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Wind pressure distribution variation law and interference effect of heliostats 定日镜风压分布变化规律及干涉效应
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-08 DOI: 10.21595/jve.2023.23251
Xuan Li, Anmin Jiang, Yanchen Dong, Q. Xiong, Feifei Wang
The heliostat is different from the ordinary low building because of the special shape of the heliostat. The wind tunnel pressure test is carried out the model of heliostats in the range of azimuth angles are between 0° to 180° and the range of elevation angles are between 0° to 90. The wind pressure time history of each measuring point on the mirror panel are obtained. On this basis, the mean wind pressure distribution of the mirror panel under typical working conditions is obtained, and then the maximum (minimum) value of the mean wind pressure under all working conditions and corresponding working conditions and measuring points are obtained. Then 10 representative measuring points are selected to study the variation law of wind pressure with wind direction angle and pitch angle respectively, and then the variation law of the mean wind pressure of 10 measuring points under all working conditions is obtained. Finally, the interference effect of the mean wind pressure of heliostats is studied, and the variation law of the interference effect of the mean wind pressure is obtained, and the maximum value, minimum value and corresponding working conditions of the interference effect are obtained. The results show that the maximum value of the mean wind pressure of heliostats under all working conditions is appeared at the measurement point of the lower edge of the mirror panel and on working condition 15-60 (wind direction angle - elevation angle), and the minimum value is appeared at the measurement point of the upper left corner of the mirror panel and on working condition 150-20. The variation law of the mean wind pressure of 10 measuring points under all working conditions is similar, and the position of measuring points has little effect on the variation law of the mean wind pressure under all working conditions. Only the working condition of the maximum value and minimum value are affected by the position of the measuring points. The mean wind pressure distribution under the most unfavorable working condition of heliostats is obtained, the maximum (minimum) value of the interference effect and corresponding working conditions are obtained. Which can be a reference for structural design and research.
由于定日镜的特殊形状,定日镜不同于普通的低矮建筑。对定日镜模型进行了风洞压力试验,定日镜的方位角范围在0°至180°之间,仰角范围在0度至90°之间。获得镜面板上每个测量点的风压时间历程。在此基础上,得到了镜面板在典型工况下的平均风压分布,进而得到了所有工况下以及相应工况和测点下平均风压的最大(最小)值。然后选取10个具有代表性的测点,分别研究风压随风向角和桨距角的变化规律,得到10个测点在所有工况下的平均风压变化规律。最后,研究了定日镜平均风压的干扰效应,得到了平均风压干扰效应的变化规律,得到了干扰效应的最大值、最小值及相应的工况。结果表明,定日镜在所有工况下的平均风压最大值出现在镜板下边缘的测量点和工况15-60(风向角-仰角),最小值出现在镜面左上角的测量点,工况150-20。10个测点在所有工况下的平均风压变化规律相似,测点的位置对所有工况下平均风压的变化规律影响不大。测量点的位置只影响最大值和最小值的工作条件。得到了定日镜最不利工况下的平均风压分布,得到了干扰效应的最大(最小)值和相应的工况。可供结构设计和研究参考。
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引用次数: 0
Gabor wavelet transform combined with area CNN in appearance intelligent detection of stayed cables Gabor小波变换与区域CNN相结合在斜拉索外观智能检测中的应用
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-08 DOI: 10.21595/jve.2023.23231
Zhiqiang Li
The major structure for transmitting forces in a cable-stayed bridge is the stay cable. If the stay cable system fails, the whole bridge will collapse. At present, there is no very mature technical means for the detection of bridge cables. The most common method is for workers to perform regular manual inspection and replacement of cables. Although the defect condition of the cable can be detected to a certain extent, the real-time monitoring of its health cannot be realized. Therefore, the research used the median filter, mean standardization method and Retinex algorithm to preprocess the image data. And after extracting the stay cable picture’s macroscopic characteristics using the Gabor wavelet transform, it implemented image segmentation using the OTSU approach. The obtained feature images were applied to the Faster Regional Convolution Neural Network (RCNN) recognition model to detect microscopic defects. During the research, the training efficiency of traditional Convolution Neural Network (CNN) was not high. Therefore, Faster RCNN built a cable defect recognition model. Based on this, the research built an intelligent detection model for apparent defects of stay cables based on Gabor wavelet transform and improved RCNN. Through the experimental analysis, the model built for the study has a recognition accuracy rate of 94.14 %, which can achieve dynamic bridge health monitoring and instantly identify the condition of the stay cables, and maintain the safety of the bridge.
