New Hydraulic System Modelling

Pfeiffer, Friedrich; Borchsenius, Fredrik; Foerg, M.

doi:10.1115/detc2003/vib-48431

Cited by 5 publications

(3 citation statements)

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“…In order to obtain an accurate model that can be using to guide practice, build a simulation model on AMESim as shown in Figure 6. 26,27 Figure 6. Simulation model.…”

Section: Characteristic Analysismentioning

confidence: 99%

Design and analysis of mechanic-hydraulic servo control steering system for pure rolling in multi-axle vehicle

Huang

2016

Advances in Mechanical Engineering

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With more axles for multi-axle vehicles, conventional steering trapeziums are unable to let every tire fit Ackermann steering which cause tire wear increasingly more serious. To alleviate this problem, an original mechanic-hydraulic servo steering system with a controllable tie rod is designed. By controlling the angle of one wheel and the length of tie rod, both wheels can be controlled as per default trajectory which implemented Ackermann steering. This article utilized mechanic-hydraulic servo feedback to design a mechanic-hydraulic servo valve which controlled the tie rod accurately. It ensured dynamic characteristics of steering wheels and driving force. To understand inherent characteristics of system, the mathematical model was established. The transfer function was derived, and this high-order system was reduced by Routh approximation. Analyzed natural frequency and the main parameter (the gain coefficient of displacement) which influences the dynamic characteristics had been found out. Analysis shows that the lower the gain coefficient, the higher the speed of response. Moreover, the accurate simulation model of servo system is built on AMESim. Contrasting five groups of simulation results, it is obtained that the influence rule of the gain coefficient is consistent with theoretical analysis. This research provides a useful reference for future nonlinear control.

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“…In order to obtain an accurate model that can be using to guide practice, build a simulation model on AMESim as shown in Figure 6. 26,27 Figure 6. Simulation model.…”

Section: Characteristic Analysismentioning

confidence: 99%

Design and analysis of mechanic-hydraulic servo control steering system for pure rolling in multi-axle vehicle

Huang

2016

Advances in Mechanical Engineering

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“…To have a better understanding of leakage in WSSs, to control pressure and leakage effectively, and for optimal design of WSS, suitable modeling is an important prerequisite (Pfeiffer and Borchsenius, 2004). To this end a well-known modeling framework is the statespace modeling.…”

Section: State-space Modeling and Projectionmentioning

confidence: 99%

Toward model-based control of non-linear hydraulic networks

Tahavori

Jensen

Kallesøe

et al. 2012

Journal of Vibration and Control

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Water leakage is an important component of water loss. Many methods have emerged from urban water supply systems (WSSs) for leakage control, but it still remains a challenge in many countries. Pressure management is an effective way to reduce the leakage in a system. It can also reduce the power consumption. To have a better understanding of leakage in WSSs, to control pressure and leakage effectively, and for optimal design of WSSs, suitable modeling is an important prerequisite. In this paper a model with the main objective of pressure control and consequently leakage reduction is presented. Following an analogy to electric circuits, first the mathematical expression for pressure drop over each component of the pipe network (WSS) such as pipes, pumps, valves and water towers is presented. Then the network model is derived based on the circuit theory and subsequently used for pressure management in the system. A suitable projection is used to reduce the state vector and to express the model in standard state-space form.

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“…This small time scale increases the computational costs of simulations. As reported by Pfeiffer and Borchsenius [8], the high computational costs are mainly due to the mathematical representation of the hydraulic systems used in the simulations, which are non-linear, first order differential equations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Treatment of Singularity in Hydraulic Circuits Using Singular Perturbation Theory

Oshtorjani

Mikkola

Jalali

2019

IEEE/ASME Trans. Mechatron.

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Hydraulic cylinders and motors are commonly used in actuator systems of mobile machines and industrial applications. Hydraulic actuators have the ability to offer large amounts of energy density. To analyze the dynamic behavior of a hydraulic actuator system, the hydraulic circuit is generally divided into volumes in which pressure is assumed to be equally distributed. Pressure within these volumes can be predicted by employing first order differential equations. To achieve an accurate numerical presentation of a hydraulic circuit, pressures within very small volumes must often be calculated. The small volumes involved in the hydraulic circuits make the models numerically stiff and consequently a very small integration time step is required. In this paper, singular perturbation theory, which can be applied to problems in which a small value appears with singularity effects, is implemented as a computationally-efficient method for modeling hydraulic circuits. The implementation is performed in two stages: derivation of the perturbed equations; and modification of their effects. It is shown that usage of a perturbation theory based approach alleviates problems associated with small volumes in hydraulic system modeling and substantially enhances computational efficiency, thus facilitating real-time simulation.

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New Hydraulic System Modelling

Cited by 5 publications

References 0 publications

Design and analysis of mechanic-hydraulic servo control steering system for pure rolling in multi-axle vehicle

Design and analysis of mechanic-hydraulic servo control steering system for pure rolling in multi-axle vehicle

Toward model-based control of non-linear hydraulic networks

Numerical Treatment of Singularity in Hydraulic Circuits Using Singular Perturbation Theory

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