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An analytical approach to developing motorcycle suspensions is presented. Typical uncontrolled and subjective evaluations that place limits on suspension development are curtailed through the use of a laboratory-based road simulation technique, which evaluates vehicle ride quality. Ride comfort is calculated using a specifically tailored NASA model after primary and secondary frequency regimes have been established for this type of motorcycle. Correlation between road and laboratory simulation is measured and compared to the road data variance. A designed experiment evaluates changes in ride quality as a function of suspension and tire pressure adjustments. Various suspension settings are repeated on the simulator and corresponding ride numbers are calculated for both environments. An analysis is performed to correlate ride quality improvements on the simulator with ride quality improvements in the field.

Laboratory simulation methods have been used for many years in the automotive industry to accelerate durability testing of vehicle chassis and suspension members. Laboratory simulation technology is now being applied successfully to motorcycle development programs. Laboratory simulation methods and technologies provide several advantages over conventional proving grounds test methods. Typically, laboratory testing reduces testing time and cost, provides more repeatable tests, reduces maintenance and eliminates weather delays, does not require a running engine or drivetrain, and generally has fewer uncontrolled variables. Usage data is recorded in the form of suspension reaction forces, moments, or motions as an input to the simulation process. These inputs are simulated, and this data can be readily fed back to the design team to help refine FEA models for design improvements.