斜拉桥中传递力的主要结构是斜拉索。如果斜拉索系统发生故障,整座桥就会倒塌。目前,对桥梁电缆的检测还没有非常成熟的技术手段。最常见的方法是工人定期手动检查和更换电缆。虽然可以在一定程度上检测电缆的缺陷状况,但无法实现对其健康状况的实时监测。因此,本研究采用中值滤波器、均值标准化方法和Retinex算法对图像数据进行预处理。在利用Gabor小波变换提取斜拉索图像的宏观特征后,利用OTSU方法实现了图像分割。将获得的特征图像应用于快速区域卷积神经网络(RCNN)识别模型,以检测微观缺陷。在研究过程中,传统卷积神经网络(CNN)的训练效率并不高。因此,Faster RCNN建立了一个电缆缺陷识别模型。在此基础上,建立了基于Gabor小波变换和改进的RCNN的斜拉索外观缺陷智能检测模型。通过实验分析,为研究建立的模型识别准确率为94.14%,可以实现桥梁健康动态监测,即时识别斜拉索的状况,维护桥梁的安全。
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引用次数: 0
Study of vibration frequency-fatigue strength action of 6061-T6 aluminum alloy during fillet welding 6061-T6铝合金角焊振动频率疲劳强度作用研究
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-08 DOI: 10.21595/jve.2023.23230
Jingyu Lu, Tingqi Qiu, Zhanli Chen, Wanze Zhang, Minglong Wu, Chuanzhi Du
The research mainly focuses on the fatigue strength characteristics of 6061-T6 aluminum alloy fillet welds under different vibration frequencies. Firstly, by introducing Stress Life Curve (S-N Curve) and Probability Stress Life Curve (P-S-N Curve), the external vibration stress effects of the main load-bearing points in the stress environment of welded joints are analyzed. Subsequently, a vibration test control system is designed to analyze the relationship between vibration frequency and fatigue strength through nominal stress analysis and hot spot stress analysis. The research findings revealed that under the nominal stress analysis method, the P-S-N fitting curve showed a declining trend with an increase in fatigue life for stress variation curves with survival rates of 50 %, 95 %, and 97.7 % at vibration frequencies of 57.5 Hz, 67.5 Hz, and 77.5 Hz. At the same survival rate stress conditions, the fatigue life variation formed by resonance frequency was smaller, and the fatigue life in the resonance state was relatively lower. There is a certain correlation between vibration frequency and fatigue strength, with resonance frequency corresponding to relatively low fatigue life. This research result helps to reveal the fatigue behavior of 6061-T6 aluminum alloy fillet welds under different vibration stresses, providing a reference for the structural safety design of aluminum alloy components.
主要研究6061-T6铝合金角焊缝在不同振动频率下的疲劳强度特性。首先,通过引入应力-寿命曲线(S-N曲线)和概率应力-生命曲线(P-S-N曲线),分析了焊接接头应力环境中主要受力点的外部振动应力效应。随后,设计了振动试验控制系统,通过名义应力分析和热点应力分析,分析振动频率与疲劳强度之间的关系。研究结果表明,在标称应力分析方法下,应力变化曲线的P-S-N拟合曲线随着疲劳寿命的增加而呈下降趋势,在57.5Hz、67.5Hz和77.5Hz的振动频率下,存活率分别为50%、95%和97.7%,共振频率形成的疲劳寿命变化较小,共振状态下的疲劳寿命相对较低。振动频率与疲劳强度之间存在一定的相关性,共振频率对应相对较低的疲劳寿命。该研究结果有助于揭示6061-T6铝合金角焊缝在不同振动应力下的疲劳行为,为铝合金构件的结构安全设计提供参考。
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引用次数: 0
Fuel consumption of a wheel loader with power reflux hydraulic transmission system 动力回流液压传动轮式装载机的燃油消耗
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-06 DOI: 10.21595/jve.2023.22980
Huan Wang, Shuaishuai Ge, Dong Guo, Y. Jiang
The world is facing a limited supply of fossil fuel resources and stringent environmental constraints. Therefore, it is very important to develop advanced technologies to improve vehicle fuel economy, especially for construction vehicles, which have large engine displacements and poor emission characteristics. The majority of these vehicles use hydraulic mechanical transmission in the power train in order to improve maneuverability. However, a key issue on the hydraulic mechanical transmission is the low-efficiency torque converter. Focusing on this issue, we proposed the power reflux hydraulic transmission system (PRHTS), which is a new continuously variable transmission system. The PRHTS can improve the overall transmission efficiency of the power train by splitting the engine power into mechanical and hydraulic power. Therefore, the PRHTS is a valid solution to reduce the fuel consumption and subsequently decrease emissions from construction vehicles. In order to quantitatively study the effect of using the PRHTS on improving the fuel economy for construction vehicles, a wheel loader coupled with the PRHTS is modeled, and numerical simulation is conducted under the wheel loader driving condition. The simulation results show that the total fuel consumption of the wheel loader coupled with PRHTS is reduced by 3.39 % compared with that of the original wheel loader.
