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

An Investigation of the Acoustic Enclosure of an Air Conditioning Compressor Using Response Surface Analysis and Topological Rigidity Optimization 利用响应面分析和拓扑刚度优化对空调压缩机隔音罩的研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-05-09 DOI: 10.1155/2024/1909530

Hai-Feng Cao, Cang-Jie Yang, Ren-Lian Ma, Shi-Wei Ni, Zheng-Kai Song, Xi Wang, Yu-Xuan Chen, Chen-Xing Jiang

{"title":"An Investigation of the Acoustic Enclosure of an Air Conditioning Compressor Using Response Surface Analysis and Topological Rigidity Optimization","authors":"Hai-Feng Cao, Cang-Jie Yang, Ren-Lian Ma, Shi-Wei Ni, Zheng-Kai Song, Xi Wang, Yu-Xuan Chen, Chen-Xing Jiang","doi":"10.1155/2024/1909530","DOIUrl":"https://doi.org/10.1155/2024/1909530","url":null,"abstract":"A novel split-type air conditioning system is introduced to balance usability and portability. Unlike conventional split-type systems, where the compressor is typically placed outside, this system situates the compressor within the indoor unit, which may expose users to compressor noise. There are prominent peaks in the compressor noise spectrum, particularly at the compressor operating frequency and its harmonics, notably the second and third harmonics. The research presents a multilayered acoustic enclosure specifically designed for air conditioning compressors to address this issue without modifying the compressor or indoor unit casing. In order to get better sound insulation performance, a response surface methodology (RSM) is applied to optimize the thickness ratio, open area ratio, and open area height of the acoustic enclosure with predefined thickness. In addition, topological optimization is employed to strengthen weak areas of the acoustic enclosure. Then, experimental trials using the proposed acoustic enclosure are conducted in a semianechoic chamber. Results demonstrate significant reductions in noise levels, including 7.99 dB(A), 5.69 dB(A), and 5.19 dB(A) reductions in the fundamental frequency, second harmonic, and third harmonic noise of the compressor’s operating frequency, respectively.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"304 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939736","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

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

The Modeling Method for Vibration Characteristics Analysis of Composite-Laminated Rotationally Stiffened Plate 复合材料层压旋转刚化板振动特性分析建模方法

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-16 DOI: 10.1155/2024/6686343

Hong Zhang, Yiqun Ding, Lin He, Changgeng Shuai, Chao Jiang

{"title":"The Modeling Method for Vibration Characteristics Analysis of Composite-Laminated Rotationally Stiffened Plate","authors":"Hong Zhang, Yiqun Ding, Lin He, Changgeng Shuai, Chao Jiang","doi":"10.1155/2024/6686343","DOIUrl":"https://doi.org/10.1155/2024/6686343","url":null,"abstract":"The composite-laminated rotationally stiffened plate is widely applied in aviation, aerospace, ship, machinery, and other fields. For structural design and optimization, to investigate the vibration characteristics is important. In this paper, a modeling method of composite-laminated rotationally plate is established. The first-order shear deformation theory (FSDT) and the modified Fourier series are applied to construct the admissible displacement function of the stiffened plate-coupled systems. On this basis, the energy function of composite-laminated rotationally stiffened plate is established. Combined with the artificial virtual spring technology, the proposed theory could be used to analyze the vibration characteristics of composite-stiffened plate-coupled systems with various classical boundary conditions or arbitrary elastic boundary conditions. The Rayleigh–Ritz method is used to solve the energy function. Thus, the vibration characteristics of the composite-laminated rotationally stiffened plate are obtained and analyzed. The correctness of the theoretical analysis model was verified through modal experiments. On this basis, the effect of some important parameters on the vibration characteristics of stiffened plate structures is studied, such as the number, thickness, and width of the laminated stiffener, varying structural parameters, and different boundary conditions. This study can provide the theoretical basis for the vibration and noise reduction of such structures.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"6 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580377","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

Research on the Application of Variational Mode Decomposition Optimized by Snake Optimization Algorithm in Rolling Bearing Fault Diagnosis 蛇形优化算法优化的变分模式分解在滚动轴承故障诊断中的应用研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-05 DOI: 10.1155/2024/5549976

