<div>Vehicle path tracking and stability management are critical technologies for intelligent driving. However, their controls mutually constrained. This article proposes a cooperative control strategy vehicle stability, based on the stable domain. First, using vehicle’s two-degrees-of-freedom (DOF) model Dugoff tire model, phase plane representation is constructed sideslip angle angular velocity. An enhanced method utilizing five eigenvalues employed to partition Second, by employing...

Abstract Recently, the 2 µm wavelength band has attracted increasing interest because of its potential prospects for free‐space and fiber optical communications. Silicon photonic integrated circuits can operate in this band, but a major challenge exists photodetectors photon energies are less than energy bandgap germanium which is material used silicon conventional communications bands. While it possible to have weak absorption at 2‐µm using strained defect states, need long length degrade...

<div class="section abstract"><div class="htmlview paragraph">Path tracking is a key function of intelligent vehicles, which the basis for development and realization advanced autonomous driving. However, imprecision control model external disturbances such as wind sudden road conditions will affect path effect even lead to accidents. This paper proposes an vehicle strategy based on Tube-MPC data-driven stable region enhance stability performance in presence interference. Using...

Abstract Photodetectors are one of the fundamental building blocks in integrated photonic systems. They mainly serve to convert optical electrical signals by absorbing photons semiconductors which have a bandgap smaller than photon energy. The constraint on energy relation commonly available semiconductor materials hinders application photonics for some emerging applications. Here novel waveguide detector with on‐chip heater is proposed. Tunable can be achieved via local heating, changes...

Bi-copter UAVs have emerged as more agile and energetically efficient flying platforms than quadrotor UAVs. Yet, they are challenging to control due the use of servo motors leading non-minimum phase roll dynamics. In this paper, we systematically investigate modeling, identification, such dynamics in an integrated way. We start with deriving first principle model, from which cause is clearly seen. Parameters derived model identified via experiments subsequently used design analyze a...

Recently, the emerging 2 μm waveband has gained increasing interest due to its great potential for a wide scope of applications. Compared with existing optical communication windows at shorter wavelengths, it also offers distinct advantages lower nonlinear absorption, better fabrication tolerance, and larger free carrier plasma effects silicon photonics, which been proven device technology. While much progress witnessed photonics waveband, primary challenge still exists on-chip detectors....

The intervention time of stability control system is determined by judgment, which the basis vehicle control. According to different working conditions vehicle, we construct phase plane vehicle's sideslip angle and angular velocity, establish sample dataset stable region planes. To reduce complexity division avoid large amount data, established support vector regression (SVR) model, realized automatic dynamic region. testing test set shows that model in this paper has strong generalization...

The COVID-19 pandemic is a major challenge for society as whole, and analyzing the impact of spread epidemic government control measures on travel patterns urban residents can provide powerful help city managers to designate top-level prevention policies specific measures. This study investigates whether it more appropriate use groups POIs with similar pedestrian flow unit rather than functional categories POIs. In this study, we analyzed hour-by-hour data key locations in Beijing before,...

The path tracking controller can easily reduce the error, but often exceed limitations of vehicle stability. In this paper, an intelligent control strategy considering data-driven dynamic stable region constraints is proposed. Firstly, based on two-degree-of-freedom (DOF) model and nonlinear tire model, sideslip angle-sideslip angular velocity ([Formula: see text]) phase plane established. Then, dataset made influence speed, adhesion coefficient, front wheel angle. To get driving region, a...

Spatial object matching is one of the fundamental technologies used for updating and merging spatial data. This study focused mainly on optimization multiscale polygonal objects. We proposed a granularity factor evaluation index that was developed to promote recognition ability complex matches in matching. Moreover, we designed model based backpropagation neural network (BPNN) multistage workflow. Our approach validated experimentally using two topographical datasets at different scales:...

The group delay characteristics of the reflection coefficient for circuit design are introduced. waveguide filter is simulated with as target. Due to symmetry filter, simulation parameters halved. After obtaining initial optimization curve, space mapping algorithm applied optimization. Finally, a 5-pole Chebyshev bandpass has been successfully designed according proposed method.

In geotechnical engineering, the mechanical behavior of rocks under various In-situ conditions (stress state including axial stress, confining pressure, pore water pressure) have always been an important topic. Therefore, pressure effect on permeability and different size sandstone samples a certain condition was studied. The sizes shows roughly same exponential de-creasing law with increase pressure. test, both loading Young?s modulus E+ unloading E- increased continuously increasing while...

Abstract Aiming at the problem of unmanned aerial vehicle (UAV) attitude control with insufficient robustness and anti-disturbance, this paper proposes a UAV method combining incremental nonlinear dynamic inverse (INDI) neural network (NN) adaptive compensation. Firstly, model time scale separation is proposed. On basis, INDI law derived, angular acceleration information required by feedback filter. Then, NN compensation structure introduced to eliminate uncertainty caused mismatch, sensor...

The self‐stability height of the foundation pit sidewall is an important criterion for evaluating safety degree and designing supporting structure. strength reduction elastic‐plastic finite element numerical calculation method has been adopted in this paper. Based on comparative analysis stability characteristics deep binary strata upper soil lower rock under multiple working conditions, potential fracture surface evolution law corresponding factor have revealed different Hs H . A new idea...

In order to improve the control effect of main steam temperature with large time delay, this paper proposed a delay separated neural network inverse (DSNNI) scheme. The and positive model without were given by using adaptive linear element BP network. was built   on that basis. An appropriate reference selected make model’s output smoothing. It is an open-loop system when cascaded into original system. will avoid instability caused closed-loop systems. Off-line identification on-line are...