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A Ventral Diverterless High Offset S-shaped Inlet at Transonic Speeds 被引量:5
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作者 谢文忠 郭荣伟 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2008年第3期207-214,共8页
An investigation on the ventral diverterless high offset S-shaped inlet is carried out at Mach numbers from 0.600 to 1.534, angles of attack from -4° to 9.4°, and yaw angles from 0° to 8°. Results ... An investigation on the ventral diverterless high offset S-shaped inlet is carried out at Mach numbers from 0.600 to 1.534, angles of attack from -4° to 9.4°, and yaw angles from 0° to 8°. Results indicate: (1) a large region of low total pressure exists at the lower part of the inlet exit caused by the counter-rotating vortices in the S-shaped duct; (2) the performances of the inlet at Mach number 1.000 reach almost the highest, so the propulsion system could work efficiently in terms of aerodynamics; (3) the total pressure recovery increases slowly at first and then remains unvaried as the Mach number rises from 0.6 to 1.0, however, it does in an opposite manner in the conventional diverter-equipped S-shaped inlet; (4) the performances of the inlet are generally insensitive to angles of attack from -4° to 9.4° and yaw angles from 0° to 8° at Mach number 0.850, and angles of attack from -2° to 6° and yaw angles from 0° to 5° at Mach number 1.534. 展开更多
关键词 aerospace propulsion system diverterless inlet high offset transonic inlet s-shaped inlet experimental investigation
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Numerical Investigation of Electrohydrodynamic (EHD) Flow Control in an S-Shaped Duct 被引量:7
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作者 杨晖 李锋 +1 位作者 宋耀颖 孙佰刚 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第10期897-904,共8页
An electrohydrodynamic (EHD) method, which is based on glow discharge plasma, is presented for flow control in an S-shaped duct. The research subject is an expanding channel with a constant width and a rectangular c... An electrohydrodynamic (EHD) method, which is based on glow discharge plasma, is presented for flow control in an S-shaped duct. The research subject is an expanding channel with a constant width and a rectangular cross section. An equivalent divergence angle and basic function are introduced to build the three-dimensional model. Subsequently, the plasma physical models are simplified as the effects of electrical body force and work (done by the force) on the fluid near the wall. With the aid of FLUENT software, the source terms of momentum and energy are added to the Navier-Stokes equation. Finally, the original performance of three models (A, B and C) is studied, in which model A demonstrates better performance. Then EHD control based on model A is discussed. The results show that the EHD method is an effective way of reducing flow loss and improving uniformity at the duct exit. The innovation in this study is the assessment of the EHD control effect on the flow in an S-shaped duct. Both the parametric modeling of the S-shaped duct and the simplified models of plasma provide valuable information for future research on aircraft inlet ducts. 展开更多
关键词 electro hydrodynamic (EHD) s-shaped duct flow control glow discharge plasma total pressure.
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Incorporating S-shaped testing-effort functions into NHPP software reliability model with imperfect debugging 被引量:7
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作者 Qiuying Li Haifeng Li Minyan Lu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第1期190-207,共18页
