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Multiple periodic motions of a two degrees-of-freedom carbon fiber reinforced polymer laminated cylindrical shell 二自由度碳纤维增强聚合物层合圆柱壳的多周期运动
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23288
Ting Gao, Jing Li, Shaotao Zhu, Ziyu Guo
{"title":"Multiple periodic motions of a two degrees-of-freedom carbon fiber reinforced polymer laminated cylindrical shell","authors":"Ting Gao, Jing Li, Shaotao Zhu, Ziyu Guo","doi":"10.21595/vp.2023.23288","DOIUrl":"https://doi.org/10.21595/vp.2023.23288","url":null,"abstract":"Carbon fiber reinforced polymer is a composite material, which is widely used in various engineering fields due to its excellent properties. We systematically discuss the influence of axial load amplitude parameters on the multiple periodic motions of carbon fiber reinforced polymer laminated cylindrical shell model. Based on the Melnikov vector function, the bifurcation regions of periodic orbits are obtained. It is found that the system has at most four periodic orbits under parameters conditions. Moreover, the phase portraits of periodic orbits are given by numerical simulation. The results offer an idea for parameter control of shell structure.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128721","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
Study of age changes of basic anthropometric characteristics of Bulgarian females: groups 18-25 versus 30-40 years old 保加利亚女性基本人体测量特征的年龄变化研究:18-25组与30-40组
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23463
Gergana Nikolova, Daniel Dantchev
{"title":"Study of age changes of basic anthropometric characteristics of Bulgarian females: groups 18-25 versus 30-40 years old","authors":"Gergana Nikolova, Daniel Dantchev","doi":"10.21595/vp.2023.23463","DOIUrl":"https://doi.org/10.21595/vp.2023.23463","url":null,"abstract":"The present article aims to examine the age-related changes in the basic characteristics important for biomechanics (body height and body weight) of Bulgarian men. We do this after dividing the measured individuals into two age groups: I) 18-25 years and II) 30-40 years. The data used in the investigation were collected by performing our own anthropometric measurements. In group I) we measured 41 men and in group II) – 44 men. We present the mean values, standard deviations, and minimal and maximal values of the height, weight, and body mass index of each of the groups, as well as the corresponding probability distributions of these characteristics. The obtained results can be used when there is a need for such anthropometric and mass parameters, e.g., in problems related to the biomechanics of human movements, ergonomics, rehabilitation, orthopaedics and traumatology, sports, forensic studies, etc.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128725","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
Development of an empirical model for the prediction of the airflow resistivity of thin and low-density fibrous materials 建立了一种预测薄、低密度纤维材料气流电阻率的经验模型
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23382
Regan Dunne, Dawood Desai, Philippus Heyns
{"title":"Development of an empirical model for the prediction of the airflow resistivity of thin and low-density fibrous materials","authors":"Regan Dunne, Dawood Desai, Philippus Heyns","doi":"10.21595/vp.2023.23382","DOIUrl":"https://doi.org/10.21595/vp.2023.23382","url":null,"abstract":"This study develops an empirical model to predict the airflow resistivity of thin and low-density sound-absorbing materials. Airflow resistivity is a key input parameter for Finite Element Method (FEM) simulations of sound pressure levels (SPLs) in vehicle cabins. However, existing models for determining the airflow resistivity of thin and low-density fibrous materials are inaccurate. Therefore, this study proposes a simple and reliable model based on multiple linear regression analysis of polypropylene fibrous nonwoven samples. The samples were tested using equipment designed according to ISO standards 9053-1. The model selection was performed using stepwise techniques to identify the most relevant predictors. The final model, along with its coefficients and goodness of fit statistics, is presented and discussed. The results of this study offer a practical tool for design engineers to estimate the airflow resistivity of thin and low-density materials, which can improve the accuracy of FEM simulations of SPLs in vehicle cabins.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128732","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
The structural design and simulation of the tubing handling manipulator 油管搬运机械手的结构设计与仿真
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23523
Li Xuan, Zhu Jin, Huang Qi, Zhou Xiaojun
