Monopropellant-Driven Free Piston Hydraulic Pump for Mobile Robotic Systems

2004 ◽  
Vol 126 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Timothy G. McGee ◽  
Justin W. Raade ◽  
H. Kazerooni
Keyword(s):  
Hydrogen Peroxide ◽  
High Temperature ◽  
Thermodynamic Analysis ◽  
Flow Rate ◽  
Power Supply ◽  
Robotic Systems ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Free Piston

The authors present a novel power supply for mobile robotic systems. A monopropellant (e.g., hydrogen peroxide) decomposes into high temperature gases, which drive a free piston hydraulic pump (FPHP). The elimination of fuel/oxidizer mixing allows the design of simple, lightweight systems capable of operation in oxygen free environments. A thermodynamic analysis has been performed, and an experimental FPHP has been built and tested. The prototype successfully pumped hydraulic fluid, although the flow rate was limited by the off-the-shelf components used.

Theoretical Analysis and Experimental Verification of a Monopropellant Driven Free Piston Hydraulic Pump

2003 ◽  
Author(s):  
Timothy G. McGee ◽  
Justin W. Raade ◽  
H. Kazerooni
Keyword(s):  
Hydrogen Peroxide ◽  
High Temperature ◽  
Theoretical Analysis ◽  
Flow Rate ◽  
Experimental Verification ◽  
Power Supply ◽  
Robotic Systems ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Free Piston

The authors present a novel power supply for mobile robotic systems. A monopropellant (e.g. hydrogen peroxide) decomposes into high temperature gases, which drive a free piston hydraulic pump (FPHP). The elimination of fuel/oxidizer mixing allows the design of simple, lightweight systems capable of operation in oxygen free environments. A thermodynamic analysis has been performed, and an experimental FPHP has been built and tested. The prototype successfully pumped hydraulic fluid, although the flow rate was limited by the off-the-shelf components used.

Design, Construction, and Experimental Evaluation of a Monopropellant Powered Free Piston Hydraulic Pump

2003 ◽  
Author(s):  
Justin W. Raade ◽  
Timothy G. McGee ◽  
H. Kazerooni
Keyword(s):  
Hydrogen Peroxide ◽  
Mobile Robotics ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
High Concentration ◽  
Free Piston ◽  
Hot Gas ◽  
Piston Cylinder ◽  
Human Scale ◽  
Design Construction

A monopropellant powered free piston hydraulic pump (FPHP) was designed as a human scale (1.0 to 3.0 kW) mobile robotics power supply. The FPHP utilized high concentration hydrogen peroxide, which decomposes into hot gas when exposed to a catalyst, as the monopropellant energy source. Energy was extracted from the hydrogen peroxide and transferred directly to hydraulic fluid by expanding the hot decomposition gas in an integrated piston/cylinder arrangement. The prototype FPHP successfully produced 50 W of hydraulic power by pumping hydraulic fluid at an average pressure of 6.5 MPa (940 psi) and flow rate of 0.48 liters/min (0.13 gallons/min).

Switchmode Hydraulic Power Supply Theory

2005 ◽  
Author(s):  
Jianwei Cao ◽  
Linyi Gu ◽  
Feng Wang ◽  
Minxiu Qiu
Keyword(s):  
Flow Rate ◽  
Dynamic Characteristics ◽  
Power Supply ◽  
Power Loss ◽  
High Speed ◽  
Hydraulic Pressure ◽  
Hydraulic Systems ◽  
Hydraulic Pump ◽  
Hydraulic Power ◽  
Supply Pressure

Switchmode hydraulic power supply is a new kind of energy-saving pressure converting system, which is originally proposed by the authors. It is mainly applied in multiple-actuator hydraulic systems, and installed between hydraulic pump and actuators (one switchmode hydraulic power supply for one actuator). It can provide pressure or flow rate that is adapted to the consumption of each actuator in the system by boosting or bucking the pressure, with low power loss, and conveniently, through high-speed switch valves, just like a hydraulic pressure transformer. There are two basic types of switchmode hydraulic power supply: pressure boost and pressure buck. Their structures and working principles are introduced. The dynamic characteristics of two typical types of switchmode hydraulic power supply, the pressure boost type and the pressure buck type, were analyzed through simulations and experiments. The performances were evaluated, and improvements on the efficiency of switchmode hydraulic power supply were proposed.

