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Time-varying formation control problems for mobile robot swarm systems are investigated. Firstly, for the formation control, the mobile robot is regarded as a point-mass system, and the dynamics of each mobile robot is modeled by single integrator. Then, consensus-based formation protocols are presented for mobile robots to achieve a predefined time-varying formation. Necessary and sufficient conditions...
The static wireless charging of electric vehicle has many disadvantages, such as long charging time, short mileage, and bulky battery pack. In order to study the primary winding of the parallel electric vehicle dynamic wireless charging, a double primary, single receiving winding wireless power transmission system model, it is found that the mutual inductance of the system will have a significant...
The arc energy has an important influence on the breaking capacity of switches. Based on the theory of magneto-hydrodynamics, a simplified two-dimensional dynamic arc model of switch is established and the variation law of arc temperature, current and arc shape are analyzed under the conditions of different breaking velocity and load characteristics. At the same time, the arc voltage, arc current...
We propose and demonstrate two types of infinite impulse response (IIR) microwave photonic filters (MPFs) with different structures, named cascaded structure and parallel structure. Both structures are based on the homogeneous multicore fiber (MCF) in which the inter-core power coupling has been established by tapering technique. The quality factors (Q factors) of cascaded and parallel structures...
Traditional medical model is more emphasis on sitting, with the popularity of mobile Internet, mobile smart medical system is got the attention by more and more people. In this paper, the use of pre-safety assessment and testing, the overall consideration of the Internet area within the business area security needs, after the security incident analysis and response to the security platform for continuous...
Bumpless transfer allows smooth switch between two different controllers. An innovative approach for bumpless transfer is put forward in this paper. It is a data-driven scheme that can enhance the transient performance of swithed system. Controller state initialization method is used to minimize the performance of the closed-loop switching system outputs. In this paper, the bumpless transfer of the...
The architecture of the Microsoft Catapult II cloud places the accelerator (FPGA) as a bump-in-the-wire on the way to the network and thus promises a dramatic reduction in latency as layers of hardware and software are avoided. We demonstrate this capability with an implementation of the 3D FFT. Next we examine phased application elasticity, i.e., the use of a reduced set of nodes for some phases...
Ultrasonic standing waves (USWs) particle sorting has shown great potential to develop diverse applications in biotechnology and medical research due to its ability to offer non-contact, label-free particle manipulation. Currently, most reported on-chip acoustic particle sorters rely on high Q-value materials and elaborate geometry designs, which make these devices not easy to build and unsuited for...
Directional dark matter detection seeks to reconstruct the angular distribution of dark matter particles traveling through the laboratory. A directional detector with high spatial resolution has the potential to increase the sensitivity per unit volume by over two orders of magnitude, but requires the development of a high-channel-count, high-speed readout system. This paper describes an FPGA-based...
FPGAs have emerged as a cost-effective accelerator alternative in clouds and clusters. Programmability remains a challenge, however, with OpenCL being generally recognized as a likely part of the solution. In this work we seek to advance the use of OpenCL for HPC on FPGAs in two ways. The first is by examining a core HPC application, Molecular Dynamics. The second is by examining a fundamental design...
The previously reported on-chip acoustic particle sorters mostly rely on high Q-value materials and elaborate geometry designs, which makes these devices not easy to build and unsuited for mass fabrication. In this work, we presented a novel two stage acoustic particle sorting approach with the advantages of operating on low-cost polymer-based microchips and using integrated micromachined ultrasound...
This work presents the design and evaluation of a low-cost tri-axial force sensor, that has been developed to regain the sense of touch in minimally invasive surgeries (MIS). The force sensor uses an array of force sensitive resistors (FSR) with a mechanically pre-loaded structure to perform the force sensing. The sensor has a built-in signal conditioning circuitry to provide on-board power regulation,...
Warpage measurement and control are critical for package design and optimization. In this paper, the warpage of a fingerprint module fabricated with the thin-core substrate (0.21+/−0.04 mm in thickness) was investigated. Shadow moiré test was conducted to follow the warpage changes of the modules and bare thin-core substrates in a simulated reflow process. The average initial warpage of five modules...
This study combines finite element (FE) modeling and digital signal processing (DSP) to predict the fatigue life of a ball grid array (BGA) package mounted on the print circuit board (PCB) under a random vibration loading. First, the board-level assembly was modeled using ABAQUS. Then the modal analysis and a following power spectrum analysis were performed to calculate the power spectral density...
In this paper, by using grey system theory, grey relation analysis and trend prediction was carried out for the influencing factors of agricultural mechanization development levels in major granary provinces in China. At present, the total power of agricultural mechanization, total income from agricultural mechanization, fuel consumption for agricultural production have great influence on the agricultural...
As in-line interference between geostationary(GEO) and Non-Geostationary(NGEO) systems is becoming more and more serious. We propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for spectral coexistence of GEO and NGEO satellites to mitigate in-line interference. Results of Simulation show that the proposed scheme can improve the performance of the NGEO system in comparison...
A non-probabilistic structural damage identification algorithm based on static strain energy (SSE) is presented in this paper. In order to overcome the shortcoming of traditional uncertainty quantification methods in modeling nondeterministic parameters, this paper adopts the non-probabilistic interval analysis approach to deal with the system uncertainties. Once the interval bounds of structural...
This paper deals with the cooperative control problem for second-order agents formation circling along meridian and parallel on a given sphere centered at a target of interest, where the direction of the target's movement is known to each agent but the target's speed is unknown. By using local measurements of relative position, a novel distributed solution is proposed by separatively designing each...
This paper is concerned with the state estimation problem in the presence of multiple random delay and packet dropouts in both channels from sensor to estimator and actuator to controller and simultaneously with quantized measurements for linear discrete system. The compensation model for delayed and lost packets is first proposed to improve the performance by always using the one who is the most...
Lithium-ion battery has already become the third generation of space energy storage with higher specific energy, lower ratio of self-discharge and other remarkable advantages. Robust and accurate battery prognosis is indispensable not just in satellite autonomous mission planning but also in self-determined maintenance. Prognosis based on indirect health indicators (HIs) provide an effective non-invasive...
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