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Vibration characteristics and seismic performance of historical buildings with brick-wood structures 砖木结构历史建筑的振动特性及抗震性能
Q4 ENGINEERING, MECHANICAL Pub Date : 2023-10-07 DOI: 10.21595/jve.2023.23394
Liang Li, Ping Liu, Jianhua Fu, Jianjiang Yang
To explore the vibration characteristics and seismic performance of historical buildings in Tianjin, we conducted on-site vibration testing under ambient vibration on three historical buildings with brick-wood structures in Tianjin. Specifically, we delved into the vibration characteristics and seismic performance of historic buildings with brick-wood structures by establishing the vibration analysis model, performing the theoretical calculations, and conducting seismic performance analysis. The results reveal that 1) the vibration frequencies of historical buildings with brick-wood structures are low, mainly concentrated in 2.0-8.0 Hz, which conforms to the vibration range of general buildings; 2) based on vibration analysis, it is concluded that the structural integrity of these buildings is good and there are no obvious structural defects; 3) the layout and storey height of historical buildings have great impacts on the vibration characteristics and seismic performance. 4) the comprehensive seismic capacity index of three buildings ranges from 0.91 to 1.75. The results of dynamic analysis under ambient vibration are consistent with those of theoretical analysis, providing a basis for preserving and reinforcing historical buildings.
为探讨天津市历史建筑的振动特性及抗震性能,我们对天津市三栋砖木结构历史建筑进行了环境振动下的现场振动试验。具体而言,我们通过建立振动分析模型,进行理论计算,并进行抗震性能分析,深入研究砖木结构历史建筑的振动特性和抗震性能。结果表明:1)砖木结构历史建筑的振动频率较低,主要集中在2.0 ~ 8.0 Hz,符合一般建筑的振动范围;2)基于振动分析,得出结构完整性较好,不存在明显的结构缺陷;3)历史建筑的布局和层高对其振动特性和抗震性能有较大影响。4) 3栋建筑的综合抗震能力指数在0.91 ~ 1.75之间。环境振动作用下的动力分析结果与理论分析结果一致,为历史建筑的保护加固提供了依据。
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引用次数: 0
Full-scale shaking table test on seismic performance of a steel frame with translational-type precast-concrete exterior wall panel 平动式预制混凝土外墙板钢框架抗震性能全尺寸振动台试验
Q4 ENGINEERING, MECHANICAL Pub Date : 2023-10-06 DOI: 10.21595/jve.2023.23378
Jianhua Shi, Fan Zhang, Xuefei Zhao, Wei Tian, Jianbao Li, Jingquan Wang
In order to investigate the deformation behavior, mechanical characteristics of connections, and failure mode of translational precast concrete wall-panels under earthquake loading, a full-scale two-story steel frame model was designed. This test model consisted of 12 precast concrete wall-panels connected with fixed connections at the bottom end and translational-type connections at the top end. This model passed the shaking table testing, and the results demonstrate that the translational-type precast concrete exterior wall panel can ensure the sufficient relative displacement between the wall panel and the main structure under large earthquake loads. It has sufficient capacity to adapt the deformation between the main structure and the wall panels. During the test, localized cracking was observed on the wall panel, while all connections remained in elastic state. The connections between precast concrete exterior wall panels exhibited good performance, that indicates it is an effective tool to protect frame building hangings with exterior wall panels under strong earthquake events.
