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Prediction of Hydraulic Cavitation using 1D simulation technique

John Deere India Pvt. Ltd.-Vinit Jawale, Ameya Bandekar
VJTI-Pritam Shinde, Addanki Rao
  • Technical Paper
  • 2019-28-0129
To be published on 2019-10-11 by SAE International in United States
Hydraulic Cavitation is, in many cases, an undesirable occurrence. It is the formation and collapse of air cavities in liquid. In hydraulic devices such as pumps, motors, etc. cavitation causes a great deal of noise, local erosion, damage to components, vibrations, increases oil contamination and a loss of efficiency. There is already established process of predicting cavitation using 3D simulation software. However, the model development is the time-consuming process as well as prediction process is component /subsystem level and cannot be done for various duty cycle operations at architecture level. That requires exploring our research in 1D simulation technique for prediction of cavitation. In this research, we have developed and implemented a methodology/mathematical model for the prediction of hydraulic cavitation in hydraulic system using a 1D simulation technique. For simulation purpose, we have taken an example of simple hydraulic system and predicted the cavitation in one of the component/subsystem of hydraulic system for ambient conditions. The mathematical model proposed based on mass transport equations of vapor, liquid and gas, Rayleigh-Plesset equations, Singhal model and bubble…
 

Design of light weight Hydraulic Connecting Rod for Agricultural Tractor

Mahindra & Mahindra, Ltd.-Mahendra Dumpa, Solairaj Perumal, Dinesh Redkar, Maxson Gomes, Prasanna Balaji Subbaiyan
  • Technical Paper
  • 2019-28-0016
To be published on 2019-10-11 by SAE International in United States
Hydraulic power train assembly of an agricultural tractor is meant to controls the position and draft of the implement depending upon the type of crop, farming stage, implement type and soil conditions. These variations induce extreme range of loads on the hydraulic system, thus making it challenging to design these components. Hydraulic connecting rod is critical component of hydraulic power train assembly. Standards like IS12224, IS4468 governs the design of hydraulic power train components which regulates the test method for hydraulic power and lift capacity of the tractor. In this paper, a virtual simulation process has been established to design a hydraulic connecting rod to meet the requirements. The hydraulic connecting rod basically functions as a short column, which is subjected to the operating hydraulic pressure of the hydraulic lifting mechanism. The current circular connecting rod is higher in weight and cost. So, there is scope for optimizing the design of connecting rod. Virtual simulation has been done by performing (i) Multi body dynamics analysis (MBD) approach is used to predict the loads on Tractor…
 
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Rubber: Butyl (IIR Abbreviation), Phosphate Ester Resistant, 65 to 75 Hardness, for Seals in Hydraulic Systems, etc.

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS7338A
  • Current
Published 2019-07-18 by SAE International in United States

This specification covers a butyl rubber in the form of molded rings, compression seals, o-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. As AMS3238 is no longer valid for O-rings. For O-rings, the requirements of AMS7338 shall be met wherever AMS3238 is specified.

 

Clamp Selection and Installation Guide

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • ARP1897A
  • Current
Published 2019-05-20 by SAE International in United States
This document is prepared as an aid in the selection of clamping devices and their use in aerospace equipment for the installation and support of tubing and wiring. For recommended installation practices, refer to ARP994.
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Recommended Practice Regarding Commercial Aircraft Hydraulic System External Leakage

A-6A1 Commercial Aircraft Committee
  • Aerospace Standard
  • ARP6175
  • Current
Published 2019-04-29 by SAE International in United States
This Aerospace Recommended Practice (ARP) provides a comprehensive and consistent set of guidelines for the definition, recognition, troubleshooting and repair of hydraulic components and systems on in-service commercial aircraft affected by external leakage.
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Flexure Testing of Hydraulic Tubing Joints and Fittings

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • ARP1185C
  • Current
Published 2019-04-23 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) establishes flexure test procedures to determine and classify the fatigue strengths of reconnectable or permanent hydraulic tube joints. The procedure is intended for conducting flexure tests of fittings and joints for hydraulic tubing materials such as AMS 5561 (21Cr-6Ni-9Mn) steel or AMS 4944 (3AL-2.5V) titanium. A mean stress is applied by holding system pressure in the specimens and flexing in a rotary or planar bending test machine.
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HOSE ASSEMBLY, POLYTETRAFLUORETHYLENE, PARA ARAMID REINFORCED, 275 °F, 4000 MAX PSI, FLARELESS, TITANIUM FITTINGS, STRAIGHT TO STRAIGHT

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6013B
  • Current
Published 2019-04-17 by SAE International in United States
No Abstract Available.
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HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, PARA ARAMID REINFORCED, 275 °F, 4000 PSI MAX, FLARELESS, TITANIUM FITTINGS, STRAIGHT TO 90 DEGREES

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6015B
  • Current
Published 2019-04-17 by SAE International in United States
No Abstract Available.
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HOSE ASSEMBLY, POLYTETRAFLUOROTHYLENE, PARA ARAMID REINFORCED, 275 °F, 4000 PSI MAX, FLARELESS, TITANIUM FITTINGS, STRAIGHT TO 45 DEGREE

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6014B
  • Current
Published 2019-04-17 by SAE International in United States
No Abstract Available.
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Material Handler Nomenclature and Specifications

MTC C5, Excavators
  • Ground Vehicle Standard
  • J2506_201904
  • Current
Published 2019-04-15 by SAE International in United States
This SAE Standard establishes terminology and the content of commercial literature specifications for self-propelled crawler and wheeled material handlers, pedestal mounted material handlers and their equipment as defined in 3.1. Illustrations used here are not intended to include all existing commercial machines or to be exactly descriptive of any particular machine. They have been provided to describe the principles to be used in applying this document. (Material handlers share many design characteristics with hydraulic excavators and log loaders; primarily 360 degree continuous rotation of the upperstructure relative to the undercarriage or mounting. They differ in their operating application. Material handlers are used for the handling of scrap material and normally utilize grapples or magnets. Hydraulic excavators are used for the excavation of earth, gravel and other loose material utilizing a bucket. Log loaders are used for the handling of logs and trees and normally utilize grapples.)
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