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Vibration and noise is an important factor to restrict the development and application of reactor. A weak 3D magneto-elastic model including magnetostriction and damping effects is developed in this paper. The magnetic field is analyzed based on field-circuit coupling, and then the vibration due to electromagnetic forces is analyzed of dry type reactor under different control currents. The electromagnetic...
Noise suppression is one of the key issues to be solved in the design and application of the motor. Especially in larger motors, noise and vibration caused by the magnetostrictive effect of silicon steel accounted for a large proportion of the motor noise. This paper focuses on how to solve the problem of motor noise and vibration suppression caused by the magnetostrictive effect of silicon steel,...
In order to address the short distance transmission of inductive coupling wireless power transmission and the poor stability of power supply of near-field resonant wireless power transmission, achieving high-power, efficient and stable wireless power supply for dynamic load on meter level, the cooperative operating mode with tight-strong coupling is proposed and analysed. By establishing unified mathematical...
To achieve the wire-landing and wire-walking inspection of the unmanned aerial vehicle (UAV) for power line inspection, a binocular vision was developed based auxiliary navigation system on the embedded development platform. Based on the specific imaging target, line laser is shine on the power system wire, making it a cooperative target to assist the landing of UAV. During the course of UAV flight,...
In the MANETs (Mobile Ad Hoc Networks), attack detection in Location Aided Routing (LAR) has become a challenging problem due to the dynamic network topology and diverse routing attacks. This paper proposes a universal framework to analyze and detect attack traces for various potential attack targets. In this framework, the attack targets are identified by matching key events, and a reverse search...
Electromagnetic (EM) inverse problems are usually modeled as simulation-based optimization problems with multimodal and non-differentiable properties. These properties justify the invention of more effective optimization algorithms. Artificial bee colony (ABC) has already been applied to tackle EM inverse problems. This paper applies a tree structure to record all search moves of ABC. A history based...
The development of high voltage technology provides technical conditions for the transmission of offshore new energy, but it is necessary to consider the operation status of power grid when we decide the way of grid connection. This paper focuses on the stability of the system and evaluates three access form — the high voltage alternating current (HVAC), traditional direct current (DC) and flexible...
The “Regulation on the Emergency Response, Investigation and Handling of Electric Power Security Accidents”, based on load-shedding proportion, namely the Decree No.599 of the State Council of the People's Republic of China, was implemented on September 1st, 2011, which proposed new more stringent requests for power system reliability and security. Combining with related regulations on the Decree...
We demonstrate a strictly all-polarization maintaining, all-fiber chirped pulse amplification of ultrashort pulses. Pulses with the duration of 933 fs and energy as high as 50 μJ are achieved at 200 kHz repetition rate in a compact size. The variations of the spectra and pulse widths as functions of the amplified output power have also been presented. To our best knowledge, this is the highest energy...
Offloading the LTE data services to unlicensed spectrum has been considered by 3GPP in Release 13, which is defined as LAA (Licensed-Assisted Access). Unlicensed band is attractive because of its large amount of spectrum resource. However, coexisting with wireless devices already existing in unlicensed spectrum (such as Wi-Fi) is a primary issue be solved effectively. This paper proposed two dynamic...
This paper provides a substation live working robot system, which consists of mobile insulation lift platform, six degree of freedom hydraulic manipulator, master control system and live working tools. It can assist or replace the manual to complete some special live-working, such as insulator cleaning, RTV spraying, Insulator detection, Nitrogen flushing. The successful application of the robot provides...
Substation insulator strings which exposed to the outdoor environment need to be cleaned the industrial contamination and natural contamination regularly in order to prevent the flashover phenomenon that occurs in rain and fog and other inclement weather because of the accumulation of contamination and then cause power outages and other incidents. The Substation Charged Maintenance Robot is used for...
new device for hot-line sweeping of post insulators in substations is introduced. The installation is composed of a sweeping actuator, an insulated transmission mechanism, a steering mechanism, a hydraulic driving device, anti dropping device, hydraulic mechanical arm, telescopic arm and a moving chassis insulation‥ And can complete the sweeping work of insulator under the condition of hot-line.
In order to study the impact of fluctuant characteristic on target detection, a more accurate RCS fluctuant statistical model for a typical target is established and applied based on the fluctuation factor. Firstly, the dynamic RCS data were gained based on quasi-static method. Secondly, the optimal fluctuation factor was attained after fitted with Chi-square distribution based on the principle of...
Traditional low-refraction-index devices are usually supported by a pedestals, introducing an extra air layer compared with real on-chip devices, which cannot meet the demand of optical interconnection. In this work, we proposed and experimentally demonstrated silica microtoroids bonded on high-refractive-index silicon substrate realizing good light confinement [1]. With proper microtoroid minor diameter,...
Remaining useful life (RUL) has been attached great importance for the health management of stochastic degrading systems. However, current studies place main focus on continuous degradation processes of systems without the consideration of randomly arriving shocks from changes in inner conditions or external environments. In this paper, we present a new prognostic model to characterize the continuous...
Degradation-modeling based prognostic approach has been proved as an effective alternative to the conventional lifetime-data dependent residual life prediction method, and thus draw much attention of both scholars and engineers in the field of reliability. The degradation process of a system is the result of interaction between its inner states and working environments. To provide a reasonable reference...
State-space model is often used to estimate system degradation. However, the state-space model is usually only one observation equation in existing research, and it only applies to one observation indicator. This paper puts forward an adaptive state-space model, which can be applied to multiple observation indicators. The modeling method and parameter estimation approach of adaptive state-space model...
Smart video surveillance systems are essentials in modern environments to ensure safety and security for lives and property. In order to capture critical clues of reconnaissance, it is important to automatically and dynamically control the surveillance sensitivity and quality for detecting abnormal/suspicious events to perform high quality monitoring. In this work, we design a smart video surveillance...
Planetary gears have been widely used in transmission systems of helicopters, wind turbines and mine machineries, etc., due to their advantages on large ratio of transmission, high efficiency, compact structure. However, it is very difficult to detect faults of planetary gears, especially when multi-fault happens because of structure complexity. Prognostic and Health Management (PHM) is recognized...
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