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Comparative Vibration Isolation Assessment of Two Seat Suspension Models with Different Negative Stiffness Structure
Abstract:
This study proposes two isolation models of the negative stiffness structure
(NSS) using the air spring (NSS-AS) and the tuned mass damper (NSS-4) to improve
the ride comfort of electric vehicles (EV). The dynamic models of the EV and the
driver body are established under the vibration excitations of the in-wheel
motor (IWM) and random road surface. Based on the root-mean-square acceleration
of the driver’s head (a
w1), the seat suspension models equipped with the
NSS-AS and NSS-4 are simulated to evaluate their isolation performance in
improving the EV ride comfort under various conditions. The research results
show that when the EV is moving on the road surface of ISO level A at a speed of
20 m/s, both NSS-AS and NSS-4 added into the seat suspension can better improve
the driver’s ride comfort in comparison to that without NSS. Especially, the
a
w1 with the NSS-AS is decreased by 18.7% in
comparison with the NSS-4. In addition, at the high-speed region over 22.5 m/s
of the EV moving on the different road surfaces of ISO levels A, B, and C, the
a
w1 with the NSS-4 is quickly increased and higher
than that of the NSS-AS, while the a
w1 with the NSS-AS is slowly increased. Moreover,
under the effect of the eccentricity of the rotor and total mass of the motor
rotor and tire, the a
w1 with the NSS-AS is also lower than that of the
NSS-4. Therefore, the driver’s ride comfort and the isolation performance of the
seat suspension using the NSS-AS are better than that of the NSS-4. This means
that the NSS-AS should be applied to the EV seat suspension to better improve
ride comfort.