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Anthony Paul Roskilly - One of the best experts on this subject based on the ideXlab platform.

  • recent commercial free Piston Engine developments for automotive applications
    Applied Thermal Engineering, 2015
    Co-Authors: R Mikalsen, Razali M Hanipah, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines have been under extensive investigation in recent years, however have not yet seen commercial success in modern applications. This paper reviews some of the recently reported commercial developments in free-Piston Engine systems particularly aimed for use in hybrid electric vehicle powertrains and discuss these in light of published research. By looking at recent publications, and in particular patent documents, from major industrial players, insight into the less widely reported commercial research efforts on free-Piston Engines is obtained. Further, these publications provide a useful indication as to what these developers see as the main technical challenges for this technology.

  • The control of a free-Piston Engine generator. Part 1: Fundamental analyses
    Applied Energy, 2010
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups due to potential fuel efficiency and exhaust emissions advantages over conventional technology. The main challenge with such Engines is the control of the Piston motion, and this has not yet been fully resolved for all types of free-Piston Engines. This paper discusses the basic features of a single Piston free-Piston Engine generator under development at Newcastle University and investigates Engine control issues using a full-cycle simulation model. Control variables and disturbances are identified, and a control strategy is proposed. It is found that the control of the free-Piston Engine is a challenge, but that the proposed control strategy is feasible. Engine speed control does, however, represent a challenge in the current design.

  • Coupled dynamic-multidimensional modelling of free-Piston Engine combustion. ā‹†
    Applied Energy, 2009
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The Piston dynamics of the free-Piston Engine differ significantly from those of conventional Engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-Piston Engines is not straight-forward. This paper presents a novel approach to the modelling of free-Piston Engines through the introduction of solution-dependent mesh motion in an Engine CFD code. The particular features of free-Piston Engines are discussed, and the model for Engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-Piston Engine generator.

  • coupled dynamic multidimensional modelling of free Piston Engine combustion
    Applied Energy, 2009
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The Piston dynamics of the free-Piston Engine differ significantly from those of conventional Engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-Piston Engines is not straight-forward. This paper presents a novel approach to the modelling of free-Piston Engines through the introduction of solution-dependent mesh motion in an Engine CFD code. The particular features of free-Piston Engines are discussed, and the model for Engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-Piston Engine generator.

  • performance simulation of a spark ignited free Piston Engine generator
    Applied Thermal Engineering, 2008
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups worldwide due to potential fuel efficiency and Engine emissions advantages. The free-Piston Engine generator, in which a linear electric generator is fixed to the mover to produce electric power, has been proposed as an alternative prime mover for hybrid-electric vehicles. This paper investigates the performance of a spark ignited free-Piston Engine generator and compares it to a conventional Engine using a computational fluid dynamics simulation model. The particular operating characteristics of the free-Piston Engine were not found to give noticeable performance advantages, and it is concluded that the main potential of this technology lies in the simplicity and flexibility of the concept.

R Mikalsen - One of the best experts on this subject based on the ideXlab platform.

  • recent commercial free Piston Engine developments for automotive applications
    Applied Thermal Engineering, 2015
    Co-Authors: R Mikalsen, Razali M Hanipah, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines have been under extensive investigation in recent years, however have not yet seen commercial success in modern applications. This paper reviews some of the recently reported commercial developments in free-Piston Engine systems particularly aimed for use in hybrid electric vehicle powertrains and discuss these in light of published research. By looking at recent publications, and in particular patent documents, from major industrial players, insight into the less widely reported commercial research efforts on free-Piston Engines is obtained. Further, these publications provide a useful indication as to what these developers see as the main technical challenges for this technology.

  • The control of a free-Piston Engine generator. Part 1: Fundamental analyses
    Applied Energy, 2010
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups due to potential fuel efficiency and exhaust emissions advantages over conventional technology. The main challenge with such Engines is the control of the Piston motion, and this has not yet been fully resolved for all types of free-Piston Engines. This paper discusses the basic features of a single Piston free-Piston Engine generator under development at Newcastle University and investigates Engine control issues using a full-cycle simulation model. Control variables and disturbances are identified, and a control strategy is proposed. It is found that the control of the free-Piston Engine is a challenge, but that the proposed control strategy is feasible. Engine speed control does, however, represent a challenge in the current design.

