Shock and Vibration最新文献_第7页

Study on the Dynamic Properties of Concrete under Freeze-Thaw Cycles and CT Fine View Damage 混凝土在冻融循环和 CT 细观损伤下的动态特性研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-28 DOI: 10.1155/2023/6357286

Liangting Wang, Zhishan Zheng, Zheng Xiahou, Xijian Chao, Ming Xia

{"title":"Study on the Dynamic Properties of Concrete under Freeze-Thaw Cycles and CT Fine View Damage","authors":"Liangting Wang, Zhishan Zheng, Zheng Xiahou, Xijian Chao, Ming Xia","doi":"10.1155/2023/6357286","DOIUrl":"https://doi.org/10.1155/2023/6357286","url":null,"abstract":"In order to study the dynamic mechanical properties of concrete under freeze-thaw cycles, uniaxial impact compression tests were conducted on concrete specimens with different number of freeze-thaw cycles (0, 25, 50, 75, and 100) using a 50 mm diameter split Hopkinson pressure bar (SHPB) test device at an impact air pressure of 0.4 MPa and combined with a CT scanning system to analyze the internal fissures of concrete specimens before and after freeze-thaw cycles. The results showed the following. (1) The concrete specimens were divided into linear elastic stage, plastic stage, and damage stage under the freeze-thaw cycle, and the macroscopic mechanical parameters of the specimens were weakened with the increase of the number of freeze-thaw cycles. (2) Freeze-thaw intensified the expansion and penetration of the internal fracture of the specimens, and the CT scan results showed that the internal fracture parameters of the concrete specimens were increased with the increase of the number of freeze-thaw cycles, and the structural characteristics of the internal fracture show gradually complex expansion and evolution characteristics. (3) The degree of damage was defined at the fine level, which increased with the number of freeze-thaw cycles, establishing an intrinsic link between the fine deterioration of concrete specimens and the loss of macroscopic parameters under freeze-thaw cycles. The results are of great significance to further elucidate the internal structural characteristics of concrete material damage under freeze-thaw conditions and to reveal the damage deterioration mechanism.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"6 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and Optimization of a New Vibration Damping System for the Driving Characteristics of the Selected Case of Replacing Pneumatic Wheels with Nonpneumatic Wheels 针对用非气动车轮取代气动车轮的选定案例的行驶特性，设计和优化新型减振系统

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-22 DOI: 10.1155/2023/6050633

Renkai Ding, Ping Wang, Ruochen Wang, Dong Sun

引用次数: 0

Dynamic Response and Parameter Analysis of Electromagnetic Railguns under Time Varying Moving Loads 时变移动载荷下电磁轨道炮的动态响应和参数分析

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-19 DOI: 10.1155/2023/4351878

Lilan Liu, Xukai Zhang, Jiayi Wang

引用次数: 0

Detection, Localization, and Quantification of Damage in Structures via Artificial Neural Networks 通过人工神经网络检测、定位和量化结构损伤

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-19 DOI: 10.1155/2023/8829298

Daniele Kauctz Monteiro, Letícia Fleck Fadel Miguel, Gustavo Zeni, Tiago Becker, Giovanni Souza de Andrade, Rodrigo Rodrigues de Barros

{"title":"Detection, Localization, and Quantification of Damage in Structures via Artificial Neural Networks","authors":"Daniele Kauctz Monteiro, Letícia Fleck Fadel Miguel, Gustavo Zeni, Tiago Becker, Giovanni Souza de Andrade, Rodrigo Rodrigues de Barros","doi":"10.1155/2023/8829298","DOIUrl":"https://doi.org/10.1155/2023/8829298","url":null,"abstract":"This paper presents a structural health monitoring method based on artificial neural networks (ANNs) capable of detecting, locating, and quantifying damage in a single stage. The proposed framework employs a supervised neural network model that uses input factors calculated by modal parameters (natural frequencies or mode shapes), and output factors that represent the damage situation of elements or regions in a structural system. Unlike many papers in the literature that test damage detection methods only in numerical examples or simple experimental tests, this work also assesses the presented method in a real structure showing that it has potential for applications in real practical situations. Three different cases are evaluated through the methodology: numerical simulations, an experimental lab structure, and a real bridge. Initially, a cantilever beam and a 10-bar truss were numerically analyzed under ambient vibrations with different damage scenarios and noise levels. Afterward, the method is assessed in an experimental beam structure and in the Z24 bridge benchmark. The numerical simulations showed that the methodology is promising for identifying, locating, and quantifying single and multiple damages in a single stage, even with noise in the acceleration signals and changes in the first vibration mode of 0.015%. In addition, the Z24 bridge study confirmed that the damage detection method can localize damage in real civil structures considering only natural frequencies in the input factors, despite a mean difference of 4.08% between the frequencies in the healthy and damaged conditions.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"3 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138742588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bursting Oscillation Mechanisms of a Desktop Medical Shaker with Eccentric Turntables Affected by Dry Friction 受干摩擦影响的带有偏心转盘的台式医用振动器的爆破振动机制

