Meccanica最新文献_第9页

Fluid–solid coupling analysis of the whole spiral organ of Corti 柯蒂氏整个螺旋器官的流固耦合分析

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-17 DOI: 10.1007/s11012-024-01761-x

Jiakun Wang, Junyi Liang, Bin Liu, Wenjuan Yao

{"title":"Fluid–solid coupling analysis of the whole spiral organ of Corti","authors":"Jiakun Wang, Junyi Liang, Bin Liu, Wenjuan Yao","doi":"10.1007/s11012-024-01761-x","DOIUrl":"10.1007/s11012-024-01761-x","url":null,"abstract":"<div><p>The complex fluid–solid coupling movement of macro–micro structures and lymphatic fluid in the cochlea plays a crucial role in the mechanism of sound perception in the human ear. However, previous studies have primarily focused on the macrostructure and overlooked the microstructure of the Organ of Corti (OC). In reality, the microstructure of the OC can regulate the vibration of the basilar membrane, which is important for sound perception. To address this, a three-dimensional spiral passive cochlear model containing a complete OC that conforms to the real physiology of the human ear was developed, but the significant amplification of its motion by the action of outer hair cells (OHC) in the living cochlea was not considered. The fluid–solid coupling calculations were conducted on this model, specifically examining the mechanical response of the OC microstructure and the pressure changes in the lymphatic fluid. The results showed that the lower stiffness structure in the OC has a lower stress level, which contributes to the realization of sound perception. As the frequencies increases, the region of peak stress and displacement in the OHC moves from the apex to the base of the cochlea, reflecting frequency-selective characteristics. The tunnel of the OC amplifies pressure waves at specific locations, enabling more accurate frequency recognition. Furthermore, the presence of the OC not only causes significant radial differences in lymphatic fluid pressure in the scala vestibule, but also enhances internal cochlear vibration, playing an undeniable regulatory role in the sound perception.Kindly check and verify edit made in article title.We have checked and verified the editing in the article title.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 9","pages":"1465 - 1479"},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A novel method of reconstructing planar flow field from given distribution of single velocity component: comparison to conventional divergence-free approach 从给定的单一速度分量分布重建平面流场的新方法：与传统无发散方法的比较

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-17 DOI: 10.1007/s11012-024-01771-9

Kenjiro Shimano, Suguru Shiratori, Hideaki Nagano

{"title":"A novel method of reconstructing planar flow field from given distribution of single velocity component: comparison to conventional divergence-free approach","authors":"Kenjiro Shimano, Suguru Shiratori, Hideaki Nagano","doi":"10.1007/s11012-024-01771-9","DOIUrl":"10.1007/s11012-024-01771-9","url":null,"abstract":"<div><p>Measurements of a single flow velocity component are still prevalent due to their reasonable costs and some difficulties in multiple-component measurements. If the transverse component can be obtained additionally by a numerical technique, qualitative features of the flow will be understood more effectively. In this context, methods based on the 2-dimensonal divergence-free assumption have been widely used for problems in which a single velocity component is measured over a planar domain. In this study, the authors proposed a method of approximating the second planar velocity component by minimising an objective function expressed with divergence and vorticity so that the mass transport in the out-of-plane direction could be taken into consideration. The present method was tested with numerically produced 3-dimensional flows in a hexahedral chamber and a flow around a bluff body measured by particle image velocimetry. There was a tendency that the present method calculated the second velocity component with smaller errors than existing divergence-free approaches. It was also shown that the present method had a high capability to locate strong suction and generation caused by the mass transport in the out-of-plane direction. The present method is deemed promising for many one-component flow measurements in engineering and medicine.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 7","pages":"1191 - 1227"},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01771-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141830023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural response of half-scale pumice concrete masonry building: shake table/ambient vibration tests and FE analysis 半比例浮石混凝土砌体建筑的结构响应：振动台/环境振动试验和有限元分析

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-08 DOI: 10.1007/s11012-024-01849-4

Ali Kaya, Boudjamaa Roudane, Süleyman Adanur, Fezayil Sunca, Ali Fuat Genç, Murat Gunaydin, Ahmet Can Altunişik

