bluuebunny/crossref_metadata_2025_split huggingface dataset:
Finite Element Simulation and Structural Optimization of Structural Flow Sequential Field for Sequential Boost Switching Valve
Authors: Wang Lijun , Jia Jianli , Zhong Yi , Zhou Xueying , Xu Jiang , Hao Yajing 
Published: June 2023

Abstract
Turbocharging technology is an important part of engine technology. Under the working condition of 730 °C and 0.5 MPa, the valve plate opening and closing will bear the high pressure of the internal fluid medium, resulting in the deformation of the switching valve. In this paper, ANSYS finite element simulation software is used to establish the valve fluid domain model, and the stress field and deformation law of the valve under the valve plate opening of 0 °~ 90 °are simulated and analyzed. Based on the fluid-solid coupling theory, the deformation and stress distribution of the valve plate structure are obtained by simulation analysis. The simulation results show that the smaller the opening of the valve plate, the more disordered the flow condition. As the opening increases, the flow tends to be stable. When the opening is 30 °, the negative pressure inside the valve is the largest; combined with the fluid-solid coupling analysis, the maximum stress load on the valve plate appears at the connection between the valve plate and the long valve shaft and the short valve shaft, and the maximum pressure appears at the opening of 60 °, which is 37.144 MPa; the maximum deformation occurs at the outer edge of the valve plate. Based on the results of this simulation analysis, the corresponding multi-objective structural optimization of the valve structure is carried out to provide technical reference for the structural design of similar valves.
Study on Delay Release Time of Fuze Based on ADAMS
Authors: Zhang Yinhuan , Xiao Qinkun , Liu Xing , Zhao Wenhuang , Xue Jingyun 
Published: June 2023

Abstract
In order to study the arming process of electromechanical fuze security mechanism, a dynamic simulation method using ADAMS software is proposed; The simulation model of the security mechanism is established, and the existence of complex factors such as contact and collision between the rotor and adjacent components is considered in the calculation process. The time of the horizontal rotor is simulated, and the flexibility and rapidity of the rotor rotation are verified, as well as the reliability of the locking mechanism; The simulation results are compared with the statistical results of high-speed camera test, and the correctness of ADAMS software simulation results is verified.
Simulation Study of Semi-active Suspension Fuzzy Adaptive PID Control System
Authors: Wu Jianfeng , Yang Daizhe , Cao Wei , Sun Jing , Wang Yifan , Cao Zhiyang 
Published: June 2023

Abstract
This work develops a mathematical model of a quarter car suspension system with two degrees of freedom and suggests a fuzzy adaptive PID controller by assessing the drawbacks of conventional control methods. The three PID parameters are automatically modified by fuzzy control, and the PID parameters are adjusted in real time. The Matlab/Simulink platform is used to create the relevant simulation model. The simulation results demonstrate the superiority of the fuzzy adaptive PID control system suggested in this study by demonstrating a reduction in the Sprung Mass Acceleration by 17.85%, the Suspension Working Space by 14.42%, and the Dynamic Tyre Load by 9.48%.
Research on Aging State Detection Method of Rubber O-ring Sealing Structure
Authors: Huang Jiaqi , Qu Jinxiu , Guo Jinzhu , Shi Xiaowei , Bai Yumei , Cao Wei 
Published: June 2023

Abstract
The rubber seal structure is used extensively in mechanical devices, long-term use may bring major safety hazards and economic losses. In order to ensure the healthy operation of machinery and equipment, it is necessary to test the aging condition of the rubber sealing structure nondestructive online. In order to address the problem of unsteady vibration signals, a complex nonstationary signal is degraded into the sum of multiple product functions by means of global local mean decomposition, and then the energy features in these PF components are extracted, and the first three components with the largest energy eigenvalues are selected to form a sensitive feature vector set. Overall, the results of the search data show that the proposed method can efficiently extract energy features from a large set of original features, and the first three largest energy features can be selected to form a sensitive feature set, which can provide effective data information for the detection of the aging state of Rubber O-ring Sealing Structure (ROSS) in the next step.
Investigation of the supersonic flow past a wedge-shaped geometry using pressure sensitive paints technique
Authors: Hála J , Šimurda D , Lepičovský J , Luxa M 
Published: June 2023

Abstract
This study aims to present results of an investigation of the supersonic flow past a wedge-shaped geometry using the pressure sensitive paints technique (PSP). The wedge-shaped geometry was chosen as a canonical case for the investigation of the supersonic flow involving shock waves and strong expansion making it a convenient case to build a first practical experience with this technique, further intended for use in the investigation of linear blade cascades in high speed laboratory of the Institute of Thermomechanics of the Academy of Sciences of the Czech Republic. The tests on the wedge-shaped geometry were complemented with the numerical simulations and static pressure taps measurements. The resulting static pressure distribution obtained using the PSP on the wedge-shaped model revealed all main flow structures including positions of the separation and reattachment shocks providing a good picture of the whole flow field.
Half-scale transonic compressor rapid testing rig
Authors: Wang T , Taylor J V 
Published: June 2023

