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With miniaturization development of switching mode power supply, electro-thermal interaction inside the power supply cannot be ignored. Realization of electro-thermal coupling simulation involves multiple software interfaces and automatic calling. There is a lack of usable integrated software platform at present, which has restricted application of electro-thermal coupling in switching mode power...
Research on anti-interference capability of electromagnetic relay under electromagnetic pulse (EMP) is very important for assuring its reliable operation. In this paper, equivalent circuit of the relay was obtained, considering parasitic capacitance, inductance and resistance of electromagnetic system and contact system. The equivalent circuit is applied in a certain relay to analyze how the EMP interferes...
Airport Lighting Aid is important for guaranteeing safety of planes' take-off and landing. This paper mainly analyzed the reliability of Airport Lighting System when light source fails. With the data obtained from airfield lighting station in an Airport in China, this paper predicted the reliability of every subsidiary system, built up the fault tree and calculated the reliability of airport lighting...
In this paper, numerical simulation was performed on the through-hole solder joints of a LED driver, and reliability analysis was carried out. Taking the simulation speed and time into account, firstly the thermal field of the LED driver was simulated, which was then verified by infrared thermograph. Then the thermal-stress simulation was conducted on the solder joints which were of the highest temperature...
High-frequency relays, which could transmit the radio frequency signals without distortion and cut off the signals reliably, are widely applied in the fields of the industry, military and aerospace. The continuous and discontinuous structure on the signal transmission path is the main limit of the radio frequency (RF) performance of the relay. In this paper, a certain type of high-frequency relay...
Calculation of contact resistance is closely related to the accuracy of switches' thermal simulation, though this issue is still in lack of effective method until now. This paper presented a new method for accurate acquirement of contact resistance and temperature rise based on rough surface contact model and finite element simulation. The relation between contact resistance and contact force was...
Electromagnetic relay (EMR) is a kind of high failure rate component in control system, the accuracy of its reliability prediction plays a significant role in the system reliability estimation. Currently, post-analysis methods didn't consider the influence of different application environment of EMR, only using some coefficients to revise the prediction results. In fact, the failure process and failure...
The permanent magnet (PM) is the key part of the relay. This paper aims to solve the problem of the uneven magnetization for the PM with nonlinear demagnetization curve after magnetizing and demagnetizing. A method partitioning the PM along the magnetization direction and the vertical direction of magnetization according to the condition of the specific magnetization of the PM was presented. By this...
Working characteristic of the permanent magnet (PM) is a key point of PM relays design. Soft magnetic material and coil will effect the working characteristic of PM. In order to analyze the effect of coil, a combined three-subsection PM in close magnetic circuit model (CTPMC) is built based on the equivalent magnetic circuit, and its theoretical model is established under the magnetic potential effect...
The values of analog circuits' input and output signals and the component parameters are continuous, and meanwhile there are inevitable tolerance and non-linear components in analog circuits, therefore the presence of these factors increases complexity of the analog circuits fault diagnosis. RBF and BP neural network are two widely used feedforward neural networks, LabVIEW is a graphical programming...
Time parameters of electromagnetic relay used in aerospace such as the bound time, the arcing time, the over-travel time and the stability time can effectively describe the contact reliability. So these parameters should be carefully measured and checked before the relay is used. There are many devices which can test a series of time parameters at present time. But none of them can measure the stability...
The traditional reliability assessment methods for electromagnetic relay (EMR) are based on censored failure-time data, which provides very little reliability information. Furthermore, this method may be unavailable in applications with few or no failures. Actually, many time parameters of electromagnetic relay, such as closing time, over-travel time provide an obvious degradation process during the...
Surface wave is widely used to detect and locate the surface and sub-surface defects. A model has been developed for the calculation of surface wave generated by an electromagnetic acoustic transducer (EMAT) operating on the Lorentz principle by finite element method. We establish the displacement model of surface wave based on acoustic theory in elastic solids. The surface wave is measured by a Michelson...
As a result of the development of higher speeds and heavier loads of rail networks, rail defects have been more serious than ever before. Current piezoelectric ultrasonic detection devices are often inadequate for rail inspection, due to high misjudgement or undetected error rate, and complex structure. This paper introduces a novel rail detection system. The system is based on multi-channel electromagnetic...
The DC switch is widely used in the railway locomotive system. Electrical arc erosion generated when the switch is operated is the primary factor that affects the life-span of high-power switch, which is harmful to the reliability of the whole system. In this paper, a whole new design method is proposed for the DC 110V/250A hybrid switch which is composed of the power electronic switch, the storage...
The vibration performance of hermetically sealed electromagnetic relay which contains armature system is an important element when we judge the reliability of apparatus. A nonlinear single-degree-of-freedom mathematic model considering contact loss was built in this paper, and the dynamic behavior of armature subjected to external Gaussian white noise excitation was investigated by using Fokker-Planck...
Hermetically sealed structure is the optimal style to protect electromagnetic relay (EMR) from formidable working environment. Each product shall be subjected to thermal environment shock in accordance with MIL-STD-202 from -65degC to +125degC temperature, so it is of great importance for thermal analysis of EMR to increase the thermal stability and reliability requirement. In this paper, special...
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