The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present an accelerated algorithm for hierarchical density based clustering. Our new algorithm improves upon HDBSCAN*, which itself provided a significant qualitative improvement over the popular DBSCAN algorithm. The accelerated HDBSCAN* algorithm provides comparable performance to DBSCAN, while supporting variable density clusters, and eliminating the need for the difficult to tune distance scale...
The well-known maximum torque per ampere (MTPA) strategy is usually integrated the field oriented control (FOC) to improve the efficiency of interior permanent-magnet (IPM) synchronous motor drives. As an alternative to the FOC, direct torque control (DTC) has attracted extensive attention from both academia and industry in the last few decades, due to its distinctive advantages, e.g., fast dynamic...
This paper uses results from geometric mechanics and control to determine the degree of coupling between actuated and unactuated degrees of freedom in a two-link biped robot. By comparing the degree of coupling when ankle actuation is used and when hip actuation is used, it is clear that ankle actuation affords stronger dynamic coupling and hence, may provide a superior means for control design for...
By using the vector control for direct-drive permanent magnet synchronous motor (DD-PMSM), the current static decoupling between d-axis and q-axis is realized, however, there still exists the dynamic coupling relationship. The d-q currents cannot be decoupled by the tradition PI method, and although the decoupling is accomplished to some extent by the internal model decoupling control method, the...
This paper is concerned with the distributed control for robust output regulation of multi-agent systems(MASs) with adaptive event-triggered mechanism. A novel distributed adaptive control law based on output feedback is developed, which can avoid using the minimal nonzero eigenvalue of Laplacian matrix associated with global system topology and reduce the frequency of data transmission. It is shown...
This paper presents an analytical decoupling approach to designing a velocity and altitude tracking autopilot for a generic hypersonic vehicle (GHV). Different from other decoupling control methods which need to design a decoupler and a controller, the adopted design method only needs to design one controller to satisfy both set-point tracking and decoupling requirements simultaneously. Besides, the...
Under the high-speed operation, the control precision of the industrial robot is low and the robustness is poor due to the coupling effects of joints, inertia parameter variation and external disturbance. In order to solve these problems, a nonlinear compensation control algorithm of high-speed operation robot is proposed by combining the PID control method with the automatic disturbance rejection...
Identifying the physical person behind an SNS account has become a critical issue in investigations of SNS-involved crime cases. It is a challenging task because information provided by users on an SNS platform could be false, conflicting, missing and deceptive. One way to gain an accurate profile of a user is to link up all their multiple accounts created on different social platforms, which is referred...
Making use of the attractive properties of silicon (Si), a wide array of highly functional photonic devices have been demonstrated over the past few decades [1]. Although planar platforms are still the most prominent choice for integrated systems, more recently silicon fibres have gained increased attention due to their simple fabrication methods and flexible device designs [2]. However, despite their...
The dramatic progress in power-scaling of ultra-short pulse (USP) lasers and their continuous expansion use in industrial applications call for flexible and robust beam delivery systems (BDS) over several meters. Recently, a new branch of hollow-core photonic crystal fiber (HC-PCF) based on inhibited coupling (IC) mechanism has been proposed and successfully applied to demonstrate the delivery of...
In a previous work, the possibility to eavesdrop digital signals transmitted along differential interconnects was explored by resorting to sensing loop(s), operated as hardware Trojans placed in close proximity of the data lines. To maximize coupling, ideal (i.e., symmetric) positioning of the receiving loop(s) with respect to the differential interconnect was considered. However, since in practice...
In this work, we focus on the problem of obtaining the optimal interlink structures, which maximizes the robustness of networks against random node failures, in a cost constrained setting. Using percolation theory based system equations, we have formulated our objective as a constrained optimization problem and designed algorithms serving two key purposes: i) obtaining the budget limits, Bl and Bu...
This paper presents a novel manufacturing paradigm for constructing origami-inspired pop-up robots for future space exploration missions. The new approach uses a textile-enhanced rigid-flex printed circuit board (PCB) to implement a folding robot chassis using robust, spaceflight-tolerant materials, and integrates the robot electronics directly into the chassis for added compactness. The new approach...
Most batteries require constant voltage to charge; therefore, wireless charging receivers need a constant voltage circuit, commonly a DCDC converter (DDC). On the other hand, Resonant Magnetic Coupling enables multi-receiver charging. As a result, we need to design a wireless charging system for multi-receivers with a DDC. In cases of multi-receiver charging with different positions, the input voltage...
High voltage gain is required in many practical wireless power transfer(WPT) systems and the robustness of voltage is very important for wireless power transfer systems with high voltage gain. This work proposes a method to select the optimal topology with good performance in three aspects: robustness, voltage gain and transfer efficiency for several common topologies of WPT system, and optimize the...
This work defines and quantifies a measure of robustness for vehicular networks with arbitrary physical arrangements and communication structures. The measure quantifies the minimum disturbance energy that is required to cause a collision between any two vehicles in terms of the ℒ2-norm of disturbances distributed throughout the network. The minimum disturbance size that can cause a collision is then...
ECPT is a novel technology which utilizes capacitive coupling to realize wireless energy transfer. But, it is well known that ECPT system is very sensitive to parameters variation. In order to improve system robustness, a novel quasi sliding mode control method is proposed. A GSSA model is building up and a quasi sliding mode variable structure control strategy is proposed accordingly. Finally, the...
Robustness analysis method is proposed for rotorcraft pilot coupling with helicopter flight control system in loop. Combining with the lateral identification model of BO-105 helicopter, McRuer's pilot model, and the designed stability augmentation system, frequency domain model is established for rotorcraft pilot coupling analysis. μ analysis method and performance specifications in ADS-33E are adopted...
An experimental approach is proposed to validate the theoretical energy-based considerations for wearable UHF RFID antenna design. On the basis of numerical analysis, it has been shown that wearable antennas presenting an energy density peak far from the antenna border are more robust with respect to the distance from the human body. A flexible and cost-effective RFID tag characterization and performance...
Wearable/implantable devices, e.g., heart-rate-monitor straps and implanted wireless sensors, need to be ultra-low-power (ULP), compact, and also robust against the proximity effect, which can significantly degrade the antenna and front-end performance and hence battery lifetime. A fully integrated adaptive front-end with a tunable matching network (TMN) using low-power and fast impedance detection...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.