Testing-effort(TE) and imperfect debugging(ID) in the reliability modeling process may further improve the fitting and prediction results of software reliability growth models(SRGMs). For describing the S-shaped... Testing-effort(TE) and imperfect debugging(ID) in the reliability modeling process may further improve the fitting and prediction results of software reliability growth models(SRGMs). For describing the S-shaped varying trend of TE increasing rate more accurately, first, two S-shaped testing-effort functions(TEFs), i.e.,delayed S-shaped TEF(DS-TEF) and inflected S-shaped TEF(IS-TEF), are proposed. Then these two TEFs are incorporated into various types(exponential-type, delayed S-shaped and inflected S-shaped) of non-homogeneous Poisson process(NHPP)SRGMs with two forms of ID respectively for obtaining a series of new NHPP SRGMs which consider S-shaped TEFs as well as ID. Finally these new SRGMs and several comparison NHPP SRGMs are applied into four real failure data-sets respectively for investigating the fitting and prediction power of these new SRGMs.The experimental results show that:(i) the proposed IS-TEF is more suitable and flexible for describing the consumption of TE than the previous TEFs;(ii) incorporating TEFs into the inflected S-shaped NHPP SRGM may be more effective and appropriate compared with the exponential-type and the delayed S-shaped NHPP SRGMs;(iii) the inflected S-shaped NHPP SRGM considering both IS-TEF and ID yields the most accurate fitting and prediction results than the other comparison NHPP SRGMs. 展开更多
关键词 testing-effort(TE) imperfect debugging(ID) software reliability growth models(SRGMs) s-shaped non-homogeneous Poisson process(NHPP)
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Modeling behaviors of a coal pillar rib using the progressive S-shaped yield criterion 被引量:1
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作者 Sankhaneel Sinha Gabriel Walton 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2020年第3期484-492,共9页
Spalling of pillar ribs has been a major hazard in the mining industry for decades.In the absence of rib support guidelines,accidents have continued to occur in recent years.Developing effective support guidelines req... Spalling of pillar ribs has been a major hazard in the mining industry for decades.In the absence of rib support guidelines,accidents have continued to occur in recent years.Developing effective support guidelines requires a complete understanding of complex pillar damage mechanisms.Continuum models represent a convenient tool for analyzing this problem,but the behavior of such models is dependent of the choice of the constitutive model.In this study,a recently proposed constitutive model was used to simulate the rib fracturing process in a longwall chain pillar at West Cliff mine.After calibration,the model was able to capture the rib displacement profiles for multiple locations of the longwall face and the stress evolution 4 m into the pillar.The rib bolts in the model were found to be yielding over 60% of their length under the headgate loading condition.The model also predicted a steady damage accumulation in the rib for certain face locations,which is consistent with the description of the rib at the site.Damage was localized along the upper part of the pillar and underscored the role that the dirt band played in controlling rib deterioration at the site.The ability of the numerical model to replicate field measurements provides confidence in the capabilities of the new constitutive model.Finally,the need of using multi-point calibration is highlighted by comparing the results of the calibrated model to an alternative model calibrated to a smaller amount of data. 展开更多
关键词 s-shaped yield criterion Coal pillar BACK-ANALYSIS Numerical modeling
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Analysis and Simulation of S-shaped Waveguide in Silicon-on-insulator 被引量:1
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作者 WANGZhang-tao FANZhong-cao XIAJin-song CHENShao-wu YuJinzhong 《Semiconductor Photonics and Technology》 CAS 2004年第2期78-81,共4页