  • Coupled dynamic-multidimensional modelling of free-Piston Engine combustion. ā‹†
    Applied Energy, 2009
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The Piston dynamics of the free-Piston Engine differ significantly from those of conventional Engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-Piston Engines is not straight-forward. This paper presents a novel approach to the modelling of free-Piston Engines through the introduction of solution-dependent mesh motion in an Engine CFD code. The particular features of free-Piston Engines are discussed, and the model for Engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-Piston Engine generator.

  • coupled dynamic multidimensional modelling of free Piston Engine combustion
    Applied Energy, 2009
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The Piston dynamics of the free-Piston Engine differ significantly from those of conventional Engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-Piston Engines is not straight-forward. This paper presents a novel approach to the modelling of free-Piston Engines through the introduction of solution-dependent mesh motion in an Engine CFD code. The particular features of free-Piston Engines are discussed, and the model for Engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-Piston Engine generator.

  • performance simulation of a spark ignited free Piston Engine generator
    Applied Thermal Engineering, 2008
    Co-Authors: R Mikalsen, Anthony Paul Roskilly
    Abstract:

    Free-Piston Engines are under investigation by a number of research groups worldwide due to potential fuel efficiency and Engine emissions advantages. The free-Piston Engine generator, in which a linear electric generator is fixed to the mover to produce electric power, has been proposed as an alternative prime mover for hybrid-electric vehicles. This paper investigates the performance of a spark ignited free-Piston Engine generator and compares it to a conventional Engine using a computational fluid dynamics simulation model. The particular operating characteristics of the free-Piston Engine were not found to give noticeable performance advantages, and it is concluded that the main potential of this technology lies in the simplicity and flexibility of the concept.

Yuan Shihua - One of the best experts on this subject based on the ideXlab platform.

  • Self-excited Oscillation Control of Hydraulic Free-Piston Engine
    Journal of Mechanical Engineering, 2012
    Co-Authors: Yuan Shihua
    Abstract:

    To control the Piston motion of a single Piston hydraulic free-Piston Engine,control methods are investigated.The Piston moving mechanism is analyzed in theory.The test equipment for a prototype has been provided.The theoretical basis,control circuit and control method for the Piston motion are analyzed.The Piston frequency can be controlled by changing the delivery time of the compression power.A novel pilot control circuit is provided and a free-Piston feedback modulation control method has been developed.The flow capability of hydraulic valves is fully utilized by the circuit.The Piston extreme position is also limited by the circuit.The throttle and the leakage are main losses of the cyclic energy in the circuit.The sufficient condition for the steady operation of the single Piston hydraulic free-Piston Engine is that the integrality of the expansion process should be achieved.

  • Performances of Distributing Valves on Hydraulic Free-Piston Engine
    Transactions of Beijing Institute of Technology, 2011
    Co-Authors: Yuan Shihua
    Abstract:

    To increase the system efficiency and reliability,performances of distributing valves on a hydraulic free-Piston Engine were studied.Dynamic models of the valves combined with a fullcycle Engine model were built and a test apparatus was set up.The relations between dynamic responses of the valve spools and the pressure changing in pump chamber were analyzed via simulation and test.The influence of distributing valves' working characteristics on the system performance was investigated.The results indicate that faster close response of the inlet valve increases the Engine fuel combustion efficiency.The response lag between the outlet valve and the Piston around bottom dead centre decreases the system controllability in low working frequency. A high velocity impact between valve spool and caging device might appear in the valve opening process,which makes a fall in valve operating life.