{"title":"The structural design and simulation of the tubing handling manipulator","authors":"Li Xuan, Zhu Jin, Huang Qi, Zhou Xiaojun","doi":"10.21595/vp.2023.23523","DOIUrl":"https://doi.org/10.21595/vp.2023.23523","url":null,"abstract":"The size of the oil pipes in the factory is relatively large, making them inconvenient to handle. There are few existing oil pipe handling devices, and a 2P2R four degree of freedom manipulator device has been innovatively designed to complete the oil pipe handling work. First, the three-dimensional model of the manipulator was established using SolidWorks software, and then the improved D-H method was used to carry out the kinematics modeling of the manipulator system, and the forward and Inverse kinematics equations were derived. Then, the MATLAB software was used to carry out the kinematics analysis of the manipulator, and the manipulator workspace was calculated. The movement trajectory, as well as the displacement, speed, and acceleration curves under the trajectory were obtained using the fifth order Polynomial interpolation method, Finally, the 3D model was imported into Adams software, and an Adams virtual prototype was established for dynamic analysis. The force and torque curves of each joint were obtained, laying the foundation for further design and research in the future.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128986","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 identification of a stone masonry building: influence of damage and of CRM retrofitting 石质砌体建筑的动力识别:损伤影响及CRM改造
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23581
Ingrid Boem, Michele Dilena, Natalino Gattesco
{"title":"Dynamic identification of a stone masonry building: influence of damage and of CRM retrofitting","authors":"Ingrid Boem, Michele Dilena, Natalino Gattesco","doi":"10.21595/vp.2023.23581","DOIUrl":"https://doi.org/10.21595/vp.2023.23581","url":null,"abstract":"The dynamic identification of a full-scale, two-storey building, made of rubble stone masonry, was achieved. Different configurations were analyzed: unstrengthened masonry and retrofitted masonry, in both undamaged and damaged conditions. Damage was accomplished by testing the building under lateral cyclic loading, to reproduce the seismic effects. The strengthening technique (CRM – Composite Reinforced Mortar) consisted in plastering the outer facades by means of a 30 mm tick mortar coating reinforced with glass-fiber polymer meshes and in introducing transversal connectors injected in the masonry. The mode shapes and natural vibrating frequencies were analyzed and compared, evidencing the effects of damage and of retrofitting. A finite element numerical model was developed, to perform eigenvalue analysis and calibrate the equivalent masonry stiffness for the different configurations.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128999","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
Oil-separation properties of aviation grease under thermal aging 热老化下航空润滑脂的油分离性能
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23542
Chaoyi Wang, Chuanhai Chen, Zhifeng Liu, Changxin Liu, Jinyan Guo, Peijuan Cui
{"title":"Oil-separation properties of aviation grease under thermal aging","authors":"Chaoyi Wang, Chuanhai Chen, Zhifeng Liu, Changxin Liu, Jinyan Guo, Peijuan Cui","doi":"10.21595/vp.2023.23542","DOIUrl":"https://doi.org/10.21595/vp.2023.23542","url":null,"abstract":"During work or long-term storage, grease is susceptible to thermal oxygen or mechanical aging, which affects the performance of grease or even leads to the destruction of the structural surface of grease lubricated products. As the main mechanism of grease lubrication, grease partitioning can explore the aging law of grease and effectively identify whether the grease fails. In this paper, 7014 aerospace grease was selected as the research object and accelerated test was conducted by high temperature thermal oxygen. The combination of grease separation degree and mass change rate was selected for comprehensive characterization of grease separation performance. The results show that the grease partitioning degree has a significant decreasing trend; the quality change has also decreased and the degradation trajectory is similar to the partitioning degree; it is inferred that the main reason for the decrease of grease partitioning performance may be the loss of base oil and the change of thickener fiber structure.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136129003","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
Role of secondary components in the numerical analysis and in-plane seismic performance assessment of glass curtain walls 二次构件在玻璃幕墙数值分析及面内抗震性能评价中的作用
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23453
Nicola Cella, Chiara Bedon
{"title":"Role of secondary components in the numerical analysis and in-plane seismic performance assessment of glass curtain walls","authors":"Nicola Cella, Chiara Bedon","doi":"10.21595/vp.2023.23453","DOIUrl":"https://doi.org/10.21595/vp.2023.23453","url":null,"abstract":"Glass façades are complex mechanical systems, in which brittle and vulnerable glass panels interact with metal members and secondary components. Under extreme design actions, such as seismic events, glass failure in tension (cracking) or compression (crushing) is a critical condition for structural performance assessment. Compared to full-scale experiments, in this regard, Finite Element (FE) numerical tools can offer a robust support in design. Besides, many primary and secondary façade components should be properly taken into account, because responsible of possible major approximations in their expected mechanical interactions. In this paper, the in-plane seismic response of glass curtain walls is investigated with geometrically accurate and detailed (“MREF”) or simplified and efficient (“MSIMP”) numerical models. Comparative results are critically discussed, based on dynamic numerical simulations, with a primary attention which is focused on the mechanical performance of glass panels.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128723","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
