Aiming at the optimal path and planning efficiency of global for intelligent driving, this paper proposes a dynamic method based on improved <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <msup> <mrow> <mi>A</mi> </mrow> <mi>∗</mi> </msup> </math> algorithm. First, improves heuristic function traditional id="M3"> algorithm to improve planning. Second, uses optimization strategy make smoother. Third, is combined with window real-time performance obstacle avoidance vehicle. Finally,...

Ultrasonic communication methods have been used for sending data through elastic solids such as steel pipes or plates to overcome physical hurdles that hamper the conventional (wired and RF wireless). EMAT (Electro Magnetic Acoustic Transducer), an ultrasonic signal generation technique generates different modes of waveform, is particularly useful hot, cold, dry environments, which many issues faced by PZT probes. In this paper, transmitter noncontact receiver system. This system designed...

Based on the needs of power processing unit (PPU) in space propulsion system, this paper analyzes application four-switch Buck-Boost converter (FSBB) field. In terms FSBB's control strategies, traditional single-mode strategy is low efficiency. While two-mode strategy's loop relatively complicated. What's more, near two modes' switching point, will continuously switch between Buck and Boost modes, which not conducive to stable operation system. So proposes an improved strategy. By fixing...

There are a variety of models and algorithms that solves classification problems. Among these models, Maximum Gaussian Mixture Model (MGMM) is model we proposed earlier describes data using the maximum value Gaussians. Expectation Maximization (EM) algorithm can be used to solve this model. In paper, propose multiEM approach MGMM train based classifiers. This combines multiple MGMMs solved by EM into classifier. The classifiers trained with on both artificial real life datasets were tested...

In this paper, an improved bidirectional RRT <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <msup> <mrow /> <mi>∗</mi> </msup> </math> vehicle path planning method for smart is proposed. method, the resultant force of artificial potential field used to determine search direction improve efficiency. Different kinds constraints are considered in including and driving environment constraints. The collision detection based on separating axis theorem detect between obstacles cubic...

Ultrasonic signals can be utilized as a viable communication method to transmit information through gas, liquid, and solid channels or mixed media consisting of interfaced with liquid and/or gas. Underwater using sound waves cause many challenges, often unforeseen, due absorption, scattering, refractions, reverberations, multipaths, doppler shifts, temperature, salinity, acoustic scintillation. the air is less prone environmental challenges that are encountered in underwater communications....

Ultrasonic communication is a technique of transmitting message through solids such as steel plates or pipes. Electromagnetic acoustic transducers (EMATs) are non-contact sensors able to generate and receive ultrasonic waves. In this study, periodic-permanent-magnet (PPM) EMATs used produce shear-horizontal (SH) We present experimental results show channel characterization SH waves carrying information over the frequency range 200 kHz 800 kHz. An platform was built for assessing wave...

Achieving a high bitrate (BR) and low bit error rate (BER) in ultrasonic communication through solids are challenging due to bit-wavelet spreading caused by the channel dispersion, attenuation, multipath effect. This undesirable effect is more pronounced particularly irregular shape channels like an elbow pipe bent or warped plates. Time-reversal (TR) signal processing promising technique which can compress of concentrate energy for improving BR. In this study, we examined performance TR...

Electromagnetic acoustic transducer (EMAT) is used as a noncontact sensor for communication in stainless-steel plate channel. The wave multipath propagations within the channel cause intersymbol interference (ISI). ISI highly degrades signal-to-noise ratio (SNR). poor SNR will result low bitrate and high bit error rate (BER). In this study, test platform designed to estimate performance of EMAT system. Two periodic-permanent-magnet (PPM) EMATs are be transmitter receiver. generates...

Ultrasonic guided waves can be used as the carriers of information in ultrasonic communication for pipe or plate channels. Permanent Periodic Magnet (PPM) Electromagnetic Acoustic Transducer (EMAT) potentially provide unique capabilities a system non-contact transmitter and receiver, which selectively generate different modes shear-horizontal (SH) waves. The SH wave shows potentials achieving high bitrate without error communication. However, when steel is channel, especially one with radius...