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-13 DOI: 10.1155/2023/8374444

Rui Qu, Xin Xia

引用次数: 0

Topographic Effects on the Seismic Response of Trapezoidal Canyons Subjected to Obliquely Incident SV Waves 地形对受斜入射 SV 波影响的梯形峡谷地震响应的影响

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-12 DOI: 10.1155/2023/3384829

Hui Shen, Yaqun Liu, Haibo Li, Bo Liu

引用次数: 0

Development of an Impact Energy Absorption Structure by an Arc Shape Stroke Origami Type Hydraulic Damper 利用弧形冲程折纸式液压阻尼器开发冲击能量吸收结构

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-09 DOI: 10.1155/2023/4578613

Jingchao Guan, Yuan Yao, Wei Zhao, Ichiro Hagiwara, Xilu Zhao

{"title":"Development of an Impact Energy Absorption Structure by an Arc Shape Stroke Origami Type Hydraulic Damper","authors":"Jingchao Guan, Yuan Yao, Wei Zhao, Ichiro Hagiwara, Xilu Zhao","doi":"10.1155/2023/4578613","DOIUrl":"https://doi.org/10.1155/2023/4578613","url":null,"abstract":"Cylindrical hydraulic dampers used to reduce impacts and vibrations typically have linear strokes. In this study, a new arc-shaped stroke-type origami hydraulic damper with a nonlinear damping performance was proposed. By examining the damping effect of the origami hydraulic damper, the damping force was found to be proportional to the square of the motion velocity. A nonlinear dynamics governing equation was established using the derived formula for the damping force of the origami hydraulic damper, and a numerical analysis using the Runge–Kutta method was established. An impact test device with an arc-shaped stroke was developed, and the error between the numerical analysis value of the impact displacement and the measured experimental value was confirmed to be sufficiently small. An impact verification experiment confirmed that the damping effect of the origami hydraulic damper increases with the input energy of the impact. By varying the diameter of the orifice hole, which is an important design factor for an origami hydraulic damper, the damping effect of the origami hydraulic damper was found to increase as the diameter of the orifice hole decreased. To examine the effect of the type of hydraulic oil inside the origami hydraulic damper, water and edible oil were used to conduct impact verification experiments, and it was found that the effect on the impact damping effect was relatively small.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"115 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138560342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the Numerical Relationship between Dynamic Compressive Strength and Crushing Energy Consumption in Dynamic Point Load Test under Different Corrosion Conditions 不同腐蚀条件下动态点荷载试验中动态抗压强度与破碎能耗的数值关系研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-07 DOI: 10.1155/2023/3925252

Ming Zhou, Lan Qiao, An Luo, Qingwen Li

{"title":"Study on the Numerical Relationship between Dynamic Compressive Strength and Crushing Energy Consumption in Dynamic Point Load Test under Different Corrosion Conditions","authors":"Ming Zhou, Lan Qiao, An Luo, Qingwen Li","doi":"10.1155/2023/3925252","DOIUrl":"https://doi.org/10.1155/2023/3925252","url":null,"abstract":"Compared with most dynamic tests, point load test is widely used in engineering practice because of its wide requirements for test conditions. In offshore mining engineering, the surrounding rock is affected by dynamic load impact and corrosion of various aqueous solutions for a long time. Therefore, it is of great significance to study the influence of hydrochemical corrosion on dynamic mechanical properties of rock to ensure the stability of surrounding rock. In this paper, a large number of dynamic point load and dynamic uniaxial compression tests were carried out on the granite mined from a large mine by using the Split Hopkinson pressure bar test device after the corrosion of pH values of 2, 5, and 7 solutions, respectively. Based on the energy theory, the crushing energy consumption in the test process is analyzed, and finally the fitting formula of the dynamic compressive strength and the crushing energy consumption in the dynamic point load test is obtained through fitting analysis. The results show that when the crushing energy consumption in the dynamic point load test is used to estimate the dynamic compressive strength, a certain crushing energy consumption (the final value of this test is 70 J in this paper) is more accurate, and it can estimate the dynamic compressive strength under various corrosion conditions under this crushing energy consumption. However, with the change of crushing energy consumption in the dynamic point load test, this transformation relationship is no longer accurate, and it is necessary to modify this transformation relationship with corrosion condition as the influencing factor. This conclusion can provide reference for obtaining the dynamic compressive strength of rocks under different corrosion conditions in engineering field in the future.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"27 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138547306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on Material Selection Method and Brittle Fracture Mechanism of High-Pressure Pipeline 高压管道材料选择方法及脆性断裂机理研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-05 DOI: 10.1155/2023/9541736

