Abstract
The goal of this study was to demonstrate the feasibility of a novel fail-safe, bi-directional liquid spring, controllable magnetorheological fluid damper (BDLS-CMRD). This research introduces a device with independently pre-set spring forces in compression and rebound combined with controllable MR fluid damping. The BDLS-CMRD can potentially replace traditional metal spring-damper suspension systems. Bulky and heavy metal spring-damper suspension systems can be upgraded to the smaller and lighter BDLS-CMRD, reducing the mass of vehicle suspensions. In this work, a BDLS-CMRD was designed, fabricated, tested and evaluated in three phases. The first design phase demonstrates the concept of a liquid spring with different spring forces in compression and rebound. The second phase incorporates viscous fluid damping of pure silicone fluid with the first phase BDLS. The final design phase combines a controllable magnetorheological fluid (MRF) damper with the first phase BDLS. This study presents the response of the BDLS-CMRD in a wide range of preloaded conditions and frequencies. Experiments were performed for sinusoidal displacements in the quasistatic and dynamic ranges to evaluate the performance of the BDLS-CMRD under different magnetic fields. The experimental results demonstrate that the device operates with significantly different spring forces from the compression to rebound regions, while providing passive viscous fluid damping or controllable MR fluid damping. This system has successfully demonstrated that the utility of a bi-directional liquid spring can be combined with the reliability of passive viscous fluid damping and the capabilities of controllable MR fluid damping into one compact and versatile device.
Highlights
The role of vibration and shock isolation has been filled traditionally by heavy metal springs and passive dampers
A system is proposed to demonstrate the feasibility of combining a bi-directional liquid spring capable of acting independently in compression and rebound with fail-safe passive viscous fluid damping and controllable MR fluid damping
A theoretical model is developed for the design and characterization of the BDLS-CMRD
Summary
The role of vibration and shock isolation has been filled traditionally by heavy metal springs and passive dampers. These traditional suspension systems are heavy and bulky. To make vehicles lighter and more adaptable, buildings and structures more resilient, and sensitive instruments more durable, a complete suspension system upgrade and replacement is necessary. This proposed system presents such a system. Double acting or bi-directional liquid springs are devices capable of reaction forces in both compression and rebound. Similar to traditional metal springs, the reaction forces of a bi-directional liquid
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