The Experts below are selected from a list of 60 Experts worldwide ranked by ideXlab platform
Zhenwei Liu - One of the best experts on this subject based on the ideXlab platform.
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A study of a speed amplified linear generator for low-frequency wave energy conversion
Mechanical Systems and Signal Processing, 2021Co-Authors: Zhenwei Liu, Xu Wang, Elie Al Shami, Nick J. BakerAbstract:Abstract This paper proposes a new method of speed amplification for a direct drive ocean wave energy converter. The relative speed of the stator and translator of a linear generator is doubled through a fixed Pulley Wheel mechanism. Analytical and simulation models of the system have been developed and simulated considering the mechanical damping and electrical damping coefficients. The models have been simulated in both the regular waves and irregular waves where hydrodynamic parameters for different heaving buoys are calculated from hydrodynamic boundary element analysis simulation using the ANSYS AQWA software. The relative displacement, output voltage and harvested power of the speed amplified wave energy converter system have been obtained in the frequency and time domains. The frequency and time domain models were validated through comparing the peak output power values at different frequencies. The generator parameters of electromagnetic coupling coefficient, or the power take-off (PTO) electrical damping coefficient and external resistance were studied to ensure an optimal wave-energy converter (WEC) design.
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A new concept of speed amplified nonlinear electromagnetic vibration energy harvester through fixed Pulley Wheel mechanisms and magnetic springs
Mechanical Systems and Signal Processing, 2019Co-Authors: Zhenwei Liu, Xu Wang, Songlin Ding, Ran Zhang, Luke McnabbAbstract:Abstract This paper proposes a novel design of speed amplified nonlinear electromagnetic vibration energy harvester through fixed Pulley Wheel mechanisms and magnetic springs. The new vibration energy harvester consisting of fixed Pulley Wheel mechanisms, nonlinear magnetic springs, inner and outer rectangular ring Halbach arrays of magnets and a four-phase coil connection has potential to generate more output voltage than that with the speed amplified linear electromagnetic vibration energy harvester and conventional non-speed amplified nonlinear electromagnetic vibration energy harvester. By so far no one has worked on increasing the relative speed of the magnets with respect to the coils by adopting the fixed Pulley Wheel mechanisms. The nonlinear vibration was achieved by adopting repulsive magnetic springs with nonlinear spring stiffness. Analytical and simulation solutions of the speed amplified nonlinear electromagnetic vibration energy harvester system considering the effects of the rotational inertia of the Pulley Wheels have been verified by experimental results. The dimensionless formulae of the relative displacement, output voltage and harvested power of the speed amplified nonlinear electromagnetic vibration energy harvester system have been established and experimentally validated.
Xu Wang - One of the best experts on this subject based on the ideXlab platform.
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A study of a speed amplified linear generator for low-frequency wave energy conversion
Mechanical Systems and Signal Processing, 2021Co-Authors: Zhenwei Liu, Xu Wang, Elie Al Shami, Nick J. BakerAbstract:Abstract This paper proposes a new method of speed amplification for a direct drive ocean wave energy converter. The relative speed of the stator and translator of a linear generator is doubled through a fixed Pulley Wheel mechanism. Analytical and simulation models of the system have been developed and simulated considering the mechanical damping and electrical damping coefficients. The models have been simulated in both the regular waves and irregular waves where hydrodynamic parameters for different heaving buoys are calculated from hydrodynamic boundary element analysis simulation using the ANSYS AQWA software. The relative displacement, output voltage and harvested power of the speed amplified wave energy converter system have been obtained in the frequency and time domains. The frequency and time domain models were validated through comparing the peak output power values at different frequencies. The generator parameters of electromagnetic coupling coefficient, or the power take-off (PTO) electrical damping coefficient and external resistance were studied to ensure an optimal wave-energy converter (WEC) design.
