Scaling Criteria for Axial Piston Machines Based on Thermo-Elastohydrodynamic Effects in the Tribological Interfaces

Shang, Lizhi; Ivantysynova, Monika

doi:10.3390/en11113210

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…One limitation about the unit loss look-up table is the data may not be available for all the candidate units with different sizes considered in the study. A possible way to solve this problem is to use the linear scaling method to scale a known unit loss look-up table with respect to a certain unit size to a different unit size [31][32][33]. It introduced a linear scaling factor λ to scale the unit rotational speed, flowrate, and torque as shown in Equations ( 23)- (26).…”

Section: Hydraulic Pumps and Motorsmentioning

confidence: 99%

Advanced Design and Optimal Sizing of Hydrostatic Transmission Systems

Guo

Vacca

2021

Actuators

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This paper presents a novel method for designing and sizing high-efficient hydrostatic transmissions (HTs) for heavy duty propulsion applications such as agricultural and construction machinery. The proposed method consists in providing cost effective HT architectures that maximizes efficiency at the most frequent operating conditions of the transmission, as opposed to the traditional HT design methods based on the most demanding requirements of the system. The sizing method is based on a genetic optimization algorithm for calculating the optimal displacement of the main units of the HT to maximizes the efficiency in the most frequent operating conditions of the vehicle. A simulation model for HTs is built in MATLAB/Simulink® environment to test three different circuit alternatives for basic HTs. Considering a particular 250 kW heavy-duty application for which drive cycle data were available, this study shows great improvement in energy efficiency (14%) and power saving (20.1%) at frequent operating conditions while still achieving the corner power condition.

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Section: Hydraulic Pumps and Motorsmentioning

confidence: 99%

Advanced Design and Optimal Sizing of Hydrostatic Transmission Systems

Guo

Vacca

2021

Actuators

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“…Figure 14 shows the empirical loss model for a hydraulic unit for volumetric efficiency and torque efficiency. The loss model was generated based on a positive displacement axial piston hydraulic unit of 75 cc and it was applied for each hydraulic unit model by a scaling law [40]. Loss power was dissipated as heat and the temperatures of the fluid and the ports of hydraulic unit increase.…”

Section: Hydraulic System Modelingmentioning

confidence: 99%

System Characteristics Analysis for Energy Management of Power-Split Hydraulic Hybrids

Kwon

Ivantysynova

2020

Energies

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Hydraulic hybrid powertrains provide an opportunity for specific applications, such as heavy-duty vehicles based on high-power density, which has not been included in other types of hybrid powertrains. Among the various architectures of hybrid vehicles, power-split hybrids have a greater possibility of producing better fuel efficiency than other hybrid architectures. This study analyzed the possible energy-saving characteristics of power-split hydraulic hybrid vehicles (HHVs); this has not been comprehensively described in previous studies. A typical configuration of power-split HHVs was modeled with the FTP-72 driving cycle using a novel simulation method that considered the dynamic and thermal behaviors together. The characteristics were analyzed in comparison to a power-split hydrostatic transmission (HST), which is designed with the same conditions except for hydraulic energy storage. The power-split HHV not only has a better fuel efficiency, but it also shows system energy-saving characteristics. The power-split HHV has more chances for engine idling, which is directly related to fuel consumption savings due to engine stop. Additionally, more engine idling time enables the system to operate in a more efficient area on the engine map by load leveling. The results for the system temperature show that the power-split HHV offers the possibility to deliver better thermal management because it prevents the waste of braking power, which is especially crucial for hydraulic systems in comparison to other power systems such as electric or mechanical power systems. The ease of thermal management results in less energy consumption for cooling down the system temperature by minimizing the cooling system, as well as in a better thermal stability for the hydraulic system. The power-split HHV characteristics analyzed in this study can be used to design and organize the system control logic while developing power-split HHVs.

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“…As an essential actuator in hydraulics, an axial piston motor whose energy losses and wear phenomena get more obvious with the increase in load pressure and shaft speed is widely used in industry and mobile machines (Li et al, 2019). The piston-cylinder pair represents one of the most critical design elements of the axial piston motor to realize its function (Shang and Ivantysynova, 2018;Ye et al, 2019). Differently from other friction pairs in axial piston machines, the piston-cylinder pair cannot be designed based on the principle of static and dynamic pressure balance due to its inherent structural principle.…”

Section: Introductionmentioning

confidence: 99%

An investigation into the micro-geometric tapered-shape surface design of the piston bore of a piston–cylinder interface in an axial piston motor

Liu

Zeng

et al. 2023

Mech. Sci.

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Abstract. In pursuit of design solutions that reduce energy loss and improve wear resistance for the piston–cylinder interface in an axial piston motor, a fluid-structure interaction numerical model and a new test rig of the friction force of the piston–cylinder pair are developed to achieve the analysis and design of the micro-geometric tapered-shape surface of a piston bore. The piston bore with the tapered-shape surface axial distribution length ratio of 49.44 % of the overall length is found to be the relatively optimized one. Furthermore, how the shaft speed, load pressure, and swash plate angle influence the performance of the two-type interface is analyzed. Numerical analysis results show that, compared with the traditional cylindrical piston bore design, the piston–cylinder interface with the optimized tapered-shape piston bore in the axial piston motor can achieve a significant reduction in leakage flow and friction force, and the experimental results are consistent with the simulation results.

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Scaling Criteria for Axial Piston Machines Based on Thermo-Elastohydrodynamic Effects in the Tribological Interfaces

Cited by 9 publications

References 14 publications

Advanced Design and Optimal Sizing of Hydrostatic Transmission Systems

Advanced Design and Optimal Sizing of Hydrostatic Transmission Systems

System Characteristics Analysis for Energy Management of Power-Split Hydraulic Hybrids

An investigation into the micro-geometric tapered-shape surface design of the piston bore of a piston–cylinder interface in an axial piston motor

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