Generally, multiple risk factors are involved in tunnel construction accidents. Therefore, it is of particular importance to evaluate the mechanisms multifactor risks and measure coupling safety. Tunnel components under complex geology were investigated using 101 accidents as examples. N-K degree models introduced for analyses calculate degrees each component single-factor two-factor models, respectively. Meanwhile, correlation mechanism between value was analyzed. The obtained results...

Abstract With the rapid development of self‐powered electronics such as wearables, implantable devices, and sensor networks, there is an increasing demand for power sources that have a high density long lifespan to keep entire system operational. Flexible piezoelectric materials with capability mechanical‐to‐electrical energy conversion attracted significant interest because their immense potential harvesting human biomechanical energy. Herein, 3 mol.% yttrium stabilized zirconia ribbon...

To address the stability issues of energy and information transmission in wireless power transfer system operating over a wide temperature range, this paper establishes mathematical model resonant frequency an electromagnetic coupling under varying conditions. Simulations experiments are conducted to analyze impact on resonance characteristics. The results show that within range −40 °C 50 °C, deviation leads reduction coefficient 35.93%. mitigate issue, real-time compensation method based...

Multiple dynamic impact signals are widely used in many engineering scenarios. In the process of penetrating multilayer hard targets, overload from multiple impacts difficult to identify due "signal adhesion" problems caused by nonlinear strong disturbances. For this problem, a customized lightweight neural network framework is proposed here. First, characteristics and their disturbances analyzed dynamics modeling continuous wavelet transform. Second, considering these with SqueezeNet,...

In this study, the authors propose a novel circuit topology based on current non-linear parity-time (PT)-symmetry principle. The exact analytical solutions of transfer efficiency and resonant frequency are deduced, state switching phenomenon is observed, mathematical expression critical coupling coefficient (κc ) corresponding to point provided. When (κ) ≥κc , system has two real frequencies can maintain near 100% theoretically. κ < κc only one frequency, attenuates rapidly. correctness...

The nonlinear parity-time-symmetric wireless power transfer (NPTS-WPT) system is more robust against distance than the traditional WPT system. Current studies mainly focus on situation in which transmitter (Tx) and receiver (Rx) are completely matched. Our study focuses characteristics of NPTS-WPT under detuning between Tx Rx. First, mathematical model detuned established, then solved using Shengjin’s formula. Then, exact analytical solutions for operating frequency, amplification factor...

Temperature and humidity monitoring system is an important part of laboratories, such as scientific experiment laboratory quality testing laboratory. In order to supervise record the temperature geographical distributed constant Laboratories, a web-based developed. The consisted local data acquisition hardware remote database management software. made up sensors arranged in central control set, which controlled by MCU takes charge collecting from transmitting them server. Application shows...

In this paper, an optimal-damage-effectiveness cooperative-control strategy based on a damage-efficiency model and virtual-force method is proposed to solve the pursuit-evasion problem with multiple guided missiles. Firstly, different from overly ideal assumption in traditional problem, optimization that maximizes damage efficiency established solved, making more meaningful for practical applications. Secondly, modified obtain control strategy, which solves numerical solution challenges...

A small-size wireless data acquisition system is developed for the application where common cable-necessary inapplicable. The paper describes design Issues and implementation of system, especially on how to improve reliability reduce volume. Questions noise interference restraint are also discussed. in practical experiments has shown that it satisfies signal from rapidly revolving object. Besides, small volume makes ideal space-critical measurement applications.

Abstract A fully functional, safe and stable electric vehicle charging pile is a necessary condition to ensure the widespread promotion of vehicles. At present, due lack testing methods, large number manufacturers have not performed systematic test on their piles before leaving factory. These defects make real availability put into operation in market very low, it difficult meet needs charged cars. To solve this problem, research chooses develop simulation platform for control system based...

A trajectory‐corrected rocket projectile with an isolated rotating tail rudder provides a new concept for low‐cost trajectory correction and guidance due to its simplified principle. To study the angular motion characteristics of under action periodic control force, differential equation described in complex plane is derived based on rigid body equation. Furthermore, effects initial conditions, gravity, asymmetric flight stability uncorrected state are studied. The critical rotational speed...

In this study, a low-cost two-dimensional (2D) trajectory correction mechanism is proposed to address the large deviation of small-caliber extended-range ammunitions. By controlling projectile’s roll, single-channel 2D function can be realized. Moreover, based on ideal trajectory, five-degree-of-freedom approximate rigid-body equation proposed. A high-order system transformed into two low-order cascading subsystems using fuzzy control and self-disturbance rejection theory, which reduces...

For the real-time information communication of fuze and fire control system, a wire link setting technology is adopted to realize dual-direction quick transmission between system circuit. In order reduce energy consumption circuit during feedback process, loop designed based on load modulation with function through analysis equivalent The data encoding format form frame data. etc are also discussed here. Finally, experiments carried verify feasibility reliability program.

In order to obtain the three-dimensional position of target, and then measure trajectory moving problem target recognition positioning based on binocular stereo vision is studied. A system built MATLAB software used complete calibration system. Through checkerboard method, internal external para-meters, relative attitude distortion parameters left right cameras are obtained. matching stage, image preprocessed first, RANSAC algorithm eliminate mismatch, SIFT SURF feature algorithms match...

In order to solve the problems of automatization and low efficiency in circuit test trial product a certain type fuze scientific research stage, as well application requirements batch testing later production multi-channel parallel system based on 485 bus was designed. The can realize 100 circuits at time, premise ensuring accuracy, automation degree are improved.

Abstract In the traditional analysis of angular motion a projectile, coefficient freezing method is often used to simplify differential equation motion. However, this gives poor approximation for long time scales. paper, based on Lyapunov artificial-small-parameter perturbation theory, an asymptotic analytical solution projectile derived by constructing artificial small parameters variable terms in original equation. example, single-channel rotating with two-dimensional trajectory correction...

At present, the number of charging piles is increasing and distribution position discrete. It difficult to manage maintain after being put into use. For abnormal work caused by software operation problem in pile, this paper proposes a remote monitoring mode method. By information analyze problems that occur during operation, it easy reduce operating costs. According hardware architecture article takes event as object, records log according time occurrence uploads background. The content...

In the combat environment, effective detection of target position is one important contents precision guided munition research. Under action geomagnetic field, magnetic field distortion will be generated around ferromagnetic metal target. Based on this phenomenon, paper models and simulates ground targets, analyzes characteristics target, summarizes its location The correlation law of, provides data basis for subsequent orientation recognition. Recognizing based can promote timely adjustment...

With charging piles being listed as one of the "new infrastructure construction", a construction boom has been set off across country. At present, it is showing large number and wide distribution. How to effectively manage become an urgent problem for industry. In this regard, article proposes remote maintenance management system piles. Maintenance personnel can access web platform through browser understand operating status The implementation based on B/S architecture adopts Django...