为了研究平动预制混凝土墙板在地震荷载作用下的变形行为、连接节点力学特征及破坏模式,设计了两层全尺寸钢框架模型。本试验模型由12块预制混凝土墙板组成,底部为固定连接,顶部为平动连接。该模型通过了振动台试验,结果表明平动式预制混凝土外墙板在大地震荷载作用下能保证墙体与主体结构之间有足够的相对位移。它有足够的能力来适应主体结构与墙板之间的变形。试验过程中,墙体出现局部开裂,但所有连接均处于弹性状态。预制混凝土外墙板之间的连接具有良好的性能,表明它是在强震条件下保护框架建筑外墙板的有效工具。
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引用次数: 0
Dynamic response of high and thin rock slope under blasting vibration: a case study 爆破振动作用下高薄岩质边坡的动力响应研究
Q4 ENGINEERING, MECHANICAL Pub Date : 2023-09-25 DOI: 10.21595/jve.2023.23195
Pengchang Sun, Ruize Li
The topography of a thin double-sided rock slope differs greatly from that of a regularly studied single-sided rock slope, which leads to difficulties in investigating the dynamic response of the thin double-sided rock slope. Through a case study, this paper provides a specific prospect on the dynamic response of the high and thin rock slope under blasting vibration. The high and thin rock slope belonging to Chiwan Mountain was selected as the typical case slope. Field monitoring programs for blasting vibration on the case slope were carried out using vibration monitoring systems. The amplitude, frequency, and energy characteristics of the recorded blasting vibration were then concretely identified and examined. The monitoring results were further used to validate the dynamic finite element model developed to explore the effects of blasting vibration frequency and amplitude on the dynamic response of the slope. The dynamic finite element model of the case slope subjected to blasting vibration was established using the software LS-DYNA. According to the monitoring and numerical results, the dynamic response mechanism of the high and thin rock slope under blasting vibration was discussed. The results indicate that the elevation amplification effect of blasting vibration exists on the southern slope from a certain elevation, and the dominant frequencies generally decay with the distance from the blasting source but remain largely the same within a specific elevation range. The blasting vibration frequencies have considerable influence on both the values and distributions of peak particle velocities on the slope while the blasting vibration amplitudes have an impact only on the values of peak particle velocities. The dynamic response of the case slope under blasting vibration results from the joint effects of blasting seismic wave propagation and structural resonance. The research findings may pave an effective way to clearly understand the dynamic response of similar high and thin rock slopes under blasting vibration.
双面薄岩质边坡的地形与常规研究的单面岩质边坡有很大的不同,这给研究双面薄岩质边坡的动力响应带来了困难。通过实例分析,对爆破振动作用下高薄岩质边坡的动力响应进行了具体展望。选取赤湾山高薄岩质边坡作为典型案例边坡。利用振动监测系统对箱体边坡爆破振动进行了现场监测。然后对记录的爆破振动的振幅、频率和能量特征进行了具体识别和检验。利用监测结果验证了建立的动力有限元模型,探讨了爆破振动频率和振幅对边坡动力响应的影响。利用LS-DYNA软件建立了爆破振动作用下箱体边坡的动力有限元模型。根据监测结果和数值计算结果,探讨了爆破振动作用下高薄岩质边坡的动力响应机制。结果表明:在某一高程范围内,爆破振动在南坡存在高程放大效应,主导频率随距离爆破源的远近而衰减,但在一定高程范围内基本保持不变;爆破振动频率对边坡上颗粒速度峰值的取值和分布都有较大影响,而爆破振动幅值仅对颗粒速度峰值的取值有影响。爆破振动作用下箱体边坡的动力响应是爆破地震波传播和结构共振共同作用的结果。研究结果可为清晰认识爆破振动作用下类似高薄岩质边坡的动力响应提供有效途径。
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引用次数: 0
Experimental study and comparative analysis of pitting fault in spur gear system 直齿轮系统点蚀故障的实验研究与对比分析
Q4 ENGINEERING, MECHANICAL Pub Date : 2023-09-14 DOI: 10.21595/jve.2023.23335
Kemajou Herbert Yakeu Happi, Bernard Xavier Tchomeni Kouejou, Alfayo Anyika Alugongo
This paper uses a dynamic six-degree-of-freedom model that considers torsional and lateral motions to predict the impact of pitting on vibration parameters in a spur gearbox for various operating speeds and torque loads. The study examines the dynamic characteristics of a gearbox with localized pitting damage on a single gear tooth using theoretical and experimental approaches. The research analyzes the forced vibrations of a single-stage spur gear system with pitting damage, which includes variations in mesh stiffness, damping, and gear error excitation, to identify symptoms of default. The equation of motion for the rotary gearbox system is established using the Lagrangian method in tandem with Short-Time Fourier Transform (STFT) and frequency-RPM map fault diagnosis. During real-time vibration monitoring, vibration signals are captured via accelerometers and processed in both the time and frequency domains using the LabVIEW data acquisition signal processing package to extract diagnostic information. The experimental findings demonstrate how vibration analysis combined with time-frequency processing can recognize machine conditions even in harsh operational conditions. Moreover, the experimental results indicate a significant similarity with the theoretical analysis and validate the effectiveness of the RPM frequency technique-based pitting detection method, which can be an asset in gear fault monitoring.
