Browse Topic: Electrohydraulics

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Nonlinear Iterative Optimization Process for Multichannel Remote Parameter Control10-03-03-001510/14/2019
In this article, compared with traditional Remote Parameter Control (RPC), the iterative process is improved based on linear transfer function (TF) estimation of the nonlinear dynamic system. In the improved RPC, the iteration coefficient is designed according to the convergence condition of the nonlinear iterative process, so that the convergence level, convergence speed, and iteration stability could be improved. The difference between the traditional and the improved RPC iterative process is discussed, the RPC iterative process of the nonlinear system is analyzed, and channel decoupling for Multi-Input Multi-Output (MIMO) system based on eigen-decomposition of the system TF and linear TF estimation is introduced. It assumes that the eigenvector matrix of the system TF remains the same, and the linear TF in the iterative process is estimated and updated, which is used for iterative calculation. The method for iteration coefficient is designed according to the nonlinear system
Li, Meng, Zhang, Yong
Journal Article
Eaton12OFHD0503_0305/03/2012
Insights into sustainability: Environmental, economic, and/or societal goals for a successful, and long-lasting, off-highway industry. - Unskew the talent system and build a sustainable future We live in an age dominated by technology. It's so ubiquitous we seldom consider the fact that every bit of it is a product of human ingenuity. Someone, somewhere, sometime was sufficiently intrigued by a challenge that he or she applied their intelligence, talent, and training to create a solution. I am willing to bet the word “technology” immediately conjured up an image of a smart phone, tablet, or laptop in your mind. One of the main reasons why technology has become synonymous with electronics, and particularly computers, is because electronics and computer science have become huge consumer industries that naturally attract both R&D investments and talented people because of the potential for large returns.
VanArsdale, William
Magazine Article
SAE Off-Highway Engineering 2010-10-2810OFHD102810/28/2010
Making the leap from remanufacturing to new manufacturing Next-generation straddle carrier has intelligent controls, electrohydraulic braking.
Magazine
Sauer-Danfoss - Managing tomorrow's big challenges with today's limited resources10OFHD0803_1008/03/2010
Executive Viewpoints-Vehicle Development Insights from Industry: Driving Factors for Future Innovation. While dealing with the unpleasant results of the last year, engineering teams also undoubtedly looked toward the future-most specifically, at new regulations that are in place or on the near horizon. New EU functional safety standards, the advent of Tier 4 in the U.S. and Stage IV in Europe, and the continuing end-user demands of a better operator experience are all compelling events that must be addressed. On top of (or perhaps in spite of) these new regulations, customers demand these machines more quickly than ever, and OEM senior management teams require machines that differentiate themselves in the market. Even through these tough times, Sauer-Danfoss has been working as part of our customers' development teams to take on these big challenges. Despite the downturn, our test lab and research work has continued. We've taken a vehicle-by-vehicle approach to expand our applications
Weston, Marc
Magazine Article
My electronic crystal ball is full of hydraulic fluidOFHAUG09_0608/01/2009
Executive Viewpoints-Vehicle Development Insights from Industry: Off-Highway 2020 and Beyond-My electronic crystal ball is full of hydraulic fluid. Being asked to look a decade into the future is really a daunting challenge. But being intimately associated with leading-edge hydraulic and electronic technologies as the President of Eaton's Hydraulics Group, I can tell you a couple of things right now with absolute certainty. One, I don't have a clue as to what to expect in 10 years.
VanArsdale, William
Magazine Article
SAE Off-Highway Engineering 2009-02-01OFHFEB0902/01/2009
Whistle down the wire Collaboration between OEMs and suppliers leads to new advances, and challenges, for electrohydraulic system control. Chipping away at drivetrain challenges Chips, sensors, controllers, software all combine to help engineers improve efficiency. Engineering disciplines unite Design tools help disparate groups provide input throughout the development process. Innovative thinking 101 West Virginia University professor Dr. James E. Smith issues a call for innovation as one of the central themes of his term as SAE's 2009 President.
