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The paper deals with the problem of controlling the impact between a mechanical system, having n degrees of freedom, and a body possibly subject to elastic/plastic. deformations. Goal of the proposed control scheme is the regulation of the impact force to a desired vaine, while imposing a prescribed configuration to the system, even in presence of possible plastic deformations of the body. The behaviour...
Generally, friction/disturbance compensation is an important issue in high-precision motion control applications. In particular, when the system under control undergoes low-speed or reversal motions, the friction force and external disturbances will degrade motion accuracy. Therefore, to achieve satisfactory motion performance, it is necessary to simultaneously compensate for the friction force and...
This paper presents an approach to the indirect simultaneous positioning task of deformable objects based on robust linear output regulation methods. Indirect control requires maneuvering control points defined on a deformable body to desired locations by manipulating points located elsewhere on the object. The proposed control scheme uses a linearization of the deformable object dynamics into a state-space...
Estimating the vehicle side slip angle using the signal of the current sensors on-board is very important for the Vehicle Dynamic Control systems and an estimation algorithm is proposed in this paper. This algorithm which can meet the requirement of real-time and nonlinearity is based on a nonlinear observer that contains a modified Dugoff tire model. At first, the longitudinal and lateral forces...
This paper addresses the control problem of extending the travel range of a MEMS electrostatic actuator through a closed-loop voltage control scheme. Since the electrostatic actuator is inherently unstable due to its pull-in limit, one of the major control goals is to stabilize the actuator system beyond the limit. In addition, the controller has to be robust against external disturbances and noise...
A new traction control which utilizes the maximum transmissible torque estimation (MTTE) scheme to execute the anti-slip control of electric vehicles is proposed in this study. Since the function of embedded knowledge mechanism, the chassis velocity and information about tire-road conditions is unnecessary. A closed-loop observer with disturbance estimation performance is employed to enhance the steering...
This paper presents the estimation of the force applied by a piezocantilever dedicated to micro-manipulation/microassembly. Relative to previous works, the presented method avoids the reliance on the force dynamics on the characteristics of the micro-objects. Furthermore, the estimation is a closed-loop kind technique so that convergency can be ensured efficiently. To perform these, we consider the...
The paper presents a control architecture for robotic-assisted surgery in the presence of physiological motions. Dynamic and kinematic models, operational space, computed torque, discrete state space and stochastic design are addressed in the control. Inner loops are based on position and velocity signals and outer loops have force measurements. Two active observers (AOBs) are introduced for force...
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