In this paper, an adaptive sparse arbitrary polynomial chaos expansion (PCE) is first proposed to quantify the performance impact of realistic multi-dimensional manufacturing uncertainties. The Stieltjes algorithm employed generate PCE basis functions concerning geometric variations with distributions. basis-adaptive Bayesian compressive sensing introduced retain a small number significant functions, requiring fewer model training samples while preserving fitting accuracy. Second, several...

Idlers are typical rotating parts of a belt conveyor carrying the and materials. The complex operating noise unstable features lead to poor accuracy sound-based idler fault diagnosis. This paper proposes diagnosis method for idlers based on Transformer’s dynamic self-attention (DSA). Firstly, A-weighted time-frequency spectrum sound is extracted as input. Secondly, DSA block, multi-frequency cross-correlation algorithm designed extract between different frequency bands in input feature map,...

Compressed air energy storage systems must promptly adapt to power network demand fluctuations, necessitating a high surge margin in the compression system ensure safety. It is challenging completely eliminate blade geometric variations caused by limited machining precision, important effects of which should be considered during aerodynamic shape design and production inspection. The present paper explores uncertainty impact deviations on stability multi-stage axial compressor at low...

The measurement of gas pressure with low detection limit is great significance and remain challenging. In this work, a sensing system proposed based on Fabry-Perot interferometer intracavity fiber ring laser. A miniature pressure-sensitive fiber-optic fabricated polyimide film by 3D printed resin shell. Then, it coupled in reflection loss the modulated at different pressures. With induced, can be measured output power has been greatly optimized from 0.155 KPa to 0.01 KPa. temperature...

The impact of geometric deviation due to manufacturing on compressor performance is considerable in engineering practice. To investigate the blade thickness and flow loss at various rotational speeds, a three-dimensional steady numerical simulation Rotor 37 was conducted. quantification uncertainty accomplished using non-intrusive polynomial chaos method. viscous dissipation coefficient introduced analyze uncertain influence loss. Based type source, field divided into six regions, including...

Abstract Bearings are crucial components in mechanical equipment, and bearing failure is one of the reasons for equipment safety accidents. In this work, an optical fiber vibration sensor based on Sagnac interferometer (SI) proposed applied to fault detection. The polarization-maintaining (PMF) spliced between two single-mode fibers (SMFs) form a SMF-PMF-SMF (SPS) structure, which connected with 3 dB coupler SI SPS structure. mass block fixed middle PMF. When monitored surface or structure...

Studies on the geometry variation-related compressor uncertainty quantification (UQ) have often used dimension reduction methods, such as principal component analysis (PCA), for modeling of deviations. However, in PCA method, main eigenmodes were determined based only statistical behavior variations. While this process can cause some missing modes with a small eigenvalue, it is much more sensitive to blade aerodynamic performances, and thereby reducing reliability UQ analysis. Hence, novel...

To mobile communication requirement of portable device, a USB On-The-Go (OTG) system terminal, based on Freescale's 32-bit MCU - MCF52223, is designed in the paper. The terminal can implement host function and peripheral function. design includes software part hardware part. power management circuit interface design. OTG IDE CodeWarrior by component thinking. Firstly, we build architecture analyze its structural characteristics. Secondly, initialization mode judgement software, drive...

Manufacture variations can greatly increase the performance variability of compressor blades. Current robust design optimization methods have a critical role in reducing adverse impact variations, but be affected by errors if assumptions deviation models and distribution parameters are inaccurate. A new approach for without employment is proposed. The package method interval estimation exploited this approach. Simultaneously, stratified strategy used to reduce computational cost assure...

Fault diagnosis of rolling bearing is important for ensuring the safe operation industrial machinery. In order to improve accuracy fault, a fault method based on multiscale combined morphological filter (MCMF) and self-adaption improved fuzzy entropy (SAIMFE) proposed in this paper. First, MCMF designed eliminate noise preserve information more effectively. Second, SAIMFE extract features, optimized scale factor determined absolute skewness. Third, some experiments are completed demonstrate...

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Uncertainties in the aerodynamic performance of compressors, introduced by manufacturing variations, have received more and attentions recent years. The deviation model plays a crucial role evaluating this uncertainty facilitating robust design. However, current models with few variables cannot simultaneously achieve precise geometric approximation provide an accurate assessment uncertainty. This paper introduces novel modeling method named Nested Principal Component Analysis (NPCA) to break...

Abstract Manufactured compressor blades deviate from their intended design, leading to a shift in the mean and scattering of aerodynamic performance. To mitigate performance deterioration without escalating manufacturing costs, accurate efficient evaluation uncertainty, known as uncertainty quantification (UQ), is crucial. The computational cost three-dimensional fluid dynamics (CFD) simulations has prompted UQ studies predominantly target two-dimensional cases or extend three dimensions...

Abstract Aerodynamic uncertainties in compressors introduced by manufacturing variability have garnered increasing attention recent years. Accurately assessing the impact of variations on newly designed blades is essential for facilitating robust design. However, assessment performance uncertainty significantly influenced method employed to introduce geometric uncertainty. This paper investigates appropriate approach superimposing onto new blade profiles obtain accurate insights into...

Abstract Manufactured compressor blades deviate from their intended design, leading to a shift in the mean and scattering of aerodynamic performance. To mitigate performance deterioration without increasing manufacturing costs, an accurate efficient evaluation uncertainty, known as uncertainty quantification (UQ), is crucial. The high cost three-dimensional computational fluid dynamics (CFD) simulations has prompted UQ studies predominantly target two-dimensional cases or extend three...

Abstract The results of previous studies have proved that manufacture variations can cause a noticeable influence on compressor aerodynamic performance. main objective this paper is to investigate the rules and mechanisms supersonic/transonic blades used in study were measured from some newly manufactured high-pressure compressors. In present study, several blade sections with different design Mach number conditions are selected for further statistical analysis deviation data. Therefore,...

To mass data transmission and storage, a USB Mass Information Communication System, based on Freescale's 32-bit MCU - MCF52223, is designed in the paper. The MCF52223 integrates module. system can access document stored U disk under circumstance of no-PC. includes software part hardware part. IDE CodeWarrior designed. Hierarchical paper according to principle modular. consisted Host Controller Driver, Driver Layer, Peripheral Layer User Application Layer. Meanwhile, control protocols...

On the basis of analysis characteristics flash memory in HCS08 MCU family, how to perform program and erase operations are demonstrated during in-circuit programming family. In order solve unstable problem memory, three methods put forward. After studying on features methods, implementation is given. During debugging, MC9S08AW60 chose verify feasibility experiment experience supplied. The paper plays an importance role

The aerodynamic design of multi-stage transonic axial-flow compressors plays a critical role in the overall performance aeronautical engine, gas turbine and industry compression unit. Despite series new methods have been successfully proposed research development advanced compressors, redesign are still one most effective measures available products to meet requirements. In this work, geometry scaling technique is which 1D mean-line analysis 3D parametric geometric modeling used define key...