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Research Papers: Hydrodynamic Lubrication

Effects of Pressure Boundary on Dynamic Torque Behavior of Hydroviscous Drive

[+] Author and Article Information
Jianzhong Cui

Research Center of Mould Intelligent
Manufacturing Technology,
Yancheng Institute of Technology,
Yancheng 224051, China
e-mail: cuijianzhong21@163.com

Jun Liu

Research Center of Mould Intelligent
Manufacturing Technology,
Yancheng Institute of Technology,
Yancheng 224051, China
e-mail: liuj@ycit.cn

Fangwei Xie

School of Mechanical Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: xiefangwei@ujs.edu.cn

Cuntang Wang

School of Mechanical Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: ctwang@ujs.edu.cn

Pengliang Hou

School of Mechanical Engineering,
Yancheng Institute of Technology,
Yancheng 224051, China
e-mail: chinahpl@126.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 19, 2017; final manuscript received May 13, 2018; published online June 13, 2018. Assoc. Editor: Alan Palazzolo.

J. Tribol 140(6), 061705 (Jun 13, 2018) (11 pages) Paper No: TRIB-17-1096; doi: 10.1115/1.4040376 History: Received March 19, 2017; Revised May 13, 2018

The object of this work is to investigate the effect of the change of film pressure resulting from axial squeeze-film motion between driving and driven disks on the performance of hydroviscous drive (HVD). A simplified mathematical model of the steady and laminar flow between parallel disks is established with consideration of three kinds of pressure boundary conditions. Some analytical solutions of film thickness, rotate speed of driven disk, viscous torque, and total torque are obtained. The numerical results show that the torque response depends on the relationship between the inlet pressure and the outlet pressure when considering the Dirichlet boundary conditions. The soft-start under Dirichlet boundary conditions and Mixed boundary conditions reflects the constant-torque startup and torque control startup, respectively. Compared with the two boundary conditions above, the soft-start under pressure profile boundary from Neumann boundary conditions has advantages for speed regulation. The effects of the ratio of inner and outer radius on the torque profiles and soft-start time are mainly related to Dirichlet boundary conditions and pressure profile boundary from Neumann boundary conditions.

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Figures

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Fig. 1

Schematic of the HVD

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Fig. 9

Effect of the ratio of inner and outer radius (a/b) on total torque and viscous torque (p1 = p2 = 0, b = 0.125 m)

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Fig. 8

Effect of pressure profile boundary from Neumann boundary condition on total torque and viscous torque (b = 0.125 m): (a) total torque and (b) viscous torque

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Fig. 7

Effect of pressure profile boundary from Neumann boundary condition on total torque and viscous torque: (a) total torque and (b) viscous torque

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Fig. 6

Effect of Mixed boundary condition on total torque and viscous torque: (a) total torque and (b) viscous torque

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Fig. 5

Effect of Dirichlet boundary condition on total torque and viscous torque (p1 = p2): (a) total torque and (b) viscous torque

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Fig. 4

Effect of Dirichlet boundary condition on total torque and viscous torque (p1 = 0 < p2): (a) total torque and (b) viscous torque

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Fig. 3

Effect of Dirichlet boundary condition on total torque and viscous torque (p1 > p2 = 0): (a) total torque and (b) viscous torque

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Fig. 2

Flowchart of the soft-start model

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Fig. 10

Soft-start time comparison: Dirichlet B. C. versus pressure profile boundary from Neumann B. C.

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Fig. 11

Test bench (a) photograph of HVD system and (b) schematic diagram of test bench

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Fig. 12

Effect of incremental inlet oil pressure Δp = pt+1 − pt on total torque

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