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Through and comprehensive tests are necessary to ensure complete stability and reliability of AUV, due to the high risk and consumption of in field testing, onshore testing technology for AUV is proposed. Rudder load simulator plays an important role in the onshore testing of AUV. In this paper, the design and development of a rudder load simulator was discussed. Rudder load calculation method during...
In order to accurately control the portable AUV, a dynamic modeling method based on computational fluid dynamics (CFD) and a improved Generalized Predictive Control (GPC) method were presented. First, the whole modeling process was described from two aspects: dynamic model derivation and model parameter identification. Second, the validity of the model and modeling method were tested by comparing...
This paper focuses on the problem of seabed survey mission with multiple target points distributed in large scale area. To complete the survey with AUVs in minimum cost, a two-step procedure using greed strategy is presented. In the first step, the locations of so-called anchor points are found by executing k-means algorithm iteratively. In the second step, an ant-cycle system is used to find out...
This paper reports a 3.0 THz detector which can detect the terahertz wave radiated by a quantum cascade laser (QCL) working at pulse mode. The detector was implemented in a 65 nm silicon CMOS process. The chip size is 1.5×l.5 mm2 including bonding pads. THz detector using FET is based on plasma wave theory proposed by Dyakonov and Shur which allows detection of THz radiations far beyond the FET devices...
This paper presents an 18-to-23 GHz sub-harmonically injection-locked all-digital PLL (SIL-ADPLL). It adopts the proposed injection-locked frequency divider aided adaptive injection timing alignment technique and uses a proposed (UP-DN) block to adjust the injection timing adaptively at output frequency higher than 20 GHz with low power consumption. A new pulse generator is proposed to relax the trade-off...
Dancing is always challenging especially for beginners who may lack sense of rhythm. Salsa, as a popular style of dancing, is even harder to learn due to its unique overlapped rhythmic patterns made by different Latin instruments (e.g., Clave sticks, Conga drums, Timbale drums) together. In order to dance in synchronization with the Salsa beats, the beginners always need prompts (e.g., beat counting...
Off-highway dump truck contains amounts of potential energy and kinetic energy. During the braking process, these two parts are consumed in the form of heat on the braking resistance, and the energy consumption will be about 24 percent of total energy consumption of the Truck. Hence, it is necessary to recover the braking energy. This paper, aiming at the characteristics of electric drive system in...
Large scale multiple input multiple output (MIMO), commonly referred to as massive MIMO, is one of the most important physical layer disruptions in network evolution that would lead to significant increase in spectral and energy efficiency envisioned for 5G networks. However, the computational complexity of massive MIMO system becomes the key problem for its practical implementation. As known, Differential...
Real-time tracking of subway riding will provide great convenience to millions of commuters in metropolitan areas. Traditional approaches using timetables need continuous attentions from the subway riders and are limited to the poor accuracy of estimating the travel time. Recent approaches using mobile devices rely on GSM and WiFi, which are not always available underground. In this work, we present...
The energy efficiency level of wind turbines reflected its operation efficiency and provides evidence for the diagnosis. Currently, the evaluation study is concerned essentially with a part of Wind Turbine, but that has limitations. This paper establishes a synthetic evaluation index system of the energy efficiency evaluation of Wind Turbine from five respects, which include Comprehensive, profitability,...
In this paper, speed control curve of stepper motor was studied for optimizing the motion flexibility and improving the motion precision of the stepper motor under the open-loop control environment based on Microcontroller Unit (MCU). Firstly, the acceleration and deceleration control curve of trapezoidal and New S model was designed respectively. Secondly, the relationship curve between control pulse...
Accurate time measurement is the key technique for oscillating cup viscometer. In order to overcome the error due to environmental noise, a direct counter of pulse time interval was selected to measure the attenuated time related to viscosity, and then viscosity values are thus calculated. A measurement circuit composed of laser signal acquisition, time interval synthesis and time interval measurement,...
An IR-UWB indoor positioning is proposed in the paper that combines the algorithm of Time-of-Arrival (TOA) and band-gap modulations. The positioning is referenced by three UWB locators that have different band-gap and deployed in a right triangle. An object can determine its position by identifying pulse backscattered on locators and each locator's signatures through recognizing the exact segment...
The primary goal of this research is to explore algorithmic approaches to build a robust, multi-scale, affordable, and effective border surveillance strategies for tracking aerial and ground targets (e.g. drug-smuggling UAVs) via various types of sensors in three layers. To this end, we propose a comprehensive planning and control framework based on dynamic-data-driven, adaptive multi-scale simulation...
This paper introduced the analysis to an early ESD failure caused by the plasma protection diodes used for MIM capacitors in an SOI CMOS technology. TLP ESD testing on multiple designs and transient ESD simulations with various combination of schemes were employed to identify the reason for the early failure, which was confirmed later by OBIRCH. Solution was proposed and verified by both simulation...
OFDM (Orthogonal Frequency Division Multiplexing) system is one of the most widely used power line communication (PLC) systems, and the noise of power line channel is one of the main factors that affects the reliability of power line communication. The development of power line communication technology is of great practical significance for the remote monitoring and remote meter reading of power system,...
In this paper, a new method for ranking interval grey numbers to address the challenge in multi-criteria decision making problems with interval grey numbers has been proposed. This new method involves the risk preferences of decision makers. First, we propose a new method to rank the interval grey numbers by comparing the possibility degree or whitened-value. Second, we classify the decision makers...
This paper collected and classified the failure modes and mechanisms of quartz crystals from actual engineering application. Through related failure analysis cases, combined with scanning electron microscopy and energy spectrum analysis, failure analysis results of quartz crystals of common failure mechanism were presented and studied. The quality and process controlling and reliability screening...
This study used partial least squares to assess the component-based structural equation model. The results show that the tactics of service providers, such as special treatment and punitive contracts, determine customers perception of switching barriers, which is related to switching intention. Policy regulators are suggested to redress unreasonable contractual obligations to reduce customers requests...
VibSense pushes the limits of vibration-based sensing to determine the location of a touch on extended surface areas as well as identify the object touching the surface leveraging a single sensor. Unlike capacitive sensing, it does not require conductive materials and compared to audio sensing it is more robust to acoustic noise. It supports a broad array of applications through either passive or...
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