  • Cyclic Vibration Characteristics of a Hydraulic Free-Piston Engine
    Transactions of Csice, 2010
    Co-Authors: Yuan Shihua
    Abstract:

    Cyclic vibration characteristics of a single Piston hydraulic free-Piston Engine are investigated.Nonlinear factors of the free-Piston vibration are analyzed and a nonlinear vibration model for the free-Piston is presented.An approximate solution of the model is given.Vibration characteristics are analyzed and validated by the experiment.Results indicate that the single Piston hydraulic free-Piston Engine is a self-excited vibration system with unsymmetrical restoring forces.Piston cyclic vibration is a solid selfexcited vibration and has stable limit cycles.Amplitude increases with the increase of input power and the decrease of working pressure.Under the steady amplitudes,the Piston motion is dissymmetric and maximum velocity is relatively large in the expansion stroke.

  • Simulation Study of Hydraulic Free-Piston Engine Based on AMESim/MATLAB
    Computer Simulation, 2009
    Co-Authors: Yuan Shihua
    Abstract:

    The basic operation principle of the single Piston hydraulic free-Piston Engine was introduced and the characteristics were analyzed.The single Piston hydraulic free-Piston Engine model was established depending on the co-simulation tools of AMESim/MATLAB.The dynamic performance of the working process was simulated.The dynamic characteristics of the gases pressure,fluid pressures,flow rates of the check valves and the frequency control valve were analyzed.The Piston moving characteristics were investigated.An experiment was performed with one duty cycle.According to the analysis of the simulation and experimental results,the Piston frequency is controllable and the Piston velocity is dissymmetric.The large flow capacity and very fast response characteristics of the frequency control valve are offered.It provides theory guidance for the development of the single Piston hydraulic free-Piston Engine.

Hao Deng - One of the best experts on this subject based on the ideXlab platform.

  • A twin-rotor Piston Engine with annular connecting chambers
    Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2012
    Co-Authors: Hao Deng, Xiaojun Xu, Xiang Zhang
    Abstract:

    An effort in progress to develop a new twin-rotor Piston Engine is described. A proposition of sealing, which benefits from the conventional Piston-cylinder structure is presented. A six-stroke twin-rotor Piston Engine, which is designed to have coolant intake and drain stroke is proposed. A differential velocity drive mechanism, which controls the rotorsā€™ oscillation, is invented. The differential velocity drive mechanism utilizes novel kinematic design to completely eliminate inertial loads. The twin-rotor Engine is expected to have three key technical advantages for attaining higher power density than any available Piston Engine: the first is symmetrical structure and well-balanced kinetics; the second is 16 or more power strokes per revolution of the output shaft and more than two symmetrical working chambers exporting power at any time; the third is performing the four-stroke cycle without using the valve mechanism.

  • Original design on the power transmission mechanism of a twin-rotor Piston Engine
    2011 Second International Conference on Mechanic Automation and Control Engineering, 2011
    Co-Authors: Hao Deng, Weiyang Zhang
    Abstract:

    In order to increase the power density of the Piston Engine, the power transmission mechanism of a twin-rotor Piston Engine based on differential velocity principle is introduced. Firstly, the precept of the Engine principle is developed, and the velocity of the rotors is designed, then the structure and the kinematic simulation of the power transmission mechanism are derived. The results show that the combined mechanism composed of the hypocycloidal planet gear mechanism and the crank rock mechanism can satisfy the design principle of the twin-rotor Piston Engine, the number of the airtight cavity and its vary is related to the gear ratio, the power frequency of the Engine is increased obviously.

  • Study on the power transmission mechanism of a twin-rotor Piston Engine based on cyloid
    2011 International Conference on Consumer Electronics Communications and Networks (CECNet), 2011
    Co-Authors: Hao Deng, Hu Cheng
    Abstract:

    In order to increase the power density of the Piston Engine, the power transmission mechanism of a twin-rotor Piston Engine based on cycloid is introduced. The twin-rotor Piston Engine has a number of advantages compare to other Piston Engine type. The combination method of its unique power transmission mechanism which use the cycloid and the crank-rocker mechanism creating a cyclic rotary motion superposed on uniform rotary motion of the rotor is proposed. Two types of this mechanism designed by the method are derived. This has been examined through the kinematic analysis. The results show that this Engine mechanism is compact and has the multiple power strokes per revolution of the flywheel.

Chenheng Yuan - One of the best experts on this subject based on the ideXlab platform.