世界正面临着化石燃料资源供应有限和严格的环境限制。因此,开发先进的技术来提高车辆的燃油经济性非常重要,尤其是对于发动机排量大、排放特性差的工程车辆。这些车辆中的大多数在动力传动系中使用液压机械传动,以提高操纵性。然而,液力机械变速器的一个关键问题是低效变矩器。针对这一问题,我们提出了动力回流液压传动系统(PRHTS),这是一种新型的无级变速传动系统。PRHTS可以通过将发动机功率分为机械功率和液压功率来提高动力传动系的整体传动效率。因此,PRHTS是一种有效的解决方案,可以降低燃料消耗,从而减少建筑车辆的排放。为了定量研究PRHTS在提高工程车辆燃油经济性方面的作用,建立了与PRHTS耦合的轮式装载机模型,并在轮式装载机驱动条件下进行了数值模拟。仿真结果表明,与原轮式装载机相比,采用PRHTS的轮式装载机总油耗降低了3.39%。
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引用次数: 0
Experimental analysis on the structural seismic behavior of steel frame-precast steel reinforced concrete (SRC) infill wall with lateral force resisting 钢框架-预制钢筋混凝土(SRC)填充墙结构抗侧力抗震性能试验分析
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-03 DOI: 10.21595/jve.2023.23092
Xiaohui Wang, Hui Zhang, Xiaolong Hu
The structural seismic performance of steel frame-precast steel reinforced concrete (SRC) infill wall with lateral force resisting is analyzed, and the structural strength of steel frame-precast SRC infill wall with lateral force resisting is improved. The structural seismic performance optimization model of SRC lateral force resisting wall based on buckling restrained brace is proposed. Through the finite element simulation software, the seismic performance and response results of ordinary steel frames, buckling restrained braced steel frames and a relatively new type of sacrificial-energy dissipation braced steel frames under earthquake are compared and analyzed to demonstrate the applicability and performance advantages of sacrificial-energy dissipation braced steel frames in the steel frame braced structure system. Under the action of horizontal earthquake, the supporting members experience reciprocating axial tension and compression cycles, which dissipate a large amount of seismic energy input into the structure. Therefore, the buckling restraint support method can be used in the structure to improve the support strength. Under horizontal reciprocating load action of earthquake, the ability to consume seismic energy through self-hysteresis of the brace is poor. Experimental research shows that, the unbalanced force formed in the beam of the frame beam under seismic action will form a plastic hinge at the beam end at both ends of the frame beam. Especially when the brace is buckling unstable and the stiffness of the frame beam is small, the plastic hinge effect at the beam end is significant. This phenomenon may cause damage to the frame beam or even local floor subsidence. The buckling restraint support has a full hysteresis area under axial tension and compression, and its mechanical performance is excellent. It is obviously superior to ordinary steel bracing in energy dissipation capacity and seismic performance. It can accurately predict the bearing capacity of reinforced concrete under strong earthquake, and the energy dissipation distribution is more in line with the requirements of “energy seismic design method”.
