Controls of hydraulic wind power transfer

Abstract:To improve vehicle fuel economy whilst enhancing road handling and ride comfort, power generating suspension systems have recently attracted increased attention in automotive engineering. This paper presents our study of a regenerative hydraulic shock absorber system which converts the oscillatory motion of a vehicle suspension into unidirectional rotary motion of a generator. Firstly a model which takes into account the influences of the dynamics of hydraulic flow, rotational motion and power regeneration is developed. Thereafter the model parameters of fluid bulk modulus, motor efficiencies, viscous friction torque, and voltage and torque constant coefficients are determined based on modelling and experimental studies of a prototype system. The model is then validated under different input excitations and load resistances, obtaining results which show good agreement between prediction and measurement. In particular, the system using piston-rod dimensions of 50-30 mm achieves recoverable power of 260 W with an efficiency of around 40% under sinusoidal excitation of 1 Hz frequency and 25 mm amplitude when the accumulator capacity is set to 0.32 L with the load resistance 20 Ω. It is then shown that the appropriate damping characteristics required from a shock absorber in a heavy-haulage vehicle can be met by using variable load resistances and accumulator capacities in a device akin to the prototype. The validated model paves the way for further system optimisation towards maximising the performance of regeneration, ride comfort and handling.

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“…Solving Equation (29) obtains the electrical current and then provides the voltage prediction Upre(kV,i,Rin,j) across the external resistances under a number of incremental voltage constants kV,i and internal resistances Rin,j. The minimum value of the least square error between the measured and the predicted voltage according to Equation (32) can then be derived as follows:…”

Section: Power Regeneration Systemmentioning

confidence: 99%

“…The internal flow leakage in the motor is considered as a development and a more accurate hydraulic motor flow rate can be expressed [32]:…”

Section: Flow Through the Hydraulic Motormentioning

confidence: 99%

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A novel fault diagnosis method for rotating machinery based on S transform and morphological pattern spectrum

Gao

¹

,

Wang

²

,

Zhang

³

et al. 2015

J Braz. Soc. Mech. Sci. Eng.

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Abstract:To improve vehicle fuel economy whilst enhancing road handling and ride comfort, power generating suspension systems have recently attracted increased attention in automotive engineering. This paper presents our study of a regenerative hydraulic shock absorber system which converts the oscillatory motion of a vehicle suspension into unidirectional rotary motion of a generator. Firstly a model which takes into account the influences of the dynamics of hydraulic flow, rotational motion and power regeneration is developed. Thereafter the model parameters of fluid bulk modulus, motor efficiencies, viscous friction torque, and voltage and torque constant coefficients are determined based on modelling and experimental studies of a prototype system. The model is then validated under different input excitations and load resistances, obtaining results which show good agreement between prediction and measurement. In particular, the system using piston-rod dimensions of 50-30 mm achieves recoverable power of 260 W with an efficiency of around 40% under sinusoidal excitation of 1 Hz frequency and 25 mm amplitude when the accumulator capacity is set to 0.32 L with the load resistance 20 Ω. It is then shown that the appropriate damping characteristics required from a shock absorber in a heavy-haulage vehicle can be met by using variable load resistances and accumulator capacities in a device akin to the prototype. The validated model paves the way for further system optimisation towards maximising the performance of regeneration, ride comfort and handling.

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“…Various studies [9][10][11][12][13][14][15] have proposed the use of hydrodynamic, hydrostatic, or mechanical continuously variable transmissions (CVT) instead of using fixed or variable speed gearboxes; the objectives of incorporating a CVT to replace the gearbox are to improve the overall reliability of the wind turbine, reduce the weight of the nacelle components, reduce down-time, and significantly reduce the cost of installation and operation. The use of power electronics systems used to convert the electric output of the generator with the grid is known [11] to reduce the captured wind power in the 93-94% range for wind speeds between 6 and 11 m/s.…”

Section: Introductionmentioning

confidence: 99%

Variable Ratio Hydrostatic Transmission Simulator for Optimal Wind Power Drivetrains

Garcia-Bravo¹,

Ayala-Garcia²,

Cepeda-Aguilar³

2017

International Journal of Rotating Machinery

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This work presents a hydromechanical transmission coupled to an electric AC motor and DC generator to simulate a wind power turbine drive train. The goal of this project was to demonstrate and simulate the ability of a hydrostatic variable ratio system to produce constant electric power at varying wind speeds. The experimental results show that the system can maintain a constant voltage when a 40% variation in input speed is produced. An accompanying computer simulation of the system was built and experimentally validated showing a discrete error no larger than 12%. Both the simulation and the experimental results show that the electrical power output can be regulated further if an energy storage device is used to absorb voltage spikes produced by abrupt changes in wind speed or wind direction.

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Controls of hydraulic wind power transfer

Cited by 26 publications

References 18 publications

Modelling, Testing and Analysis of a Regenerative Hydraulic Shock Absorber System

Modelling, Testing and Analysis of a Regenerative Hydraulic Shock Absorber System

A novel fault diagnosis method for rotating machinery based on S transform and morphological pattern spectrum

Variable Ratio Hydrostatic Transmission Simulator for Optimal Wind Power Drivetrains

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