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A new concept of speed amplified nonlinear electromagnetic vibration energy harvester through fixed Pulley Wheel mechanisms and magnetic springs
Mechanical Systems and Signal Processing, 2019Co-Authors: Zhenwei Liu, Xu Wang, Songlin Ding, Ran Zhang, Luke McnabbAbstract:Abstract This paper proposes a novel design of speed amplified nonlinear electromagnetic vibration energy harvester through fixed Pulley Wheel mechanisms and magnetic springs. The new vibration energy harvester consisting of fixed Pulley Wheel mechanisms, nonlinear magnetic springs, inner and outer rectangular ring Halbach arrays of magnets and a four-phase coil connection has potential to generate more output voltage than that with the speed amplified linear electromagnetic vibration energy harvester and conventional non-speed amplified nonlinear electromagnetic vibration energy harvester. By so far no one has worked on increasing the relative speed of the magnets with respect to the coils by adopting the fixed Pulley Wheel mechanisms. The nonlinear vibration was achieved by adopting repulsive magnetic springs with nonlinear spring stiffness. Analytical and simulation solutions of the speed amplified nonlinear electromagnetic vibration energy harvester system considering the effects of the rotational inertia of the Pulley Wheels have been verified by experimental results. The dimensionless formulae of the relative displacement, output voltage and harvested power of the speed amplified nonlinear electromagnetic vibration energy harvester system have been established and experimentally validated.
Nick J. Baker - One of the best experts on this subject based on the ideXlab platform.
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A study of a speed amplified linear generator for low-frequency wave energy conversion
Mechanical Systems and Signal Processing, 2021Co-Authors: Zhenwei Liu, Xu Wang, Elie Al Shami, Nick J. BakerAbstract:Abstract This paper proposes a new method of speed amplification for a direct drive ocean wave energy converter. The relative speed of the stator and translator of a linear generator is doubled through a fixed Pulley Wheel mechanism. Analytical and simulation models of the system have been developed and simulated considering the mechanical damping and electrical damping coefficients. The models have been simulated in both the regular waves and irregular waves where hydrodynamic parameters for different heaving buoys are calculated from hydrodynamic boundary element analysis simulation using the ANSYS AQWA software. The relative displacement, output voltage and harvested power of the speed amplified wave energy converter system have been obtained in the frequency and time domains. The frequency and time domain models were validated through comparing the peak output power values at different frequencies. The generator parameters of electromagnetic coupling coefficient, or the power take-off (PTO) electrical damping coefficient and external resistance were studied to ensure an optimal wave-energy converter (WEC) design.
Luke Mcnabb - One of the best experts on this subject based on the ideXlab platform.
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A new concept of speed amplified nonlinear electromagnetic vibration energy harvester through fixed Pulley Wheel mechanisms and magnetic springs
Mechanical Systems and Signal Processing, 2019Co-Authors: Zhenwei Liu, Xu Wang, Songlin Ding, Ran Zhang, Luke McnabbAbstract:Abstract This paper proposes a novel design of speed amplified nonlinear electromagnetic vibration energy harvester through fixed Pulley Wheel mechanisms and magnetic springs. The new vibration energy harvester consisting of fixed Pulley Wheel mechanisms, nonlinear magnetic springs, inner and outer rectangular ring Halbach arrays of magnets and a four-phase coil connection has potential to generate more output voltage than that with the speed amplified linear electromagnetic vibration energy harvester and conventional non-speed amplified nonlinear electromagnetic vibration energy harvester. By so far no one has worked on increasing the relative speed of the magnets with respect to the coils by adopting the fixed Pulley Wheel mechanisms. The nonlinear vibration was achieved by adopting repulsive magnetic springs with nonlinear spring stiffness. Analytical and simulation solutions of the speed amplified nonlinear electromagnetic vibration energy harvester system considering the effects of the rotational inertia of the Pulley Wheels have been verified by experimental results. The dimensionless formulae of the relative displacement, output voltage and harvested power of the speed amplified nonlinear electromagnetic vibration energy harvester system have been established and experimentally validated.
Ovik, Espen Noreng - One of the best experts on this subject based on the ideXlab platform.
