Engineering HDR Seminar Series 23, 2013: Portal Axle on Off-Road Vehicles: Effect on Vehicle Handling, NVH, and Suspension Life Cycle

Mr Chong Poh Shin, Mehanical Engineering postgraduate student

Date: 2013-04-26
Time: 14:00 to 15:00
Venue: Engineering Meeting Room 1, 5-4-22


The portal axle is an off-road technology that is designed to provide better ground clearance to the vehicle. In most cases, the portal axle is mounted on either the knuckle or axle end of the vehicle which allows both the axle tube and differential casing to be mounted higher under the vehicle. This essentially allows the vehicle to have an increased ground clearance with minimal change to its centre of gravity. However, the biggest drawback of the portal axle unit is that its weight is not supported by the suspension system of the vehicle. This weight is termed unsprung mass and is known to adversely affect vehicle ride comfort and handling performance. In addition, as vibrations caused by unsprung mass is not damped/absorbed by the vehicle’s shock absorber, large increases in unsprung mass will also affect the component life cycle of the suspension components such as the control arms and knuckle due to increased vibration amplitudes. Therefore, the main objective of this research will be to objectively quantify the effects of the portal axle on the handling performance, NVH (Noise, Vibration & Harshness) and suspension life cycle of the vehicle. This will ultimately provide insight on not only the feasibility and usability of the portal axle but also on the effects of increased unsprung mass and altered suspension/steering geometry.

About the Speaker

Mr Chong Poh Shin graduated with a Bachelor of Engineering (Mechanical Engineering with Honours) from Monash University Sunway Campus in 2011. He received the best final year project award for the Mechanical Engineering Class of 2011 (2nd Semester) (Monash University Sunway Campus). He entered Monash’s post graduate program in 2012 and is currently under the supervision of Mr Edwin Sim, Dr. David Logan, Dr. N. Ramakrishnan and Mr Hiroyuki Tamai. His focus is on understanding the effects of the Portal Axle on vehicle handling, NVH and suspension component life cycle.