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Masao NAGAI, Hidehisa YOSHIDA, Shingo MAKISHIMA, Takayuki TOHTAKE
Article type: Article
Session ID: 4005
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Although the weight of passengers can be considered as an increment of carbody mass itself in design of train carbodies, it has been shown that the passengers mass does not behave as a mere increase in mass because of the existing coupled vibration between passengers and carbody. This study clarifies the coupled passenger-carbody vibration, and proposes a new model to design lightweight and comfortable railway vehicles using biomechanics. This paper shows experiment of coupled passenger-carbody vibration with new simulator that mimics the coupled passenger-carbody vibration. This paper describes a synthesis of a new passenger model to make consistency the experiment result. Computer simulation using analytical model shows that the experimental result of vibration characteristics can be identified by passenger model, which has only 1 degree-freedom.
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Masashi MAKITA, Chinmoy PAL
Article type: Article
Session ID: 4006
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Hiroshi Sakuyama, Etsunori Fujita, Hiroki Ohimo, Shigehiko Kaneko, Mas ...
Article type: Article
Session ID: 4007
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Spring constant and dairying coefficient are changed by a variable magnetic circuit. It was achieved changing vibralaions input from cars to occupants into people friendly one by overlapping low frequency vibrations created by the magnetic circuit.
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Yoshinori Yamamura, Yoji Seto
Article type: Article
Session ID: 4008
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This study examined a control method for an ACC system capable of substantially improving string stability by means of vehicle-to-vehicle communication. The ACC system detects the operational status of each vehicle and controls the host vehicle's speed so as to obtain natural vehicle behavior. That is done in such a way that no overshooting occurs in the response characteristic of the host vehicle's speed to the lead vehicle's speed. This performance is achieved even in situations where string stability is relatively poor, such as when multiple vehicles present between the lead vehicle and the host vehicle decelerate and large vehicle speed overshoot occurs. This paper describes the effectiveness of the system and presents experimental and simulation results to illustrate its performance.
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Takayuki TOHTAKE, Takayoshi KAMADA, Masao NAGAI
Article type: Article
Session ID: 4009
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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In recent years, railway vehicles are becoming lighter since it corresponds to improvement on the running speed. However, this affects degree of ride comfort as the increase of bending vibration for due to the deterioration of the body rigidity. Recently the piezo-electric elements are paid attention as an actuator for structures in order to control vibration. This is referred as the smart structure concept. A piezo-electric element has characteristic that is small, light and high output. Therefore, the objective of this research is to reduce bending vibration by embedding piezo-electric element in the body. Consegueutly, the experimental setup is built up which can simulate bending vibration with consistency to simulation. And, the effectiveness of the controller designed by using the H_∞ control theory is verified. In this report, the effect of the vibration control by varying the installation position of the piezoelectric element is examined.
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Tetsuya KANEKO, Hisashi IIZUKA, Ichiro KAGEYAMA
Article type: Article
Session ID: 4010
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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An articulated bus plays an important role as a medium transportation vehicle in cities. This can be attributed to its high mobility and its ability to bend at its connection with a small revolution radius. This paper proposes a steering control strategy for articulated buses equipped with an all-wheel steering system to eliminate off-tracking. In this system, the center of each axle passes through the same locus, which is similar to the operation of trains. This control system was validated by means of a numerical simulation using a vehicle dynamics model and some experiments with scaled model vehicles.
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Shigeyuki KOJIMA, Etsunori FUJITA, Kazuhiko FUJIKAWA, Noritoshi NAKAGA ...
Article type: Article
Session ID: 4011
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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The vibration model which has a variable spring constant according to each frequency was conceived to keep a high vibration absorption performance in high frequency and to reduce a resonance point by greatening damping ratio in resonance area. This vibration model is applied to an automobile seat and then its vibration ride comfort was evaluated. This study reports the way of thinking about mechanism of design for impact reduction and vibration absorption and also a finding about a prediction of an occupant state by physiological approach.
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Kazuhiko Itoh, Makoto Katoh, Yuya Tokunaga, Xue Li
Article type: Article
Session ID: 4012
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper presents some results on a stochastic simulation analyzing the getting on and off person number and the waiting time for single-deck and double-deck car elevators. The both complex sequence controls were arranged based on each stale transition graphs. Then, the simulations are assumed that the passenger's arrival at the first floor hall is a discrete, rare phenomenon, and the average arrival rate follows Poisson distribution.
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Ryo IWAKI, Tetsuya KANEKO, Ichiro KAGEYAMA
Article type: Article
Session ID: 4013
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper is concerned with a driver's behavior of heavy-duty vehicle on car following condition using the driver model. Firstly, we focus on the way for drivers to get some information. The model describes for two control parts of drivers, one is the feed-forward control, and the other is feed-back control. The feed-forward model by using of multiple regression analysis was constructed in consideration of time delay and cut-off frequency of information. Furthermore, the feedback model of the part which cannot be described by the feedforward control is constructed. The fore and aft control model is constructed using combination between feed forward model and feedback model. Finally, it is shown that the driver model constructed in this research expressed actual driver behavior well.
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Ichiro KAGEYAMA, Masahiro KUSAKARI
Article type: Article
Session ID: 4014
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper concerns with construction of a riding simulator for two-wheeled vehicle. To analyze the rider's control behavior, the riding simulator constructed with this research can simulate two-wheeled vehicle movement between input and output. Furthermore, this simulator is planned for analyzing riders' human factor and also for the HMI. In the control system design, it is planned by newly using DSP for the reliability of experimental conditions, and for efficient change of the vehicle parameter for the simulation. As a result, the riding simulator system with good experimental efficiency was constructed.