Magazine Issue
Operators hail cab upgradesOFHOCT05_0410/01/2005
Improving efficiency is new design target. The study of ergonomics has brought marked changes in areas ranging from workplaces to vehicles. Those whose workplace is a vehicle also expect to find cabs that are more comfortable. Manufacturers are responding with interiors that come much closer to those of the cars and pickups that bring operators to worksites. Designers are reducing noise, improving comfort, and offering better sight lines as they attempt to make operators more efficient by reducing fatigue.
Costlow, Terry
Magazine Article
SAE Off-Highway Engineering 2005-10-01OFHOCT0510/01/2005
Hybrids go heavy The payoff for hybrid technology is high for vehicles with hefty payloads. A new era for electrohydraulics More components are designed with electronics in mind. Heavy-duty testing gets SWIFT Wheel-force transducers are helping to provide data-measurement capability faster and more economically than ever before. Operators hail cab upgrades Improving efficiency is new design target.
Magazine Issue
Hydraulic mattersOFHAPR05_0304/01/2005
There is much potential for gain for everyone if OEMs and suppliers work together early in terms of hydraulic system design. Modern off-highway equipment is some of the most powerful, most productive, most impressive machinery ever built. The key to that success is fluid power. It seems, in fact, that the primary function of equipment is to deliver fluid power to the site so that buckets and blades can do their work. As such, it is imperative that OEMs work closely with fluid-power-component manufacturers, no matter how big the OEM, or how vast its knowledge of fluid power.
Ries, Richard
Magazine Article
SAE Off-Highway Engineering 2002-10-01OFHOCT0210/01/2002
Including electrohydraulics As electrohydraulics technologies mature and expand, the cost of incorporating them into equipment continues to decrease. Operating the machine As long as people need to be in a machine to run a machine, operator stations will continue to become more operator-friendly.
Magazine Issue
SAE Off-Highway Engineering 2001-10-01OFHOCT0110/01/2001
More with less through electronic components Off-highway engineers have had to walk a precarious path in recent years by developing engine technologies that offer customers better vehicle performance and regulators lower emissions. The promises and problems of electrohydraulics Engineers acknowledge that electrohydraulics are the way of the future for the off-highway industry, and that the field itself could use a good public-relations campaign to attract more engineering students. Deere goes all out for agriculture To some, it may seem odd that John Deere picked this particular economy to launch over 50 new products, the most in its 164-year history. To others it reeks of confidence. Switching control in hydraulic drives Researchers from Johannes Kepler University believe agricultural machinery can be improved by further advances in motion generation.
Magazine Issue
Development of an Electrohydraulic Bin Position Control System for Mobile Harvesting Equipment Using Bond Graphs96179808/01/1996
Many of the advances in mechatronic design and electrohydraulic controls have not been fully utilized on mobile equipment. Many operations, like the positioning storage bins on most mobile vegetable harvesting machines are controlled by the driver with a manually operated directional control valve located in the cab. Most storage bins on harvesting machines are located behind the cab, often requiring the operator to look back to view the product and reposition the bin while driving the harvester. Frequently, because of distractions or visual obstructions, the operator can not advance or reposition the storage bin during operation thus causing the incoming harvested product to “back-up” into the grading and conveying systems on the machine. When the product backs-up on the machine, overfilling and excessive product damage occurs. Using bond graph modeling and simulation, a control system to automatically position storage bins on mobile vegetable harvesting equipment was designed. The
Glancey, J. L.
Technical Paper
Improving Mobile Equipment Performance Using New Flow and Pressure Feedback Technology96180108/01/1996
A recently patented transducer introduces new options for controlling and monitoring mobile equipment by measuring flow pressure, and temperature. Traditional flow transducers lack the robustness, accuracy, or responsiveness to be effectively used in actual hydraulic circuits outside the laboratory environment. Pressure transducers are used, but present packaging and cost obstacles to machine designers. Temperature sensors are also available in various subsystems in mobile equipment. Accurate monitoring or control of a fluid system depends upon dynamic measurement of the flow and pressure in a system, but at the same time it is important that the monitoring apparatus is capable of measuring small variations in relatively large flow rates. A new device has been developed in a cartridge format which solves previous limitations. The cartridge mounts easily into a manifold block, and can be produced economically. Output signals are analogue voltages suitable for digital display or
Kadlicko, George, Hampson, Greville
Technical Paper
Vickers New Technologies Applied to Electrohydraulic Controls96179908/01/1996
Vickers Discovery Series EMV Electrohydraulic Mobile Valve is one of the most advanced new products introduced by Vickers in 1996. The EMV is a four-way proportional flow control valve intended for Load Sensing systems. The concept is based on separated meter-in and meter-out valve elements in combination with several new technologies such as Valvistor, Anti-Saturation, Meter-in and Meter-out Pressure Control. The valve is microprocessor controlled, programmable and communicates via a CAN-Bus. The valve could easily be specified with an interactive Windows based configuration software.
