The Experts below are selected from a list of 2829 Experts worldwide ranked by ideXlab platform

Jaeduk Jang - One of the best experts on this subject based on the ideXlab platform.

  • effect of slip Controlled torque converter Damper clutch in 5 speed automatic transmission on slip rate and fuel economy
    Transactions of the Korean Society of Automotive Engineers, 2009
    Co-Authors: Geesoo Lee, Deokjung Kim, Hyunchul Kim, Hyungseok Heo, Hogil Lee, Jaeduk Jang
    Abstract:

    The objective of this paper was to investigate the slip rate and the slip frequency number of Damper clutch of torque converter in 2.4L passenger vehicle with 5-speed A/T and analyze the effect of slip control and control strategy on driving characteristics and the fuel economy. The newly developed torque converter with the more durable wet friction material and the slip-Controlled Damper clutch system, the DCC system, was installed, which was easily compatible and amendable of the lock-up clutch of the base system. The vehicle has been tested on the fuel economy modes such as FTP-75, HWFET and NEDC (ECE15+EUDC) driving cycle at chassis dynamometer. The DCC mode (II), of which the control strategy had both the lock-up and the slip-Controlled clutch, and the DCC mode (I) with full slip-Controlled clutch were compared with the base system with only the lock-up clutch. As the research result, comparison to base system, the fuel consumption of the vehicle with the DCC control (II) was effectively improved by 6.6% and 7.7% on FTP-75 and NEDC mode.

L Knap - One of the best experts on this subject based on the ideXlab platform.

  • study of a Controlled piezoelectric Damper
    Sensors, 2021
    Co-Authors: Michal Makowski, L Knap
    Abstract:

    In this work an original construction of a vibration Damper Controlled by means of a valve with a short time of operation lag is presented. The valve-controlling properties of the Damper regulates the flow of fluid between the chambers of the Damper and was constructed using piezoelectric actuators, whose characteristic feature is the possibility to change dimensions, e.g., length, under the influence of voltage. As a result, by changing voltage it is possible to control the throttle of the flow by changing the width of a gap, which influences a change of damping forces. Such a solution enables a quicker change of damping forces than in other kinds of Controlled Damper. Due to the obtained properties, the Damper may be applied to reduce the vibrations of vehicles and machines that undergo quick-change loads. In the article, the results of experimental studies of the aforementioned Damper are presented. Based on the results, dissipative characteristics were determined. Also, results of numerical studies comprising the development of a numerical model of a Controlled piezoelectric Damper are shown. Results of numerical studies, as well as experimental studies, are presented in the form of dissipative characteristics. Comparison of results of numerical and experimental studies confirms the possibility to apply this kind of construction in semi-active systems of vibration reduction of vehicles and machines.

Ebrahim Esmailzadeh - One of the best experts on this subject based on the ideXlab platform.

  • IMECE2008-69005 A NEW LUGRE FRICTION MODEL FOR MR-9000 TYPE MR Damper
    2020
    Co-Authors: Fan Yang, Ramin Sedaghati, Ebrahim Esmailzadeh
    Abstract:

    ABSTRACT This paper presents a new hysteresis model, based on the LuGre friction model, to analyze the dynamic behavior of large-scale Magneto-Rheological (MR) Damper (MR-9000 type MR-Damper [1]) accurately and efficiently. The gradient based optimization technique and the least square method will be utilized to identify the modal parameters. The dynamic behavior of MR-Damper under different types of excitation and input current have been predicted using the proposed model and then compared with those predicted using modified BoucWen model to verify the validity of the proposed model. INTRODUCTION The Magneto-Rheological (MR) fluid Dampers are one of the most promising devices to provide semi-actively Controlled Damper. Different Through comparing different numerical models for RD-1005 type , it can be found that although mos

Geesoo Lee - One of the best experts on this subject based on the ideXlab platform.

  • effect of slip Controlled torque converter Damper clutch in 5 speed automatic transmission on slip rate and fuel economy
    Transactions of the Korean Society of Automotive Engineers, 2009
    Co-Authors: Geesoo Lee, Deokjung Kim, Hyunchul Kim, Hyungseok Heo, Hogil Lee, Jaeduk Jang
    Abstract:

    The objective of this paper was to investigate the slip rate and the slip frequency number of Damper clutch of torque converter in 2.4L passenger vehicle with 5-speed A/T and analyze the effect of slip control and control strategy on driving characteristics and the fuel economy. The newly developed torque converter with the more durable wet friction material and the slip-Controlled Damper clutch system, the DCC system, was installed, which was easily compatible and amendable of the lock-up clutch of the base system. The vehicle has been tested on the fuel economy modes such as FTP-75, HWFET and NEDC (ECE15+EUDC) driving cycle at chassis dynamometer. The DCC mode (II), of which the control strategy had both the lock-up and the slip-Controlled clutch, and the DCC mode (I) with full slip-Controlled clutch were compared with the base system with only the lock-up clutch. As the research result, comparison to base system, the fuel consumption of the vehicle with the DCC control (II) was effectively improved by 6.6% and 7.7% on FTP-75 and NEDC mode.

Ivan Mazůrek - One of the best experts on this subject based on the ideXlab platform.

  • Sprung mass positioning by semi-actively Controlled Damper
    'EDP Sciences', 2020
    Co-Authors: Filip Jeniš, Ivan Mazůrek
    Abstract:

    Recently, the intensive wear of rails, especially in curves of small radii and at switches, has been studied. The wear is caused by the high lateral force peak of the wheel against the rail when entering the curves. An effective solution for reducing undesirable lateral forces on the rail is to rotate the vehicle bogie in the direction of the rail curve, which influences the distribution of lateral force over the first and second wheelset. This reduces the force peak and thus the track wear. The bogie rotation is nowadays realized by actuators, which replace the yaw Dampers. However, actuator implementation is complicated, expensive, energyintensive and demanding for the performance of a fail-safe system. From this point of view, a semi-actively Controlled yaw Damper appears to be a better candidate. An algorithm such as Skyhook can hold the sprung mass in the desired position. It is believed to be possible to rotate the vehicle bogie by the special S/A control strategy of a yaw Damper. This paper deals with the possibilities and limits of the positioning of the sprung mass by the semi-actively Controlled Damper. It has been shown that the system relative attenuation and the Damper response time have the greatest influence on the mass positioning efficiency