Dissertation Defense: New paradigms to control coupled powertrain and flexible frame motions using concurrent passive and active mounting schemes

Committee:

• Prof. Rajendra Singh, Chair (ME)
• Prof. Manoj Srinivasan (ME)
• Prof. Vishnu Bab Sundaresan (ME)
• Prof. Vadim Utkin (ECE)
• Dr. Jason T. Dreyer (ME)

Summary:

The topic of this scholarly research is motivated by the need for superior control of a vehicle powertrain vibration, commonly accomplished using 3 or 4 passive mounts. However, emerging design trends (such as higher power density powertrains and lightweight structures) necessitate a hybrid approach utilizing active and passive methods to meet more stringent system performance targets. The chief research objective is to acquire fundamental understanding of dynamic interactions among multiple active and passive paths in a powertrain mounting system for improved control of multi-dimensional motion, in the presence of a compliant frame. All hybrid paths are assumed to be an actuator in series with an elastomeric mount; and discrete linear time-invariant deterministic systems are assumed with small motions, harmonic excitations, steady state behavior, and no kinematic nonlinear effects. Also, passive elements are assumed massless while active elements possess mass. 

Additionally, passive torque roll axis motion decoupling concepts are explored to enhance active control capabilities given certain practical constraints. Analytical, computational, and experimental methods are utilized though no real-time control is done.