<![CDATA[Background. Modern vehicles must prioritize comfort and safety, including the suspension system. While passive suspension systems are common, they struggle with excessive vibrations on uneven roads. Semi-active and active systems address this but are costly and complex. To solve this, a Variable Geometry Suspension (VGS) prototype was developed, integrating an active actuator into a passive system to adjust its geometry, providing performance comparable to active suspension systems. Research Purpose. This study aims to examine the effect of single-link angle variations in the Variable Geometry Suspension (VGS) prototype on bumpy roads to determine the most comfortable single-link angle. Research methods. This research employs a Research and Development (RnD) method by testing the single-link angle at 0°, 90° (reference angle), and 180°. Data collection was conducted by introducing road disturbances in the form of a bumpy road. Findings. The testing results showed that the lowest Root Mean Square (RMS) value of the sprung-mass was at a single-link angle of 90°, with an RMS value of 0.72 m/s². This indicates a "Fairly Uncomfortable" level based on ISO 2631, with the damper on the unsprung-mass (ct) and tire stiffness (kt) disregarded, as well as the weight of the sprung-mass. Conclusion. The VGS prototype's response to changes in the single-link angle on bumpy roads varies. However, the system effectively reduces vibrations at all angles, stabilizing the vehicle's body (sprung-mass) as the wheel (unsprung-mass) moves over uneven surfaces.]]>
