Utilizing Voigt’s & Maxwell’s Model we can accurately depict the system. Six DOF to be excited due to inertial forces and torque produced by the main crankshaft. Also, handling and maneuverability are enhanced with higher stiffness, lower dampened engine mounts.įigure 2: Mech Model for Elastomeric Engine Mounts However, this causes increased static deflection. For this challenge, mount stiffness must be as low as possible. Ensure the natural frequency of the air-frame and support equipment is lower than that produced by the power plant.Īchieve low vibration transmission to the airplane structure and occupants.Īs engineers, we are constantly weighting out design options.

Determine motion isolation……minimize the transmitted vibration amplitude so the mounted equipment is shielded from vibrations coming from the supporting structure.Determine force isolation, often encountered in rotating or reciprocating machinery with unbalanced masses.Many times, these are used in conjunction with one another to provide design redundancy. Rubber engine mounts can be implemented through a passive system, or an active system with a control loop adjusting stiffness based on sensor input to the computer. Rubber is a viscoelastic material which enables it to be used as an isolator and as a damper with excellent results. This is primarily a rubber mount that can withstand large amounts of deformation under load with the ability to almost retain its original shape when the load is removed. However, for this project, my client chose an elastomeric mount.

Many mounts are available to isolate these frequencies. Therefore, it is vital to determine the vibration isolation characteristics. The mounting system is the primary interface between the powertrain and the frame. For example, the above image depicts two options for mounting to the firewall. The intention of this article is to describe a portion of the process required to engineer a frame and engine mounting system for a single engine aircraft.įigure 1: Many Design Options are available.

Airmount truck vibration