Shock and Vibration最新文献

Control Effect Analysis and Engineering Application of Anchor Cable Beam-Truss Structure on Large-Deformation Roadway in Deep Coal Mine 深部煤矿大变形巷道锚索梁桁结构控制效应分析及工程应用

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-05-24 DOI: 10.1155/2024/2987574

En Wang, Shuaifeng Yin, Qifeng Zhao, Qingtao Kang, Xinjian Zheng

{"title":"Control Effect Analysis and Engineering Application of Anchor Cable Beam-Truss Structure on Large-Deformation Roadway in Deep Coal Mine","authors":"En Wang, Shuaifeng Yin, Qifeng Zhao, Qingtao Kang, Xinjian Zheng","doi":"10.1155/2024/2987574","DOIUrl":"https://doi.org/10.1155/2024/2987574","url":null,"abstract":"In response to the shortcomings of the small support scope of single anchor cable and failure to fully utilize the joint anchoring for surrounding rock, this study summarizes the classification of basic support forms for coal mine roadway surrounding rock and clarifies the main composition and mechanism of anchor cable beam-truss structure. A mechanical model of roadway roof beam under the conditions of no support, single anchor cable support, and anchor cable beam-truss structure support at both ends of the roadway is constructed, and the force and maximum bending moment of roadway roof beam under different support types are compared and analyzed. The study clarifies the bending moment reduction rate of anchor cable beam-truss structure relative to unsupported and single anchor cable support and combines numerical simulation to analyze the response laws of anchor cable beam-truss to prestress distribution and stress shell in roadway surrounding rock. Based on the on-site engineering application of a typical large-deformation mining roadway in a deep coal mine, the important role of anchor cable beam-truss structure in ensuring the safety and stability of surrounding rock in deep high-stress and intense-mining large-deformation roadway is revealed, providing technical references for surrounding rock control of similar conditions in deep roadways.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"51 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146627","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 Pretightening Loss Effect of Bolt Support in Deep Soft Rock Roadway 深厚软岩巷道中螺栓支撑的预紧损失效应研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-05-14 DOI: 10.1155/2024/3834064

Fenghai Yu, Bo Sun, Qingduo Wang, Ping Fang, Tao Zhang, Jianchong Chen, Xin Zhao, Dehe Zhu

{"title":"Study on Pretightening Loss Effect of Bolt Support in Deep Soft Rock Roadway","authors":"Fenghai Yu, Bo Sun, Qingduo Wang, Ping Fang, Tao Zhang, Jianchong Chen, Xin Zhao, Dehe Zhu","doi":"10.1155/2024/3834064","DOIUrl":"https://doi.org/10.1155/2024/3834064","url":null,"abstract":"The magnitude of pretension force serves as an important indicator of the effectiveness of anchor bolt active support and is one of the significant factors influencing the stability of tunnel surrounding rock. Therefore, in practical engineering, it is crucial to establish the relationship between pretension torque and pretension force. However, current research in this field has some limitations. With a specific mine in western China as the engineering background, this paper first analyzed the influence factors of surrounding rock deformation and failure, established a mechanical model for pretension structure of anchor bolt support, and derived the quantitative relationship between pretension torque and pretension force based on hypothetical conditions. Finally, it proposed the loss effect of anchor bolt support and modified the pretightening loss coefficient for engineering application. The research results show that the actual pretightening force of anchor support is lower due to the influence of deep soft coal seam, which leads to failure of coal pillar under mining stress. The loss effect of surrounding rock on pretightening force was represented by a coefficient <i>k</i>, and the modified value of the coefficient was calculated as 0.19∼0.43. By applying the modified relationship between pretightening torque and pretightening force, it was found that the actual pretightening torque of 300 Nm applied to 11307 return air roadway effectively controlled surrounding rock deformation and failure, with coal pillar displacement less than 120 mm.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"2016 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939635","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

Examination of Precast Concrete Movement Subjected to Vibration Employing Mass-Spring Model with Two Convective Masses 利用带有两个对流质量的质量-弹簧模型检验预制混凝土在振动下的运动情况

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-05-13 DOI: 10.1155/2024/6341133

Gultekin Aktas

引用次数: 0

Nonlinear Displacement of the Electrothermal V-Shaped Actuator 电热 V 型致动器的非线性位移

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-05-02 DOI: 10.1155/2024/7121490