分析了钢框架-预制型钢骨混凝土(SRC)填充墙的结构抗震性能,提高了钢框架预制型钢混凝土填充墙的抗侧力结构强度。提出了基于屈曲约束支撑的SRC抗侧力墙结构抗震性能优化模型。通过有限元仿真软件对普通钢框架的抗震性能和响应结果进行了分析,对屈曲约束支撑钢框架和一种比较新型的牺牲耗能支撑钢框架在地震作用下进行了比较分析,论证了牺牲耗能支撑框架在钢框架支撑结构体系中的适用性和性能优势。在水平地震作用下,支撑构件经历往复的轴向拉压循环,耗散了输入结构的大量地震能量。因此,可以在结构中采用屈曲约束支撑方法来提高支撑强度。在地震的水平往复荷载作用下,支架通过自滞后消耗地震能量的能力较差。试验研究表明,在地震作用下,框架梁的梁中形成的不平衡力会在框架梁两端的梁端形成塑性铰。特别是当支撑屈曲不稳定且框架梁刚度较小时,梁端塑性铰效应显著。这种现象可能会导致框架梁损坏,甚至局部地面沉降。屈曲约束支座在轴向拉压作用下具有全滞后区,力学性能优异。其耗能能力和抗震性能明显优于普通钢支撑。它可以准确地预测钢筋混凝土在强烈地震下的承载力,耗能分布更符合“能量抗震设计方法”的要求。
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引用次数: 0
Determining tunnel stability across fault zones under seismic loading based on load/unload response ratio theory 基于荷载/卸载响应比理论确定地震作用下跨断裂带隧道稳定性
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-03 DOI: 10.21595/jve.2023.23284
Qiang Hui, F. Gao, Xukai Tan, Dongmei You
Geological faults impair tunnel stability during earthquakes. This study establishes a tunnel dynamic stability evaluation index based on load/unload response ratio (LURR) theory. It considers a seismic wave as a load/unload parameter and tunnel structure strain response as a response parameter. The rationale behind this evaluation index and the factors affecting tunnel stability across fault zones under seismic conditions are investigated. Compared to the traditional dynamic instability criterion, the LURR accurately measures the degree of structural deviation from the steady state and better determines the potential destabilization region of the structure. As the peak value of the input seismic wave increases, the LURRs of the more unstable parts increase, while the LURRs of the stable parts remain unchanged. According to LURR theory, the size of the range affected by the fault on the tunnel during an earthquake depends mainly on inherent fault properties (i.e., the dip angle, strike, and thickness), independent of the earthquake intensity. Because the LURR can theoretically be infinite, its dynamic instability threshold cannot be determined accurately.
地震时,地质断层会破坏隧道的稳定性。本研究建立了基于荷载/卸载响应比(LURR)理论的隧道动力稳定性评价指标。将地震波作为荷载/卸载参数,隧道结构应变响应作为响应参数。研究了该评价指标的基本原理和地震条件下影响断裂带隧道稳定性的因素。与传统的动力失稳判据相比,LURR能准确地测量结构偏离稳态的程度,更好地确定结构的潜在失稳区域。随着输入地震波峰值的增大,较不稳定部分的lurr增大,而稳定部分的lurr保持不变。根据LURR理论,地震时断层对隧道的影响范围大小主要取决于断层的固有性质(即断层的倾角、走向和厚度),而与地震烈度无关。由于LURR理论上可以是无穷大的,因此无法准确确定其动态不稳定阈值。
{"title":"Determining tunnel stability across fault zones under seismic loading based on load/unload response ratio theory","authors":"Qiang Hui, F. Gao, Xukai Tan, Dongmei You","doi":"10.21595/jve.2023.23284","DOIUrl":"https://doi.org/10.21595/jve.2023.23284","url":null,"abstract":"Geological faults impair tunnel stability during earthquakes. This study establishes a tunnel dynamic stability evaluation index based on load/unload response ratio (LURR) theory. It considers a seismic wave as a load/unload parameter and tunnel structure strain response as a response parameter. The rationale behind this evaluation index and the factors affecting tunnel stability across fault zones under seismic conditions are investigated. Compared to the traditional dynamic instability criterion, the LURR accurately measures the degree of structural deviation from the steady state and better determines the potential destabilization region of the structure. As the peak value of the input seismic wave increases, the LURRs of the more unstable parts increase, while the LURRs of the stable parts remain unchanged. According to LURR theory, the size of the range affected by the fault on the tunnel during an earthquake depends mainly on inherent fault properties (i.e., the dip angle, strike, and thickness), independent of the earthquake intensity. Because the LURR can theoretically be infinite, its dynamic instability threshold cannot be determined accurately.","PeriodicalId":49956,"journal":{"name":"Journal of Vibroengineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44139603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of the flow state and static performance of smooth annular liquid seals 光滑环形液体密封的流动状态和静态性能评价
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-03 DOI: 10.21595/jve.2023.23283
