122 research outputs found

    Propulsion IVHM Technology Experiment

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    The Propulsion IVHM Technology Experiment (PITEX) successfully demonstrated real-time fault detection and isolation of a virtual reusable launch vehicle (RLV) main propulsion system (MPS). Specifically, the PITEX research project developed and applied a model-based diagnostic system for the MPS of the X-34 RLV, a space-launch technology demonstrator. The demonstration was simulation-based using detailed models of the propulsion subsystem to generate nominal and failure scenarios during captive carry, which is the most safety-critical portion of the X-34 flight. Since no system-level testing of the X-34 Main Propulsion System (MPS) was performed, these simulated data were used to verify and validate the software system. Advanced diagnostic and signal processing algorithms were developed and tested in real time on flight-like hardware. In an attempt to expose potential performance problems, the PITEX diagnostic system was subjected to numerous realistic effects in the simulated data including noise, sensor resolution, command/valve talkback information, and nominal build variations. In all cases, the PITEX system performed as required. The research demonstrated potential benefits of model-based diagnostics, defined performance metrics required to evaluate the diagnostic system, and studied the impact of real-world challenges encountered when monitoring propulsion subsystems

    Prototype of a GBAS ground station. Implementation of the differential corrections according to CAT I MOPS ED-114

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    The accuracy that GNSS and GBAS can provide is the key to improve air traffic where bottlenecks appear: terminal areas surrounding main airports. Its implementation would represent lower budgets in cost and maintenance in comparison to current guidance systems that would remain as backup. This project focuses on processing raw satellite data and producing a standard output to increase air traffic navigation, approach and landing capacities in terminal areas. This involves tasks such as algorithm prototyping in Matlab and -integrity monitoring testing- with bad ephemeris data to check the output response. The impact of known errors will be analyzed to obtain a robust and scalable system. The next step will be the GBAS message codification and generation (Type 1) for a GBAS station. This station will be made up of four reference receivers located in the proximity of airport's Runways to accomplish CAT (I) requirements and provide the best measurements in approach and landing maneuvers. The project is located in the base of an ambitious bigger scheme (CATGOS) under development by Indra, which aims to implement and certificate a GBAS station for an airport environment in a four-year prospect

    Измерительный комплекс дециметрового диапазона для диагностики условий распространения радиоволн в атмосфере

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    Разработан измерительный комплекс на базе приёмного модуля Trimble Copernicus II. Данный приемник работает на частоте 1575 МГц и имеет 12 каналов для непрерывного слежения за спутниками. Измерительный комплекс позволяет получать первичные данные, характеризующие канал связи спутник – GPS приёмник. Комплекс обладает высокими техническими характеристиками и имеет сравнительно небольшую стоимость.The measuring system, based on the receiver module Trimble Copernicus II was developed. The operation frequency of GPS receiver is 1575 MHz. The presented receiver has 12 independent channels for continuous satellites tracking. The raw data, obtained by GPS receiver allows evaluation of physical properties of communications channel GPS satellite – Earth. The measuring complex is cost effective and has high technical characteristics

    Design of a Control System for an Elbow Joint Motion Simulator

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    An elbow joint motion simulator provides the ability to derive various measures from cadaveric elbow specimens such as the kinematic effects of radial head prostheses and ligament strains. To ensure that the data collected is meaningful, the system must be able actuate the elbow through chosen displacements in a repeatable manner. A control system is developed in this thesis capable of performing this task. Linear positioners which create motion by applying loads through the brachialis, triceps, biceps, and pronator teres move the arm through flexion / extension or pronation / supination movements. Sensors measure loading and displacement states enabling the use of proportional-integral-derivative feedback control. Results indicate the system's capability. Suggestions for future work are given

    Genome-wide association study for type 2 diabetes in Indians identifies a new susceptibility locus at 2q21.

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    Indians undergoing socioeconomic and lifestyle transitions will be maximally affected by epidemic of type 2 diabetes (T2D). We conducted a two-stage genome-wide association study of T2D in 12,535 Indians, a less explored but high-risk group. We identified a new type 2 diabetes-associated locus at 2q21, with the lead signal being rs6723108 (odds ratio 1.31; P = 3.32 × 10⁻⁹). Imputation analysis refined the signal to rs998451 (odds ratio 1.56; P = 6.3 × 10⁻¹²) within TMEM163 that encodes a probable vesicular transporter in nerve terminals. TMEM163 variants also showed association with decreased fasting plasma insulin and homeostatic model assessment of insulin resistance, indicating a plausible effect through impaired insulin secretion. The 2q21 region also harbors RAB3GAP1 and ACMSD; those are involved in neurologic disorders. Forty-nine of 56 previously reported signals showed consistency in direction with similar effect sizes in Indians and previous studies, and 25 of them were also associated (P < 0.05). Known loci and the newly identified 2q21 locus altogether explained 7.65% variance in the risk of T2D in Indians. Our study suggests that common susceptibility variants for T2D are largely the same across populations, but also reveals a population-specific locus and provides further insights into genetic architecture and etiology of T2D