The removal of ammonia-nitrogen from aquaculture water based on cavitation effect of ultrasonic vibration 基于超声振动空化效应的水产养殖水中氨氮去除研究
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23575
Guo Fuyu, She Jianguo, Chen Ning
{"title":"The removal of ammonia-nitrogen from aquaculture water based on cavitation effect of ultrasonic vibration","authors":"Guo Fuyu, She Jianguo, Chen Ning","doi":"10.21595/vp.2023.23575","DOIUrl":"https://doi.org/10.21595/vp.2023.23575","url":null,"abstract":"This paper mainly studies the mechanism and efficiency of ammonia-nitrogen removal from circulating sewage in closed fish tank system. According to some factors affecting the removal efficiency (ultrasonic power, ultrasonic time and water oxygen concentration). Simulated circulating sewage mixed with oxygen through a venturi tube and then entered a closed experiment box for ultrasonic experiments. Finally, the removal efficiency was determined by Knott's reagent photometry. In the experiment, the PH value of the simulated sewage was 7.5, the indoor water temperature was 20 °C, and the free ammonia was selected as 0.02 mg/L (total ammonia-nitrogen was 1.6 mg/L) according to the standard. The experiment found that when the ultrasonic power is 400 W, the action time is 2 h, and the oxygen concentration of water is 23.8 mg/L, the efficiency of removing ammonia-nitrogen in water is about 65 %. When applied on fishing vessels, increasing the power can increase the removal efficiency.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128728","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
A new driving strategy for Lower limb-assisted exoskeleton robot 一种新的下肢辅助外骨骼机器人驱动策略
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23339
Jin Zhu, Qi Huang, Xuan Li, Xiaojun Zhou
{"title":"A new driving strategy for Lower limb-assisted exoskeleton robot","authors":"Jin Zhu, Qi Huang, Xuan Li, Xiaojun Zhou","doi":"10.21595/vp.2023.23339","DOIUrl":"https://doi.org/10.21595/vp.2023.23339","url":null,"abstract":"In this work, a control strategy is developed for a lower limb-assisted exoskeleton. To determine the current motion gait of the human body, the hip and knee joint angles, and plantar pressure values are sensed and analyzed, which are then used to actuate the exoskeleton to provide support for the hip and knee joints. The dual motion systems-the exoskeleton drive system and the human lower limb motion system-are established in this control approach. Without the need to first learn the user's gait, the assistance of the exoskeleton is provided by the motions of the human movement system and is sufficiently flexible to account for changes in step length and walking speed as the user moves through the gait cycle. Throughout this process, the exoskeleton system avoids providing power, providing the freedom to walk and stop in the course of our daily lives.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128735","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
Effect of an inter-vehicle damper on the dynamics of a high-speed train 车辆间阻尼器对高速列车动力学的影响
Vibroengineering PROCEDIA Pub Date : 2023-09-21 DOI: 10.21595/vp.2023.23375
Wenlin Wang, Shiping Liu, Dazhuo Wu
{"title":"Effect of an inter-vehicle damper on the dynamics of a high-speed train","authors":"Wenlin Wang, Shiping Liu, Dazhuo Wu","doi":"10.21595/vp.2023.23375","DOIUrl":"https://doi.org/10.21595/vp.2023.23375","url":null,"abstract":"It is meaningful to understand the effect of inter-vehicle damper and its parameters on high-speed train dynamics in the context of train inter-vehicle suspension design or optimization. In this study, Multi-body System (MBS) dynamics modelling of a high-speed CRH train with inter-vehicle damper is firstly carried out, in which a simplified-parametric model was proposed and validated to depict damping characteristics of the damper. Simulation results using the MBS model show that inter-vehicle damper devised in high-speed train can obviously reduce lateral vibrations at the connecting passage of adjacent compartments without increasing the wheelset lateral shift force and derailment coefficient, thus it can improve overal ride comfort of the CRH train. In addition, inter-vehicle damper can resist severe lateral shocks and guarantee safety when two high-speed trains pass each other. The developed MBS model of the CRH train is an accurate and useful platform, the obtained results in this study are also valuable in following vibration analysis and inter-vehicle suspension optimization of the CRH train.","PeriodicalId":262664,"journal":{"name":"Vibroengineering PROCEDIA","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128991","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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