  • friction characteristics of Piston rings in a free Piston Engine generator
    International Journal of Engine Research, 2017
    Co-Authors: Chenheng Yuan, Huihua Feng
    Abstract:

    Free-Piston Engine generator is a new alternative to traditional reciprocating Engine, which moves without mechanical restriction of crankshaft system. This article investigated numerically the fri...

  • Parametric study on the starting of a free-Piston Engine alternator:
    International Journal of Engine Research, 2017
    Co-Authors: Chenheng Yuan
    Abstract:

    The free-Piston Engine alternator is a new crankless Engine. The traditional starting method cannot be used to conveniently initialize the new Engine. This article introduced a resonance starting m...

  • Friction characteristics of Piston rings in a free-Piston Engine generator
    International Journal of Engine Research, 2016
    Co-Authors: Chenheng Yuan, Huihua Feng
    Abstract:

    Free-Piston Engine generator is a new alternative to traditional reciprocating Engine, which moves without mechanical restriction of crankshaft system. This article investigated numerically the friction characteristics of Piston rings in a free-Piston diesel Engine generator by adopting coupled models of dynamic and friction. The development of the dynamic model and friction model was described, and an iterative calculation method was presented, giving insight into the coupled parameters of these two models. The detailed effects of the dynamic on friction and lubrication were investigated compared with a corresponding traditional crank Engine. The friction characteristics of the free-Piston Engine generator were found to differ clearly from those of the traditional Engine due to its special Piston motion. Compared with the traditional Engine, the minimum lubricant film thickness of Piston rings in the free-Piston Engine generator is thicker and lasts shorter at the dead center regions, but it is generally...

  • combustion characteristics analysis of a free Piston Engine generator coupling with dynamic and scavenging
    Energy, 2016
    Co-Authors: Chenheng Yuan, Huihua Feng
    Abstract:

    Abstract Free-Piston Engine generator is an unconventional Engine, which abandons the crank and connecting rod mechanism. This paper focused on a numerical simulation for the research on the combustion characteristics of a free-Piston diesel Engine generator. An iteration numerical simulation method was presented by adopting coupled models of zero-dimensional dynamics, multidimensional scavenging and combustion. According to the coupled parameters of these models, the effects of the Piston motion on combustion process were investigated compared with a corresponding traditional crank Engine. The results indicate that compared with the conventional Engine, the free-Piston Engine generator has a longer combustion duration due to its faster Piston mean velocity in combustion process. While the heat release before top dead center, the isochoric heat release, and the heat release during the premixed combustion period both were lower than the traditional Engine, and the post-combustion became more intense for the free-Piston Engine, thus a slight disadvantage of indicated efficiency was found. In addition, the in-cylinder average gas temperature and pressure were generally lower than the traditional Engine, which contribute to the distinct advantages in NO discharge of the free-Piston Engine generator.

  • performance characteristics analysis of a hydrogen fueled free Piston Engine generator
    International Journal of Hydrogen Energy, 2016
    Co-Authors: Chenheng Yuan
    Abstract:

    Abstract The purpose of this paper is to introduce and investigate a new application of hydrogen to a special internal combustion Engine (free-Piston Engine generator). The development of a full-cycle zero-dimensional dynamic simulation model is described, and an extensive coupled research method is presented by the iteration simulation between the zero-dimensional dynamic model and a multi-dimensional computational fluid dynamics Engine model of combustion process, giving insight into the operating characteristics and performances of the new hydrogen fueled Engine. The influences of the Piston motion on combustion process are analyzed. The performance characteristics of the new hydrogen Engine are found to differ significantly from those of a corresponding traditional hydrogen Engine and a free-Piston gasoline Engine. The results indicate that compared with the above-mentioned traditional hydrogen Engine, the free-Piston hydrogen Engine has a higher Piston acceleration around top dead center (TDC) and a advantage in terms of emissions formation due to faster power stroke expansion, but the indicated efficiency is slightly lower due to the longer late combustion process. Moreover, the indicated efficiency, combustion velocity and peak pressure are both larger, compared with the free-Piston Engine combusting gasoline, and the concentration of NO emission also has an advantage.