A basic study on influence of jerk on riding comfort using active seat suspension for ultra-compact mobility

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1505-1513
Author(s):  
Keigo Ikeda ◽  
Ayato Endo ◽  
Ryosuke Minowa ◽  
Hideaki Kato ◽  
Takayoshi Narita
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Automobile Industry ◽  
Research Group ◽  
Ride Comfort ◽  
Voice Coil Motor ◽  
Psychological State ◽  
Basic Study ◽  
Seat Suspension ◽  
Low Weight

In the current automobile industry, the demand for ultra-compact vehicles as a means of transportation for elderly people and other travelers, has been increasing. The effect of vibration on the ride comfort of these vehicles is significant because of their small size and low weight. The vibration will increase the discomfort perceived by persons in the vehicle. Therefore, it is necessary to develop a vibration control system for safe and comfortable driving. To improve ride comfort, this research group proposed an active seat suspension using a voice coil motor at the seat section of the vehicle. In this study, the influence of jerk on the psychological state, which was obtained from bioinstrumentation, was investigated.

scholarly journals Ride Comfort Control System Considering Physiological and Psychological Characteristics: Effect of Masking on Vertical Vibration on Passengers

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 42 ◽  
Author(s):  
Keigo Ikeda ◽  
Ayato Endo ◽  
Ryosuke Minowa ◽  
Takayoshi Narita ◽  
Hideaki Kato
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Ride Comfort ◽  
Control Method ◽  
Vertical Vibration ◽  
Psychological Characteristics ◽  
Psychological State ◽  
Vibration Acceleration ◽  
Seat Suspension ◽  
Vibration Stress

Active seat suspension has been proposed to improve ride comfort for ultra-compact mobility. Regarding the ride comfort of passengers due to vertical vibration, the authors have confirmed from biometry measurements that reduction of the vibration acceleration does not always produce the best ride comfort for passengers. Therefore, heart rate variability that can quantitatively reflect stress is measured in real time, and a control method was proposed that feeds back to active suspension and confirms its effectiveness by fundamental verification. In this paper, we will confirm the influence of the vibration stress on the psychological state of the occupant by the masking method.

1C11 Basic Study on a Vibration Control System Using a Variable-Pitch Propeller For Crane Load

2010 ◽  
Vol 2010 (0) ◽  
pp. _1C11-1_-_1C11-5_ ◽  
Author(s):  
Noriyuki Takasaki ◽  
Fumiya Yonekura ◽  
Toru Watanabe ◽  
Kazuto Seto
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Basic Study ◽  
Variable Pitch

scholarly journals Experimental analysis of vibration control algorithms applied for an off-road vehicle with magnetorheological dampers

2018 ◽  
Vol 37 (3) ◽  
pp. 619-639 ◽  
Author(s):  
Piotr Krauze ◽  
Jerzy Kasprzyk ◽  
Andrzej Kozyra ◽  
Jaroslaw Rzepecki
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Experimental Analysis ◽  
Ride Comfort ◽  
Inverse Model ◽  
Velocity Estimation ◽  
Magnetorheological Damper ◽  
Control Algorithms ◽  
Magnetorheological Dampers ◽  
Road Vehicle

The paper presents an experimental analysis of the selected feedback vibration control schemes dedicated to magnetorheological dampers, related to ride comfort and road holding. They were applied in a complex vibration control system installed in a commercially available off-road vehicle. Original shock-absorbers of the vehicle were replaced with magnetorheological dampers. The control system takes advantage of numerous sensors installed in the vehicle tracking its motion, i.e. accelerometers, suspension deflection sensors (linear variable differential transformer) and IMU module. Vibration control algorithms: Skyhook, PI, and Groundhook were tested experimentally using mechanical exciters adapted for diagnosis of a vehicle suspension system. Since the presented semi-active vibration control requires the magnetorheological damper inverse model to be applied, accurate operation of this model significantly influences the quality of vibration control. Therefore, additional analysis was related to application of measurements from accelerometers or suspension deflection sensors in the inverse model. Presented variants of control algorithms were compared by means of transmissibility characteristics evaluated in the frequency domain as well as using ride-comfort- and driving-safety-related quality indices. It was confirmed that the Skyhook control as well as PI improved ride comfort, whereas Groundhook control improved road holding and decreases vibration of the wheels. Furthermore, it was shown that both approaches to the relative velocity estimation, based on accelerometers and linear variable differential transformers, can be used in this application. However, the first solution gives better results in the case of the Skyhook and PI control, whereas application of LVDT sensors is better for the Groundhook algorithm.

scholarly journals 1D1-5　Development of Ride Comfort Control System for Ultra Compact Mobility :Experimental Study on Vibration Control

2019 ◽  
Vol 55 (Supplement) ◽  
pp. 1D1-5-1D1-5
Author(s):  
Keigo IKEDA ◽  
Ryosuke MINOWA ◽  
Ayato ENDO ◽  
Hideaki KATO ◽  
Takayoshi NARITA
Keyword(s):  
Experimental Study ◽  
Control System ◽  
Vibration Control ◽  
Ride Comfort

Ride Comfort Control System Considering Driver’s Psychological State

2019 ◽  
Vol 2019 (0) ◽  
pp. S23106P
Author(s):  
Keigo IKEDA ◽  
Ryousuke MINOWA ◽  
Ayato ENDO ◽  
Hideaki KATO ◽  
Takayoshi NARITA
Keyword(s):  
Control System ◽  
Ride Comfort ◽  
Psychological State

Semi-active vibration control of an 8x8 armored wheeled platform

2016 ◽  
Vol 24 (2) ◽  
pp. 283-302 ◽  
Author(s):  
MW Trikande ◽  
NK Karve ◽  
R Anand Raj ◽  
VV Jagirdar ◽  
R Vasudevan
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Vibration Control ◽  
Ride Comfort ◽  
Control Strategies ◽  
Active Vibration Control ◽  
Active Suspension ◽  
Fire Control ◽  
Ride Control ◽  
Active Vibration

This study proposes skyhook and fuzzy logic based semi-active control strategies to isolate sprung mass motions of 8x8 military vehicle and provide ride quality, road holding and firing accuracy for a platform, removing the passivity constraints of semi-active suspension system. The governing differential equations of motion of 8x8 platform for semi-active vibration control are formulated analytically and validated under multi body dynamics environment. Sprung mass acceleration and displacement are measured on a quarter car set up experimentally to assess the efficacy of skyhook and fuzzy logic controllers. Control strategies, viz. continuous skyhook control, cascade loop control and cascade loop with ride control are implemented. Cascade loop with ride control is employed such that the outer loop stabilizes heave, pitch and roll motions of full vehicle whereas the inner loop, through fuzzy controller, isolates vehicle from uneven disturbances. Various parametric studies are also performed with 8x8 semi-active suspension systems in terms of stochastic road inputs to represent cross country terrain profile. Furthermore, effect of proposed strategies on ride comfort, road holding, amplitude and settling time of vehicle body motions after firing large projectile from gun and aiming accuracy of the fire control system are investigated. It is demonstrated that cascade loop with ride control in semi-active mode improves vehicle ride comfort and road holding and accuracy of fire control system and rate of fire of gun.

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