Effects of Viscosity and Type of Oil on Dynamic Behaviors of Friction of Hydraulic Cylinder

Tran, Xuan Bo; Matsui, Akinori; Yanada, Hideki

doi:10.5739/jfps.41.28

Cited by 5 publications

(7 citation statements)

References 11 publications

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“…The hysteretic loop predicted by the new modified LuGre model remains in the velocity range of and its size becomes smaller with increasing frequency. By varying the parameters v b , v s , F c , and σ 2 with the frequency as shown in Equation (12), the new modified LuGre model can predict accurately the expansion of the hysteretic loop to high velocities as well as the reduction of the friction force at small velocities with increasing frequency as shown in Figure 14. It is noted in Equation (12) that f is the frequency of velocity variation, f 0 is a standard frequency and takes a value 1 Hz, and v b , v s , F c , and σ 2 are the parameters that are identified from the steady-state friction characteristic at each condition of pressures.…”

Section: Dynamic Friction Characteristicsmentioning

confidence: 99%

“…However, all these models cannot simulate well the dynamic friction behaviors of a hydraulic cylinder in the sliding regime as shown in [10]. Yanada and Sekikawa [10] have made a modification to the LuGre model by incorporating lubricant film dynamics into the model and it has been shown that the proposed model, called the modified LuGre model, can simulate the dynamic behaviors of friction observed in hydraulic cylinders with a relatively good accuracy [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Friction Behaviors of Pneumatic Cylinders

Tran¹,

Yanada²

2013

ICA

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This paper deals with experimental investigation and modeling of dynamic friction behaviors in the sliding regime of pneumatic cylinders. Using three pneumatic cylinders, friction characteristics are investigated and modeled under various conditions of velocity variation and pressures. It is shown that a hysteretic behavior can be seen at low velocities in the friction force-velocity relation and the friction force varies nearly linearly with the velocity at high velocities. The hysteretic loop is expanded to higher velocities when the frequency of the velocity variation is increased, and its size is increased with increasing driving pressure and is decreased with increasing resistance pressure. It is shown that such behaviors can be relatively accurately simulated by the new modified LuGre model in which a few static parameters are varied with the frequency of velocity variation.

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Section: Dynamic Friction Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Friction Behaviors of Pneumatic Cylinders

Tran¹,

Yanada²

2013

ICA

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“…Tran et al [8] have revised the modified LuGre model [6] for simulating the dynamic friction behavior of hydraulic cylinders by replacing the usual fluid friction term with a first-order lead dynamics. This model is called the new modified LuGre model (NMLGM).…”

Section: Friction Model New Modified Lugre Modelmentioning

confidence: 99%

“…This model was developed from the LuGre model [7] by adding a lubricant film dynamics into the LuGre model and was called the modified LuGre model. The validity of the modified LuGre model was verified by the measured dynamic friction behavior of hydraulic cylinders under various conditions of piston velocity using different hydraulic oils [6,8]. However, Tran et al [9] showed that the modified LuGre model is valid only in negative resistance regime, i.e., in the velocity range that friction force reduces with increasing velocity and that it cannot simulate the hysteretic behavior observed in the hydraulic cylinders in fluid lubrication regime.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Friction Behavior in Pre-Sliding Regime of Pneumatic Actuators

Tran

Long

Yanada

2017

AEJ

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This paper focuses on investigating friction behavior in pre-sliding regime and developing a new mathematical model of friction for fluid power actuators. Using pneumatic cylinders with different sizes, an experimental setup is built to measure friction force-displacement characteristics in presliding regime under various conditions of pressures in the cylinder chambers. A new mathematical model of friction for the pneumatic cylinders is proposed by incorporating a hysteresis function into the new modified LuGre model. The experimental results show that when the pressures are varied, friction of the pneumatic cylinders in pre-sliding regime is represented by behavior of a nonlinear spring. In addition, hysteresis behavior with nonlocal memory is obtained in the friction forcedisplacement characteristics and that the size of the hysteresis loop is increased with increasing pressures in the cylinder chambers. The simulation results show that the new friction model can accurately simulate the friction behavior of the pneumatic cylinders in pre-sliding regime as well as sliding regime.

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“…They also assumed the thermal system to be known and linear that is not the case in practical systems and could not be applied to a wide range of applications. Tran et al assumed the viscosity coefficient as a temperature dependent function, considering the temperature dependency in the Stribeck friction part and proposed an extended dynamic friction model to capture the temperature effects. Zhongyu studied the temperature effects on harmonic drive systems based on which he proposed a fuzzy model applicable in a limited temperature range…”

Section: Introductionmentioning

confidence: 99%

Passivity‐based adaptive control of a 2‐DOF serial robot manipulator with temperature dependent joint frictions

Azizi

Yazdizadeh

2019

Adaptive Control & Signal

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Mechanical systems are always suffering from the effects of temperature dependent friction forces where the system is operated in a wide range of temperature.Temperature and its variation play an important role in friction force in mechanical systems. If it is not compensated, it will tend to unwanted consequences, including steady-state errors, limit cycling, and hunting. Therefore, it is necessary to take the temperature effects into account. This has been a strong motivation for the researchers to work on temperature effects on joint friction. In this paper, an adaptive compensation (control) scheme is proposed and applied to a 2-degree-of-freedom serial robot manipulator by taking the temperature effects into account on the joints friction. In the proposed control scheme, the temperature is not required to be sensed. In this paper, joint friction is described by LuGre dynamic model with temperature dependent parameters. These parameters are described by some functions with unknown temperature dependent terms. According to the mathematical and practical concepts, the temperature dependent friction is decomposed into a viscous term and a disturbance term. An adaptive controller is designed to compensate the friction effect and it is shown that the proposed controller relaxes the condition for a priori knowledge about the environment characteristics, including the upper and lower bounds of the environment temperature and the parameters of the functions, describing the temperature dependent joint frictions. The stability and convergence of the joint position and velocity are proved in the sense of Lyapunov and then the proposed method is confirmed by the simulations.

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Effects of Viscosity and Type of Oil on Dynamic Behaviors of Friction of Hydraulic Cylinder

Cited by 5 publications

References 11 publications

Dynamic Friction Behaviors of Pneumatic Cylinders

Dynamic Friction Behaviors of Pneumatic Cylinders

Dynamic Friction Behavior in Pre-Sliding Regime of Pneumatic Actuators

Passivity‐based adaptive control of a 2‐DOF serial robot manipulator with temperature dependent joint frictions

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