Zhongjie Yang, Jinyong Feng, Jingyu Wan, Xiaobin Yu, Zhang He, Wanfu Zhang
The static fluid-induced force and stiffness coefficient of the smooth annular seal directly affect the rotor system stability. In this paper, a computational fluid dynamics method is applied to investigate the flow characteristics of a smooth annular seal for various eccentricities, discharge/supply pressures and rotational speeds under different flow conditions (laminar, transition, and turbulent flow). The influence factors and formation mechanism of the static instability in the smooth annular liquid seal are analyzed. Results show that laminar flow dominates the flow state at a rotational speed of ω= 2000 rpm. As the rotational speeds increase, the transition flow (2000-7000 rpm) gradually transits to the turbulent regime (ω> 7000 rpm). The direct static stiffness decreases first and then increases from laminar to transition flow state, and the viscosity effect is the dominant factor. For transition and turbulent flow with high eccentricities (ε= 80 %), the dominant viscous effect and inertial effect lead to the negative radial force and negative direct static stiffness coefficients. The smooth annular liquid seal shows best performance in the laminar flow and worst performance in the turbulent flow.
光滑环形密封的静态流体诱导力和刚度系数直接影响转子系统的稳定性。在本文中,应用计算流体动力学方法研究了在不同流动条件(层流、过渡和湍流)下,光滑环形密封在各种偏心度、排放/供应压力和转速下的流动特性。分析了光滑环形液封静态失稳的影响因素及形成机理。结果表明,在ω=2000rpm的转速下,层流主导着流动状态。随着转速的增加,过渡流(2000-7000 rpm)逐渐过渡到湍流状态(ω>7000 rpm)。从层流状态到过渡流状态,直接静刚度先减小后增大,粘性效应是主要因素。对于具有高偏心率(ε=80%)的过渡和湍流,主要的粘性效应和惯性效应导致负径向力和负直接静态刚度系数。光滑环形液体密封在层流中表现出最佳性能,在湍流中表现出最差性能。
{"title":"Evaluation of the flow state and static performance of smooth annular liquid seals","authors":"Zhongjie Yang, Jinyong Feng, Jingyu Wan, Xiaobin Yu, Zhang He, Wanfu Zhang","doi":"10.21595/jve.2023.23283","DOIUrl":"https://doi.org/10.21595/jve.2023.23283","url":null,"abstract":"The static fluid-induced force and stiffness coefficient of the smooth annular seal directly affect the rotor system stability. In this paper, a computational fluid dynamics method is applied to investigate the flow characteristics of a smooth annular seal for various eccentricities, discharge/supply pressures and rotational speeds under different flow conditions (laminar, transition, and turbulent flow). The influence factors and formation mechanism of the static instability in the smooth annular liquid seal are analyzed. Results show that laminar flow dominates the flow state at a rotational speed of ω= 2000 rpm. As the rotational speeds increase, the transition flow (2000-7000 rpm) gradually transits to the turbulent regime (ω> 7000 rpm). The direct static stiffness decreases first and then increases from laminar to transition flow state, and the viscosity effect is the dominant factor. For transition and turbulent flow with high eccentricities (ε= 80 %), the dominant viscous effect and inertial effect lead to the negative radial force and negative direct static stiffness coefficients. The smooth annular liquid seal shows best performance in the laminar flow and worst performance in the turbulent flow.","PeriodicalId":49956,"journal":{"name":"Journal of Vibroengineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42817311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aerodynamic characteristic analysis of wind turbine blades based on CSA-KJ airfoil optimization design 基于CSA-KJ翼型优化设计的风力机叶片气动特性分析
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-02 DOI: 10.21595/jve.2023.23255
Yiqing Xu, Jianping Zhang, Ming Liu, Pengju Zhang, Liquan Wang