Abstract
High-speed compressor testing is costly due to mechanical complexity and hazardous due to the high energy involved. In the past this has limited the speed and amount of testing. In this paper a new rig architecture is presented that aims to test a scaled transonic compressor stage rapidly. It builds upon the low-speed rapid testing developments made at the Whittle Laboratory and has potential to accelerate technology development. The power input requirement is reduced by testing at half-scale and reduced Reynolds number while maintaining the Mach number. Further power saving and mechanical simplification is achieved by employing a turbo-expander architecture with no shaft-power input, only the aerodynamic losses in system must be overcome. The aerodynamic and mechanical design of the rig is presented. Safe operation and rapid access and rebuild times are critical. The test hardware is machined from solid and bladed disks and rings can be manufactured in days. Only standard instrumentation is required, although a novel control loop is employed to achieve the same accuracy in rotational speed as an electric motor driven compressor rig. Experiments up to 25% design rotational speed were conducted, and the results presented here show that the rig is controllable and inherently safe if the research compressor fails. The rig will be run to full speed in the immediate future and extension to the capability is planned with multi-stage high-speed testing in a second machine.
CFD-supported data reduction of hot-wire anemometry signals for compressible organic vapor flows
Authors: Hake L , Sundermeier S , Wiesche S aus der , Bienner A. , Gloerfelt X , Matar C , Cinnella P 
Published: June 2023

Abstract
For obtaining turbulent fluctuations in compressible organic vapor flows, computational fluid dynamics (CFD) analysis tools were used to support the data reduction process of hot-wire anemometry signals. It was found that CFD can help during the calibration process of actual hot-wire probes operated in the constant-temperature mode. Such an approach is beneficial for determining the dependency of the sensitivity coefficients on Reynolds and Mach numbers. Due to the small Kolmogorov scales, corrections are needed for probes with finite wire lengths. The experimental and numerical analysis considering the decay of turbulence downstream a grid indicated that the correction scheme proposed by Wyngaard leads to consistent results for compressible organic vapors. The new developments provide recommendations for obtaining turbulent quantities of compressible organic vapor flows utilizing hot-wire anemometry.
Experimental monitoring of vibrations and the problem of amplitude quantification
Authors: Schneider Alexandra P. , Paoletti Benoit , Ottavy Xavier , Brandstetter Christoph 
Published: June 2023

Abstract
Experimental monitoring of blade vibration in turbomachinery is typically based on blade-mounted strain gauges. Their signals are used to derive vibration amplitudes which are compared to previously determined modal scope limits, including a safety factor. According to industrial guidelines, this factor is chosen conservatively to ensure safe operation of the machine.
For the experimental campaign with the open test case fan ECL5, which is representative for modern lightweight UHBR architectures, it is planned to conduct measurements close to the stability limit. These investigations require a close approach to the limit and hence demand for accurate quantification of vibration amplitudes to ensure secure operation without exhaustive safety margins. It is required that the surveillance is possible in real time and not only in post-processing.
Historically, short-time Fourier transformations of vibration sensors are used, but the complex nature of coupled phenomena near the stability limit has an influence on the amplitude accuracy, depending on evaluation parameters. This was demonstrated in a previous study using fast response wall pressure transducers. The present study investigates the influence on blade vibration data of a modern composite material transonic fan. Different methods are compared, sensitivity to evaluation parameters is analyzed and guidelines are given for fast and robust surveillance of critical vibration modes.
Infrared thermography techniques for boundary layer state visualisation
Authors: Davis William , Atkins Nicholas R 
Published: June 2023

Abstract
Decarbonising power generation and aviation requires step changes in aerothermal technology. This necessitates working in large design spaces where boundary layer state and resulting loss and heat transfer characteristics are difficult to predict. Standard measurement techniques such as thin-film gauges and oil flow visualisation are intrusive and time consuming, so there is a need for rapid testing methods to diagnose boundary layer state and develop physical understanding. Infrared (IR) thermography has found wide use in aerothermal research and IR measurements of boundary layer state have been demonstrated in many experiments, however there is minimal literature on the best practices for fast and accurate measurements. IR transition measurements rely on temperature differences between laminar and turbulent regimes which are dependent on the thermal characteristics of the system. This paper shows how a 1D heat transfer analysis can be used to maximise the signal-to-noise ratio (SNR) of IR measurements. This can improve measurement quality and minimise complexity. Experimental validation is presented along with a demonstration of the value of IR in rapid testing.
Nitrogen Experiments on a Supersonic Linear Cascade For ORC Applications
Authors: Manfredi Marco , Spinelli Andrea , Persico Giacomo , Gaetani Paolo , Dossena Vinenzo 
Published: June 2023

