...Ali Maddahi; Nariman Sepehri; Witold Kinsner Design of fault-tolerant controllers (FTC) for hydraulic actuators is one of the challenges in the area of fluid power systems. In real applications, it is not possible to model or measure some faults accurately. For example, an accurate model...

...Florian Kock; Cornelius Ferrari This paper presents the design and implementation of a nonlinear feedforward control algorithm for a hydraulic actuator driven by a multistage servo valve. Combined with a conventional feedback control algorithm, high frequencies can be achieved even for large-scale...

... indicate that a considerable improvement in performance can be achieved by the implementation of this control strategy. 06 08 2009 12 02 2010 02 12 2011 02 12 2011 electrohydraulic control equipment hydraulic actuators hydrostatics pumps Hydraulic systems are commonly...

.... 15 02 2010 15 02 2011 29 09 2011 29 09 2011 design engineering hydraulic actuators perturbation techniques pistons pressure control pumps Variable-displacement, swash-plate type, axial-piston pumps are widely used in industrial and mobile applications...

.... 26 10 2009 13 01 2011 27 07 2011 27 07 2011 brakes electric propulsion hydraulic actuators mechanical stability optimisation vehicle dynamics control allocation Modelica modeling electric vehicles force constraints global chassis control vehicle stability...

...Stan van der Meulen; Rokus van Iperen; Bram de Jager; Frans Veldpaus; Francis van der Sluis; Maarten Steinbuch A reduction in the fuel consumption of a passenger car with a pushbelt continuously variable transmission (CVT) can be established via optimization of the hydraulic actuation system...

... between efficient on and off states, allowing any hydraulic actuator to have virtually variable displacement. An existing barrier to switch-mode control is a fast and efficient high-speed valve. A novel high-speed valve concept is proposed that uses a phase shift between two tiers of continuously rotating...

... of the faulty hydraulic actuator is first established, in the frequency domain, by Fourier transformation of acceptable actuator input-output responses. Then, a robust position control law is synthesized by quantitative feedback theory to meet the prescribed design tolerances on closed-loop stability...

... of traditional design and the improved closed-loop control performance in implementation. 04 04 2005 31 12 2008 19 03 2009 closed loop systems electric actuators electrohydraulic control equipment feedback hydraulic actuators optimal control valves deadband describing function...

...Hairong Zeng; Nariman Sepehri This paper addresses the tracking control of hydraulic actuators commonly used in many hydraulically actuated robotic systems. Dynamic model of the entire actuator incorporating highly nonlinear hydraulic functions and the LuGre dynamic friction model is used to arrive...

...Mark Karpenko; Nariman Sepehri; John Anderson In this paper, reinforcement learning is applied to coordinate, in a decentralized fashion, the motions of a pair of hydraulic actuators whose task is to firmly hold and move an object along a specified trajectory under conventional position control...

... . Avallone , E. , 1987 , Mark’s Standard Handbook for Mechanical Engineers , McGraw-Hill , NY. Ogata , K. , 1978 , “ System Dynamics ,” Prentice-Hall , Englewood Cliffs, NJ. 23 06 2005 17 10 2006 pneumatic actuators hydraulic actuators control system synthesis...

... and maintenance costs. 26 08 2004 24 05 2006 parameter estimation condition monitoring preventive maintenance hydrostatics hydraulic actuators electrohydraulic control equipment hydrostatic electrohydraulic actuator Condition and health monitoring is increasingly important...

...Kailash Krishnaswamy; Perry Y. Li Human operated, hydraulic actuated machines are widely used in many high-power applications. Improving productivity, safety and task quality (e.g., haptic feedback in a teleoperated scenario) has been the focus of past research. For robotic systems that interact...

... – 268 . Chinniah , Y. , 2004 , “ Fault Detection in the EHA using the EKF ,” Ph.D. thesis, University of Saskatchewan. hydraulic actuators materials handling equipment electrohydraulic control equipment design engineering In this paper we summarize the findings that were...

... without considering the track tension. The second method 2 compares the calculated track path length with the desired value and adjusts the position of the idler by a hydraulic actuator. Both methods should be categorized as indirect active tensioners in the sense that they actually do not use the track...

... design. This paper presents a discontinuous controller to regulate the transition mode in hydraulic actuators. The controller, upon sensing a nonzero force, positions the actuator at the location where the force was sensed, thus, exerting minimal force on a nonmoving environment. The scheme does...

... emulations require that the ground hydraulic robot and the space electrically-driven robot are dynamically equivalent, despite they are using different types of actuation. One possibility of establishing the dynamic equivalency between the hydraulic actuation and the electrical actuation is to pursue...

... vehicle suspension and ground/tire compliance, (iii) the friction between the tires and the ground, and (iv) the hydraulic actuators’ functions. The results demonstrate the effects of the manipulator movements, the flexibility of the contact between the base and the ground, the hydraulic compliance...

... a design example for an electrohydraulic system used in the noncircular turning process. The details of the modeling, system identification, and uncertain bound characterization for similar type of servovalve controlled hydraulic actuator can be found in 16 17 . Figure 8 shows the Bode plots...