Three-phase pulsewidth modulation inverter fed induction motor drive system is widely applied in high power applications. Sensor faults are very common the system, which, once occur, might result degraded performance or even shutdown. In order to rapidly and accurately diagnose sensor faults, this paper proposes an intelligent time-adaptive data-driven method identify fault location type of sensors system. An emerging machine learning technology named extreme (ELM) learn dataset; ensemble...

Active damping is a common way to stabilize the current control of LCL-filtered converters. In this paper, stable region -180° phase crossing first identified within predefined range grid impedance and LCL parameter variations. Once loop in region, stabilization can be attained. Subsequently, digital filters adopted achieve active by reshaping open-loop phase. Various are selected benchmarked paper. It confirmed that all-pass filter has unity gain adjustable lagging before Nyquist frequency,...

This article presents a non-linear output feedback tracking controller deisgn for autonomous underwater vehicles (AUVs) operating in shallow water area. In environment, significant disturbances due to waves affect the motion of marine greatly. Since it is not energy efficient counteract oscillatory waves, critical obtain wave information or induced disturbance and design an reduce action actuators avoid wear tear on actuators. this article, observer first designed estimate low frequency (LF)...

Abstract In this paper, we consider the problem of autonomous underwater vehicle (AUV) station keeping (SK) in shallow water area. During SK, an AUV is required to maintain position and orientation with respect a fixed reference point at sea floor. When operates water, high‐frequency disturbances due waves will significantly affect motion AUV. order derive wave disturbance information for control purposes, nonlinear observer first designed estimate velocities relative by using attitude...

When the vibration of diesel engine structure is measured, signal composed a very complex superposition contributions different vibratory sources modified by their respective transmission paths. These originate from several internal phenomenon in such as combustion pressure variation, unbalanced reciprocating and rotating parts. In engine, movement parts work specific order. Once starting point determined, occurrence order cycle phases can be determined. This could successfully use to...

The purpose of this study is to investigate the characteristics vibration isolation system with a single degree-of-freedom (SDOF) and two-degree-of-freedom (2DOF) respectively based on high-static-low-dynamic-stiffness (HSLDS). This model consists simple configuration connecting vertical spring pair oblique springs. restoring force approximated linear cubic stiffness by applying Maclaurin series expansion. dynamic equations SDOF 2DOF are established for harmonic excitation....

A novel quasi-zero stiffness nonlinear magnetic isolator is designed by using springs in parallel with linear positive spring. Through the static analysis, mathematical expressions of force-displacement-current and stiffness-displacement-current system are established, necessary conditions for normal function geometric parameters obtained. The dynamic equations under external excitation force established. amplitude frequency characteristics deduced harmonic balance method. influence on...

The leakage of water supply pipeline is a common problem in the world. Timely discovery and treatment can avoid drinking pollution, save resources or road collapse accidents. Therefore, it great practical significance to study leak detection methods. In this experiment, piezoelectric acceleration sensors were placed different locations pipe acquire signals. According generation mechanism acoustic signals, unpredictability characteristics signal are investigated. autocorrelation function used...

This paper presents a passive nonlinear observer for station keeping of autonomous underwater vehicles (AUV) operating in shallow water area. Station is the ability vehicle to maintain position and orientation with regard reference object. The used estimate wave velocity. shown be globally exponentially stable. has been illustrated using an AUV simulation shows good performance observer.

Lithium-ion batteries (LIBs) have been widely applied in energy storage system, and its prognostics health management are of great importance for the system performance. In this paper, an ensemble data-driven method is proposed to accurately predict remaining useful life (RUL) lithium-ion batteries. A strongly related feature extracted from charging voltage selected indicate degradation trend battery, according Pearson correlation analysis. random learning algorithm named Random Vector...

An adaptive observer for tracking control of autonomous underwater vehicles (AUVs) operating in shallow water area is designed. In environment, significant disturbance due to wave motion present which affects the position a marine vehicle. Since it not energy efficient counteract oscillatory waves, critical estimate such disturbances and remove from feedback loop so that wear tear on thrusters are minimized. this paper, an designed low frequency by using heading measurement concerning...

This paper presents the design of a nonlinear controller for tracking control spherical autonomous underwater vehicle (AUV), named as Omni-Directional Intelligent Navigator (ODIN) operating in shallow water area. When AUV operates environment, significant disturbance due to wave motion will be introduced into position and heading marine vehicles. It is critical obtain knowledge information or induced reduce reaction this motion. In paper, an observer designed estimate motion, low frequency...

This paper builds up supply chain synergy marketing game model based on retailer investment level and manufactory level, applying the theory to analyze methods of under different structure markets, It is discussed related factor which mode influenced profits studied found out superior acceptable pareto-optimal solution both retailer.

Supply chain simulation is always an important subject in recent years. According to the deficiency of research on capability limit, this paper simulates supply through system dynamics method order bring forward some valuable viewpoints. Firstly, limit can have great influence operation chain. Secondly, effects caused by may disappear when threshold arrives. Thirdly, profits maybe be produced with improvement under threshold, such as transporting ability and a difficult problem, exact value...

Active damping is a common way to stabilize the current control of LCL-filtered inverter systems. In this paper, active realized with digital filters reshape open-loop phase response, where no additional sensors are required. A safety region -180°-phase crossing first identified within predefined range grid impedance changes and LCL parameter variations. Once loop reshaped region, stable can be ensured. Different selected for comparison, which shows that allpass filter has unit gain...

The most significant difference between the ac-exited generator and traditional synchronous is adjustable speed. A detail analysis of static state stability ac-excited present. limit not only by as machine but also breakdown torque asynchronous machine. relation limits rotor speed derived from mathematic model, thereby law at any presented these have been tested dynamic physical simulative experiment.

Based on the load data of Tianjin, paper analyzes power grid characteristic curves, and discusses influence factors. Firstly, focus current situation development characteristics consumption structure are based supply demand, structure, industrial structure. Secondly, annual Tianjin grid, including characteristics, typical daily characteristics. Finally, main factors influencing grid.