The simulation and analysis of S-shaped waveguide bend are presented.Bend radius larger than 30 mm assures less than 0.5 dB radiation loss for a 4-μm-wide silicon-on-insulator waveguide bend with 2-μm etch depth.Int... The simulation and analysis of S-shaped waveguide bend are presented.Bend radius larger than 30 mm assures less than 0.5 dB radiation loss for a 4-μm-wide silicon-on-insulator waveguide bend with 2-μm etch depth.Intersection angle greater than 20° provides negligible crosstalk (<-30 dB) and very low insertion loss.Any reduction in bend radius and intersection angle is at the cost of the degradation of characteristics of bent waveguide and intersecting waveguide, respectively. 展开更多
关键词 BPM s-shaped bend SILICON-ON-INSULATOR
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Design of an 868 MHz Printed S-Shape Monopole Antenna
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作者 Gerard Rushingabigwi Liguo Sun 《Journal of Computer and Communications》 2015年第3期49-55,共7页
The purpose of this work is to design and analyze an s-shaped printed circuit board (PCB) monopole antenna. The antenna was analyzed to operate at a resonance frequency band of 868 MHz;acceptable in 915 MHz as well. T... The purpose of this work is to design and analyze an s-shaped printed circuit board (PCB) monopole antenna. The antenna was analyzed to operate at a resonance frequency band of 868 MHz;acceptable in 915 MHz as well. The s-shape is selected due to the need of reducing the overall size of the normal monopole antenna. The printed antenna was designed with an approximate overall size of 39 × 56 mm2 of which the antenna’s upper side is 26 × 39 mm2 while its reference ground board was sized at 39 × 30 mm2. The antenna is fed by a strip line of 3 × 1.5 mm2, in series with a 4.4 pF capacitance and shunt with an 8.7 nH inductance for purpose of antenna’s impedance matching with the input. A couple of existing publications showed that PCB antenna is not a new technology;however not an old technology for telecommunication industry. The raised problem by this work was duly solved with HFSS as a tool;excellent results are presented. After duly matching the antenna’s impedance with 50 Ω microstrip feed-line, solutions for overall performance were analyzed and demonstrated optimal: radiation patterns were proven omnidirectional, antenna gain optimized. The present antenna prototype’s overall dimensions can be readjusted according to any industrial and manufacturing requests. 展开更多
关键词 DESIGN of AN 868 MHZ PRINTED s-shape Monopole Antenna
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Enhancement of Characteristics of Antenna Arrays Employing S-Shaped Resonators
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作者 Belgacem Aouadi Jamel Belhaj Tahar 《Journal of Electromagnetic Analysis and Applications》 2012年第8期326-332,共7页
This paper illustrates a simple kind of tri-band printed G-shaped monopole antenna for Multiple-Input-Multiple-Output (MIMO) systems. The proposed antenna is used to achieve three operating frequencies, 2.45 GHz, 5.2 ... This paper illustrates a simple kind of tri-band printed G-shaped monopole antenna for Multiple-Input-Multiple-Output (MIMO) systems. The proposed antenna is used to achieve three operating frequencies, 2.45 GHz, 5.2 GHz and 8.2 GHz for wireless communications. To improve the isolation between the two radiating elements, we use left-handed materials composed of only S-shaped resonators to get negative refractive index at the three operating frequencies. When one layer of S-shaped resonators is employed, the antenna correlation, the diversity gain and the bandwidth are also enhanced. The simulated results are presented and evaluated with and without left-handed materials. 展开更多
关键词 G-shaped MONOPOLE ANTENNA MIMO Systems s-shaped Resonators Mutual Coupling ANTENNA Correlation
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Shaping ability of thermomechanically treated files in simulated S-shaped root canals