本文采用考虑扭转和横向运动的动态六自由度模型,预测了在不同运行速度和扭矩载荷下,点蚀对直齿轮箱振动参数的影响。该研究采用理论和实验方法研究了齿轮箱在单个齿轮齿上局部点蚀损伤的动态特性。该研究分析了具有点蚀损伤的单级直齿齿轮系统的强迫振动,包括啮合刚度、阻尼和齿轮误差激励的变化,以识别违约症状。将拉格朗日方法与短时傅里叶变换(STFT)和频率-转速图故障诊断相结合,建立了旋转齿轮箱系统的运动方程。在实时振动监测过程中,通过加速度计捕获振动信号,并使用LabVIEW数据采集信号处理包在时域和频域进行处理,以提取诊断信息。实验结果表明,振动分析与时频处理相结合,即使在恶劣的运行条件下也能识别出机器的状态。实验结果与理论分析结果吻合较好,验证了基于转速频率技术的点蚀检测方法的有效性,为齿轮故障监测提供了宝贵的技术支持。
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引用次数: 0
Fault diagnosis method for hydro-power plants with Bi-LSTM knowledge graph aided by attention scheme 基于关注方案的Bi-LSTM知识图水电厂故障诊断方法
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-09-08 DOI: 10.21595/jve.2023.23398
Bilei Guo, Yining Wang, Weifeng Pan, Yanlin Sun
In hydro-power systems, the fault of equipment is an important potential threat for the safe production of electricity. Therefore, the automation and intelligence of fault diagnosis becomes the popular issue in the research on hydro-power system. In this paper, a knowledge graph-based method is put forth to diagnose faults occurred in hydro-power systems, since the knowledge graph can store structured and unstructured data for better fault diagnosis and intelligently search the reasons of the faults. First, we model the knowledge graph for hydro-power plants, where the rational path for the fault reason is formulated. Then, the bi-directional long short-term memory (Bi-LSTM) with conditional random field (CRF) is used to extract the entities and relations to the given documents, which record the phenomenon and reasons for the occurred faults. Moreover, the attention scheme is employed in the Bi-LSTM to weigh the closer relationships to improve the diagnosis accuracy. An automatic diagnosis algorithm is developed to improve the diagnosing efficiency by constructing rational paths, with which directive and in-directive factors for occurring faults can be traced. Simulation results reveal that the intelligent search method with a knowledge graph can effectively find the reason, locate the position, and provide useful suggestions for the occurred faults.
在水电系统中,设备故障是影响电力安全生产的重要潜在威胁。因此,故障诊断的自动化和智能化成为水电系统研究的热点问题。本文提出了一种基于知识图的水电系统故障诊断方法,知识图可以存储结构化和非结构化数据,便于故障诊断和智能搜索故障原因。首先,对水电厂的知识图谱进行建模,给出故障原因的合理路径;然后,利用带有条件随机场(CRF)的双向长短期记忆(Bi-LSTM)提取给定文档的实体和关系,记录故障发生的现象和原因。此外,在Bi-LSTM中采用了注意方案来权衡更紧密的关系,以提高诊断的准确性。为了提高诊断效率,提出了一种自动诊断算法,通过构造合理的路径来跟踪故障发生的指示因素和指示因素。仿真结果表明,基于知识图谱的智能搜索方法能够有效地找到故障原因,定位故障位置,并对发生的故障提供有用的建议。
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引用次数: 0
Research on fault diagnosis method of bearing based on parameter optimization VMD and improved DBN 基于参数优化VMD和改进DBN的轴承故障诊断方法研究
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-09-08 DOI: 10.21595/jve.2023.22770
Yingqiang Sun, Zhenzhen Jin
Aiming at the problem that the bearing characteristics are difficult to extract accurately, and the fault diagnosis is difficult. This paper proposed a novel bearing fault diagnosis method with parameter optimization variational mode decomposition (VMD) and particle swarm optimization Deep Belief Networks (PSO-DBN). Firstly, the PSO is applied to optimize the parameter of the VMD and solve the problem of parameter setting of the VMD. Then, to effectively extract the feature information, using the optimized VMD, the original signal is decomposed into intrinsic mode components, and each component's dispersion entropy (DE) value is calculated. Finally, to further improve the accuracy of fault diagnosis, the PSO-DBN model is used to recognize the fault pattern bearing. The results of both experiments are 100 %. The results show that this method can effectively extract bearing fault features and accurately realize fault diagnosis. Compared with other methods, the accuracy of this method is increased by at least 2.08 % and the maximum is increased by 33.33 %.
