The difference between subjective and objective Evaluation Starting Time for Riding Quality

It is difficult to represent by physical quantities all phenomena that affect riding comfort. Whereas, it is known that the most important factor is the vibration acceleration of a vehicle. Until now, the riding comfort evaluation has executed through a test run by a real train. Testing conditions are apt to change test after test. We used a simulator to reproduce the acceleration of the railway vehicle. We can repeatedly evaluate riding comfort by using this simulator. The simulator was devised by combining the universal shaking table with a translation table and an inclination table. Depending on the frequency, a program can distributes the acceleration to the above components. A subject presses a switch when the subject feels bad ride. We got two types of data from simulations. One is a subjective data, namely, the time that subjects press the switch, and the proportion of the number of subjects who pushed the switch in bad ride. The other is an objective data such as vehicle’s running acceleration, jerk, and the tensile force of a strap. In this study, we clarify the correlation between the subjective data and the objective data. Then Correlation will lead us to evaluate the riding comfort from physical quantities. However, difference between two types of data will exist. The difference is called “delay time”. In this study, we will report about the delay time.