Abstract
A novel experiment has been conceived at Politecnico di Milano for the study of the flow within and downstream of supersonic cascades of Organic Rankine Cycle (ORC) turbines. This paper documents the first phase of the research, focused on the preliminary tests and studies performed by operating the facility with nitrogen as working fluid, to demonstrate the technical relevance of the experiment and the validity of the measurement system in a simplified thermodynamic condition. The set of measured data includes, beside the inlet total thermodynamic state, eight static pressure values obtained via taps manufactured on the test section rear end-wall, both within the bladed and semi-bladed region of the cascade, as well as a total pressure probe to retrieve the cascade performance. A double-passage Schlieren equipment was also employed to visualize the density gradients. Experiments show an outstanding repeatability, indicate a quasi-steady cascade operation during the blow-down process for all the pressure signal considered, and demonstrate a remarkable periodicity among two consecutive channels also in off-design conditions. Experimental data were also compared with CFD simulations, resulting in an excellent agreement for the pressure data acquired both within and downstream of the cascade.
Measure of the solar flux conveyed onto a lambertian target by a novel bi-axial fresnel concentrator
Authors: Antonelli M , Caposciutti G 
Published: June 2023

Abstract
This paper deals with the optical analysis of a prototype of a novel concentrator, named as Bi-Axial Fresnel (BAF). This concentrator aims at reducing production and installation costs, as well as keeping as low as possible the weight and the bulk of the mirrors field, making it suitable for building small-dimensions systems, able to be placed on industrial roofs, as an example. The prototype is composed as an array of 3x3 mirrors. Its theoretical concentration is therefore 9. The experiment made use of a very basic equipment, which included a thermal flux sensor and a simple webcam, properly equipped for distinguish grey scales under quite high solar intensities. The concentrator was governed by an Arduino card, while the acquisition took place by means of a National Instruments acquisition board and Labview software. The aim of this experimental setup was the reconstruction of the solar flux on a fixed Lambertian target, based on the grey-scale maps gathered through the webcam and properly scaled accordingly to the punctual solar flux measured by the sensor. This way, the experimental apparatus was able to get an estimation of the solar power conveyed to the target.
Water-Cooled Fast-Response Wall-Static Pressure Probes for Harsh Combustor Environment Applications
Authors: Clinckemaillie Julien , Fontaneto Fabrizio , Champion-Réaud Jean-Louis , Bouty Eric , Mendes Carlos 
Published: June 2023

Abstract
The present paper discusses the design methodology for a water-cooled fast-response wall-static pressure probe intended for measurements in the combustion chamber of gas turbines, as well as the results from a series of tests performed with the prototype of the probe mounted in the primary zone of the combustion chamber of a turboshaft engine test rig. The first part of the present paper reviews the design methodology of a water-cooled fast-response wall static pressure probe intended for measurements of combustion noise and instabilities in gas turbine combustors, describing the optimization of measurement performance in terms of frequency bandwidth ([0 – 40kHz]) as well as the design of the cooling layout ensuring the sensor’s integrity within a harsh environment. The second part of the paper focuses on the analysis of the results obtained from trial tests performed using the probe prototype mounted in the primary zone of the combustion chamber of a helicopter engine test rig. The strengths and strong potential for further growth of the current probe design are highlighted, while its shortcomings and (short-term) solutions to these shortcomings are also discussed.
High-order field theory and a weak Euler–Lagrange–Barut equation for classical relativistic particle-field systems
Authors: FAN Peifeng , CHEN Qiang , XIAO Jianyuan , YU Zhi 
Published: June 2023

Abstract
In both quantum and classical field systems, conservation laws such as the conservation of energy and momentum are widely regarded as fundamental properties. A broadly accepted approach to deriving conservation laws is built using Noether’s method. However, this procedure is still unclear for relativistic particle-field systems where particles are regarded as classical world lines. In the present study, we establish a general manifestly covariant or geometric field theory for classical relativistic particle-field systems. In contrast to quantum systems, where particles are viewed as quantum fields, classical relativistic particle-field systems present specific challenges. These challenges arise from two sides. The first comes from the mass-shell constraint. To deal with the mass-shell constraint, the Euler–Lagrange–Barut (ELB) equation is used to determine the particle’s world lines in the four-dimensional (4D) Minkowski space. Besides, the infinitesimal criterion, which is a differential equation in formal field theory, is reconstructed by an integro-differential form. The other difficulty is that fields and particles depend on heterogeneous manifolds. To overcome this challenge, we propose using a weak version of the ELB equation that allows us to connect local conservation laws and continuous symmetries in classical relativistic particle-field systems. By applying a weak ELB equation to classical relativistic particle-field systems, we can systematically derive local conservation laws by examining the underlying symmetries of the system. Our proposed approach provides a new perspective on understanding conservation laws in classical relativistic particle-field systems.
Cross-modal sensory boosting to improve high-frequency hearing loss
Authors: Kohler Izzy , Perrotta Michael V. , Ferreira Tiago , Eagleman David M. 
Published: June 2023

