The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform

Y. J. Park - One of the best experts on this subject based on the ideXlab platform.

  • Reduction of rattle noise of a direct Engine-PTO driveline of agricultural tractors: Part II. Causes of PTO rattle noise.
    Transactions of the ASABE, 2020
    Co-Authors: Y. J. Park
    Abstract:

    To investigate the causes of the PTO rattle noise of a direct Engine-PTO driveline, a 10-degree of freedom non-linear mathematical model of the driveline was developed and verified experimentally. The model was used to simulate dynamic characteristics of the driveline motions and the effects of driveline parameters on the PTO rattle noise under the condition that generated the loudest PTO rattle noise. The results of the simulation identified that the PTO rattle noise was caused by collisions between the driving and driven gears in the PTO gearbox due to their velocity variations induced by the torque fluctuations from the Engine. It was also found that the PTO rattle noise decreased as the drag torque and the mass moment of inertia of the Engine Flywheel increased. Smaller backlash and mass moment of inertia of the driven gear also reduced the PTO rattle noise. However, increasing the drag torque and mass moment of inertia of the Engine Flywheel or decreasing the backlash and mass moment of inertia of the driven gear are not practical due to their detrimental effects on the transmission efficiency, gear strength, and smooth operations of gears. These methods are not suggested as being appropriate for solving the PTO rattle noise problem of the tractor used in this study. Instead, we recommend considering use of a torsional damper as a means of reducing velocity variations of the PTO driveline, which was a primary cause of the PTO rattle noise.

  • Reduction of Rattle Noise of a Direct Engine-PTO Driveline of Agricultural Tractors: Part III. Reduction of PTO Rattle Noise by a Torsional Damper
    Transactions of the ASABE, 2020
    Co-Authors: Y. J. Park
    Abstract:

    The PTO rattle noise of the direct Engine-PTO driveline was caused by the collisions between the driving and driven gears in the PTO gearbox due to their velocity variations induced by the torque fluctuations transmitted from the Engine (Part II, companion article). This indicated that the speed variation must be reduced to reduce the PTO rattle noise. In this study, a torsional damper was used to reduce the speed variations in the PTO driveline. A torsional damper comprised of two helical coil springs was installed on the Engine Flywheel to reduce the torque fluctuations causing the speed variations and gear collisions in the PTO gearbox during idling. The effects of design parameters of the torsional damper on the speed variation were investigated, and their optimum values were found by using an 11-degree of freedom, non-linear model of the damped PTO driveline. Under a constant hysteresis torque, the speed variation increased with the torsional stiffness of the damper. When the optimum values of the first spring were used, the sound pressure level of the rattle noise was reduced, resulting in a reduction of 15 dBA. The optimum torsional damper also reduced the velocity variation of the driving gear in the PTO gearbox, resulting in a noise reduction of 15 dBA. The torsional damper performed well in reducing the rattle noise caused by velocity variation in the direct Engine-PTO driveline.

A. M. Karmel - One of the best experts on this subject based on the ideXlab platform.

Shen Yu-feng - One of the best experts on this subject based on the ideXlab platform.

Yasuo Kita - One of the best experts on this subject based on the ideXlab platform.

  • A HYDRAULIC CONSTANT PRESSURE DRIVE SYSTEM FOR Engine-Flywheel HYBRID VEHICLES
    Proceedings of the JFPS International Symposium on Fluid Power, 1996
    Co-Authors: Hiroshi Nakazawa, Shinichi Yokota, Yasuo Kita
    Abstract:

    In order to reduce fuel consumption and exhaust gases from road vehicles in city traffic, it has been considered technically reasonable to recover vehicle kinetic energy that might otherwise be lost as heat during braking. A energy recovery system using a rotating Flywheel seems to be advantageous for vehicle applications due to its high energy density. The authors propose a Constant Pressure System (CPS) which is a simple hydraulic drive system for Enginefl ywheel hybrid vehicles. CPS can easily realize power transmission and vehicle traction control. In this study, analytical modeling and simulations for the Flywheel hybrid vehicle using CPS are presented to evaluate its fuel saving potential. Simulations were performed based on the experimental efficiency data of a FFC (Fluid Force Couple) type pump/motor. Simulation results indicate that it is possible to improve fuel economy in urban driving schedules.

J.j. Ronning - One of the best experts on this subject based on the ideXlab platform.

  • Design and testing of a belt-driven induction starter-generator
    IEEE Transactions on Industry Applications, 2002
    Co-Authors: Shaotang Chen, B. Lequesne, R.r. Henry, J.j. Ronning
    Abstract:

    The advent of higher voltages in automobiles constitutes an opportunity for new electrical features and systems. In that regard, a combined starter-generator would have several important benefits, most notably it would enable the turning off of the Engine at idle and provide efficient, high power generation, both resulting in improved fuel economy. Several ongoing starter-generator projects have focused on locating the starter-generator around the Engine Flywheel. This paper describes the design of a belt-driven alternative with an induction machine drive. The proposed system would be easier to package than a Flywheel-mounted system, since it would not affect the overall length of the powertrain. The paper presents various models as well as test results from a prototype system. Some specific implementation issues, such as induction generator stability at high speed, are also explored in some depth.

  • Design and testing of a belt-driven induction starter-generator
    IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485), 2001
    Co-Authors: Shaotang Chen, B. Lequesne, R.r. Henry, J.j. Ronning
    Abstract:

    The advent of higher voltages in automobiles constitutes an opportunity for new electrical features and systems. In that regard, a combined starter-generator would have several important benefits, most notably it would enable the turning off of the Engine at idling and provide efficient, high power generation, both resulting in improved fuel economy. Several on-going starter-generator projects have focused on locating the starter-generator around the Engine Flywheel. This paper describes the design of a belt-driven alternative with an induction machine drive. The proposed system would be easier to package than a Flywheel-mounted system, since it would not affect the overall length of the powertrain. The paper presents various models as well as test results from a prototype system. Some specific implementation issues, such as induction generator stability at high speed, are also explored in some depth.