A target-load-designable magnetic-bistable beam coupled isolator for broadband vibration isolation and high energy absorption

: Vibration isolation systems for precision instruments and aerospace equipment face growing demands, requiring the integration of broadband isolation, transient impact dissipation, and structural health monitoring. Herein, we present a stiffness-complementary magnetic-bistable beam vibration isolator with a designable target load capacity. By coupling repulsive permanent magnet assemblies with bistable beams, the system regulates its force-displacement characteristics, simultaneously improving broadband isolation and impact absorption. Through integrated theoretical, numerical, and experimental analyses, the effects of magnet surface flux density, bistable beam geometry, and array configuration on load-bearing characteristics were systematically investigated. Multi-objective optimization was performed with vibration isolation performance and energy absorption efficiency as the design objectives, leading to the determination of the optimal geometric parameters for the bistable beams. The resulting isolator achieves a peak transmissibility of 3.6 dB within 0–100 Hz, with an initial isolation frequency of 11.3 Hz and effective broadband performance above 36.8 Hz. By integrating an electromagnetic coil into the isolator, a vibration sensor was implemented, enabling real-time vibration monitoring and safety alerts. Under simulated transport vibration conditions (1.0 kg payload, peak acceleration of 33.9 m/s 2 ), the system reduced the vibration amplitude across the entire frequency range of 0–100 Hz by an average of 75.5%. In simulated transient impact scenarios (0–50 g), it attenuated the average impact acceleration by 55.4% and generated warning signals when the sensor output voltage exceeded a predefined warning threshold. This study proposes a compact, target-load-designable vibration isolator, providing an integrated solution for the reliable operation of precision equipment under complex dynamic environments.