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Multi-Objective NSGA-II Optimization for Mitigating High-Frequency Transient Vibrations in a 5-DOF Vehicle Model |
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| รหัสดีโอไอ | |
| Creator | Kittipong Boonlong |
| Title | Multi-Objective NSGA-II Optimization for Mitigating High-Frequency Transient Vibrations in a 5-DOF Vehicle Model |
| Contributor | Puttha Jeenkour, Nantawatana Weerayuth |
| Publisher | Phetchaburi Rajabhat University |
| Publication Year | 2569 |
| Journal Title | Interdisciplinary Research Review (IRR) |
| Journal Vol. | 21 |
| Journal No. | 5 |
| Page no. | 60-70 |
| Keyword | Multi-Objective Optimization, Genetic Algorithm, Vehicle Suspension, High-Frequency Transient Response, NSGA-II |
| URL Website | https://ph02.tci-thaijo.org/index.php/jtir |
| Website title | Interdisciplinary Research Review (IRR) |
| ISSN | 2697-536X |
| Abstract | Ride comfort in ground vehicles is governed not only by the steady-state response of the suspension to road excitation but also by transient, high-frequency oscillations arising from the system's homogeneous (free-vibration) response. This study was conducted through comprehensive numerical simulation to formulate suspension design as a multi-objective optimization problem. A five degree of freedom (5-DOF) lumped parameter vehicle model captures body heave, pitch, and unsprung mass dynamics. Seven suspension and seat design variables are optimized with the Non-dominated Sorting Genetic Algorithm II (NSGA-II) against two objectives: (i) the root mean squared seat acceleration over an 8-second simulation window, and (ii) a frequency-weighted measure of the damped natural-frequency components above 5 Hz, extracted from the transient response via windowed Fourier analysis. The framework is evaluated across a range of forcing frequencies under two deterministic time-varying road inputs: an isolated double bump and a periodic pulse train. NSGA-II returns a well-distributed Pareto front, giving designers an explicit trade-off between overall ride comfort and rapid attenuation of high-frequency transients. Solutions selected purely for minimum seat acceleration at the nominal 1 Hz forcing frequency degrade sharply as the forcing frequency increases; solutions that also account for the high-frequency objective retain stable performance and often achieve lower seat acceleration than the single-objective optimum. These results indicate that jointly minimizing the homogeneous high-frequency response alongside steady-state seat acceleration yields robust suspension designs under fluctuating operational frequencies. |
