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Prediction of Hydraulic Cavitation Using 1D Simulation

John Deere India Pvt. Ltd.-Vinit Jawale, Ameya Bandekar
VJTI-Pritam Shinde, Addanki Rao
  • Technical Paper
  • 2019-28-0129
Published 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…
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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
Published 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 load transferring link, 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…
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Hydraulic Fluid Power Circuit Filtration - Application and Methods

CTTC C1, Hydraulic Systems
  • Ground Vehicle Standard
  • J931_201910
  • Current
Published 2019-10-02 by SAE International in United States

This SAE Information Report is primarily to familiarize the designer of hydraulic powered machinery with the necessity for oil filtration in the hydraulic power circuit, the degree of system cleanliness required, types of filtration and filters available, and their location and maintenance in the hydraulic circuit.

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Filter and Filter Element for Hydraulic System(s) Used on Manufacturing and Assembly Equipment

Motor Vehicle Council
  • Ground Vehicle Standard
  • J2066_201910
  • Current
Published 2019-10-02 by SAE International in United States

This SAE Standard establishes a common specification and ordering code for hydraulic filter assemblies and hydraulic filter elements, and establishes minimum performance criteria and test methods. This document establishes two filter diameter sizes, five basic micron ratings, and two basic collapse ratings. These classifications will satisfy most hydraulic filter applications, and thereby can minimize inventory requirements for hydraulic filter elements.

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Aerospace Fluid Power - FAA Regulatory History - Transport Airplane Hydraulic Systems

A-6A1 Commercial Aircraft Committee
  • Aerospace Standard
  • AIR5696A
  • Current
Published 2019-09-03 by SAE International in United States

This SAE Aerospace Information Report (AIR) contains regulatory and guidance information related to transport airplane hydraulic systems. It contains certain Civil Air Regulations (CAR) and Federal Aviation Regulations (formerly referred to as FARs) from Title 14 Code of Federal Regulations (CFR) in their current version as well as the historical versions. This gives the reader an ability to assemble certain CAR/CFR parts as they existed at any date in the past (referred to as a Regulatory Basis). A certain amount of preamble explanatory material is included, which led to the regulatory rule changes (Amendments to the CFR).

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Fiber-Based Artificial Muscles

  • Magazine Article
  • TBMG-35132
Published 2019-09-01 by Tech Briefs Media Group in United States

While different approaches have been used to create artificial muscles — including hydraulic systems, servomotors, shape-memory metals, and polymers that respond to stimuli — they all have limitations such as high weight or slow response times. A fiber-based system was developed that is extremely lightweight and can respond very quickly.

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Assessing Cleanliness of Hydraulic Fluid Power Components and Systems

CTTC C1, Hydraulic Systems
  • Ground Vehicle Standard
  • J1227_201908
  • Current
Published 2019-08-29 by SAE International in United States

To describe laboratory methods for determining and reporting the contaminant level of the wetted portion of hydraulic fluid power components, parts, subsystems and systems, and of fill fluids. For each type of item, it provides a method of obtaining the liquid sample and the contamination level thereof. It also includes procedures for establishing a sampling plan and guidelines for establishing levels of acceptance, but does not set those levels.

Hydraulic Thermal Bypass Valve

  • Magazine Article
  • TBMG-34875
Published 2019-08-01 by Tech Briefs Media Group in United States

ThermOmegaTech Warminster, PA 877-379-8258

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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.

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Specification for O-Ring Face Seal Connectors: Part 1 - Tube Connection Details and Common Requirements for Performance and Tests

Hydraulic Tube Fittings Committee
  • Ground Vehicle Standard
  • J1453/1_201906
  • Current
Published 2019-06-06 by SAE International in United States
The three parts of SAE J1453 cover material, dimensional, and performance requirements of steel O-ring face seal (ORFS) connectors for tubing and the O-ring face seal interface and nut portion of hose stem assemblies for nominal tube diameters of 6 through 50 mm.
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