Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent...
Transcript of Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent...
![Page 1: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/1.jpg)
2018 CCEFP
Georgia Institute of Technology | Marquette University | Milwaukee School of Engineering | North Carolina A&T State University | Purdue University | University of California, Merced | University of Illinois, Urbana-Champaign | University of
Minnesota | Vanderbilt University
Project 16ST1:
AC Hydraulic Pump/Motor
Mengtang Li, Graduate Student, Vanderbilt University
Ryan Foss, Graduate Student, University of Minnesota
Prof. Kim Stelson
Prof. James Van de Ven
Prof. Eric Barth
photo
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22018 CCEFP
Common Fixed
Displacement Pump:
• Gear Pump
• Vane Pump
• Bent Axis Pump
• Axial Piston Pump
• Radial Piston Pump
Common Variable
Displacement Pump:
• Swash-Plate Axial Piston Pump
• Bent Axis Pump
Goal:
• Variable Displacement
• Compactness
• Simple Structure
• High Efficiency
Hydraulic Pump
![Page 3: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/3.jpg)
32018 CCEFP
AFH Variable Displacement Pump
Piston 1
Piston 2
(phase
adjusting)
Combined
Waveform
Piston
Stroke
![Page 4: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/4.jpg)
42018 CCEFP
Phase Shift = 𝟎°, Fractional Displacement = 1
Basic Idea of AFH VDP
![Page 5: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/5.jpg)
52018 CCEFP
Phase Shift = 𝟏𝟖𝟎°, Fractional Displacement = 0
Basic Idea of AFH VDP
![Page 6: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/6.jpg)
62018 CCEFP
Phase Shift = 𝟗𝟎°, Fractional Displacement = 70.83%
Basic Idea of AFH VDP
![Page 7: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/7.jpg)
72018 CCEFP
AFH VDP Prototype 1
3CP1120
![Page 8: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/8.jpg)
82018 CCEFP
AFH VDP Prototype 1
Sprocket-chain
CAT 3CP1120
Pipes connecting
cylinder chambers
Torque Sens.
Input, Output,
and Cylinder
Pressure Sens.
Output Flow Sens.
![Page 9: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/9.jpg)
92018 CCEFP
AFH VDP Model
• The model captures piston kinematics and cylinder pressure as
functions of the pump’s phase shift angle.
![Page 10: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/10.jpg)
102018 CCEFP
AFH VDP Model
• The model captures flows between pairs of
cylinders as functions of the pump’s phase shift
angle
𝑄𝑐𝑜𝑛
𝑃𝑐𝑦𝑙,1 𝑃𝑐𝑦𝑙,2𝑅, 𝐼
𝑃𝑐𝑦𝑙,1 = 𝑃𝑐𝑦𝑙,2 + ∆𝑃𝑅 + ∆𝑃𝐼
⟹ 𝑄𝑐𝑜𝑛 =1
𝐼(𝑃𝑐𝑦𝑙,1 −𝑃𝑐𝑦𝑙,2 − ∆𝑃𝐼)
![Page 11: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/11.jpg)
112018 CCEFP
AFH VDP Model
• The model also captures check valve dynamics†
† Knutson, A. L., Van de Ven, J. D. (2016). Modelling and experimental validation of the displacement
of a check valve in a hydraulic piston pump. International Journal of Fluid Power, 17(2), 114-124.
![Page 12: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/12.jpg)
122018 CCEFP
AFH VDP Model
• The model also captures input motor torque
![Page 13: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/13.jpg)
132018 CCEFP
AFH VDP Model
• The model also considers
(1). Leakage
(2). Viscous friction
(3). Effective bulk modulus
![Page 14: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/14.jpg)
142018 CCEFP
AFH VDP Model
A Dynamic Model using first principles captures
• Piston kinematics and dynamics
• Cylinder pressure
• Flows between pairs of cylinders
• Net inlet and outlet flows
as functions of the pump’s phase shift angle.
The model also captures
• Hydraulic check valve dynamics
• The effective bulk modulus
• Leakage flows
• Viscous friction
• Input motor torque
Input: Downstream Pressure, Motor Speed, Phase Shift Angle
Output: Cylinder Pressure, Flowrates*, Energy*.
![Page 15: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/15.jpg)
152018 CCEFP
AFH VDP Model Validation
(a) 𝜙 = 2𝑜, 250 rpm
(c) 𝜙 = 165𝑜, 250 rpm (d) 𝜙 = 165𝑜, 250 rpm
(b) 𝜙 = 2𝑜, 250 rpm
![Page 16: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/16.jpg)
162018 CCEFP
AFH VDP Model Validation
𝜙 = 2𝑜
250rpm
1000psi
𝜙 = 165𝑜
250rpm
1000psi
![Page 17: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/17.jpg)
172018 CCEFP
AFH VDP Model Validation
Results start to deviate from model
due to large dead volume.
Large dead volume, viscous
losses and friction in chain and
seals.
![Page 18: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/18.jpg)
182018 CCEFP
Phase Shift 1 – Differential Gear
• One wide hollow shaft (to
drive one cam) and one
narrow long shaft (to drive the
other cam).
• The differential gear set can be
placed at one side of a radial
piston pump, thus reducing the
distance between two parallel
pumping units and shortening
the connecting pipe size.
• The whole size of this phase
shift mechanism can be small.
For illustration purpose, it is
larger here.
narrow long wide hollow
![Page 19: Project 16ST1: AC Hydraulic Pump/MotorDisplacement Pump: • Swash-Plate Axial Piston Pump • Bent Axis Pump Goal: • Variable Displacement • Compactness • Simple Structure •](https://reader035.fdocuments.net/reader035/viewer/2022071414/610d3b6ff2ff7f4ac90a2ca7/html5/thumbnails/19.jpg)
192018 CCEFP
Phase Shift 2 – Pin in Slot
Cam 1 Cam 2
* Credits go to Caroline for her great work.
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202018 CCEFP
Phase Shift 3 – Toyota Phaser
Out of PhaseIn Phase
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212018 CCEFP
Mengtang Li
Ryan Foss
Thank You!
Question?