In this paper, we investigate the precoder design for multiple-input multiple-output (MIMO) dual-functional radar-communication (DFRC) system with one-bit digital-to-analog converters (DACs). order to form beam-pattern, formulate precoding problem as a weighted optimization constant modulus constraint, which aims at minimizing average error power and guaranteeing radar waveform similarity. The is divided into three sub-problems corresponding multiple variables, i.e., factor, transmit signal...

Abstract The use of changes in dynamically measured flexibility matrices to detect structural damage has received considerable attention during the last years. A new flexibility‐based method is proposed this study provide an insight characterizations damage. presented makes eigenparameter decomposition change and approaches identification problem a decoupled manner. First, theory developed determine number damaged elements according non‐zero eigenvalues change. With determined, localization...

The dual-functional radar communication (DFRC) has been regarded as one of the most attractive solutions for facilitating vehicle applications in internet vehicles (IoV) by utilizing millimeter Wave (mmWave) and massive multiple-in-multiple-out (MIMO) technologies. In this paper, we propose a hybrid beamforming (HBF) scheme with low power consumption fully directional gains. proposed HBF integrates digital (DBF) analog (ABF) to adopt connected (F-C) structure realize high spectral efficiency...

Abstract A modified variational iteration method (MVIM) is proposed for nonlinear oscillators. Different from the existing VIM, algebraic equation deduced at each stage always linear when approach applied to conservative Therefore, highly accurate approximations can be easily obtained. The Duffing and van der Pol equations are presented validate MVIM. Numerical examples show that valid both weakly strongly In addition, it reveals MVIM equivalent a Mickens scheme. Furthermore, extended by...

Structural damage detection using measured response data has emerged as a new research area in civil, mechanical, and aerospace engineering communities recent years. In this paper, universal fast algorithm is presented for sensitivity-based structural detection, which can quickly improve the calculation accuracy of existing technique without any high-order sensitivity analysis or multi-iterations. The key formula derived from stiffness flexibility matrix spectral decomposition theory. With...

Summary In this paper, a new discrete elements generation method based on geometry is proposed to fill geometric domains with particles (disks or spheres). By generating each one random radius calculated from the iteration ensure no overlaps exist between and identifying unstable changing them stable ones, dense packing can be created. A partitioning particle interval stability inspection improvement are introduced guarantee algorithm's success of particles. Some packings were created...

Structural damage identification using ambient vibration modes has become a very important research area in recent years. The main issue surrounding the use of is mass normalization measured mode shapes. This paper presents promising approach that extends flexibility sensitivity technique to tackle case. By introducing factors, manipulating equation, unknown parameters and factors can be computed simultaneously by least-square technique. effectiveness proposed method illustrated simulated...

Background: Damage identification at the earliest possible stage is very important for beam structures to ensure safety, extend serviceability, and reduce maintenance costs according recent patents. Methods: The goal of this work develop a virtual load method damage by using only vibration modes current structure. Central approach construction support conditions A quasistatic deformation structure can be obtained multiplying its modal flexibility matrix with force vector. And then location...

Abstract In view of the large computational complexity and poor real-time performance l 1 norm convex optimization process for DOA estimation based on compressed sensing sparse reconstruction, SAMP greedy algorithm is used to replace obtain approximate solution 0 in estimation. The array manifold matrix divided by equal sinusoidal, which satisfies MIP criterion better. An iterative regularization sparsity adaptive matching pursuit (IR-SAMP) proposed, makes better signal reduces error....

Abstract Single-atom catalysts (SACs) have emerged as efficient oxidant activation materials, yielding highly reactive species in organic wastewater decontamination. However, the fundamental studies on single metal sites are susceptible to insufficient electron input and instability. Herein, we first used theoretical calculations predict optimal locations of nitrogen vacancy Fe single-atom also revealed that dual could significantly enhance light absorption, charge separation, transfer....

Using the static displacement data, this paper presented a damage assessment method for awning beam. This is based on estimation of changes in structure. The most significant advantage that it does not require development an analytical model structure being tested. All predictions are made directly from measurements taken efficiency proposed demonstrated using simulated data with measurement noise results showed point which difference starts increasing linearly location Regardless damages...

A new method based on best achievable flexibility change is presented in this study for structural damage localization. The algorithm makes use of an existing finite element model the "healthy" structure and a subset experimentally measured modal parameters "damaged" structure. Central to localization approach computation Euclidean distances between changes. location can be identified by searching value that considerably smaller than others these distances. numerical example spring-mass...

Structural damage identification using ambient vibration modes has become a very important research area in recent years. The main issue surrounding the use of is mass normalization measured mode shapes. This paper presents promising approach that extends flexibility sensitivity technique to tackle case. By introducing factors, manipulating equation, unknown parameters and factors can be computed simultaneously by least-square technique. effectiveness proposed method illustrated simulated...