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The aim of this study is to explore the possibility of using flux switching linear tubular machines in a free piston energy conversion (FPEC) system. In FPEC systems, acceleration and therefore speed are often relatively high, which impose to have a reduced number of poles, meanwhile the cogging force will be relatively high. In order to reduce the cogging force two techniques are combined. The analysis...
Five-phase tubular linear PM (TLPM) motors have high thrust force density, zero net radial force and volumetrically efficient. Conventional direct thrust control (DTC) improves the dynamic performance of TLPM motor, but exhibits significant ripple in thrust force and flux. To solve the problem, a new DTC strategy based on third-harmonic current suppression is proposed. The effect of inverter voltage...
Force computations are one of the most time consuming part in performing Molecular Dynamics (MD) simulations. Adaptively Restrained Molecular Dynamics (ARMD) makes it possible to perform fewer force calculations by adaptively restraining particles positions. This paper introduces parallel algorithms for single-pass incremental force computations to take advantage of adaptive restraints using the Message...
With rapid improvement in information and communication technologies, industrial automation systems are under the revolution. Legacy industrial automation systems lack flexibility and interoperability due to multi-layered architecture. From industrial cyber-physical system point of view, a new system architecture is needed to allow vertical and horizontal integration between all devices and systems...
Physical human-robot interaction is one of the hottest topic in robotics and safety issues are its fundamental aspect. The present paper contributes to this aspect in that collision detections can be completed on the servo level in an intuitive way. The principle of the proposed collision detection strategy is based on the relative difference of the feedback commanded torque, which is able to identify...
This paper presents a sliding mode hybrid impedance controller for complex interaction tasks. For easily implementing the scheme in embedded system, it is developed in discrete difference format. The hybrid impedance control is adopted since it is capable for both target impedance and force tracking. Then, the equivalent control based sliding mode control is introduced for robust to external disturbance...
Sliding mode control (SMC) design technique is a well-known control design method to cope with disturbance and uncertainty. This paper considers a new sliding model design technique for a class of second-order systems which are acted by friction force. Comparing to the global sliding model design technique, it designs the sliding mode for a specific sliding region. Outside the sliding region, the...
This paper presents a planar digital actuator based on hexagonal design. The actuator is comprised of a Mobile Permanent Magnet (MPM) surrounded by six Fixed Permanent Magnets (FPMs). The originality of the proposed actuator lies in its ability to reach six discrete positions in xy-plane with different stroke sizes (along x-axis: 0.50 mm and 1.00 mm; along y-axis: 0.86 mm). An analytical model has...
Asynchronous logic and power gating are promising techniques for low duty cycle applications which need maximal energy efficiency, which are becoming more common-place with the popularity of wireless and embedded systems. This paper investigates the potential use of Nano/Micro- Electro- Mechanical (N/MEM) switches as the means of power gating asynchronous computation. A systematic optimization of...
In a large number of experiments or devices, noise is usually viewed as an undesirable disturbance, hindering the measurement sensitivity or device performances. In some circumstances however, noise-induced phenomena can help, as in the case of stochastic resonance whereby a small coherent signal gets amplified resonantly by application of external noise. Stochastic resonance occurs in a wide class...
This paper presents a dual-source energy harvesting circuit that efficiently and simultaneously extracts the energy from a piezoelectric transducer (PZT) and a thermoelectric generator (TEG). The harvester operates in a dual-source pile-up mode (DPM) to efficiently extract the energy from both sources with an increment of the damping force, resulting in a 1452% improvement of power extraction even...
This paper presents a Dynamic Vision Sensor with a few interesting features. We directly readout the voltage on the logarithmic photo detector as the intensity information of the fired pixel. The computer is able to command the sensor to produce a full-frame picture at whatever time it needs. The sensor was implemented using AMS 0.35 μm 2P4M Opto process with an array of 384 × 320 pixels. Each pixel...
The problem of parameters identification is solved by means of the combined maximum principle. Its use allows one to decompose the original system into subsystems for each of the observed state variables. The first stage of solving the extremal problem is to solve the structural synthesis problem. Within its framework there are causal characteristics leading to the state changes. They are treated...
This paper proposes a control strategy capable of reducing the vibration while keeping a low torque ripple for a switched reluctance machine (SRM). The aim is to minimize the variation of the radial force and to optimize the torque control parameters. At first, the torque ripple reduction method is introduced, for which an off-line optimization of control parameters is adopted. Then, the vibration...
Atomic Force Microscope (AFM) subresonant tapping (SRT), for example, Peak Force QNM mode enables high-resolution imaging of properties such as probe-surface adhesion or viscoelastic dissipation that are typically beyond the capability of other AFM scanning modes. However, SRT is among the slowest methods for obtaining an AFM image. This paper presents a method for increasing the scanning speed of...
In this paper, we address the problem of time-varying communication delay in force reflecting bilateral teleoperation. We introduce a switching-control method that makes the communication channel passive independent of the time-varying delay. The advantage of our approach is that we do not need information about the delay or the rate of change of the delay. Our controller results in master/slave position...
The switching dynamics in the ferroelectric HfO2 is investigated using first principles calculations. Several possible switching pathways were first identified based on symmetry aspects of ferroelectricity. From calculations of the atomic response to finite electric fields however we find that in the two most likely pathways the inert oxygen atoms also play a role, in contrast to what had been reported...
As an ideal candidate for biology information detection, flexible resistance-array-type sensors have attracted extensive attention. But owing to the Neighbor Disturbance in resistance array, the accuracy of the sensors has been limited greatly. In the presented work, a novel resistance measuring circuit has been developed with equipotential shielding method, which shows a better accuracy in detecting...
This paper presents a novel full digital drive for voice coil motor (VCM) designed for the wafer stage (WS). Firstly, to suppress current ripple, the 5-level cascaded H-bridge switching power amplifier is put forward. Secondly, to resist external disturbances, a novel current control method based on proportional-integral (PI) control and Luenberger observer is proposed. Finally, the control method...
The aim of the paper is an improved mathematical model of Linear Switched Reluctance Motor including the effect of magnetic nonlinearities. The starting point for the model is the variation of the flux linkage with the current. This variation is analytically described using Fourier series. The final step is reserved to predict the dynamic performances of the LSRM. An analysis and comparison of these...
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