Houxin Ji, Ke Huang, Chaoquan Mo

{"title":"Research on the Application of Variational Mode Decomposition Optimized by Snake Optimization Algorithm in Rolling Bearing Fault Diagnosis","authors":"Houxin Ji, Ke Huang, Chaoquan Mo","doi":"10.1155/2024/5549976","DOIUrl":"https://doi.org/10.1155/2024/5549976","url":null,"abstract":"The rolling bearing is one of the commonly used mechanical components in rotating machinery, and its health directly affects the normal operation of equipment. However, the fault signal of rolling bearing is susceptible to noise interference, which makes it difficult to extract the fault characteristics of the rolling bearing and thus affects the accuracy of the diagnosis results. To address this problem, this paper proposes a method by using a snake optimization algorithm to optimize variational mode decomposition (SOA-VMD) and applies it to the extraction of the fault feature of rolling bearing. First, the minimum Shannon entropy to kurtosis ratio (EKR) is used as the fitness function of SOA to search for the best parameter combination of VMD. Second, the optimized VMD is used to decompose the vibration signal of rolling bearing to obtain K intrinsic mode functions (IMFs). Then, the IMF with the most fault information is selected for reconstruction through EKR. The Teager–Kaiser energy operator (TKEO) spectrum analysis is performed on the reconstructed signal. Finally, this method is used to analyze the simulation signal and rolling bearing vibration signal and compared with empirical mode decomposition (EMD), ensemble empirical mode decomposition (EEMD), and complete ensemble empirical mode decomposition adaptive noise (CEEMDAN) algorithms to verify the feasibility and effectiveness of the SOA-VMD method.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"37 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580362","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 Sound Absorption Properties of Polyvinyl Chloride (PVC) Film Multicavity Structure Materials 聚氯乙烯 (PVC) 薄膜多腔结构材料的吸音特性研究

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-04-02 DOI: 10.1155/2024/3820651

Tingying Zhang, Jiyang Zhang, Pengxuan Zheng, Hong Hou, Ying Xu

{"title":"Study on Sound Absorption Properties of Polyvinyl Chloride (PVC) Film Multicavity Structure Materials","authors":"Tingying Zhang, Jiyang Zhang, Pengxuan Zheng, Hong Hou, Ying Xu","doi":"10.1155/2024/3820651","DOIUrl":"https://doi.org/10.1155/2024/3820651","url":null,"abstract":"Since the development of industry, sound absorption and noise reduction have gradually become an urgent problem to be solved. Lightweight polymer film materials are very effective in response to sound waves, and sound waves can easily cause vibration of the film, which can convert sound energy into vibration and film friction to achieve sound absorption. The application conditions of the film material are very harsh, that is, a support body is required to fix the film and the film needs to be tensioned. The film is very thin and easy to damage. The idea of this research is to transform the film into a bubble structure and use a large number of film bubbles to form a cavity structure material. As a unit of the sound absorption structure, bubbles can avoid damage to the film. In this paper, commercial polyvinyl chloride film bubble materials are used to prepare two kinds of film multicavity structure materials, and the sound absorption performance of this film multicavity structure material is studied. The research results show that this film multicavity structure material has very excellent broadband sound absorption performance, which changes the narrow band sound absorption properties of the usual film single cavity. The average sound absorption coefficient can reach 0.84 in frequency range from 500 Hz to 6400 Hz. This structural material has a single peak sound absorption curve at the middle and low frequency bands, which is the characteristic of resonance sound absorption. And at the middle and high frequency bands, it exhibits the characteristics of broadband sound absorption. The film multicavity structure material has both cavity sound absorption and broadband sound absorption characteristics.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"15 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580589","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

TVMS Calculation and Dynamic Analysis of Cracked Gear considering Oil Film Stiffness 考虑油膜刚度的裂纹齿轮 TVMS 计算和动态分析

IF 1.6 4区工程技术

Shock and Vibration Pub Date : 2024-03-27 DOI: 10.1155/2024/5571578

Jiateng Wu, Zhenqi Du, Chengbiao Tong

{"title":"TVMS Calculation and Dynamic Analysis of Cracked Gear considering Oil Film Stiffness","authors":"Jiateng Wu, Zhenqi Du, Chengbiao Tong","doi":"10.1155/2024/5571578","DOIUrl":"https://doi.org/10.1155/2024/5571578","url":null,"abstract":"A time-varying meshing stiffness (TVMS) model that includes oil film stiffness in the elastohydrodynamic lubrication (EHL) line contact is proposed for tooth root cracking. This model employs the oil film thickness to estimate the stiffness of the oil film in gear contact by considering the profile variation of the oil film induced by tooth root cracks, to provide the evolution principle of TVMS in EHL line contact to study the effects of oil film stiffness of cracked gear on the TVMS. The results of the analysis reveal that the overall result of TVMS decreases owing to the stiffness of the oil film, whereas the combined TVMS depends mainly on the rotation speed of the gear system because the thickness of the oil film in the tooth crack is affected by the velocity of the entrainment. Furthermore, a six-degree-of-freedom (DOF) dynamic model is introduced to analyze the vibration behavior of the gear system using the combined TVMS results for different crack levels, and the influence of the combined TVMS on the vibration response of the tooth root crack is exhibited from the time-domain analysis, frequency-domain analysis, and statistical indicator analysis.","PeriodicalId":21915,"journal":{"name":"Shock and Vibration","volume":"2020 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311698","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