In order to enable the offshore wind farm to produce electric energy efficiently, stably and economically, the optimization method of CSA-KJ airfoil is proposed, and the optimized CSA-KJ4412 airfoil is obtained, and the aerodynamic characteristics of the airfoil are compared and analyzed. Combined with Wilson method, the high-power CSAKJ4412-08 wind turbine blade is designed, the flow field characteristics of the blade under different working conditions are simulated and analyzed, and its power is verified. The results show that compared with the NACA4412 airfoil, the average lift-drag ratio coefficient and the maximum value of the CSA-KJ4412 airfoil increase. Meanwhile, the pressure distribution rises, and the aerodynamic characteristic is better. The fluid around CSAKJ4412-08 blade at different attack angles is attached to the blade surface tightly for adhesive flow, and no stall phenomenon is identified. The pressure on the suction and pressure surfaces for the optimized CSAKJ4412-08 blade shows an opposite trend as the wingspan in-creases, leading to an increase in the pressure difference between the upper and lower surfaces, thereby improving the lift of the blade. In the range of –30° to 30° attack angle, the power of CSAKJ4412-08 blade increases first and then decreases as the attack angle rises, and the ratio of the maximum power to the rated value reaches 71.38 %, indicating that the optimized CSAKJ4412-08 blade exhibits better aerodynamic characteristics. The relevant results can provide technical reference for the optimal design of wind turbine blades.
为了使海上风电场高效、稳定、经济地发电,提出了CSA-KJ翼型的优化方法,得到了优化后的CSA-KJ4412翼型,并对该翼型的气动特性进行了比较分析。结合Wilson方法,设计了大功率CSAKJ4412-08风力机叶片,对叶片在不同工况下的流场特性进行了仿真分析,并对其功率进行了验证。结果表明:与NACA4412翼型相比,CSA-KJ4412翼型的平均升阻比系数和最大值均有所增大;同时,压力分布增大,气动特性得到改善。CSAKJ4412-08叶片周围不同攻角的流体紧密附着在叶片表面进行粘接流动,未发现失速现象。优化后的CSAKJ4412-08叶片吸力面和压力面压力随翼展增大呈相反趋势,导致上下表面压差增大,从而提高叶片升力。在-30°~ 30°攻角范围内,随着攻角的增大,CSAKJ4412-08叶片的功率先增大后减小,最大功率与额定值的比值达到71.38%,说明优化后的CSAKJ4412-08叶片具有较好的气动特性。研究结果可为风力机叶片的优化设计提供技术参考。
{"title":"Aerodynamic characteristic analysis of wind turbine blades based on CSA-KJ airfoil optimization design","authors":"Yiqing Xu, Jianping Zhang, Ming Liu, Pengju Zhang, Liquan Wang","doi":"10.21595/jve.2023.23255","DOIUrl":"https://doi.org/10.21595/jve.2023.23255","url":null,"abstract":"In order to enable the offshore wind farm to produce electric energy efficiently, stably and economically, the optimization method of CSA-KJ airfoil is proposed, and the optimized CSA-KJ4412 airfoil is obtained, and the aerodynamic characteristics of the airfoil are compared and analyzed. Combined with Wilson method, the high-power CSAKJ4412-08 wind turbine blade is designed, the flow field characteristics of the blade under different working conditions are simulated and analyzed, and its power is verified. The results show that compared with the NACA4412 airfoil, the average lift-drag ratio coefficient and the maximum value of the CSA-KJ4412 airfoil increase. Meanwhile, the pressure distribution rises, and the aerodynamic characteristic is better. The fluid around CSAKJ4412-08 blade at different attack angles is attached to the blade surface tightly for adhesive flow, and no stall phenomenon is identified. The pressure on the suction and pressure surfaces for the optimized CSAKJ4412-08 blade shows an opposite trend as the wingspan in-creases, leading to an increase in the pressure difference between the upper and lower surfaces, thereby improving the lift of the blade. In the range of –30° to 30° attack angle, the power of CSAKJ4412-08 blade increases first and then decreases as the attack angle rises, and the ratio of the maximum power to the rated value reaches 71.38 %, indicating that the optimized CSAKJ4412-08 blade exhibits better aerodynamic characteristics. The relevant results can provide technical reference for the optimal design of wind turbine blades.","PeriodicalId":49956,"journal":{"name":"Journal of Vibroengineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42856102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic interactions of tram-turnout coupling system in embedded turnout area 嵌入式道岔区有轨电车-道岔耦合系统的动力相互作用
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-02 DOI: 10.21595/jve.2023.23203
Lihua Zhai, Hongyu Wan, S. Sun
