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Hydraulic Power Pump Test Procedure

CTTC C1, Hydraulic Systems
  • Ground Vehicle Standard
  • J745_201911
  • Current
Published 2019-11-20 by SAE International in United States

This test code describes tests for determining characteristics of hydraulic positive displacement pumps used on off-road self-propelled work machines as referenced in SAE J1116.

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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
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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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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Miniature Stretchable Pump

  • Magazine Article
  • TBMG-35296
Published 2019-10-01 by Tech Briefs Media Group in United States

Soft robots have a distinct advantage over rigid robots: they can adapt to complex environments, handle fragile objects, and interact safely with humans. Made from silicone, rubber, or other stretchable polymers, they are ideal for use in rehabilitation exoskeletons and robotic clothing. Soft bio-inspired robots could one day be deployed to explore remote or dangerous environments.

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Hydraulic Pump Airborne Noise Bench Test

Vehicle Performance Steering Committee
  • Ground Vehicle Standard
  • J2747_201909
  • Current
Published 2019-09-13 by SAE International in United States
Communicate the process of accurately measuring sound power levels of positive displacement hydraulic pumps commonly used in ground vehicle steering systems. This recommended practice defines the pump mounting (pulley, belt tension, isolation), operating conditions (fluid, speed, temperature, pressure), room acoustics, instrumentation, noise measurement technique and data acquisition setup to be used. Included are recommendations for test sample size, and format for data presentation/reporting.
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Study of Friction Optimization Potential for Lubrication Circuits of Light-Duty Diesel Engines

General Motors-Salvatore Mafrici, Francesco Barba, Mauro Mattis
Published 2019-09-09 by SAE International in United States
Over the last two decades, engine research has been mainly focused on reducing fuel consumption in view of compliance with stringent homologation targets and customer expectations. As it is well known, the objective of overall engine efficiency optimization can be achieved only through the improvement of each element of the efficiency chain, of which mechanical constitutes one of the two key pillars (together with thermodynamics).In this framework, the friction reduction for each mechanical subsystems has been one of the most important topics of modern Diesel engine development. In particular, the present paper analyzes the lubrication circuit potential as contributor to the mechanical efficiency improvement, by investigating the synergistic impact of oil circuit design, oil viscosity characteristics (including new ultra-low formulations) and thermal management.For this purpose, a combination of theoretical and experimental tools were used. The effects of oil pressure regulation, oil pump size and speed, oil temperature and viscosity have been thoroughly evaluated. Experiments were conducted both at component test rig for oil pump and at engine-vehicle test bench on a new common-rail light-duty Diesel…
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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.
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Microscale Electro-Hydrodynamic (EHD) Modular Cartridge Pump

  • Magazine Article
  • TBMG-34929
Published 2019-08-01 by Tech Briefs Media Group in United States

The EHD pump uses electric fields to move a dielectric fluid coolant in a thermal loop to dissipate heat generated by electrical components with a low-power system. The pump has only a few key components and no moving parts, increasing the simplicity and robustness of the system. In addition, the lightweight pump consumes very little power during operation and is modular in nature. The pump design takes a modular approach to the pumping sections by means of an electrically insulating cartridge casing that houses the high-voltage and ground electrodes along with spacers that act as both an insulator and flow channel for the dielectric fluid.

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Holistic hydraulic designs add more sensors, controls

SAE Truck & Off-Highway Engineering: August 2019

Terry Costlow
  • Magazine Article
  • 19TOFHP08_07
Published 2019-08-01 by SAE International in United States

Hydraulic system developers are moving on many different fronts as they strive to improve performance and efficiency. A full-system approach that includes more sensors and advanced controls is helping design teams reduce component counts without sacrificing performance.

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Light-Activated Micro-Pump

  • Magazine Article
  • TBMG-34919
Published 2019-08-01 by Tech Briefs Media Group in United States

Even the smallest mechanical pumps have limitations, from the micro-fabrication techniques required to make them to the fact that there are limits on their size. A laser-driven photoacoustic microfluidic pump was developed that is capable of moving fluids in any direction without moving parts or electrical contacts. The pump uses a plasmonic quartz plate implanted with gold atoms to move liquids with a laser that generates an ultrasonic wave.