43] | Yes | Yes | Yes | No | No | Updated system path, approx. solution |
Identification-based Predictive Control [44,45] | No/Yes * | Yes | No/Yes * | No/Yes * | No | Updated system path, semi-optimal solution |
Equivalent Parameter Predictive Control | Yes | Yes | No | No | No | Updated system path, multi-impact loads, numerically efficient semi-optimal solution |
Robust Fault Tolerant Predictive Control [49] | - | Yes | No | Yes | Yes | Application for industrial arm robot |
Adaptive Model Predictive Control [50] | - | Yes | No | Yes | No | Application for system with uncertainties |
Suspended Mass (kg) | Initial Velocity of the Mass (m/s) | Initial Internal Pressure in Chambers (kPa) | Operational Gas | Piston Diameter (mm) |
---|---|---|---|---|
5 | 5 | 300 | compressed air | 40 |
Initial volume of top chamber (cm3) | Initial volume of bottom chamber (cm3) | Piston initial position (mm) | Entire absorber stroke (mm) | Initial temperature of the gas (K) |
7.54 | 118.12 | 6 | 94 | 293.15 |
First Impacting Mass (kg) | Initial Velocity of the First Mass (m/s) | Second Impacting Mass (kg) | Initial Velocity of the Second Mass (m/s) |
---|---|---|---|
4 | 4.5 | 2 | 5 |
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Graczykowski, C.; Faraj, R. Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification. Sensors 2023, 23, 9471. https://doi.org/10.3390/s23239471
Graczykowski C, Faraj R. Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification. Sensors. 2023; 23(23):9471. https://doi.org/10.3390/s23239471
Chicago/Turabian StyleGraczykowski, Cezary, and Rami Faraj. 2023. "Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification" Sensors 23, no. 23: 9471. https://doi.org/10.3390/s23239471