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Hiroki YAMAMOTO
Article type: Article
Session ID: 4015
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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A motion analysis based on quaternion processing was performed on an acceleration data acquired with an on-board recorder at usual driving. Three dimensional acceleration time series data was transformed into a quaternion spectral coefficient series. Major motion components were extracted according to the index values estimated from those coefficients. And its phase information could be observed on the display with the ellipses and a color bar code. The characteristics of those components corresponded to the dynamic states of the vehicle's motion. Such analysis is useful as a tool for rapid access to the desired part of huge acceleration database or the long data record.
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Shinichiro Maeda, Etsunori Fujita, Yumi Ogura, Shigehiko Kaneko
Article type: Article
Session ID: 4016
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Recently, a system which can monitor a car driver's biological condition and warn the driver of drowsiness is being proposed. Many researchers have presented evidence that biological signals like brain waves, pulsation waves, and cardiac beat, are different between a wakeful state and a sleep state. However, current systems to measure those signals are assumed to be used in a laboratory or with invasive monitoring. We report on an Air-pressure sensor which is a noninvasive, biological signal-gathering sensor which goes on the car seat. It can measure body signal through the buttocks using a pulse wave-measuring instrument and a strain-type respiration-measuring device.
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Yasuhiko TAKAE, Nariaki ETORI, Takayuki WATANABE, Noriharu KUBO, Masah ...
Article type: Article
Session ID: 4017
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We studied some physiological indices to evaluate drivers' mental workload when they use driver assistance systems. In previous studies, Tissue Blood Volume (TBV) on the tip of nose and Skin Conductance Level (SCL) at palm showed good correlation with mental workload in a driving simulator experiment. In this study, these indices were investigated in on-road driving. Fifteen subjects were asked to maintain the distance to a forward vehicle that varied its own speed as an experimental task. The results showed that TBV was correlated with changes of the mental workload. Therefore TBV would be also a useful index for measuring drivers' mental workload in on-road driving.
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Yoshiki KASAYA, Motomu YOKOMORI
Article type: Article
Session ID: 4018
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This report is mental stress of the driver under driving condition in the general urban district road who car variously runs. By measuring the electrocardiogram as a biological reaction by mental strain of the driver, and doing wavelet transform of RR interval time series, the mental strain (sympathetic nerve, parasympathetic nerve) of the driver was shown in time domain, the relevance to the running velocity, acceleration, image by the video camera as a running circumstance was examined.
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Junya MIYATA, Hitoshi TSUNASHIMA
Article type: Article
Session ID: 4019
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper describes the estimation algorithm of the vehicle state and the road condition. This algorithm is formulated based on the Interacting Multiple Model (IMM) algorithm. Ten system modes of nonlinear tire are modeled according to the road friction. Changes of the ten system modes are also modeled as switching from one mode to another in a probabilistic manner. The mode probabilities and states of vehicle are estimated based on Extended Kalman Filter (EKF). This algorithm is evaluated in simulation study. Simulation results show that the algorithm is effective in the state estimation of vehicle and road surface.
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Takashi KOJIMA, Hitoshi TSUNASHIMA, Akira MATSUMOTO, Hideo NAKAMURA, H ...
Article type: Article
Session ID: 4020
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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Conditions of track have conventionally been measured using exclusive inspection vehicles. If the conditions of the track can be detected by attaching simple sensors such as accelerometers on board, more efficient maintenance of tracks would be possible. This paper describes rail corrugation detection from acceleration of a body by wavelet transform. The accelerations of axleboxes and a body measured in actual vehicle are used. It is shown that the rail corrugation can be detected by using multi-resolution analysis (MRA) from the measurement of the acceleration of vehicle body.
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Masato OGAWA, Kazuma FURUTA, Masahiro WATANABE, Nobuyuki KOBAYASHI, Hi ...
Article type: Article
Session ID: 4021
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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This paper develops the numerical model of a catenary-cable by using finite segment formulation and deals with the dynamic stability and numerical simulation of catenary-cable subjected to periodic excitation. The dynamic behavior of the catenary-cable subjected to the periodic excitation is examined by the numerical simulations and experiments. The validity of the presented analytical model is verified by the experiments. As a result, it is found that the numerical simulations are in good agreement with the experimental ones.
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Hiroaki YOSHIMURA, Tsutomu YUGI, Daisuke KASAI
Article type: Article
Session ID: 4022
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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We present a new geometric approach to constraint stabilization of holonomic constrained mechanical systems. We demonstrate how the proposed constraint stabilization method for the case of index 2 can be constructed based on geometric properties and we also illustrate the validity of the proposed approach by comparing with GGL and Baumgarte methods in numerical simulations.
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Hiroaki YOSHIMURA, Yasushi YAMASHITA, Yuji YAMADA
Article type: Article
Session ID: 4023
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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It is illustrated that a bicycle can be modeled as a multibody system with nonholonomic constraints together with numerical simulations. First, we demonstrate kinematical relations due to a spatial kinematical loop in a bicycle and nonholonomic constraints of the non-slipping condition between tires and a ground can be systematically represented by dual connection matrices. Then, we derive required equations of motion of an illustrative bicycle by using the Lagrange-d' Alembert principle. Finally, we illustrate some numerical simulations of direct dynamics using the mathematical model of the bicycle in order to show the validity of the proposed model.
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Article type: Appendix
Pages
App5-
Published: September 18, 2005
Released on J-STAGE: August 01, 2017
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