Purpose <p>Vibration isolation plays a critical role in engineering applications, from mechanical systems to civil structures, where unwanted vibrations can lead to performance degradation, discomfort, or even structural damage. Conventional isolation systems compromise between reducing high-frequency vibrations and avoiding resonance amplification because they rely on fixed stiffness and damping settings. To overcome these challenges, this work focuses on the design, develop, and testing of a Magnetorheological Elastomer (MRE) based Variable Stiffness and Variable Damping (VSVD) vibration isolator.</p> Method <p>The synthesis of MRE was performed using various combinations of magnetic particles, and rheological studies of MR fluid were conducted using a rheometer. Simplified mathematical governing equations for the VSVD system were derived, and a two-stage VSVD prototype was conceptualized. The VSVD unit was simulated in COMSOL Multiphysics to analyze the magnetic flux density distribution in different operational modes. The simulation results indicated a uniform magnetic field in the active regions, enabling effective actuation of both the MRE and MRF elements. The operational modes were defined as follows: Passive mode- current supplied to both the MRE and MRF coils is zero; Stiffness Control ON- current is supplied only to the MRE coil while the MRF coil current remains zero; Damping Control ON - current is supplied only to the MRF coil while the MRE coil current remains zero; and Dual mode- currents are supplied to both the MRE and MRF coils simultaneously. The individual components of the VSVD system, along with the assembly, were fabricated for experimental evaluation.</p> Result <p>Testing was conducted in three phases to evaluate microstructural characteristics, field-dependent properties, and field-independent properties. Compression tests were performed, and the damping properties were evaluated. The passive damping coefficient, corresponding to the condition in which no current was supplied to either the MRE or MRF coils, was measured as 1750.12 Ns/mm. Under the dual mode operation, wherein currents were simultaneously supplied to both the MRE and MRF coils, the damping coefficient exhibited significant enhancements, reaching 1964.84 Ns/mm, 4345.38 Ns/mm, 5441.20 Ns/mm, and 5803.28 Ns/mm for the tested current levels. This represents an improvement in the damping coefficient of up to 3.3 times compared to the passive vibration isolator. The results validate the effectiveness of the MRE-based VSVD device in achieving superior vibration isolation, offering significant advancements in adaptive and tunable vibration control systems.</p>