Modeling and Simulation of Active Hydro-Pneumatic Suspension System Through Bond Graph

Emami, Mohsen Davazdah; Mostafavi, Seyed Alireza; Asadollahzadeh, Payam

doi:10.5755/j01.mech.17.3.509

Cited by 12 publications

(9 citation statements)

References 7 publications

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“…8–11 It involves transforming the system into a dynamic simulation model in source code form and it is popularly used by different researchers for analyzing systems having the interaction of multi energy domains. 13,14 The bond graph models for both the systems are shown in Figure 3. The following assumptions are made in the model development.…”

Section: Modeling Of the Hydraulic Systemmentioning

confidence: 99%

Influence of locking and passive soft switching on hydraulic circuit efficiency

2017

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Throttling and fluid compressibility losses are the major losses which occur during the valve transition in a switched mode hydraulic circuit. To minimize the throttling energy loss, a soft switch concept with lock and release mechanism was introduced by different researchers. In the literature, two different kinds of soft switches, one locking and another passive, were introduced in a hydraulic circuit. Thereafter, experimental validation was reported considering only a locking-type soft switch. But the influence of the passive soft switch on the performance of the hydraulic system was not reported. In this article, how the passive soft switch would affect the system efficiency has been investigated through bond graph model simulation. It has been shown both numerically and experimentally by other researchers that the use of a passive soft switch and a locking mechanism, depending upon configuration, can lead to more than 66.1% reduction in throttling energy loss. In this article, it has been further shown that an additional 3.25% throttling energy is saved when the passive soft switch is discarded from the system and only the locking mechanism is retained. The critical parameters of the locking soft switch have been optimized through multi-run simulation and, thereafter, a relationship between the critical parameters of the locking soft switch and the throttling energy loss of the valve has been obtained by using multiple regression analysis. Also, the variations of energy losses with respect to different valve orifice areas, duty cycles, and pulse width modulation frequencies are investigated through simulation.

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Section: Modeling Of the Hydraulic Systemmentioning

confidence: 99%

Influence of locking and passive soft switching on hydraulic circuit efficiency

2017

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“…Hydro-pneumatic suspensions can be divided into active hydro-pneumatic suspensions and passive hydro-pneumatic suspensions. The main research objectives of active hydro-pneumatic suspensions are control methods and strategies [5][6][7][8]. For example, optimal control theory, PID control theory [9], fuzzy control theory [10], adaptive control theory [11], robust control theory [12], genetic algorithm control theory, neural network control theory [13] and compound control theory.…”

Section: Introductionmentioning

confidence: 99%

Research on Nonlinear Characteristics of Hydro-pneumatic Suspension with Hydraulic Preload

Gao

Chen

2021

E3S Web Conf.

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The hydro-pneumatic suspension of special vehicles is mainly used to transmit vertical force and ease the impact and vibration caused by uneven road surface. As a new type of elastic element, the Hydro-pneumatic suspension generally uses inert gas or nitrogen as the elastic medium and hydraulic oil as the force transmission medium. Compared with ordinary leaf springs and coil springs, it has the advantages of small size and strong load-bearing capacity. This paper compares the Hydro-pneumatic suspension with hydraulic preload under different conditions and finds that under reasonable parameters, the hydro-pneumatic suspension can provide more stable performance.

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“…Vehicle suspensions can be modelled by a MDOF (multiple degree of freedom) nonlinear vibration system with wide-band random excitation, suitable for application of exact feedback linearization or statistical linearization [6][7][8]. Exact feedback linearization is adopted to analyze hydropneumatic suspension by LI, et al [9] and SHI, et al [10] and satisfactory results are achieved in simulation.…”

Section: Introductionmentioning

confidence: 99%

Statistical Linearization of Nonlinear Stiffness in Hydropneumatic Suspension

Cheng

Kong

2018

MATEC Web Conf.

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Hydropneumatic springs are the elastic components of a vehicle’s suspension. As the nonlinear characteristic of the spring is difficult to express accurately, the statistical linearization method is introduced to analyze the dynamic response of the hydropneumatic spring. The nonlinear stiffness of a hydropneumatic spring is approximated by a quadratic polynomial at the static equilibrium position. Parameters of the hydropneumatic spring, road roughness and vehicle velocity are provided and analytical functions for equivalent stiffness and the dynamic equilibrium position are worked out in this paper. The analytical functions are validated through numerical simulation and are shown to be more accurate than those validated by existing methods. The method proposed here could be used in the design and analysis of hydropneumatic suspensions in future.

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Modeling and Simulation of Active Hydro-Pneumatic Suspension System Through Bond Graph

Cited by 12 publications

References 7 publications

Influence of locking and passive soft switching on hydraulic circuit efficiency

Influence of locking and passive soft switching on hydraulic circuit efficiency

Research on Nonlinear Characteristics of Hydro-pneumatic Suspension with Hydraulic Preload

Statistical Linearization of Nonlinear Stiffness in Hydropneumatic Suspension

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