Vibrational discomfort and motorcycle health assessment under engine excitation

Abstract

This paper evaluates the passenger discomfort and motorcycle health by assessing relevant ISO standards and referred literature. The human vibration standards evaluate general severity with frequency weightings while comfort contours from the referred literature evaluate subjective perceived sensitivity with frequency, amplitude, location, direction and driving posture conditions. Machinery standards and referred literature evaluate the grades, permissible vibrations and fault symptoms. Experiments are conducted on four leading brands of different category motorcycles. The engine is swept from low idle to rated speed and vibration signals at different locations on the engine and chassis are recorded. Ride comfort levels and health conditions of motorcycles are quantified and analysed. Experimental observations and gaps in the ISO and referred literature are discussed. The results indicated that an unweighted rating still holds good for these experiments at a selected speed in comparison to rating by ISO weightings and sensation magnitudes. of vibrations, rotor and vehicle dynamics, condition monitoring, instrumentation and signal processing. He has around 100 research papers, guided 11 PhDs and edited conferences.

Experimental Analysis of Passenger Comfort with Variable Preloaded Rear Springs on a Low-Cylinder Motorcycle

“…This behavior agrees with results of Figure 11, showing that acceleration envelope, or its corresponding area, can be used as a metric for comfort analysis too. By application of Equation (11), using a VDV time equal to 0.5, at the smooth preload the time required for severe discomfort is close to 5 h, while at the strong preload it is 20 min. At the medium preload, it is a little more than an hour.…”

“…The suspension system plays a critical role in the overall performance of a motorcycle, particularly in terms of its ability to absorb vibrations and shocks resulting from the unevenness of the road surface. In this regard, researchers have mainly focused on ergonomics, semi-active suspension systems, and vibration absorption or isolation [5,[10][11][12][13][14][15].…”

“…While structural health monitoring (SHM) is a well-established field of study to evaluate vibrations in several structures [23][24][25], its application in the context of low-cylinder motorcycles is still in its early stages. Despite its importance, only a few studies have been carried out to address this issue [6,8,11,26]. In particular, the ISO 2631 standard provides a guideline to study the performance of vehicles and machines in relation to vibrations.…”