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作者 Nessrin A. Taha Ghada A. Maghaireh +2 位作者 Dyana El Sadek Rafat Bagheri Mohammad Al-Omari 《Open Journal of Stomatology》 2013年第7期386-391,共6页
Aim: the aim of this study was to investigate the shaping ability of thermomechanically treated files manufactured by twisting(Twisted files)and compare it to conventional rotary system (K3, Sybron Endo, Orange, CA) i... Aim: the aim of this study was to investigate the shaping ability of thermomechanically treated files manufactured by twisting(Twisted files)and compare it to conventional rotary system (K3, Sybron Endo, Orange, CA) in S-shaped canals, including formation of ledges, zipping, elbow, outer widening, danger zone, perforation and file deformation. Materials & Methods: Forty S-Shaped canals in resin blocks were randomly divided into 2 groups of 20 each. Pre-instrumentation images of the canals were taken via a digital camera and superimposed on images taken after preparation with TF and K3 systems to apical size of 25/06 and 30/06. Canal aberrations were measured from the superimposed image at five levels using AutoCAD system. Fisher exact test and Mann Whitney test were used for analysis of the data. Results: the incidence of zipping, elbow and apical transportation was significantly lower in the TF group (P = 0.04). Generally the incidence of aberration increased when the apical size increased to 30/0.06 regardless of the file system. Significant file deformation was evident in the TF after single use (P ? 0.001). Conclusion: Under the conditions of this study, TF manufactured by new technique performed better than K3 systems when used up to size 25/06 in simulated S-shaped canals. Clinical significance: The flexibility of thermomechanically treated files is beneficial in canals with multiple curvatures;however, attention should be paid to the instrument taper and final apical size of the preparation. 展开更多
关键词 Keywords: s-shaped CANAL TWISTED FILES K3 CANAL ABERRATION
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Analysis of the generation mechanism of the S-shaped J–V curves of MoS_(2)/Si-based solar cells
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作者 He-Ju Xu Li-Tao Xin +2 位作者 Dong-Qiang Chen Ri-Dong Cong Wei Yu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第3期608-612,共5页
Amorphous–microcrystalline MoS_(2)thin films are fabricated using the sol-gel method to produce MoS_(2)/Si-based solar cells. The generation mechanisms of the S-shaped current density–voltage(J–V) curves of the sol... Amorphous–microcrystalline MoS_(2)thin films are fabricated using the sol-gel method to produce MoS_(2)/Si-based solar cells. The generation mechanisms of the S-shaped current density–voltage(J–V) curves of the solar cells are analyzed. To improve the performance of the solar cells and address the problem of the S-shaped J–V curve, a MoS_(2)film and a p^(+) layer are introduced into the front and back interfaces of the solar cell, respectively, which leads to the formation of a p–n junction between the p-Si and the MoS_(2)film as well as ohmic contacts between the MoS_(2)film and the ITO, improving the S-shaped J–V curve. As a result of the high doping characteristics and the high work function of the p^(+) layer, a high–low junction is formed between the p;and p layers along with ohmic contacts between the p;layer and the Ag electrode. Consequently,the S-shaped J–V curve is eliminated, and a significantly higher current density is achieved at a high voltage. The device exhibits ideal p–n junction rectification characteristics and achieves a high power-conversion efficiency(CE) of 7.55%. The findings of this study may improve the application of MoS_(2)thin films in silicon-based solar cells, which are expected to be widely used in various silicon-based electronic and optical devices. 展开更多
关键词 MoS_(2)/Si-based solar cell s-shaped J–V curve power conversion efficiency p^(+)layer
