Motion Control

Simulation of Fluid-Structure Interaction in Hydraulic Pump Design

Axial pumps with cam-driven commutation units — so-called PWK pumps — emerged as a result of a research project conducted in the Department of Hydraulics and Pneumatics at the Gdansk University of Technology. As for all axial hydraulic piston pumps, several cylinder chambers are positioned around the rotating shaft of an axial pump with cam-driven commutation units — called PWK pumps. The rotation of the shaft and the attached swash plate leads to movement of the pistons that alternately decreases and increases the fluid volume of the chambers. A window — which is part of the control sleeve or commutating bushing — connects the chamber between the pistons with the low-pressure and highpressure intake and outtake channels.

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Reducing Machine Controller Design and Deployment

Machine design and deployment requires integration of various technologies such as controls, mechanics, vision, lasers, data acquisition, and software, to mention only a few. These mechatronic solutions usually target a specific purpose such as part manufacturing, marking, packaging, etc. Often the controller is a key focus in the design because it must connect and coordinate all of the processes on the machine. Using separate programmable logic controllers (PLCs) and motion controllers necessitates integration, which is costly and time-consuming. Using a single controller for the machine eliminates the need for integration and shortens design and deployment time and cost.

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Underwater Autonomous Vehicles Combine Robotics and Vision to Inspect Oil Pipelines

Among the various components of a submarine pipeline, the vertical section known as a riser is critical to managing the pipeline. This section connects the piping that runs along the bottom of the sea with the floating production platform.

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Motion Control and System Engineering Considerations

Motion control choices are best made in light of the whole system architecture, as the selection of system architecture will drive not only the implementation and integration stages of the project, but also manufacturing and field service, and even the ability to ship and install the final product. We will first review a quick tour of system engineering, and then go on to the motion control specifics.

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Reducing Design Time for Linear Motion Systems

Design time can be reduced while ensuring durability and high performance. Reducing design time is critical in engineering because the result is lower costs and faster time to market. Design time often includes a number of non-value-added activities such as re-design, over-design, or scope creep that can be minimized by thoroughly understanding all of the application criteria and verifying calculations and analysis via parametric testing of components, modules, and full assemblies with data acquisition equipment, and proving out projected performance results with testing.

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Electronic Flow Control Valve (EFCV) with Pressure Compensation Capability

Flow control is one of the most critical functions in the hydraulic industry. Traditionally, flow control is implemented via a proportional or servo valve. When current is applied into the coil of a solenoid (proportional valve) or a torque motor (servo valve), a corresponding electromagnetic force is generated. These forces could either directly stroke the spool (single-stage configuration) or indirectly move the main stage spool via regulating the hydraulic pressures on each end of the main stage spool (multiple-stage configuration).

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Steer-by-Wire Systems with Integrated Torque Feedback Improve Steering Performance and Reduce Cost

Hydraulic steering systems have long dominated the industrial utility vehicle market because of their familiarity both to vehicle designers and operators. More recently, a trend has been seen towards the use of electronic steer-by-wire systems that provide greater design flexibility by enabling software to customize the connection between the steering wheel and steering mechanism. Several suppliers offer integrated steer-by-wire systems targeting the industrial utility vehicle market. A key differentiating factor is the method used to provide torque feedback to give the operator a heightened sense of vehicle control. The latest generation of integrated steer-by-wire systems consumes less power, is less expensive, and offers the ability to be programmed to provide a wide range of value-added features.

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