AbstractHigh frequency hearing loss is one of the most common problems in the aging population and with those who have a history of exposure to loud noises. To address high-frequency hearing loss, we developed a multi-motor wristband that uses machine learning to listen for specific high frequency phonemes. The wristband vibrates in spatially unique locations to represent which phoneme was present, in real time. We recruited 16 participants with high frequency hearing loss and asked them to wear the wristband for six weeks. Their degree of disability associated with hearing loss was measured weekly using the Abbreviated Profile of Hearing Aid Benefit (APHAB). Our findings show that vibrotactile sensory substitution delivered by a wristband that produces spatially distinguishable vibrations in correspondence with high frequency phonemes helps individuals with high frequency hearing loss improve their understanding of verbal communication. We find that vibrotactile feedback provides benefits whether or not a person wears hearing aids, albeit in slightly different ways. Finally, our results also demonstrate that individuals with the greatest difficulty understanding speech prior to the study experience the greatest amount of benefit from vibrotactile feedback.
Using Polygenic Scores for Circadian Rhythm to predict Wellbeing, Depressive Symptoms, Chronotype, and Health
Authors: Landvreugd A. , Pool R. , Nivard M. , Bartels M. 
Published: June 2023

AbstractThe association between the circadian rhythm and diseases has been well-established, while the association with mental health is less explored. Given the heritable nature of the circadian rhythm, this study aimed to investigate the relationship between genes underlying the circadian rhythm and mental health outcomes, as well as a possible gene-environment correlation for circadian rhythm. In a sample from the Netherlands Twin Register (N= 14,021), polygenic scores (PGSs) were calculated for two circadian rhythm measures: Morningess and Relative Amplitude. The PGSs were used to predict mental health outcomes such as subjective happiness, quality of life, and depressive symptoms In addition, we performed the same prediction analysis in a within-family design in a subset of dizygotic twins. The PGS for Morningness significantly predicted Morningness (R2= 1.55%,) and Depressive Symptoms (R2= 0.22%,). The PGS for Relative Amplitude significantly predicted General Health (R2= 0.12%,) and Depressive Symptoms (R2= 0.20%,). Item analysis of the depressive symptoms showed that 4/14 items were significantly associated with the PGSs. The within-family results hinted at a gene-environment correlation for Morningness. Overall, the results showed that people with a genetic predisposition of being a morning person or a high relative amplitude are likely to have fewer depressive symptoms. Contrarily to our hypotheses, the four associated depressive symptoms described symptoms related to decision-making, energy, and feeling worthless, rather than sleep. Our findings plead for a substantial role for the circadian rhythm in depression research, and to further explore the gene-environment correlation in the circadian rhythm.
Rapid and Multiplexed Nucleic Acid Detection using Programmable Aptamer-Based RNA Switches
Authors: Yan Zhaoqing , Tang Anli A. , Eshed Amit , Ticktin Zackary M. , Chaudhary Soma , Ma Duo , McCutcheon Griffin , Li Yudan , Wu Kaiyue , Saha Sanchari , Alcantar-Fernandez Jonathan , Moreno-Camacho Jose L. , Campos-Romero Abraham , Collins James J. , Yin Peng , Green Alexander A. 
Published: June 2023

ABSTRACTRapid, simple, and low-cost diagnostic technologies are crucial tools for combatting infectious disease. Here, we describe a class of aptamer-based RNA switches called aptaswitches that recognize specific target nucleic acid molecules and respond by initiating folding of a reporter aptamer. Aptaswitches can detect virtually any sequence and provide a fast and intense fluorescent readout, generating signals in as little as 5 minutes and enabling detection by eye with minimal equipment. We demonstrate that aptaswitches can be used to regulate folding of six different fluorescent aptamer/fluorogen pairs, providing a general means of controlling aptamer activity and an array of different reporter colors for multiplexing. By coupling isothermal amplification reactions with aptaswitches, we reach sensitivities down to 1 RNA copy/µL in one-pot reactions. Application of multiplexed one-pot reactions against RNA extracted from clinical saliva samples yields an overall accuracy of 96.67% for detection of SARS-CoV-2 in 30 minutes. Aptaswitches are thus versatile tools for nucleic acid detection that can be readily integrated into rapid diagnostic assays.