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Investigation of high-compactness and high-efficiency TPMS precoolers for precooled aero-engine

ENERGY 2025年 319卷

作者： Huang, W. S. Ning, H. Y. Tang, G. H. Xi An Jiao Tong Univ Sch Future Technol Xian 710049 Peoples R China Xi An Jiao Tong Univ Sch Energy & Power Engn Key Lab Thermo Fluid Sci & Engn MOE Xian 710049 Peoples R China

The precooler is the core functional component of the precooled air-breathing engines, which requires high power-to-weight ratio and robustness. However, the conventional compact tubular precooler suffers from low reliability, poor manufacturability and uneven flow distribution. The present study proposes a novel precooler based on triply periodic minimal surface (TPMS) in polar coordinate form. Firstly, the linear approximation method is introduced and regression models are established by response surface methodology (RSM) to determine the geometry parameters of polar TPMS. Then, the accuracy of the numerical method for TPMS is validated by experimental tests and new correlations for thermal and hydraulic performances of TPMS precooler are fitted. Subsequently, the segmental thermal design method and multi-objective genetic algorithm are combined for the multi-objective optimization of the precooler. Finally, the superior optimization objective combination selected by the decision-making method is compared with the conventional compact tubular precooler. The results indicate that the optimized TPMS precooler volume is reduced by 27.8%, with 23.8% increase in power-to- weight ratio. Additionally, the TPMS precooler fabricated by additive manufacturing can exhibit high reliability. The present methods for the novel TPMS precooler are also straightforward for high efficient and high compact heat exchangers in other fields under harsh thermal environment.

关键词： Triply periodic minimal surface linear approximation method Segmental design method Parameter analysis Response surface method Multi-objective genetic algorithm

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Modeling and simulation for V-shaped stacked graphene nanosheet FETs (GNFETs) for high frequency applications

e-Prime - Advances in Electrical Engineering, Electronics an...

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e-Prime - Advances in Electrical Engineering, Electronics and Energy 2025年 12卷

作者： Kumar, S. Raj Electronics Engineering (VLSI) Department Velammal College of Engineering and Technology Madurai India

A new 2D analytical model for the V-shaped Stacked Graphene Nanosheet Field Effect Transistor (GNFETs) is developed in this study. Using suitable boundary conditions, the linear approximation method (LAM) is used to determine the 2D Poisson equation for the first time. To assess the performance of the device, the exact analytical equations for the variables drain current, transconductance, threshold voltage, electric field, and channel potential are derived. The device operates at cryogenic temperatures as a result of the high electron fluxes into the channel caused by the effect of the Nanosheet channel contact with the gate. It offers a significant scaling of device with a large capacity for drive current. With a perpendicular layered structure, the V-shaped Nanosheet achieves low threshold voltage and high transconductance. When TCAD simulation software and analytical model results are compared, a good degree of agreement is obtained. © 2025 The Author(s)

关键词： Drain current Graphene nanosheet linear approximation method Threshold voltage Transconductance

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Stochastic resonance in single-mode semiconductor lasers

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PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 2006年第1期368卷 31-37页

作者： Wang, J. Bai, Y. M. Cao, L. Wu, D. J. Ma, X. Y. Chinese Acad Sci Inst Semicond Natl Engn Res Ctr Optoelect Device Beijing 100083 Peoples R China Huazhong Univ Sci & Technol Dept Phys Wuhan 430074 Peoples R China Chinese Acad Sci Inst Semicond Key Lab Semicond Mat Sci Beijing 100083 Peoples R China

Owing to the considerable virtues of semiconductor lasers for applications, they have become the main optical source for fiber communication systems recently. The behavior of stochastic resonance (SR) in direct-modulated semiconductor laser systems is investigated in this article. Considering the carrier and photon noises and the cross-correlation between the two noises, the power spectrum of the photon density and the signal-to-noise ratio (SNR) of the modulated laser system were calculated using the linear approximation method. We found that the SR always appears in the dependence of the SNR upon the bias current density, and is strongly affected by the cross-correlation coefficient of the carrier and photon noises, the frequency of modulation signal and the photon lifetime in the laser cavity. Hence, it is promising to use the SR mechanism to enhance the SNR of direct-modulated semiconductor laser systems and improve the quality of optical communication. (c) 2006 Elsevier B.V. All rights reserved.