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Study on S-shaped region of pump turbine based on Omega vortex analysis method and entropy production theory
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作者 Zhenggui Li Hongji Zeng +3 位作者 Kun Wang Xiaodong Peng Shengnan Yan Qin Zhao 《International Journal of Agricultural and Biological Engineering》 SCIE 2023年第3期102-109,F0003,共9页
In order to comprehensively analyze the operation instability of the pump turbine S-shaped region,this paper uses DDES turbulence model to calculate the model pump turbine from the perspective of the evolution law of ... In order to comprehensively analyze the operation instability of the pump turbine S-shaped region,this paper uses DDES turbulence model to calculate the model pump turbine from the perspective of the evolution law of runner vortex and draft tube vortex rope and entropy production rate,combined with experiments.The results show that the numerical simulation is in good agreement with the experiment.Omega vortex analysis method is more accurate than other vortex recognition methods because it is not affected by the threshold value.The vortices at the runner region under the runaway condition and the turbine brake condition develop towards the vaneless space and the blade pressure surface respectively,which will cause the flow obstruction and blade separation.The overall vorticity of the reverse pump condition is the largest.The vortex rope of the draft tube under runaway and turbine brake conditions is columnar in shape and has very high rotational strength.The vortex rope under reverse pump conditions is prone to fracture and form scattered vortices,impeding the normal movement of the fluid.The entropy production rate of the spanwise surface near the upper ring and the lower crown is greater than the middle spanwise surface due to the boundary layer effect.And the energy dissipation in the runner under reverse pump conditions is characterized by high at both ends of the runner and low in the middle.The energy dissipation near the wall of the straight cone section of the draft tube is large due to the squeezing effect of the vortex rope on the flow. 展开更多
关键词 pump turbine s-shaped region vortex analysis method vortex evolution entropy production rate
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Optimal investment based on relative performance and weighted utility
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作者 WANG Lei DONG Ying-hui HUA Chun-rong 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2024年第2期328-342,共15页
This paper studies the optimal portfolio allocation of a fund manager when he bases decisions on both the absolute level of terminal relative performance and the change value of terminal relative performance compariso... This paper studies the optimal portfolio allocation of a fund manager when he bases decisions on both the absolute level of terminal relative performance and the change value of terminal relative performance comparison to a predefined reference point. We find the optimal investment strategy by maximizing a weighted average utility of a concave utility and an Sshaped utility via a concavification technique and the martingale method. Numerical results are carried out to show the impact of the extent to which the manager pays attention to the change of relative performance related to the reference point on the optimal terminal relative performance. 展开更多
关键词 relative performance weighted utility s-shaped utility CONCAVIFICATION
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售货机升降系统S型速度控制策略
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作者 冯高明 邱文仙 金明磊 《电子科技》 2024年第5期54-61,共8页
在传统三闭环控制方式下,售货机升降接货系统易因启停过程中加速度突变产生冲击,导致系统运行不平稳。针对这一问题,文中对传统升降系统加减速控制策略进行改进,加入前馈和微分负反馈,提出一种S型速度曲线控制算法。根据路径规划判别条... 在传统三闭环控制方式下,售货机升降接货系统易因启停过程中加速度突变产生冲击,导致系统运行不平稳。针对这一问题,文中对传统升降系统加减速控制策略进行改进,加入前馈和微分负反馈,提出一种S型速度曲线控制算法。根据路径规划判别条件将S型速度曲线分为七段式、六段式和四段式3种,并给出各路径约束条件下的参数求解方法和具体执行流程。将该算法运用到升降控制系统中进行仿真和实际工况测试,实验结果表明,与传统三闭环控制相比,文中所提控制策略可以提高售货机升降系统运行的平稳性,减小冲击,使速度曲线更加柔和,并能够保持较好的跟踪性能。 展开更多