针对轴承特性难以准确提取、故障诊断困难的问题。提出了一种新的轴承故障诊断方法——参数优化变分模分解(VMD)和粒子群优化深度置信网络(PSO-DBN)。首先,将粒子群算法应用于VMD的参数优化,解决了VMD参数设置问题。然后,为了有效地提取特征信息,使用优化的VMD,将原始信号分解为固有模分量,并计算每个分量的色散熵(DE)值。最后,为了进一步提高故障诊断的准确性,使用PSO-DBN模型对故障模式轴承进行识别。两个实验的结果都是100%。结果表明,该方法能够有效地提取轴承故障特征,准确地实现故障诊断。与其他方法相比,该方法的准确度至少提高了2.08%,最大准确度提高了33.33%。
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引用次数: 0
Automatic vibration control method for grasping end of flexible joint robot 柔性关节机器人抓取端振动的自动控制方法
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-09-07 DOI: 10.21595/jve.2023.23264
Yufang Sun
Because flexible robots have flexible components such as reducers, there are problems of accuracy deviation and end vibration in the process of external interference and trajectory tracking. This leads to the proposal of a Sliding Mode Control Approach Based on RBF Neural Network (SMC-RBF) parameter optimization. This method is mainly applied to reduce the end vibration and running position error of flexible robot. Firstly, the Newton-Euler method is used to establish the dynamic model of robot considering joint flexibility. At the same time, the experiment optimizes the Sliding Mode Control (SMC) method through RBF neural network. The experiments verify the control methods of the two-joint flexible robot and the six-joint flexible robot respectively. In the control of two-joint robot, the maximum tracking curve error of SMC is only about 0.25 rad under the interference of pulse signal; And the recovery time is only about 1 s. In the control of 6-joint robot, the maximum error of RBF-sliding mode control method on XYZ axis is 0.7 mm, 0.25 mm and 1.25 mm respectively; The error on three axes is smaller than that of traditional PD control method. The results demonstrate that the tracking error of the improved mode control is small, the chattering phenomenon of the robot system is weakened as well.
由于柔性机器人具有减速器等柔性部件,在外部干扰和轨迹跟踪过程中存在精度偏差和末端振动问题。为此,提出了一种基于RBF神经网络(SMC-RBF)参数优化的滑模控制方法。该方法主要用于降低柔性机器人的末端振动和运行位置误差。首先,采用牛顿-欧拉方法建立了考虑关节柔性的机器人动力学模型。同时,通过RBF神经网络对滑模控制(SMC)方法进行优化。实验分别验证了两关节柔性机器人和六关节柔性机器人的控制方法。在双关节机器人控制中,在脉冲信号干扰下,SMC的最大跟踪曲线误差仅为0.25 rad左右;恢复时间仅为1 s左右。在六关节机器人的控制中,rbf -滑模控制方法对XYZ轴的最大误差分别为0.7 mm、0.25 mm和1.25 mm;与传统PD控制方法相比,三轴误差较小。结果表明,改进后的模式控制跟踪误差小,机器人系统的抖振现象减弱。
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引用次数: 0
Analysis of the ammunition explosion seismic wave propagation law 弹药爆炸地震波传播规律分析
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-09-03 DOI: 10.21595/jve.2023.23069
F. Shang, Liangquan Wang
The seismic wave generated in the ammunition explosion process is one of the important technical indicators to evaluate the ammunition damage power. It is of great significance to evaluate the ammunition damage power and study the targets damage characteristics. In this study, experimental studies were carried out with TNT explosive mass of 1.25 kg, 5.25 kg, 10.5 kg and 30.75 kg, and the ground vibration velocity time-history curves at different measuring points were obtained. The functional relationship between ground particle vibration acceleration and TNT explosive mass was established by dimensional analysis method, and the functional relationship calculation accuracy was verified by the measured test data. The results show that the particle vibration acceleration peak value is positively correlated with the TNT explosive mass, and negatively correlated with the measuring point distance; The particle vibration acceleration calculation function established by the dimensional analysis method has high fitting accuracy for the existing test data, and can be used to calculate the ammunition explosion ground vibration acceleration peak value. The research results provide a high-precision calculation method for the peak value of explosion seismic wave ground vibration acceleration.
