NOVELTY - The generator (100) has an annular mass (10) e.g. axlebox, resiliently connected to a body (20) by biasing devices e.g. flat annular springs (30, 50) and adapted to oscillate about an equilibrium point relative to the body with oscillation amplitude. A transducer e.g. piezoelectric transducer, converts oscillations of the mass about the point into electrical energy. A resilient device e.g. helical spring, positioned between the biasing device and the mass is deformed between the biasing device and the mass when the amplitude exceeds predetermined non-zero threshold amplitude.    USE - Electromechanical generator for converting mechanical vibrational energy into electrical energy used to power an intelligent sensor system in a vehicle.    ADVANTAGE - The generator accommodates the possibility that the amplitude of vibration or oscillation of the spring mass vary with time, in an intermittent and unpredictable manner while reducing damage from unsafe amplitudes, thus enhancing operating lifetime of the generator and providing a compact generator. The generator includes a limiter for the vibration or oscillation amplitude of the mass that does not cause any power loss from the generator when the mass oscillates with amplitude no more than particular or predetermined threshold amplitude, thus avoiding or minimizing any reduction in the energy conversion efficiency of the generator when the generator is operated in a particular or predetermined amplitude operating range, which is less than the particular or predetermined threshold amplitude.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a vehicle    (2) a method for converting mechanical vibrational energy into electrical energy using an electromechanical generator.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an electromechanical generator.    Annular mass (10)    Body (20)    Flat annular springs (30, 50)    Spring washers (40, 60)    Electromechanical generator (100)