Analysis and Mitigation of Valve Switching Losses in Switched Inertance Converters

Wiens, Travis

doi:10.1115/fpmc2015-9600

Cited by 6 publications

(5 citation statements)

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“…Transmission lines of arbitrarily changing cross section can be modelled using this approach by successively connecting multiple tapered transmission line segments together. Using shaped inertance tubes has theoretically shown an increase in efficiency over using uniform tubes [8], and by applying this model, higher accuracy and speed in these simulations are expected. …”

Section: Discussionmentioning

confidence: 99%

“…The approximate transmission matrix they derived was taken further in [6] by applying modal analysis (MA) and rational polynomial transfer function approximations (RPTFA) of the transcendental functions in the solution, allowing for simulations to be performed in the time domain. No further research into modelling tapered lines has appeared in the literature until this point, and the need for a robust, fast, and accurate model for tapered transmission lines has heightened with the growth in switched inertance converter research [8]. This paper will look at modelling tapered fluid lines using the TLM model and optimization procedure similar to that in [3] where weighted transfer functions make up the E, F, and G transfer functions.…”

Section: Introductionmentioning

confidence: 99%

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Modelling Dynamic Response of Hydraulic FluidWithin Tapered Transmission Lines

Buhs¹,

Wiens²

2017

Linköping Electronic Conference Proceedings

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This paper examines modelling the laminar dynamic fluid responses within hydraulic transmission lines that have a tapered shape from the inlet to outlet. There are excellent models available for fast simulation of pressure and flow dynamics within uniform lines, however the established models for tapered lines have some notable inaccuracies and simulation complexities. The transmission line method (TLM) structure is applied in this paper since it can be computed quickly and has shown to accurately model the effects of frequency-dependent friction. This paper presents a method of optimizing the TLM weighting functions, minimizing the error between the TLM transmission matrix terms and a numerical exact solution. Optimizations have shown that using the TLM to model tapered lines has improved accuracy over the existing models when compared in the frequency domain. Two-dimensional interpolation of a look-up table is possible allowing for quick selection of the optimized parameters. This model can be used in numerous applications where line dynamic effects must be accounted for, especially with digital hydraulic switched inertance converters.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling Dynamic Response of Hydraulic FluidWithin Tapered Transmission Lines

Buhs¹,

Wiens²

2017

Linköping Electronic Conference Proceedings

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“…In 2015, Wiens et al modelled and quantified the switching loss for an HBC and suggested that a shaped inertance tube and a tank-flow valve positioned along the tube could reduce the switching loss. The methods were investigated in simulation, and showed increased volumetric and energy efficiencies [40,41]. In 2018, the team proposed an improved transmission line model (TLM) for a tapered tube by optimising the weighting functions of conventional TLM models [23].…”

Section: Load Inertance Tubementioning

confidence: 99%

A Review of Switched Inertance Hydraulic Converter Technology1

Yuan

Pan

Plummer

2020

Journal of Dynamic Systems, Measurement, and Control

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Digital hydraulics is a new technology providing an alternative to conventional proportional or servovalve-controlled systems in the area of fluid power. Digital hydraulic applications, such as digital pumps, digital valves and actuators, switched inertance hydraulic converters (SIHCs), and digital hydraulic power management systems, promise high-energy efficiency and less contamination sensitivity. Research on digital hydraulics is driven by the need for highly energy efficient hydraulic machines but is relatively immature compared to other energy-saving technologies. This review introduces the development of SIHCs particularly focusing on the work being undertaken in the last 15 years and evaluates the device configurations, performance, and control strategies that are found in the current SIHC research. Various designs for high-speed switching valves are presented, and their advantages and limitations are compared and discussed. The current limitations of SIHCs are discussed and suggestions for the future development of SIHCs are made.

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“…Similarly, the orifice opening area of a flow-controlled rotary valve was derived by Okhotnikov et al, 20 and the flow characteristics and pressure loss characteristics of the rotary valve were studied. The pressure drop and local loss before and after the pilot control ball valve (PCGV) at different inlet velocities were analyzed by Jin et al 21 When the digital valve was switched from one position to another, the switching loss caused by the flow pressure drop through the valve was quantified by Wiens et al 22 The rapid rotation of the rotary valve port will cause the instantaneous change of the pressure difference, so the cavitation phenomenon and the influencing factors were analyzed by Lu et al 23 In addition, the crevice flow caused by the unsteady movement of the valve spool was also studied.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flow characteristics and throttling loss of a novel high-frequency two-dimensional rotary valve

Ren

Tang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part I:

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High-speed on-off valve uses its high-frequency characteristics to realize the switching effect of fast opening and closing or generate relatively continuous pressure and flow. Compared with the conventional direct acting structure, the frequency of reciprocating sliding of the valve spool is limited due to the need to overcome the large inertial force, while the valve spool of the rotary valve structure can easily achieve continuous and rapid rotary movement, which makes it easier to quickly open or close the hydraulic valve. Therefore, a novel high-frequency two-dimensional rotary valve is proposed. Through the two-dimensional rotary valve, the fluid is discretized in the form of fluid pulse width modulation to realize the flow distribution according to the demand of the system actuator. The spool has two independent degrees of freedom: the rotary motion of the spool is used to control the frequency of the fluid pulse width modulation and the axial displacement of the spool is used to control its width. Inspired by the working principle of the high-speed on-off valve to realize the instantaneous release of energy by quickly opening action, the flow characteristics and throttling loss of two-dimensional rotary valve are analyzed. The shape of the valve port of the high-frequency two-dimensional rotary valve is designed, flow field models with different valve port angle are established and the throttling loss of the valve port is obtained, which is verified by the simulation and the experiment. The working principle of two-dimensional rotary valve is similar to the high-speed on-off valve group, but compared with the high-speed on-off valve using the electric signal control mode, two-dimensional rotary valve can control the flow only by controlling the axial position of the valve spool. The high-frequency two-dimensional rotary valve using fluid pulse width modulation is expected to be used in variable system, load sensing system, distributed power source and other systems with variable and energy-saving requirements.

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Analysis and Mitigation of Valve Switching Losses in Switched Inertance Converters

Cited by 6 publications

References 0 publications

Modelling Dynamic Response of Hydraulic FluidWithin Tapered Transmission Lines

Modelling Dynamic Response of Hydraulic FluidWithin Tapered Transmission Lines

A Review of Switched Inertance Hydraulic Converter Technology1

Analysis of flow characteristics and throttling loss of a novel high-frequency two-dimensional rotary valve

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