关键词： stochastic resonance carrier noise photon noise semiconductor lasers linear approximation method

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Intensity correlation time of a single-mode laser driven by two coloured noises with coloured cross-correlation with direct signal modulation

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CHINESE PHYSICS 2005年第4期14卷 764-770页

作者： Chen, LM Cao, L Wu, DJ Wang, ZL Huazhong Univ Sci & Technol State Key Lab Laser Technol Wuhan 430074 Peoples R China Shenzhen Univ Dept Phys Shenzhen 518057 Peoples R China Huazhong Univ Sci & Technol Dept Phys Wuhan 430074 Peoples R China CCAST World Lab Beijing 100080 Peoples R China

In this paper, the intensity correlation time T is studied for the gain-noise model of a single-mode laser driven by coloured pump noise and coloured quantum noise with coloured cross-correlation with a direct signal modulation. By using the linear approximation method, it is found that when the pump noise is modulated directly by a signal, the effects of the cross-correlation between the pump noise and the quantum noise will disappear. In addition, there exists a maximum (i.e. resonance) in the curve of the intensity correlation time T versus the pump noise self-correlation time tau(1). Furthermore, when tau(1) < tau(2), the intensity correlation time T increases monotonically with the increase of D and decreases monotonically with the increase of Q, but when tau(1) > tau(2), the intensity correlation time T increases monotonically with the increase of Q and decreases monotonically with the increase of D.

关键词： intensity correlation time direct modulation signal linear approximation method

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Resilience assessment for natural gas systems and electrical power systems without complete integration

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IET GENERATION TRANSMISSION & DISTRIBUTION 2022年第24期16卷 4893-4913页

作者： Xie, Haipeng Fu, Wei Jiang, Lizhou Bie, Zhaohong Xi An Jiao Tong Univ State Key Lab Elect Insulat & Power Equipment 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China

Considering the limited information sharing between natural gas systems (NGS) and electrical power systems (EPS), this paper proposes a distributed resilience assessment method for NGS and EPS. First, a coordinated restoration framework is presented for incompletely integrated energy systems, and the collaborative benefit redistribution mechanism is proposed to motivate the participation of the cooperative restoration. Then fragility and recovery models for NGS and EPS components are developed, involving the impact of wind and rainfall during typhoons. An emergency load shedding model considering the conditional value at risk under typhoons is built, where the dynamic constraints of gas storage in NGS's pipelines is considered, and a linear approximation method is adopted to make the solution feasible. The modified alternating direction method of multipliers algorithm is used to solve the problem, and herein the self-adaptive penalty factor is leveraged to boost the efficiency. Based on the valley-shaped resilience model, the concept of skewness and kurtosis are introduced to give risk-adverse metrics more systematically to the impact of extreme events. The proposed model and algorithm are validated by case studies. Except for the performance exploration, the weakness and enhancement suggestions are also concluded from the case analysis.

关键词： valley-shaped resilience model natural gas collaborative benefit redistribution mechanism distributed resilience assessment method electrical power systems natural gas systems incompletely integrated energy systems gas storage EPS linear approximation method fragility risk management typhoons coordinated restoration framework NGS's pipelines load shedding information sharing recovery models modified alternating direction method complete integration

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Stochastic resonance for bias signal-modulated noise in a single-mode laser

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PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 2006年第1期366卷 159-166页

作者： Han, Li-Bo Cao, Li Wu, Da-Jin Wang, Jun Huazhong Univ Sci & Technol State Key Lab Laser Technol Wuhan 430074 Peoples R China Yangtze Univ Sch Phys Sci & Technol Hubei 434020 Peoples R China CCAST World Lab Beijing 100080 Peoples R China Huazhong Univ Sci & Technol Dept Phys Wuhan 430074 Peoples R China

By using the linear approximation method, the laser intensity power spectrum and signal-to-noise ratio (SNR) are calculated for a gain-noise model of a single-mode laser driven by colored cross-correlated pump noise and quantum noise, each of which is colored. We found that stochastic resonance(SR) appears in the behavior of the SNR versus not only the pump noise intensity and the self-correlation time, but also the bias current and the frequency of the signal. Moreover, a two-peaked SR occurs in the dependence of the SNR upon the self-correlation time when the cross-correlation coefficient between the both noises is positive, negative and zero, and the resonance peak is sharp. We also find both SR and suppression appear when the SNR varies with the frequency of the signal. (c) 2005 Published by Elsevier B.V.