关键词 加减速控制 S型速度曲线 升降系统 加速度突变 冲击 售货机 控制策略 跟踪性能
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基于混合驱动的分离罗拉运动轨迹规划研究
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作者 张玉香 吕传硕 +1 位作者 杨淑启 王延蒙 《纺织器材》 2024年第4期6-10,共5页
针对当前棉精梳机分离接合机构运动输出特性固定、振动大等问题,分析棉精梳机分离罗拉分离接合工艺,确定分离罗拉运动的位移关键点位置,根据差动轮系的运动规律提出交替驱动和分段驱动2种动力分配方案,并采用三次样条曲线作为交替驱动... 针对当前棉精梳机分离接合机构运动输出特性固定、振动大等问题,分析棉精梳机分离罗拉分离接合工艺,确定分离罗拉运动的位移关键点位置,根据差动轮系的运动规律提出交替驱动和分段驱动2种动力分配方案,并采用三次样条曲线作为交替驱动位移曲线、S型加减速曲线作为分段驱动位移曲线,通过对比分析得到最佳分离罗拉运动轨迹。指出:当设定棉纤维长度为30 mm时,2种驱动方案均能满足分离接合要求;采用混合驱动机构对分离罗拉高速正反转运动进行分解,实现伺服电机混合驱动分离罗拉,其运动性能更佳。 展开更多
关键词 混合驱动 棉精梳机 分离罗拉 差动轮系 三次样条曲线 S型加减速曲线 分离接合
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Manual Order Picking Route Optimization in Distribution Warehouse of Chain Furniture Retail Enterprise
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作者 Yongzhen Zeng Junkun Wang +1 位作者 Ching-Kuei Kao King-Zoo Tang 《American Journal of Operations Research》 2024年第3期105-136,共32页
Due to the effects of the COVID-19 pandemic and the rise of online shopping, the offline sales of IKEA Fuzhou have been declining since 2020. Because the cost of distribution warehouse is a major expense for offline c... Due to the effects of the COVID-19 pandemic and the rise of online shopping, the offline sales of IKEA Fuzhou have been declining since 2020. Because the cost of distribution warehouse is a major expense for offline chain furniture retailers, and the picking process is a key activity in distribution warehouse operations. To reduce the cost of distribution warehouse and alleviate the survival pressure of the offline chain furniture retailers, this paper focuses on optimizing the picking route of the IKEA Fuzhou distribution warehouse. It starts by creating a two-dimensional coordinate system for the storage location of the distribution warehouse using the traditional S-type picking strategy to calculate the distance and time of the sorting route. Then, the problem of optimizing the picking route is then transformed into the travelling salesman problem (TSP), and picking route optimization model is developed using a genetic algorithm to analyze the sorting efficiency and picking route optimization. Results show that the order-picking route using the genetic algorithm strategy is significantly better than the traditional S-type picking strategy, which can improve overall sorting efficiency and operations, reduce costs, and increase efficiency. Thus, this establishes an implementation process for the order-picking path based on genetic algorithm optimization to improve overall sorting efficiency and operations, reduce costs, increase efficiency, and alleviate the survival pressure of pandemic-affected enterprises. 展开更多
关键词 s-shaped Picking Strategy Picking Route Traveling Salesman Problem Genetic Algorithm
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农作物病虫害预警蛇形机器人避障控制研究--基于超声波及红外感器 被引量:2
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作者 黄亚萍 杨冬 《农机化研究》 北大核心 2024年第5期197-200,205,共5页
首先,搭建了农作物病虫害预警蛇形机器人运动学模型,对其被动蜿蜒转弯模式进行详细分析;然后,基于超声波和红外传感器设计了蛇形机器人控制系统,采用Serpenoid曲线策略对蛇形机器人运动姿态进行了研究,并模拟蛇的蜿蜒避障运动。模拟仿... 首先,搭建了农作物病虫害预警蛇形机器人运动学模型,对其被动蜿蜒转弯模式进行详细分析;然后,基于超声波和红外传感器设计了蛇形机器人控制系统,采用Serpenoid曲线策略对蛇形机器人运动姿态进行了研究,并模拟蛇的蜿蜒避障运动。模拟仿真结果表明:蛇形机器人可以自主检测障碍物,通过对移动速度和方向进行控制,能够实现避障处理。 展开更多
关键词 蛇形机器人 病虫害预警 超声波 红外 Serpenoid 避障
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水泵水轮机S特性区能量损失及流动特性研究
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作者 王李科 姚亮 +3 位作者 冯建军 朱国俊 卢金玲 阮辉 《水利学报》 EI CSCD 北大核心 2024年第3期344-354,366,共12页
为了调节电网的稳定性,抽水蓄能电站需要频繁启停和变换工况运行,导致水泵水轮机容易进入S特性区,机组振动增加,并网失败。本文以模型水泵水轮机为研究对象,采用熵产理论详细分析了S特性区不同工况下的能量损失规律,明确了熵产率分布与... 为了调节电网的稳定性,抽水蓄能电站需要频繁启停和变换工况运行,导致水泵水轮机容易进入S特性区,机组振动增加,并网失败。本文以模型水泵水轮机为研究对象,采用熵产理论详细分析了S特性区不同工况下的能量损失规律,明确了熵产率分布与内部流动结构的关系。结果表明:S特性区内近飞逸工况总熵产最大,约为设计工况的5.1倍,脉动熵产占据的比例接近80%,随着流量的减小,转轮熵产占比逐渐降低,活动导叶和尾水管的熵产占比增加。小流量工况转轮进口靠近下环位置首先出现了明显的漩涡,导致了活动导叶出口和转轮进口的高熵产区,随着流量进一步减小,漩涡逐渐向上冠转移,并且切向速度增大,在转轮进口形成挡水环,阻碍水流进入转轮,在无叶区内出现了环状分布的高熵产区。反水泵工况,水流在低压边与逆时针旋转的叶片撞击,导致水流很难进入叶片内部,形成了大尺度的回流涡结构;双列叶栅内充满大量涡结构,导致活动导叶吸力面的熵产率增大,并且向固定导叶传播。 展开更多
