Daido University

About: Daido University is a education organization based out in Nagoya, Japan. It is known for research contribution in the topics: Ultimate tensile strength & Proton exchange membrane fuel cell. The organization has 209 authors who have published 423 publications receiving 3223 citations.

Drivability Control to Optimize the Operating Freedom in the Hybrid Vehicle Propelling System

Abstract: A method of drivability control is newly developed for hybrid vehicles. "Drivability control" related with driver's subjective feelings is considered for hybrid vehicles. One of the significant advantages of this method is to make the most of operating freedom in a propelling system without disturbing drive control. The purpose of this paper is to discuss the significance of the operating freedom, and then to describe the basic concept of the control method and its applications. The drivability control is performed by racking to satisfy a drive control criterion, which is given as a function of the accelerator pedal position, the vehicle velocity and its acceleration. The criterion, which does not include any characteristics of a power source, facilitates the effective utilization of the operating freedom.

A Hybrid Damper Composed of Elastomer and Piezo Ceramic for Multi-Mode Vibration Control

Abstract: This study develops a hybrid damper for multi-modal vibration by combining an elastomer and a piezo ceramic element. The basic idea is to obtain satisfactory damping in the low frequency range, where elastomer does not work well, by introducing a piezoelectric element. In this hybrid damper, the elastomer comprises a dynamic absorber with a metal plate of small mass that deals with higher-frequency vibration, while piezo ceramic comprises a shunt damper with an electric shunt circuit that works for lower-frequency vibration. The effectiveness of this approach is examined through vibration control of a cantilever beam. The aim is to suppress the 1st mode vibration with the shunt damper and the 2nd mode with the dynamic absorber. With appropriate tuning procedures for the control parameters, vibration suppression of more than 10dB is attained in each mode.

Table Tennis Game Analysis Based on a Single Camera Placed on Gymnasium Ceiling

Abstract: In this paper, we proposed a new method to identify trajectories and bound positions of a table tennis ball on the table. Our method used audio and visual signals obtained by a microphone and camera placed on the ceiling of the gymnasium. The ball was extracted from the images obtained by the camera. Our method used the fact that the shape of the ball was almost circular in the image, and we developed a rapid method to extract the ball by using image moment. Then the trajectory of the ball on the table was estimated by connecting the successive ball positions. The bound time was estimated by band-pass filtering in which pass-frequency corresponds to the resonant frequency of the ball diameter. The bound position was calculated by interpolating the position at the bound time. Our method was simple, and the computational time was less than the video frame interval. We conducted an experiment to examine the ball bound time on the table from a practice game. The experimental result showed that 98.9% of bounds can be extracted with a precision of 94.4%. The improvement of sound detection accuracy remained to be solved, in order to reduce the miss and over-detection of the bound. Furthermore, we made a manuscript for training regarding the bound position and ball speed on the table based on the obtained data. We could make document contents quickly and objec-

Accurate estimation of workpiece dimension in plunge grinding without sizing gauge

Abstract: In the cylindrical grinding process, the residual grinding allowance is left owing to the rubbing of the abrasive grains and the elastic deformation of the grinding system caused by the large normal grinding force. Therefore, a sizing gauge is generally used to monitor the workpiece diameter during the process. However, the sizing gauge disturbs the grinding operations, such as loading and unloading the workpiece. In this study, a new method for estimating the grinding stock of a ground workpiece is proposed. In the proposed method, the grinding stock can be estimated without a sizing gauge. The removed volume of the workpiece can be calculated from the power consumption of the wheel motor, which is easily measured. Before the grinding experiments, the specific grinding energy is determined from several grinding results. During the grinding process, the grinding stock of the ground workpiece was estimated using the determined specific grinding energy. It was confirmed that the grinding stock could be accurately estimated under several grinding conditions.

Captioning System with Function of Inserting Mathematical Formula Images

Abstract: We propose a captioning system with a function of inserting mathematical formula images. [We match/The system matches?] mathematical formulas presented orally during a lecture with those simultaneously projected on a screen in the lecture room. We then manually extract the mathematical formula images from the screen for displaying on the monitor of the system. A captionist can input mathematical formulas by pressing a corresponding function key. This is much easier than inputting mathematical formulas by typing. We conducted an experiment in which participants evaluated the usefulness of the proposed captioning system. Experimental results showed that 14 of the 22 participants could input more sentences when using the function of inserting mathematical formula images than when not using it. Furthermore, from the results of a questionnaire, we could confirm that the proposed system is effective.