Truong Duc Phuc, Phuc Hong Pham, Kien Trung Hoang, Bui Ngoc-Tam

引用次数: 0

Researching the Influence of Preload on Vibration Characteristics in the Ballistic Recorder Vibration Damping System 研究预载对弹道记录仪减震系统振动特性的影响

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-30 DOI: 10.1155/2024/5868224

Wencan Jiang, Yonggang Lu, Jianyu Zhao

{"title":"Researching the Influence of Preload on Vibration Characteristics in the Ballistic Recorder Vibration Damping System","authors":"Wencan Jiang, Yonggang Lu, Jianyu Zhao","doi":"10.1155/2024/5868224","DOIUrl":"https://doi.org/10.1155/2024/5868224","url":null,"abstract":"In this study, the vibration characteristics of a bullet-loaded recorder’s vibration damping system under various preload conditions are investigated through theoretical analysis, numerical simulations, and experimental verification. The findings indicate that the inclusion of a polyurethane elastomer vibration damping buffer layer between the cartridge and the recorder, along with the application of a specific preload, significantly reduces the amplitude of vibration acceleration transmitted to the recorder’s interior. This, in turn, enhances the overload resistance of the cartridge’s internal circuit. Numerical simulation results and theoretical analysis suggest that increasing the preload on the buffer material between the elastomer and the recorder reduces both the frequency ratio and damping ratio of the damping system. This reduction further decreases the amplitude of vibration transmitted to the recorder. However, excessively high preload generates substantial compressive stress within the recorder under static conditions, intensifying during the projectile’s accelerated movement. As a consequence, deformation and damage occur to the internal circuitry. Therefore, ensuring that the recorder possesses the structural strength necessary to withstand increased preload is crucial. This balancing act improves the recorder’s resistance to shock, vibration, and overload, while also preventing excessive stress-induced damage.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"159 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140830746","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

Deep Multiscale Soft-Threshold Support Vector Data Description for Enhanced Heavy-Duty Gas Turbine Generator Sets’ Anomaly Detection 用于增强型重型燃气涡轮发电机组异常检测的深度多尺度软阈值支持向量数据描述

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-29 DOI: 10.1155/2024/3374107

Zhang Kun, Li Hongren, Wang Xin, Xie Daxing, Sun Xiaokai

{"title":"Deep Multiscale Soft-Threshold Support Vector Data Description for Enhanced Heavy-Duty Gas Turbine Generator Sets’ Anomaly Detection","authors":"Zhang Kun, Li Hongren, Wang Xin, Xie Daxing, Sun Xiaokai","doi":"10.1155/2024/3374107","DOIUrl":"https://doi.org/10.1155/2024/3374107","url":null,"abstract":"This paper introduces an innovative approach, Deep Multiscale Soft-Threshold Support Vector Data Description (DMS-SVDD), designed for the detection of anomalies and prediction of faults in heavy-duty gas turbine generator sets (GENSETs). The model combines a support vector data description (SVDD) with a deep autoencoder backbone network framework, integrating a multiscale convolutional neural network (M) and soft-threshold activation network (S) into the Deep-SVDD framework. In comparison with conventional methods, such as One-Class Support Vector Machine (OCSVM) and autoencoder (AE), DMS-SVDD demonstrates improvements in accuracy (by 22.94%), recall (by 32%), F1 score (by 12.02%), and smoothness (by 39.15%). The model excels particularly in feature extraction, denoising, and early fault detection, offering a proactive strategy for maintenance. Furthermore, the DMS-SVDD demonstrated enhanced training efficiency with a reduction in the convergence rounds by 66% and overall training times by 34.13%. The study concludes that DMS-SVDD presents a robust and efficient solution for gas turbine anomaly detection, with practical advantages for decision support in turbine maintenance. Future research could explore additional refinements and applications of the DMS-SVDD model across diverse industrial contexts.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"125 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140810158","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

Calculation of Temperature Action of Flat Steel Box Girder of Long-Span Bridges Using a Joint Model of ARMA Mean and GARCH Variance 利用 ARMA 均值和 GARCH 方差联合模型计算大跨度桥梁扁钢箱梁的温度作用力

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-26 DOI: 10.1155/2024/1948140

Jun Yang, Dacheng Zhao, Bin Chen, Gaoxin Wang

引用次数: 0

Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves 位于小半径反向曲线上的铁路桥梁的高效动态性能预测