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Mechanical landmine clearing tool for NMBU`s agricultural robot
Norwegian University of Life Sciences Ås, 2016Co-Authors: Ovik, Espen NorengAbstract:This thesis contain the process of creating a modular and mechanical landmine clearing tool for NMBU`s agricultural robot, Thorvald 2. In this thesis, there will be information about the problem with landmines today and how a landmine work, along with the development process for the product, including concept evaluation, calculations and simulations. The basic idea of the concept is that a load is to be dropped at the landmines location. The load will create a ground pressure that will trigger any pressure sensitive landmines. The load is a 25 kg heavy bag of sand and it will be dropped from a height of 1 meter. A winch lifts the load up and keeps it in the air. A clutch disconnects the drum from the rest of the winch system and the load drops to the ground. A scaffold is placed on the robot, with a Pulley Wheel at the top. The scaffold and the Pulley Wheel are designed and placed so that the Pulley Wheel is directly above the landmines, which are located in the middle and at the rear of the robot. A steel wire connects the load and the winch via the Pulley Wheel. The clutch is custom designed from scratch to fit the winch system. A linear actuator connects and disconnects the clutch. The winch is driven by a brushless direct current motor, along with a gearbox. Simulations done by FFI gives reason for optimism for the continuation of the project. A prototype is yet to be completed
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Mechanical landmine clearing tool for NMBU`s agricultural robot
Norwegian University of Life Sciences Ås, 2016Co-Authors: Ovik, Espen NorengAbstract:This thesis contain the process of creating a modular and mechanical landmine clearing tool for NMBU`s agricultural robot, Thorvald 2. In this thesis, there will be information about the problem with landmines today and how a landmine work, along with the development process for the product, including concept evaluation, calculations and simulations. The basic idea of the concept is that a load is to be dropped at the landmines location. The load will create a ground pressure that will trigger any pressure sensitive landmines. The load is a 25 kg heavy bag of sand and it will be dropped from a height of 1 meter. A winch lifts the load up and keeps it in the air. A clutch disconnects the drum from the rest of the winch system and the load drops to the ground. A scaffold is placed on the robot, with a Pulley Wheel at the top. The scaffold and the Pulley Wheel are designed and placed so that the Pulley Wheel is directly above the landmines, which are located in the middle and at the rear of the robot. A steel wire connects the load and the winch via the Pulley Wheel. The clutch is custom designed from scratch to fit the winch system. A linear actuator connects and disconnects the clutch. The winch is driven by a brushless direct current motor, along with a gearbox. Simulations done by FFI gives reason for optimism for the continuation of the project. A prototype is yet to be completed.Denne oppgaven omhandler fremstillingen av et modulært og mekanisk mineryddings verktøy for NMBU sin landbruksrobot, Thorvald 2. Oppgaven består av bakgrunnsinformasjon om problemet med landminer i verden i dag og hvordan landminer opererer, samt hele utviklingsfasen til produktet, inklusivt konsept drøfting, beregninger og simuleringer. Konseptet innebærer at en last slippes ned på bakken der en landmine befinner seg. Lasten skaper en bakketrykk som vil detonere landminene. Lasten er en sekk med sand på 25 kilogram som slippes fra 1 meters høyde. En vinsj løfter lasten opp fra bakken og holder den oppe. En clutch frigjør trommelen fra resten av vinsjen slik at sandsekken faller ned på bakken. Et stilas monteres på roboten med en trinse på toppen. Stillaset og trinsen er konstruert og plassert slik at trinsen er direkte over landminen, som er plassert i midten og bak roboten. Et ståltau forbinder lasten og vinsjen via trinsen. Clutchen er konstruert fra bunnen av og tilpasset systemet. Den bruker en lineær aktuator for av og på kobling. Vinsjen drives av en børsteløs likestrøms motor, sammen med et gir. Simuleringer gjort av FFI gir optimisme med tanke på videre testing. En prototype er ikke ferdigstilt.M-MP