Yulin Li, Zhihui Li

{"title":"Research on Material Selection Method and Brittle Fracture Mechanism of High-Pressure Pipeline","authors":"Yulin Li, Zhihui Li","doi":"10.1155/2023/9541736","DOIUrl":"https://doi.org/10.1155/2023/9541736","url":null,"abstract":"Aiming at the problem of the brittle fracture of pressure pipeline, the elastic constraint structure is described by using members and engineering building structures, and the concept of elastic constraint is proposed. Through the stress field analysis of the pressure pipeline under internal pressure, it is found that the pressure pipeline under internal pressure is an elastic constraint structure. The elastic constraint effect is applied to the pressure pipeline to explore the influence of elastic constraint effect on the brittle fracture of pressure pipeline. The critical wall thickness and limit load of different materials are calculated by the limit bearing formula. Through simulation analysis of materials with different yield ratios and pipelines with different wall thicknesses of the same material (yield ratio is the ratio of yield strength to tensile strength), it was found that pressure pipelines made of the same material have an increased load-bearing capacity as the wall thickness increases, but their own elastic constraint effects are becoming more obvious, and the probability of the brittle fracture of the pipeline is higher. When the wall thickness of pressure pipelines made of materials with different yield ratios is certain, the lower the yield ratio is, the more likely the pipeline is to generate plastic deformation and the larger the deformation capacity is; the higher the yield ratio, the poorer the plastic deformation capacity of the pipeline and the smaller the deformation capacity. Pipelines with large yield ratio are more sensitive to the brittle fracture than those with small yield ratio.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"36 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the Influence Factors on Harvesting Capacity of a Piezoelectric Vibration Energy Harvesting System Covered on Curved Beam with Acoustic Black Hole 声波黑洞弯曲梁覆盖压电振动能量收集系统收集能力的影响因素研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2023-12-04 DOI: 10.1155/2023/6604388

Miaoxia Xie, Fengwei Gao, Peng Zhang, Yuanqi Wei, Meijuan Tong, Yumin He, Guanhai Yan

{"title":"Study on the Influence Factors on Harvesting Capacity of a Piezoelectric Vibration Energy Harvesting System Covered on Curved Beam with Acoustic Black Hole","authors":"Miaoxia Xie, Fengwei Gao, Peng Zhang, Yuanqi Wei, Meijuan Tong, Yumin He, Guanhai Yan","doi":"10.1155/2023/6604388","DOIUrl":"https://doi.org/10.1155/2023/6604388","url":null,"abstract":"The acoustic black hole (ABH) structures have been shown to have great potential for energy harvesting. Within an ABH, the bending wave velocity decreases rapidly and the phase accumulates, resulting in localised energy accumulation. It is very significant that the energy can be harvested and power can be supplied for microelectronic devices. How to improve energy harvesting capacity is a problem that needs to be solved. Previous research on energy harvesting capacity of straight beams and flat plates with ABH has yielded a wealth of results. However, in practical engineering, curved beams are also commonly found. Given the differences in structure, it is of practical significance to study the influence factors on harvesting capacity of the piezoelectric vibration energy harvesting system covered on curved beam with acoustic black hole. First, the vibration characteristics of curved beam with ABH are analysed by the finite element method and localised energy accumulation is observed. Then, energy harvesting capacity is studied by means of the electromechanical coupling model in FEA; it has been found that energy harvesting capacity is lower in high frequency. The reason of this problem is analysed and solved by dividing the size of the piezoelectric sheet in an array layout. Based on this, the influence of array layout of piezoelectric cells on the energy harvesting capacity of the system is focused on. In addition, the influence of resistance value, material property, and curvature of curved beam on the energy harvesting capacity is analysed. Some meaningful results are obtained. These results provide the guidance to the design and optimisation for an energy harvesting system covered on curved beam with ABH.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"7 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0