关键词 水泵水轮机 S特性 熵产理论 回流涡
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S弯收扩喷管过膨胀状态下流动分离特性研究
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作者 王明新 周莉 +2 位作者 史经纬 张诣 王占学 《推进技术》 EI CAS CSCD 北大核心 2024年第9期71-82,共12页
为了研究S弯收扩喷管过膨胀状态下的流动分离特性,数值模拟了不同落压比(NPR)下S弯收扩喷管内的流动特征。结果表明:在落压比为2.0时,喷管内发生非对称分离,出现非对称的双“λ”激波结构,喷流整体向上偏转,上侧出现限制性流动分离RSS,... 为了研究S弯收扩喷管过膨胀状态下的流动分离特性,数值模拟了不同落压比(NPR)下S弯收扩喷管内的流动特征。结果表明:在落压比为2.0时,喷管内发生非对称分离,出现非对称的双“λ”激波结构,喷流整体向上偏转,上侧出现限制性流动分离RSS,下侧出现自由性流动分离FSS,并产生三维分离涡,喷流出现明显的三维效应。随着落压比从高度过膨胀状态下开始增加,喷管下侧保持FSS不变,喷管上侧RSS逐渐向后移动,直至与外界大气相连,转变为FSS,之后随着落压比增加,上下侧分离结构逐渐对称。推力矢量角随着落压比的增加先增加,后在极小的落压比变化范围内快速降低,直至变为0°,之后保持0°不变。 展开更多
关键词 S弯收扩喷管 过膨胀状态 流动分离 落压比 推力矢量角
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液压成形对液体火箭发动机多层增强S型波纹管结构疲劳寿命的影响
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作者 张涵 张东升 朱卫平 《火箭推进》 CAS 北大核心 2024年第1期113-126,共14页
完善液体火箭发动机燃气摇摆装置中增强S型波纹管组件的疲劳寿命评估方法,提高其疲劳寿命预测精度,是发展可重复使用液体火箭发动机的重要课题之一。针对多层增强S型波纹管,为了计算其液压成形后的实际寿命数据,了解成形工艺对其疲劳寿... 完善液体火箭发动机燃气摇摆装置中增强S型波纹管组件的疲劳寿命评估方法,提高其疲劳寿命预测精度,是发展可重复使用液体火箭发动机的重要课题之一。针对多层增强S型波纹管,为了计算其液压成形后的实际寿命数据,了解成形工艺对其疲劳寿命的影响,提出一种充分考虑成形制备过程对结构不同区域几何构型和材料力学性能造成差异化影响后的波纹管疲劳寿命分析方法。该方法基于成形仿真和材料拉伸试验结果,构建实际波纹管有限元模型并进行三维仿真分析,得到其在高内压和不同摆动工况下结构危险点的循环载荷信息,并根据波纹管结构的低周疲劳失效特点采用子午向应力应变数据,以及经过平均应力应变修正的Manson-Coffin(M-C)公式对波纹管的循环寿命进行估算和对比分析。结果表明:波纹管疲劳寿命薄弱点位置和大小均与循环摆角有关;在预测计算中考虑液压成形作用影响更接近实际场景,所得结构疲劳寿命大小和所在区域均与理论模型值存在差异,在结构设计、优化和健康监测中不应忽视其影响。 展开更多
关键词 重复使用液体火箭发动机 增强S型波纹管 疲劳寿命 液压成形
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多因素影响下的S型管道冲刷腐蚀速率分析
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作者 马忠贞 张友军 +1 位作者 吕雪飞 甘树坤 《吉林化工学院学报》 CAS 2024年第1期43-50,共8页
S型管道应用于输运过程中的复杂地形,在上下游弯头处,会形成不同程度的冲刷腐蚀,造成安全隐患。为分析其腐蚀影响因素,建立S型管道腐蚀模型,采用ANSYS的Workbench平台搭建Fluent模块对不同影响因素下的腐蚀模型进行研究,创建数据传输,... S型管道应用于输运过程中的复杂地形,在上下游弯头处,会形成不同程度的冲刷腐蚀,造成安全隐患。为分析其腐蚀影响因素,建立S型管道腐蚀模型,采用ANSYS的Workbench平台搭建Fluent模块对不同影响因素下的腐蚀模型进行研究,创建数据传输,进而研究流体在流入弯管后各因素与冲蚀速率的关系。结果表明,S型管道冲刷腐蚀受到多因素的影响,尤其是下游弯头处的冲刷腐蚀更为明显。适当减小颗粒物直径、颗粒物质量流量,增大管径和弯径比可以减缓腐蚀及减小腐蚀区域。研究可为管道安全稳定运行提供理论依据。 展开更多
关键词 DPM S型管 冲刷腐蚀 腐蚀速率 数值模拟
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Optimization of endwall contouring in axial compressor S-shaped ducts 被引量:8
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作者 Jin Donghai Liu Xiwu +1 位作者 Zhao Weiguang Gui Xingmin 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第4期1076-1086,共11页
This paper presents a numerical investigation of the potential aerodynamic benefits of using endwall contouring in a fairly aggressive duct with six struts based on the platform for endwall design optimization.The pla... This paper presents a numerical investigation of the potential aerodynamic benefits of using endwall contouring in a fairly aggressive duct with six struts based on the platform for endwall design optimization.The platform is constructed by integrating adaptive genetic algorithm(AGA), design of experiments(DOE), response surface methodology(RSM) based on the artificial neural network(ANN), and a 3D Navier–Stokes solver.The visual analysis method based on DOE is used to define the design space and analyze the impact of the design parameters on the target function(response).Optimization of the axisymmetric and the non-axisymmetric endwall contouring in an S-shaped duct is performed and evaluated to minimize the total pressure loss.The optimal ducts are found to reduce the hub corner separation and suppress the migration of the low momentum fluid.The non-axisymmetric endwall contouring is shown to remove the separation completely and reduce the net duct loss by 32.7%. 展开更多
关键词 Adaptive genetic algorithm(AGA) Artificial neural network(ANN) Corner separation Design of experiments(DOE) Endwall contouring OPTIMIZATION Response surfacemethodology (RSM) s-shaped duct
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