Based on the requirements of power processing unit(PPU), this paper proposes a converter suitable for its wide input and output voltage range applications. The first stage adopts four-switch Buck-Boost converter, which operates in two-mode state can meet request range. At same time, interleaved parallel technology is used to reduce inductor volume, so that density be increased. circuit topology second employs an LLC resonant converter. fixed frequency mode obtain stable transfer ratio,...

Aiming at precisely tracking an intelligent vehicle on a desired trajectory, this paper proposes trajectory planning and control strategy based improved terminal sliding mold. Firstly, the traditional RRT algorithm is by using target bias separation axis theorem to improve search efficiency. Secondly, mode controller designed. The comprehensively considers lateral error heading of control, stability system proven Lyapunov function. Finally, performance designed verified Matlab-Carsim HIL...

Ultrasonic communication is a desirable method for information transfer through solid channels such as metallic bars, plates, or pipes by overcoming the physical barriers that prevent conventional wired radiofrequency transmission. In this paper, we investigate architecture of reconfigurable software-defined ultrasonic (SDUC) platform can make use complete channel bandwidth real-time video transmission highly reverberant channel. Reverberations in are complex and generated surface wave, lamb...

In the field of classification, main task most algorithms is to find a perfect decision boundary.However, boundaries are too complex be discovered directly.Therefore, in this paper, we proposed an Incremental Maximum Gaussian Mixture Partition (IMGMP) algorithm for aiming solve those problems with boundaries.As self-adaptive algorithm, it uses divide and conquer strategy calculate out reasonable boundary by step.An Improved K-means clustering model used classifier.This also has been tested...

Ultrasonic communication through solid channels suffers from channel dispersion, attenuation, and multipath effect. For example, in elbow shape pipes or complex structures, the elastic waves are reflected reverberated resulting a major dispersion of signals. In such as flat bar, propagation is main reason for bit-wavelet spreading intersymbol interference (ISI). The conventional modulation method like OOK (on-off-keying) PSK (phase-shift-keying) fails to provide useful Signal-to-Noise Ratio...

The research on surface acoustic wave (SAW) tag has lasted many years. However, the application and promotion are unsatisfactory due to inherent defects of manufacturing technology large capacity SAW tag. From perspective practical production, this paper proposes a novel design reduce costs. method is based correlation IDT permutations combinations theory. At same time, some ideas about reader structure for given.

Ultrasonic communication is a technique that allows transmitting information through solid material such as tubes or bars using high-frequency elastic waves. The channels often extend into high-temperature range in the field of power, oil, nuclear industry. When temperature taken consideration, ultrasonic wave propagation channel complex and unpredictable. It necessary to study influence on guided improve communication. In this study, control system assembled adjust steel pipe ranging from...

This paper studies the problem of intelligent vehicle path planning based on improved RRT algorithm. Firstly, extended target bias strategy is used to make random point sampling algorithm biased point. Secondly, kinematics model, area limited feasible fan-shaped range in front that greater than step size d. Thirdly, process expansion, considering actual vehicles and obstacles, separation axis law detect collision risk surrounding obstacles real time. Finally, Matlab simulation platform,...

With the continuous impact of environmental pollution, traditional generator represented by fossil fuels is gradually being replaced renewable energy generators. Different from conventional optimal planning, which only includes photovoltaic (PV) and wind turbines. This paper adds use fuel cells (FC) miniature steam turbines with PV systems turbines, can make up for defect fluctuation its output power. In addition, a multi-objective model considering power loss, voltage profile, investment...

Vehicles will face different working conditions during the use, and have requirements for vehicle functions, which results in many subdivided models. An off-road is a subdivision model produced to adapt complex road conditions. In order conditions, vehicles should good passing ability, small size, flexibility. The six-wheeled has both ability volume, best choice vehicles. design of steering system becomes key step improve flexibility vehicle. This paper mainly designs an independent...

Ultrasonic communication through solid channels suffers from wave dispersion, attenuation, and multipath effect. It can be observed that the channel is frequency selective, some frequencies will severely attenuated as distance between transmitter receiver increases. Besides, when pipes are used channels, limited bandwidth adversarial reverberations even worse. Orthogonal division multiplexing (OFDM) has been widely in modern wireless systems due to its robustness against selectivity. The...