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Control method of pseudo-force intensity by voltage change using software signal

In this study, we propose a control method of pseudo-force intensity, (PFI) using a software signal, in pseudoforce devices. Pseudo-force is a virtual tractive force, perceived by holding an asymmetrically accelerating vibrator. Asymmetrically accelerating vibrators were reported to vary PFI by altering the voltage. The voltage could be altered directly by employing this method with digital signals. The voltage was altered by using the pulse width modulation (PWM) control method to regulate the PFI variations. The PWM method controlled the output voltage by switching the input voltage for constant periods. Here, we used the pulsed signal to represent the PFI and change the voltage. PFI was evaluated as the experimental weights’ tractive force. The vibrator and weights were connected by a wire. Subjects held the vibrator, experienced its pseudo-force, and recorded their experiences. The duty ratios of the pulse signal were varied for altering the voltage. The PFI increased with an increase in HFP duty ratio. PWM could effectively control PFI, according to the alteration in the voltage.