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Thermal cyclic test is very important for astronautic electronic products to stimulate potentially critical failures and eliminate latent defects. The design of the thermal cyclic test should take the safety of test into account to avoid over-test risks. Over-test risks can cause serious consequences, such as unnecessary life cycle consumption and products failure. A method presented in this paper...
An analytical large signal model based on semi-empirical formulas is presented for describing the DC characterization of GaAs Pseudomorphic High Electron Mobility Transistor (pHEMT), which included pad capacitances, intrinsic elements and extrinsic elements is in good agreement with the theoretical results obtained by performing device simulation. The accurate temperature rise in the GaAs pHEMT's...
Failure investigation is carried out on the adhesive joint of microwave ferrite phase shifter. Though, practically, the failure mode of microwave ferrite phase shifter can be described as the fracture of adhesive joint between ferrite and microwave dielectric ceramic, the failures of adhesive layer could be found in various ways and at various stages of manufacture, assembly and service. They may...
The Prognostics and Health Management (PHM) system for radar equipment is paid more and more attention by researchers in recent years. Owing to its high reliability and performance, the Active Phased Array Radar (APAR) has been playing an increasingly important role in the modern radar field which is composed of thousands of solid-state Transmit/Receive (T/R) modules. As the power source of the T/R...
It's essential to identify the vital parts at the blue-print stage of electronic products before the engineers scheme out any method of product fault prognostication and health management. Currently, the vital parts, which are expensive, fragile, or with complex and critical functions, can be confirmed through experience, field data or FMEA method. This paper presents a new method to provide a list...
An avionic illumination power supply unit and its modified type are selected as the case study in this paper to discuss the data sufficiency of the result given by Physics of Failure method. Comparing the using information obtained from field operation with the failure data, which is predicted under the help of physics of failure method, the sufficient level of the failure data can be evaluated in...
Avionic equipments, which are vulnerable to airborne radar, radio and other sources of human disturbance, always work in complex electromagnetic environment. Therefore, the structure level segregation and protection methods are significant. However, the thermal pathway of avionic equipments with high power losses can be prolonged by electromagnetic compatibility measures inevitably because of the...
To save the weight and volume of the bracket, the avionic devices are sometimes fixed onto the airframe from outside directly in the design of air craft with small dimension, which will always lead to an abnormal geometry of the avionic device's case and rearranging of the circuit board assemblies (CBAs), to achieve the aerodynamics goal. However, the inner environment and the air flow outside the...
Aiming at the problem that traditional regression analysis can not reflect the randomness of performance degradation, which happened in the process of statistical analysis of component accelerated storage degradation test, the performance degradation process of the continuous cumulative damage degradation failure component is described by the stochastic process method. The component storage reliability...
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