Industrial press units are divided into two primary groups, single-action and double-action. A si... more Industrial press units are divided into two primary groups, single-action and double-action. A single-action press unit has a mechanism that guides drawing slide. A double-action press unit has a blank holder mechanism as well. A double-action press die has more weight and is more expensive than a single-action one. For the following reasons, single action die, uses for double action press that blank holder mechanism is not in use in this situation and unit changes to single action. The conclusion of this work is the dynamics and stress analysis of of the later state. In this work, for a kinematics analysis, a mathematical model of the mechanism is presented. Later, a dynamics analysis of the double-action mechanism with a standard die and with a small die of a single-action state is provided. This work is concluded by the stress analysis of the two states. Conclusions yield that the use of a single-action die for a double-action press increases the force and stress in the ram mecha...
Journal of Mechanics in Medicine and Biology, 2015
This paper deals with growth control of cancer cells population using type-1 and interval type-2 ... more This paper deals with growth control of cancer cells population using type-1 and interval type-2 fuzzy logic. A type-1 fuzzy controller is designed in order to reduce the population of cancer cells, adjust the drug dosage in a manner that allows normal cells re-grow in treatment period and maintain the maximum drug delivery rate and plasma concentration of drug in an appropriate range. Two different approaches are studied. One deals with reducing the number of cancer cells without any concern about the rate of decreasing, and the other takes the rate of malignant cells damage into consideration. Due to the fact that uncertainty is an inherent part of real systems and affects controller efficacy, employing new methods of design such as interval type-2 fuzzy logic systems for handling uncertainties may be efficacious. Influence of noise on the system is investigated and the effect of altering free parameters of design is studied. Using an interval type-2 controller can diminish the ef...
Volume 1: 20th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C, 2005
The atomic force microscope (AFM) system has evolved into a useful tool for direct measurements o... more The atomic force microscope (AFM) system has evolved into a useful tool for direct measurements of intermolecular forces with atomic-resolution characterization that can be employed in a broad spectrum of applications. In this paper, the nonlinear dynamical behavior of the AFM is ...
The Ionic polymer-metal composites (IPMCs) form an important category of electroactive polymers w... more The Ionic polymer-metal composites (IPMCs) form an important category of electroactive polymers which generate large deformation under a low driving voltage. In this paper an empirical model of IPMC is developed by measuring the step response of a 23 mm×3.6 mm×0.16 mm IPMC strip in a cantilever configuration. Moreover, a model-based precision position control of an IPMC base on the fuzzy logic is presented. Open-loop position responses of an IPMC are not repeatable, and hence closed-loop precision control is of critical importance to ensure proper functioning, repeatability and reliability. A CCD camera was used to observe the closed loop response of the IPMC strip in order to control this electro-mechanical actuator experimentally. The IPMC actuator could follow various commanded position trajectories such as sinusoidal and square position profiles. The control architecture presented includes a fuzzy system whose structure and parameters were designed by trail-and-error beside a ga...
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2010
In this paper, a novel robust adaptive control method is proposed for controlling the Lorenz chao... more In this paper, a novel robust adaptive control method is proposed for controlling the Lorenz chaotic attractor. A new backstepping controller for the Lorenz system based on the Lyapunov stability theorem is proposed to overcome the singularity problem that appeared in using the typical backstepping control method. By exploiting the property of the system, the resulting controller is shown to be singularity free and the closed loop system is globally stable. Due to unavailability of system states measurement in practice, the controller is selected such that only one system state is needed. To overcome the problem of parameter uncertainty, an additional term to Lyapunov function is added and an identification scheme is adopted to have a negative definite Lyapunov function derivative. The simulation results demonstrate the effectiveness of the proposed controllers and approaches.
Industrial press units are divided into two primary groups, single-action and double-action. A si... more Industrial press units are divided into two primary groups, single-action and double-action. A single-action press unit has a mechanism that guides drawing slide. A double-action press unit has a blank holder mechanism as well. A double-action press die has more weight and is more expensive than a single-action one. For the following reasons, single action die, uses for double action press that blank holder mechanism is not in use in this situation and unit changes to single action. The conclusion of this work is the dynamics and stress analysis of of the later state. In this work, for a kinematics analysis, a mathematical model of the mechanism is presented. Later, a dynamics analysis of the double-action mechanism with a standard die and with a small die of a single-action state is provided. This work is concluded by the stress analysis of the two states. Conclusions yield that the use of a single-action die for a double-action press increases the force and stress in the ram mecha...
Journal of Mechanics in Medicine and Biology, 2015
This paper deals with growth control of cancer cells population using type-1 and interval type-2 ... more This paper deals with growth control of cancer cells population using type-1 and interval type-2 fuzzy logic. A type-1 fuzzy controller is designed in order to reduce the population of cancer cells, adjust the drug dosage in a manner that allows normal cells re-grow in treatment period and maintain the maximum drug delivery rate and plasma concentration of drug in an appropriate range. Two different approaches are studied. One deals with reducing the number of cancer cells without any concern about the rate of decreasing, and the other takes the rate of malignant cells damage into consideration. Due to the fact that uncertainty is an inherent part of real systems and affects controller efficacy, employing new methods of design such as interval type-2 fuzzy logic systems for handling uncertainties may be efficacious. Influence of noise on the system is investigated and the effect of altering free parameters of design is studied. Using an interval type-2 controller can diminish the ef...
Volume 1: 20th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C, 2005
The atomic force microscope (AFM) system has evolved into a useful tool for direct measurements o... more The atomic force microscope (AFM) system has evolved into a useful tool for direct measurements of intermolecular forces with atomic-resolution characterization that can be employed in a broad spectrum of applications. In this paper, the nonlinear dynamical behavior of the AFM is ...
The Ionic polymer-metal composites (IPMCs) form an important category of electroactive polymers w... more The Ionic polymer-metal composites (IPMCs) form an important category of electroactive polymers which generate large deformation under a low driving voltage. In this paper an empirical model of IPMC is developed by measuring the step response of a 23 mm×3.6 mm×0.16 mm IPMC strip in a cantilever configuration. Moreover, a model-based precision position control of an IPMC base on the fuzzy logic is presented. Open-loop position responses of an IPMC are not repeatable, and hence closed-loop precision control is of critical importance to ensure proper functioning, repeatability and reliability. A CCD camera was used to observe the closed loop response of the IPMC strip in order to control this electro-mechanical actuator experimentally. The IPMC actuator could follow various commanded position trajectories such as sinusoidal and square position profiles. The control architecture presented includes a fuzzy system whose structure and parameters were designed by trail-and-error beside a ga...
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2010
In this paper, a novel robust adaptive control method is proposed for controlling the Lorenz chao... more In this paper, a novel robust adaptive control method is proposed for controlling the Lorenz chaotic attractor. A new backstepping controller for the Lorenz system based on the Lyapunov stability theorem is proposed to overcome the singularity problem that appeared in using the typical backstepping control method. By exploiting the property of the system, the resulting controller is shown to be singularity free and the closed loop system is globally stable. Due to unavailability of system states measurement in practice, the controller is selected such that only one system state is needed. To overcome the problem of parameter uncertainty, an additional term to Lyapunov function is added and an identification scheme is adopted to have a negative definite Lyapunov function derivative. The simulation results demonstrate the effectiveness of the proposed controllers and approaches.
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Papers by Aria Alasty