Takio Oya

Clarification of the mechanism of wiper blade rubber squeal noise generation

Abstract As automobiles become quieter, the noise of wiper blade rubber in motion may become a problem for passengers. To resolve this noise, especially the squeal noise, we constructed an equation of motion for the wiper blade vibration by observation and FEM stress analysis. Based on the derived equation, we discovered several important design and material items which can be utilized to reduce squeal noise.

Complete 3D Dynamic Analysis of Blade Reversal Behavior in a Windshield Wiper System

This paper details an analysis theory to simulate various dynamic characteristics of a windshield wiper system on a vehicle for the purposes of computer-aided virtual prototyping. The analytical model consists of three-dimensional (3D) mechanical models of the complete wiper system and arm & blade subsystem which carries out complex reversal behavior. The equations of motion are solved considering the vehicles 3D windshield surface data. Thus, the dynamic reaction forces in the vertical and frictional directions can be calculated at any point within the wiping pattern.

Rider control behavior to maintain stable upright position at low speed

To maintain the stability of a motorcycle in straight-ahead running, the rider steers the handlebar with his/her hands and leans his/her body to right and left on the seat at a time delay (time lag) to the motion (banking) of the motorcycles frame, and the motorcycle is moved laterally and yawed. In this report, we studied the stable regions of the time delay at the riders lean to the motorcycle banking in hand-free running at low speed by the equations of motion in which the characteristics of tire, the movement of the center of rider to right and left and motion of the steering system about the steering axis are included.

Analysis of a Human/2-wheeled-Vehicle System by ARdock

For bicycles or motorcycles that are running straight, the following conditions should be satisfied. (1) Balancing stability should be retained. (2) Directional stability (route retention) should be retained. Why can a 2-wheeled vehicle run without capsizing? This has long been a problem stimulating people’s keen interest, and the cause was once said to be gyroscopic effect. However computation reveals instantly that the gyroscopic effect is almost negligible. A 2-wheeled vehicle is intrinsically of static instability, and is liable to be overturned without control. This is because the running bicycle is continuously under the influence of many kinds of disturbances. Even the bicycle’s rider him/herself is often a cause of the disturbance. Hereafter, the disturbance shall be just called noise.