Analysis of Wave Propagation Effects in Transmission Lines due to Digital Valve Switching

Kogler, Helmut; Scheidl, Rudolf; Schmidt, Bernd Hans

doi:10.1115/fpmc2015-9607

Cited by 15 publications

(15 citation statements)

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“…Similarly, Kogler et al investigate the pressure wave propagation due to digital valve switching in [56]. Again, three transducers are used to measure the wave.…”

Section: Active Damping Of Pressure Pulsations Due To Switchingmentioning

confidence: 99%

Digital Hydraulic Technology for Linear Actuation: A State of the Art Review

Donkov

Andersen

Linjama

et al. 2020

TJFP

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This paper analyses the current state of the art in linear actuation with digital hydraulics. Based on the differences in their aims the paper partitions the area into four actuation concepts – parallel valve solutions, single switching valve solutions, multi-chamber cylinders, and multi-pressure cylinders. The concepts are evaluated based on accuracy and smoothness of motion, switching load, reliability, efficiency and the number of components required.

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“…Similarly, Kogler et al investigate the pressure wave propagation due to digital valve switching in [56]. Again, three transducers are used to measure the wave.…”

Section: Active Damping Of Pressure Pulsations Due To Switchingmentioning

confidence: 99%

Digital Hydraulic Technology for Linear Actuation: A State of the Art Review

Donkov

Andersen

Linjama

et al. 2020

TJFP

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“…The 'Soft-Switching' concept is proposed to eliminate the energy losses during the switching transition [14,15]. Also, the wave propagation effect along the pipeline has been investigated in [5,16]. However, there is no study related to the 'optimal inertance tube', which considers the optimal tube diameter and length corresponding to different system operating frequencies and ratios.…”

Section: Figure 1: Schematics Of Switched Inertance Hydraulic Systemsmentioning

confidence: 99%

A Global Optimisation of a Switched Inertance Hydraulic System based on Genetic Algorithm

Pan

2017

Linköping Electronic Conference Proceedings

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The switched inertance hydraulic system (SIHS) is a novel high-bandwidth and energy-efficient device which can adjust or control flow and pressure by a means that does not rely on throttling the flow and dissipation of power. The three-port SIHS usually consists of a high-speed switching valve, an inertance tube and an accumulator. The device can provide an efficient step-up or stepdown of pressure or flow rate by using a digital control technique. The existing analytical models of an SIHS can effectively predict the flow response, pressure loss, system characteristics and efficiency. The optimal switching frequency and ratio of an SIHS can also be accurately estimated by using the analytical models. However, there is no study related to the 'optimal inertance tube', which considers the optimal tube diameter and length corresponding to different system operating frequencies and ratios. In other words, there is inertia and resistance balance of the system. This paper investigates the global optimisation of an SIHS based on genetic algorithm. The energy cost function is proposed, and the optimal solutions are presented. Numerical simulation models are used to validate the results. It provides a general guidance of the SIHS design and its parameter optimisation.

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“…This is the simplest form but requires pipe lengths in the range of a meter or longer, depending on the switching frequency and required flow rate. The wave propagation processes in this pipe can lead to cavitation by standing waves [12]. The coupling of inertia and resistance is strong which complicates the design of an effective inertance element.…”

Section: Introductionmentioning

confidence: 99%

The Hydraulically Controlled Oscillating Piston Converter

Scheidl

2021

Energies

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One way to realize inertia in energy saving hydraulic switching converters is a mechanical oscillator connected to a piston. Its two basic advantages over the use of fluid in an inductance pipe are higher compactness and a better decoupling of inductance and capacitance; these are opposed by a more complex valve system, which raises costs if electric control is applied. This paper presents and studies an oscillating mass converter with pure hydraulic control. It features a pressure control function and constitutes a step-up converter. A simple model is established to elucidate the basic properties of the function principle under idealized conditions. The complete system with the hydraulic control concept is studied by an elaborate dynamical model. It is shown that the converter is able to operate in the intended way under the conditions of the mathematical model. A potential application for a load sensing type meter out control of a cylinder drive is sketched.

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Analysis of Wave Propagation Effects in Transmission Lines due to Digital Valve Switching

Cited by 15 publications

References 0 publications

Digital Hydraulic Technology for Linear Actuation: A State of the Art Review

Digital Hydraulic Technology for Linear Actuation: A State of the Art Review

A Global Optimisation of a Switched Inertance Hydraulic System based on Genetic Algorithm

The Hydraulically Controlled Oscillating Piston Converter

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