弹药爆炸过程中产生的地震波是评价弹药毁伤威力的重要技术指标之一。对弹药毁伤威力的评估和目标毁伤特性的研究具有重要意义。本研究分别以TNT炸药质量为1.25 kg、5.25 kg、10.5 kg和30.75 kg进行了实验研究,得到了不同测点的地面振动速度时程曲线。采用量纲分析法建立了地面粒子振动加速度与TNT炸药质量的函数关系,并通过实测试验数据验证了函数关系计算的准确性。结果表明:颗粒振动加速度峰值与TNT炸药质量呈正相关,与测点距离负相关;利用量纲分析法建立的粒子振动加速度计算函数对现有试验数据具有较高的拟合精度,可用于计算弹药爆炸地面振动加速度峰值。研究结果为爆炸地震波地面振动加速度峰值的高精度计算提供了一种方法。
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引用次数: 0
Finite element modeling of electric vehicle power battery pack and its influence analysis and test research at body-in-white stage 电动汽车动力电池组有限元建模及其影响分析及白车身试验研究
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-22 DOI: 10.21595/jve.2023.23260
Kefei Wang, Peicheng Shi, Zhendong Zhang
Compared with the design of traditional fuel vehicles, the design of electric vehicles has its uniqueness, consisting mainly in that the body design must be able to adapt to the new power system and its layout. Power battery pack is an important factor affecting the body design of electric vehicles. In order to study the modeling of power battery packs and its impact on body performance, it was proposed to use the finite element method for modeling the power battery pack and analyzing its influence on the performance of the body-in-white. Based on a certain electric vehicle, the basic body-in-white model and the body-in-white model with the mass point addition and the refined model of the power battery pack were established, the static stiffness of the body-in-white simulation results of different models were compared and analyzed, and finally the effectiveness of the simulation model was verified through bench tests. Based on this effective model, the influence of the power battery pack on the modal and strength of the body-in-white was analyzed. The results show that the established refined model of the power battery pack has higher computational accuracy. Besides, the power battery pack can significantly increase the static stiffness of the electric vehicle body-in-white, effectively optimize the first-order torsion frequency and the first-order front cabin yaw frequency of the body-in-white, reduce the first-order bending frequency of the body-in-white, and greatly increase the risk of static strength failure of the body-in-white. In the setting of body performance goals and structural development, the influence of the power battery pack cannot be ignored.
与传统燃油车的设计相比,电动汽车的设计有其独特性,主要在于车身设计必须能够适应新的动力系统及其布局。动力电池组是影响电动汽车车身设计的重要因素。为了研究动力电池组的建模及其对车身性能的影响,建议使用有限元方法对动力电池组进行建模,并分析其对白色车身性能的影响力。以某电动汽车为例,建立了基本的白车身模型和添加质量点的白车身以及动力电池组的精细化模型,并对不同模型的白车身静态刚度仿真结果进行了比较分析,最后通过台架试验验证了仿真模型的有效性。基于该有效模型,分析了动力电池组对白色车身模态和强度的影响。结果表明,所建立的动力电池组精细模型具有较高的计算精度。此外,动力电池组可以显著提高白色电动车身的静态刚度,有效优化白色车身的一阶扭转频率和一阶前舱偏航频率,降低白色车身的第一阶弯曲频率,大大增加白色车身静态强度失效的风险。在车身性能目标的设定和结构开发中,动力电池组的影响不容忽视。
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引用次数: 0
Mechanism of time-delay feedback control of suspension damping with an annular vibration-absorbing structure 环形吸振结构悬架阻尼时滞反馈控制机理
IF 1 Q4 ENGINEERING, MECHANICAL Pub Date : 2023-08-22 DOI: 10.21595/jve.2023.23291
Yajie Chen, Kehui Ma, Chuanbo Ren, Yang Nan, Pengcheng Zhou
With the aim of enhancing both the ride comfort and the safety of the vehicle, we propose a new type of suspension with an annular vibration-absorbing structure, and establish a 3-DOF 1/4 vehicle model. The structure parameters and time-delay feedback control parameters are determined by particle swarm optimization algorithms, which take the root mean values of body acceleration, suspension dynamic deflection, and tire dynamic displacement as their optimization objectives. We analyze the stability of the suspension control system to ensure the stability of the time-delay control system through the Routh-Hurwitz stability criterion, characteristic root method, and stability switching method. Then, we compare and analyze the response characteristics of conventional suspension, new suspension without time-delay feedback control, and new suspension with time-delay feedback control under simple harmonic excitation and random excitation. The results show that the new suspension with time-delay feedback control has a significant damping effect on the body under the premise of ensuring the stability of the system.
为了提高车辆的乘坐舒适性和安全性,我们提出了一种新型的环形减振结构悬架,并建立了三自由度1/4车辆模型。采用粒子群优化算法确定结构参数和时滞反馈控制参数,以车身加速度、悬架动态挠度和轮胎动态位移的均方根值为优化目标。通过Routh-Hurwitz稳定性准则、特征根法和稳定性切换法,对悬架控制系统的稳定性进行了分析,以确保时滞控制系统的稳定。然后,我们比较分析了传统悬架、无时滞反馈控制的新型悬架和具有时滞反馈控制新悬架在简谐激励和随机激励下的响应特性。结果表明,在保证系统稳定性的前提下,采用时滞反馈控制的新型悬架对车身具有显著的阻尼作用。
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引用次数: 0
期刊
Journal of Vibroengineering
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