Embedded turnout is one of the key facilities in the embedded track network of modern tram systems. In this study, the damping performance and track stiffness of an embedded turnout are tested on site. A multi-rigid body dynamics model of the tram and a finite-element dynamics model of the embedded turnout are established, and the two models are coupled based on the wheel-rail contact theory for the turnout area. Next, the dynamic responses of the tram passing through the embedded turnout are analyzed. The results show that the embedded turnout has favorable damping performance. The high stiffness of variable section rails at the switch and frog would lead to an increase in the wheel-rail dynamic force. When the tram passes through the embedded turnout, the wheel-rail vertical force reaches maximum values of 106.3 and 35.2 kN at the frog and switch, respectively; the maximum wheel derailment coefficient and wheel weight reduction rate are 0.49 and 0.57, respectively, which are within the safety limit specified in the Standards; the maximum lateral and vertical vibration accelerations of the tram body are 0.38 and 0.71 m/s2, respectively, satisfying the comfort requirements; the wheel–rail wear work at the switch is greater than that at the frog.
嵌入式道岔是现代有轨电车系统嵌入式轨道网的关键设施之一。在本研究中,对嵌入式道岔的阻尼性能和轨道刚度进行了现场测试。基于道岔区轮轨接触理论,建立了有轨电车多刚体动力学模型和嵌入式道岔有限元动力学模型,并将两者耦合。其次,对有轨电车通过埋置道岔的动力响应进行了分析。结果表明,该道岔具有良好的阻尼性能。道岔和辙叉处变截面钢轨的高刚度会导致轮轨动力的增加。当有轨电车通过预埋道岔时,辙叉和道岔处的轮轨垂直力分别达到106.3和35.2kN的最大值;最大车轮脱轨系数为0.49,车轮减重率为0.57,均在本标准规定的安全限值内;车体最大横向和垂直振动加速度分别为0.38和0.71m/s2,满足舒适性要求;道岔处的轮轨磨耗功大于辙叉处的轮轨磨损功。
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引用次数: 0
Effect of excitation vibration on mechanical property and stress corrosion resistance of cast steel 激振对铸钢力学性能和抗应力腐蚀性能的影响
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-01 DOI: 10.21595/jve.2023.23125
Ruiying Shao, Hongjun Wang, Kun-lin Lu, Juan Song
Cast steel parts can realize rapid prototyping effectively, which is suitable for complex structural design. However, due to the large residual stress, the problem of mechanical property degradation is more obvious. In order to solve this problem, a high temperature excitation vibration treatment scheme is proposed in this paper. By applying different excitation frequencies and impact forces, the effects of mechanical properties and stress corrosion properties are studied and verified. Based on the finite element software ANSYS, the modal shape and resonant frequency of the cast steel parts are obtained, and verified by the sweep frequency module in the excitation vibration system. According to the characteristics of modal shape, five typical detection paths are set, and stress sensors are arranged every 200 mm. In order to obtain the specific effects of excitation frequency and impact force amplitude on mechanical properties, nine parts samples were prepared on the same production line according to the matching requirements of test parameters. In addition, the main external parameters that remain unchanged during vibration excitation are set as initial 750 ℃ and vibration excitation time of 60 s, which can fully affect the effect of austenite transformation. Keeping the synchronization of test parameters in different samples, the distribution rules of residual stress under different excitation frequencies and forces are obtained and analyzed. In the aspect of mechanical properties, the microstructure, hardness, yield strength and tensile strength of the specimens subjected to vibration were compared and analyzed. In the aspect of stress corrosion performance research, stress corrosion cracking test was carried out in weak acid environment to obtain the tensile stress curve and fracture morphology of the specimen. The results show that the excitation vibration at high temperature can effectively eliminate the residual stress of cast steel parts, but the increase of excitation frequency does not correspond to the effect of residual stress elimination. When the exciting force exceeds a certain value, the stress relief effect cannot be further improved. Excitation vibration can reduce the internal hardness of cast steel parts to a certain extent, and improve the yield strength and tensile strength. At the same time, it has a positive role in promoting the improvement of stress corrosion resistance.