Thermodynamic Analysis of Hydraulic Braking Energy Recovery Systems for a Vehicle

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyam Panchal ◽  
Ibrahim Dincer ◽  
Martin Agelin-Chaab
Keyword(s):  
Thermodynamic Analysis ◽  
Energy Recovery ◽  
Hydraulic Fluid ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Energy Recovery System ◽  
Environment Temperature ◽  
Recovery System ◽  
Hydraulic Accumulator ◽  
Braking Energy Recovery

In this study, a thermodynamic analysis of a hydraulic braking energy recovery system used in vehicles is performed for newly developed systems. The present system is related to the field of energy efficiency in vehicles. The energy recovery system comprises a first pump, a hydraulic accumulator, and a hydraulic motor. The first pump is a variable displacement hydraulic pump (VDP). The hydraulic accumulator is connected to the first pump which operates to store hydraulic fluid under pressure. The hydraulic motor is hydraulically connected to the accumulator to receive hydraulic fluid. The motor is adapted to drive a second hydraulic pump, which is hydraulically connected to the auxiliary system, using hydraulic energy stored in the accumulator. The overall charging and discharging efficiencies, and the overall system efficiency is calculated and presented in this paper. For the purpose of the analysis, EES (engineering equation solver) is used. In addition, parametric studies are performed to observe the effects of different substantial parameters, namely, the inlet pressure and temperature of the accumulator, and the reference environment temperature, in order to investigate the variations in the system performance in terms of the efficiencies. Two systems are developed and it is found that the charging and discharging efficiencies for one system are 83.81% and 87.73%, while for the other system the charging and discharging efficiencies are 81.84% and 85.67%, respectively.

Thermodynamic Analysis of Friction Pairs inside a High Temperature Flow Rate Control Valve for Scramjet Engines

2008 ◽  
Vol 575-578 ◽  
pp. 1240-1245 ◽  
Author(s):  
Song Jing Li ◽  
Zeng Wei Zang ◽  
Yong Hong Li ◽  
Wen Bao
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Field Distribution ◽  
Thermodynamic Analysis ◽  
Flow Rate ◽  
Dynamic Models ◽  
Fluid Dynamic ◽  
Control Valve ◽  
Element Analysis ◽  
Scramjet Engines

A spool type high temperature control valve is developed to control the flow rate of high temperature fuel supply for scramjet engines in this paper. The clearance between the friction pairs of the spool and sleeve is crucial for the proper performance of the valve working at the temperature as high as 700 K. The high temperature environment may cause problems to the valve, for instance the thermal deformation of the valve materials, the failure of the friction pairs inside the valve and even the damage of the operating proportional electromagnet. Therefore the thermodynamic analyses of the valve are carried out using 2D finite element analysis method. The heat transfer and fluid dynamic models, as well as the boundary conditions are introduced. The heat flux through the fluid/solid interface is calculated to connect the heat transfer models inside the solid domain and the fluid domain. By solving both the heat transfer and turbulent flow models in the solid and fluid domains, the flow field distribution inside the flow channel and the thermal field distribution inside all the parts of the valve are shown. Suggestions on the design of the valve are given according to the thermodynamic analysis results.

The Performance Simulation of One-Way Inlet Valve of Reflux Scavenging Free Piston Engine

2013 ◽  
Vol 694-697 ◽  
pp. 582-587
Author(s):  
Zhen Xin Li ◽  
Zhao Cheng Yuan ◽  
Jia Yi Ma ◽  
Shi Yu Li
Keyword(s):  
Flow Rate ◽  
Spring Constant ◽  
Air Flow Rate ◽  
Inlet Valve ◽  
Free Piston ◽  
Performance Simulation ◽  
Bottom Dead Center ◽  
Free Piston Engine ◽  
Opening And Closing ◽  
Stroke Engine

The performance of one-way inlet valve directly impacts the effect of the reflux scavenging two-stroke engine intake. It’s discovered that the intake air flow rate, the weight of valve and the spring constant have the greatest impact on the opening, closing and the lift change of one-way inlet valve, by simulating the movement of piston and valve using CFD software. The greater the flow rate, the smaller the weight of valve, or the smaller the spring constant, then the faster the opening of valve. Meanwhile, in order to ensure that the valve quickly returns, the bigger of spring constant is the better. The phases of opening and closing of valve lag fall behind the phases of piston getting to bottom dead center (BDC) and top dead center (TDC).

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