Abstract
An experimental study was conducted to compare the performance of an in-house built novel double semi-active damper against a conventional semi-active single damper. Different performance metrics were analyzed, and the performance of the two dampers was evaluated based on these metrics. A Hybrid Skyhook–Groundhook control algorithm was developed and implemented on the variable orifice double damper. The semi-active single damper is governed via two separate control strategies, namely—Skyhook and Groundhook control, respectively. The effectiveness of each algorithm is better understood by adding a normal load on top of the Shock Dyno, thus modifying it to act as a quarter car test rig. The sprung and unsprung acceleration data are collected via the accelerometers mounted on the Shock Dyno through a Data Acquisition System. The results obtained from this experiment provide a strong basis that the semi-active double damper performs better in terms of the comfort cost than that of the commercial semi-active single dampers.
Highlights
The automotive suspension system plays a crucial role in maintaining the vehicle dynamics of the car for changes in road input and variations in the normal weight distribution
Since we are using a Double Damper, we have developed a hybrid control algorithm that employs Groundhook control on the lower damper and Skyhook control on the upper damper [22]
This paper deals with the implementation of a Hybrid Skyhook Groundhook control methodology on a novel double damper suspension system and its comparison with a conventional semi-active damper
Summary
The automotive suspension system plays a crucial role in maintaining the vehicle dynamics of the car for changes in road input and variations in the normal weight distribution. An effective suspension system ensures passenger ride comfort for unpredictable input variations, and allows a sufficient amount of tire-road contact for proper road handling. There are three commonly used suspension systems-passive, semi-active, and active suspensions with each one having its advantages and limitations over the other. Conventional passive suspension systems come with the inherent limitation that they cannot cater to both road-holding and ride comfort at the same time. A numerical simulation study conducted by Sharp and Hassan [2] shows that for obtaining the best performance from any particular type of suspension for a spectrum of different operating conditions such as road undulations, vehicle speed variations, and fixed working space, requires the adjustment of suspension parameters through wide ranges
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