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-09 DOI: 10.1155/2024/6666054

Yumin Song, Bin Hu, Xiaoliang Meng

{"title":"Efficient Dynamic Performance Prediction of Railway Bridges Situated on Small-Radius Reverse Curves","authors":"Yumin Song, Bin Hu, Xiaoliang Meng","doi":"10.1155/2024/6666054","DOIUrl":"https://doi.org/10.1155/2024/6666054","url":null,"abstract":"Bridges situated on small-radius reverse curves play a pivotal role within some railway networks, exerting influence over project-wide design progress. Typically, assessing the safety of bridge design parameters necessitates laborious vehicle-bridge dynamic coupling vibration numerical analysis or model experiments. To streamline the design process and enhance efficiency during the preliminary design phase, we propose an efficient method to assess the dynamic performance of bridges on small-radius reverse curves. This approach enables direct prediction of bridge dynamic performance based on design parameters, eliminating the need for numerical simulations and model experiments. We first develop a vehicle-bridge coupling vibration program grounded in train-curve bridge coupling vibration theory, validated using on-site measured data. Subsequently, through numerical simulation experiments, we evaluate 80 simply supported beam bridges on small-radius reverse curves under various operating conditions, generating ample dynamic response data for bridge pier tops and girders. These data are then compared with regulatory thresholds to assign dynamic performance labels. After identifying essential design parameters as data features using Fisher scores, we proceed to input these features into a support vector machine (SVM). Through supervised training with dynamic performance labels, this process empowers the SVM model to predict the dynamic performance of the bridge. Our results demonstrate that this method circumvents the need for detailed vehicle-bridge interaction analysis, yielding an impressive 86.9% accuracy in predicting dynamic performance and significantly boosting computational efficiency. Besides, the top five design parameters that significantly influence the prediction of bridge dynamic performance are obtained. This novel approach has the potential to expedite design assessments and enhance safety in railway bridge construction.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"53 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580585","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

Simulation of Transient Temperature and Clearance after Shutdown of Aeroengine Based on CFD and FEA Coupled Models 基于 CFD 和 FEA 耦合模型的航空发动机关机后瞬态温度和间隙模拟

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-08 DOI: 10.1155/2024/3388056

Xuanming Ge, Yan Gao, Wei Gu, Dongyu Sui, Lingling Yue

{"title":"Simulation of Transient Temperature and Clearance after Shutdown of Aeroengine Based on CFD and FEA Coupled Models","authors":"Xuanming Ge, Yan Gao, Wei Gu, Dongyu Sui, Lingling Yue","doi":"10.1155/2024/3388056","DOIUrl":"https://doi.org/10.1155/2024/3388056","url":null,"abstract":"It is crucial to comprehend the heat soak phenomenon, which may result in a significant temperature increase after the shutdown followed by a gradual decrease. This could bring potential risks for the engine including oil coking. The temperature change of engine components dictates the clearance after shutdown, while startup strategies are primarily based on this. A simulation strategy, utilizing computational fluid dynamics (CFD) and finite element analysis (FEA) coupled models, is suggested to investigate the transient temperature and clearance after shutdown. The maximum temperature deviation between the simulation result and experimental data are less than 6%. Flow parameters, including velocity and mass flow rate obtained from the CFD result, were applied as boundaries of the FEA model. Based on the FEA model, transient temperature calculations were also conducted for 20 hours after shutdown. The results indicate that the FEA model demonstrates good agreement with the CFD simulation, with a maximum deviation of less than 5% and at only 0.2% of the simulation time. After the engine shuts down, the stator’s temperature change rate is faster than that of the rotor due to better cooling conditions and relatively small heat capacity. Consequently, the seal clearance increases in the initial period after shutdown and then decreases to a minimum value. The nondimensional minimum clearance can be 0.8 times the cold state value at the location of the high-pressure turbine seal.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"19 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580475","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

Prediction of Vibration Waveform and Division of Influenced Partitions under the Action of Blasting 爆破作用下的振动波形预测和受影响分区划分

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-01 DOI: 10.1155/2024/9666468

Yan Zhao, Xiangxiang Yin, Hailong Wang, Lijie Ge, Jialei Yan, Yunhe Li, Huilin Li, Jinglei Liu

引用次数: 0