Design and dynamics study of very low frequency vibration isolation system for deep Earth airborne electromagnetic method

Because the secondary field signals of the exploration target are faint, the airborne electromagnetic exploration system must have excellent vibration isolation and noise reduction performance to collect High quality low frequency signal of deep target satisfactorily. The cylinder-type pneumatic vibration isolation system is constructed based on the pneumatic transmission concept. The nonlinear dynamic model is established based on thermodynamics and aerodynamics. Matlab/Simulink is used to simulate its dynamic performance so that the time domain and frequency domain characteristics of its vibration are simulated and analyzed. The resonance frequency of the pneumatic suspension can be as low as 0.5 Hz, and the amplitude ratio of the resonance point is less than 1.8 The influence of the auxiliary chamber volume and orifice area on its vibration isolation performance is investigated, providing theoretical guidance for the optimal selection of design parameters. The simulation and laboratory experiments and airborne electromagnetic exploration system flight tests of AEM were carried out and the results show thatthe cylinder-type pneumatic vibration isolation system performed admirably, which has good vibration isolation performance and can quickly attenuate and efficiently isolate large vibrations. As a result, it satisfies the requirement for vibration isolation systems in airborne electromagnetic exploration systems.