铸钢件可以有效地实现快速成型,适用于复杂的结构设计。然而,由于残余应力较大,力学性能退化的问题更加明显。为了解决这一问题,本文提出了一种高温激振处理方案。通过施加不同的激励频率和冲击力,研究和验证了机械性能和应力腐蚀性能的影响。基于有限元软件ANSYS,得到了铸钢件的模态形状和共振频率,并通过激振系统中的扫频模块进行了验证。根据模态形状的特点,设置了五个典型的检测路径,每200mm布置一个应力传感器。为了获得激励频率和冲击力振幅对机械性能的具体影响,根据测试参数的匹配要求,在同一条生产线上制备了九个零件样品。此外,激振过程中保持不变的主要外部参数设置为初始750℃和激振时间60s,这可以充分影响奥氏体转变的效果。在保持不同样品试验参数同步的情况下,获得并分析了不同激励频率和激励力下残余应力的分布规律。在力学性能方面,对振动试样的微观结构、硬度、屈服强度和抗拉强度进行了比较分析。在应力腐蚀性能研究方面,在弱酸环境下进行了应力腐蚀开裂试验,得到了试样的拉应力曲线和断裂形态。结果表明,高温激振能有效消除铸钢件的残余应力,但激振频率的增加与消除残余应力的效果不一致。当激振力超过一定值时,应力消除效果无法进一步提高。激振可以在一定程度上降低铸钢件的内部硬度,提高屈服强度和抗拉强度。同时,对提高应力腐蚀抗力具有积极的促进作用。
{"title":"Effect of excitation vibration on mechanical property and stress corrosion resistance of cast steel","authors":"Ruiying Shao, Hongjun Wang, Kun-lin Lu, Juan Song","doi":"10.21595/jve.2023.23125","DOIUrl":"https://doi.org/10.21595/jve.2023.23125","url":null,"abstract":"Cast steel parts can realize rapid prototyping effectively, which is suitable for complex structural design. However, due to the large residual stress, the problem of mechanical property degradation is more obvious. In order to solve this problem, a high temperature excitation vibration treatment scheme is proposed in this paper. By applying different excitation frequencies and impact forces, the effects of mechanical properties and stress corrosion properties are studied and verified. Based on the finite element software ANSYS, the modal shape and resonant frequency of the cast steel parts are obtained, and verified by the sweep frequency module in the excitation vibration system. According to the characteristics of modal shape, five typical detection paths are set, and stress sensors are arranged every 200 mm. In order to obtain the specific effects of excitation frequency and impact force amplitude on mechanical properties, nine parts samples were prepared on the same production line according to the matching requirements of test parameters. In addition, the main external parameters that remain unchanged during vibration excitation are set as initial 750 ℃ and vibration excitation time of 60 s, which can fully affect the effect of austenite transformation. Keeping the synchronization of test parameters in different samples, the distribution rules of residual stress under different excitation frequencies and forces are obtained and analyzed. In the aspect of mechanical properties, the microstructure, hardness, yield strength and tensile strength of the specimens subjected to vibration were compared and analyzed. In the aspect of stress corrosion performance research, stress corrosion cracking test was carried out in weak acid environment to obtain the tensile stress curve and fracture morphology of the specimen. The results show that the excitation vibration at high temperature can effectively eliminate the residual stress of cast steel parts, but the increase of excitation frequency does not correspond to the effect of residual stress elimination. When the exciting force exceeds a certain value, the stress relief effect cannot be further improved. Excitation vibration can reduce the internal hardness of cast steel parts to a certain extent, and improve the yield strength and tensile strength. At the same time, it has a positive role in promoting the improvement of stress corrosion resistance.","PeriodicalId":49956,"journal":{"name":"Journal of Vibroengineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41458042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Journal of Vibroengineering
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