Andersson, Bo R., Martin, Andrew D. A.
Technical Paper
Simulation of an Electrohydraulic Hitch Control System on an Agricultural Tractor87081804/01/1987
The tremendous pressures on the agricultural economy are forcing the use of electronic controls on agricultural equipment for greater operational efficiency. One of the first significant electronic controls on an agricultural tractor is for automatic actuation of the three-point hitch. This paper discusses the use of simulation in the development of such an electronic hitch control system.
Olson, David J., Cornell, Charles R.
Technical Paper
Constant Speed Electrohydraulic Drive Mechanism for a Green Pea Harvester86119609/01/1986
The threshing mechanism of a Green Pea harvester is described with the drives previously used compared to a constant speed drive consisting of a variable displacement pump with electrohydraulic controls driving a fixed displacement motor. The electrohydraulic controls include an electrical displacement control device with its signal provided by a closed loop feedback controller. The advantage of the constant speed drive is a higher quality product harvested and improved harvesting flexibility.
Sanderson, Douglas G.
Technical Paper
Intelligent Servo Control as Trade-Up Technology86119709/01/1986
While advanced electrohydraulic control devices have been used in aerospace, defense and the upper segment of commercial applications for many years, this technology has not been available for broader commercial applications. The result is that most industrial applications are limited to the use of on/off-type valves that severely restrict the degree of control and precision. Increasingly, commercial applications need greater modulation in their control functions and intelligent servo control, using microchip technology, can provide an option as a trade-up technology.
McCormick, Joseph F.
Technical Paper
Electrohydraulic System Response - Nonlinear vs Linear83132809/12/1983
The results from an investigation of some of the effects of using a linearized model for prediction of the behavior of a nonlinear system are presented. The system studied is a velocity system using an electrohydraulic servoactuator to drive an inertial load. Both nonlinear and linearized system models are defined. The result of defining optimal feedback values for an integral quadratic performance index is shown along with the effect of choice of nominal operating point on the linearized system transient response. Finally, linear and nonlinear transient responses are compared for a range of step amplitudes.
Lance, G. M., Kleaveland, A. T.
Technical Paper
Electro-Hydraulic Power Units69079102/01/1969
This paper considers the design and application of the electrohydraulic power unit for direct current installations. It discusses the advantages provided by the packaged power unit and advocates its selection for certain vehicular applications.
Stone, S. Herbert
Technical Paper
Variability Analysis of Precision Mechanical Devices64061701/01/1964
An analytical method has been developed for estimating variability in the performance of a precision mechanical device that arises from variability of its internal parameters. This parameter variability is due both to initial in-tolerance variations and to subsequent environmental and time-dependent effects. A mathematical model of the device is formulated to define the relationships between individual parameters and various performance characteristics. This model is then manipulated on either an analog or a digital computer to permit calculation of partial derivatives of performance characteristics with respect to internal parameters. These partials are used in evaluating the Propagation of Variance formula, a mathematical statement that relates performance variance (an index of variability) to parameter variances (which must be known) and to the partial derivatives. This analytical approach is called the Moment method because it makes use of the mean and variance, the first two
Mesloh, R. E., Mark, D. G.
Technical Paper
Electrohydraulic Servovalves in Flight Control and Utility ActuatorsC1303
This four-hour short course intends to present an overview of electrohydraulic flow control servovalves commonly used in flight control and utility actuators. The scope of this course covers the history and design of servovalves, as well as their most common performance characteristics. This course will provide participants an understanding of the application of electrohydraulic servovalves in hydraulically powered actuators and preparation of the servovalve procurement specification.
Simkin, Roman
Instructor Led
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