关键词： linear approximation method colored cross-correlation noises bias signal modulation Stochastic resonance

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Stochastic resonance of bias signal-modulated noise in a single-mode laser

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CHINESE PHYSICS 2004年第11期13卷 1811-1814页

作者： Wang, J Cao, L Wu, DJ Huazhong Univ Sci & Technol State Key Lab Laser Technol Wuhan 430074 Peoples R China Chinese Ctr Adv Sci & Technol World Lab Beijing 100080 Peoples R China Huazhong Univ Sci & Technol Dept Phys Wuhan 430074 Peoples R China

Stochastic resonance (SR) for bias signal modulation is studied in a single-mode laser system. By investigating a gain-noise model driven by correlated pump noise and quantum noise, we find that, whether the correlation coefficient between both the noises is positive or negative, SR always appears in the dependence of signal-to-noise ratio (SNR) upon the noise correlation time and the frequency of the modulation signal. However, only when the correlation coefficient between both noises is negative can SR occur in the dependence of SNR upon the quantum noise intensity and pump noise intensity, while when the correlation coefficient between both noises is positive, it shows monotonically.

关键词： bias signal-modulated noise stochastic resonance linear approximation method

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Influences of quantum noises on direct-modulated properties of 1.3-μm InGaAsP/InP laser diodes

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CHINESE PHYSICS 2006年第9期15卷 2125-2129页

作者： Wang Jun Ma Xiao-Yu Bai Yi-Ming Cao Li Wu Da-Jin Chinese Acad Sci Inst Semicond Natl Engn Res Ctr Optoelect Beijing 100083 Peoples R China Chinese Acad Sci Inst Semicond Key Lab Semicond Mat Sci Beijing 100083 Peoples R China Huazhong Univ Sci & Technol Dept Phys Wuhan 430074 Peoples R China

Due to the zero dispersion point at 1.3-mu m in optical fibres, 1.3-mu m InGaAsP/InP laser diodes have become main light sources in fibre communication systems recently. In fluences of quantum noises on direct-modulated properties of single-mode 1.3-mu m InGaAsP/InP laser diodes are investigated in this article. Considering the carrier and photon noises and the cross-correlation between the two noises, the power spectrum of the photon density and the signal-to-noise ratio (SNR) of the direct-modulated single-mode laser system are calculated using the linear approximation method. We find that the stochastic resonance (SR) always appears in the dependence of the SNR on the bias current density, and is strongly affected by the cross-correlation coeffcient between the carrier and photon noises, the frequency of modulation signal, and the photon lifetime in the laser cavity. Hence, it is promising to use the SR mechanism to enhance the SNR of direct-modulated InGaAsP/InP laser diodes and improve the quality of optical fibre communication systems.

关键词： InGaAsP/InP laser diodes carrier noise photon noise linear approximation method

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Intensity Correlation Function of a Single-Mode Laser Driven by Colored Cross-Correlation Noises in Modulation of a Bias Signal

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Communications in Theoretical Physics 2005年第4期43卷 666-670页

作者： HANLi-Bo CAOLi YANGHong-Quan WUDa-Jin StateKeyLaboratoryofLaserTechnology HuazhongUniversityofScienceandTechnologyWuhan430074China／／DepartmentofPhysicsYangtzeUniversityJingzhou434020China StateKeyLaboratoryofLaserTechnology HuazhongUniversityofScienceandTechnologyWuhan430074China／／CCAST（WorldLaboratory）Beijing100080China DepartmentofPhysics YangtzeUniversityJingzhou434020China CCAST（WorldLaboratory） Beijing100080China／／DepartmentofPhysicsHuazhongUniversityofScienceandTechnologyWuhan430074China

By using the linear approximation method, the intensity correlation function is calculated for a single-mode laser modulated by a bias signal and driven by colored pump and quantum noises with colored cross-correlation. We found that, when the correlation time between the two noises is very short, the behavior of the intensity correlation function versus the time, in addition to decreasing monotonously, also exhibits several cases, such as one maximum, one minimum, and two extrema. When the correlation time between the two noises is very long, the behavior of the intensity correlation function exhibits oscillation and the envelope is similar to the case of short cross-correlation time.

关键词： linear approximation method intensity correlation function bias signal modulation oscillation

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Output power spectrum of a single-mode laser driven by coloured pump and quantum noises with coloured correlation

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CHINESE PHYSICS 2004年第10期13卷 1717-1721页

作者： Han, LB Cao, L Wu, DJ Huazhong Univ Sci & Technol State Key Lab Laser Technol Wuhan 430074 Peoples R China Yangtze Univ Dept Phys Jinzhou 434100 Peoples R China CCAST World Lab Beijing 100080 Peoples R China

By using the linear approximation method, the output power spectrum is calculated for a single-mode laser driven by coloured pump and quantum noises with coloured correlation. We have observed that the configuration of the output power spectrum is complicated: that is, it can be of single peak, two peaks or three peaks. The configurations of the power spectrum can be transformed from one into another by changing the cross-correlation time, the cross-correlation coefficient between the two noises, and pump noise intensity.

关键词： linear approximation method power spectrum coloured correlation noises

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