Resonant frequency control device and method for gearbox left suspension

The invention discloses a resonant frequency control device and method for a gearbox left suspension. The device comprises a power source, a metal block, an electromagnet, a sensor, a sound collectorand a controller, wherein the metal block, the electromagnet, the sensor, the sound collector and the controller are connected with the gearbox left suspension. The power source is used for providingreal-time electric currents for the electromagnet. The metal block is used for controlling the targeted resonant frequency of the gearbox left suspension. The electromagnet is electrically connected with the power source and used for generating electromagnetic force to adsorb the metal block. The sound collector is used for collecting gearbox sound information transmitted into a vehicle by a gearbox. The sensor is arranged on the gearbox left suspension and used for detecting the real-time resonant frequency of the gearbox left suspension. The controller is used for acquiring the squeaking frequency of the gearbox acco