{"title":"Structural response of half-scale pumice concrete masonry building: shake table/ambient vibration tests and FE analysis","authors":"Ali Kaya, Boudjamaa Roudane, Süleyman Adanur, Fezayil Sunca, Ali Fuat Genç, Murat Gunaydin, Ahmet Can Altunişik","doi":"10.1007/s11012-024-01849-4","DOIUrl":"10.1007/s11012-024-01849-4","url":null,"abstract":"<div><p>Seismic performance evaluation of masonry structures is of paramount importance for ensuring the safety and resilience of buildings in earthquake-prone regions. There are limited number of studies on pumice elements in the literature. In addition, there are almost no studies investigating the earthquake behavior of pumice masonry building as a whole structure. In this context, a comprehensive understanding of their seismic response and dynamic characteristics has been lacking. To address this knowledge gap, a shake-table experimental campaign was undertaken, wherein half-scale pumice masonry building was exposed to simulated seismic forces. To enhance the experimental findings, numerical simulations were performed to confirm and expand our comprehension of how the pumice masonry structure responds to dynamic forces. Integrating both experimental and numerical outcomes provides a holistic understanding of how pumice masonry buildings behave during seismic events. At the end of the experimental study, the frequency values of the pumice model were observed to decrease up to 23.5% in the modes compared to the undamaged state. In the numerical model, this value decreases up to 19.85%. For the undamaged and damaged model, the first three experimental mode shapes were similar to the numerical mode shapes. Both experimental and numerical results show that the expected damages occur in the same regions. These results show that nonlinear FE models can be helpful in determining potential damage model locations. The findings have implications for the seismic design and retrofitting of similar traditional masonry buildings, facilitating the development of resilient and sustainable engineering solutions in seismic-prone regions.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 7","pages":"1159 - 1190"},"PeriodicalIF":1.9,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01849-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimal design of inerter-based absorbers with amplified inertance: from the improved tuned liquid column damper inerter (ITLCDI) to the improved tuned mass damper inerter (ITMDI) and improved tuned inerter damper (ITID) 具有放大惰性的基于阻尼器的吸收器的优化设计：从改进型调谐液柱阻尼器阻尼器 (ITLCDI) 到改进型调谐质量阻尼器阻尼器 (ITMDI) 和改进型调谐阻尼器阻尼器 (ITID)

IF 2.7 3区工程技术

Meccanica Pub Date : 2024-07-07 DOI: 10.1007/s11012-024-01834-x

Chiara Masnata, Antonina Pirrotta

{"title":"Optimal design of inerter-based absorbers with amplified inertance: from the improved tuned liquid column damper inerter (ITLCDI) to the improved tuned mass damper inerter (ITMDI) and improved tuned inerter damper (ITID)","authors":"Chiara Masnata, Antonina Pirrotta","doi":"10.1007/s11012-024-01834-x","DOIUrl":"https://doi.org/10.1007/s11012-024-01834-x","url":null,"abstract":"<p>This paper presents the optimal design of improved inerter-based absorbers to effectively mitigate vibrations in structural systems. The improvement of the inerter is achieved by integrating it within a rhombus truss, composed of rigid rods interconnected by hinges. This arrangement exploits the geometrical amplification effect to enhance inertial properties, thus leading to superior control performance. Specifically, both ends of the inerter are anchored to opposite points along one diagonal of the rhombus, while along the other diagonal, one end is grounded, and the other is linked to the structural system itself or other mechanical systems. The motion of these systems triggers the activation of the inerter, contributing to vibration dissipation. Previous studies have combined this improved inerter with a spring-dashpot unit proposing the so-called Improved Tuned Inerter Damper (ITID). Extending prior research, this study integrates the improved inerter with common passive control devices, such as the Tuned Liquid Column Damper (TLCD) and Tuned Mass Damper (TMD), resulting in the development of the novel Improved Tuned Liquid Column Damper Inerters (ITLCDI) and Improved Tuned Mass Damper Inerter (ITMDI). The optimal calibration for the ITLCDI through an analytical approach is presented, assuming stochastic processes for modeling seismic actions. Furthermore, it discusses how the ITLCDI configuration can be adapted to yield the ITMDI and ITID configurations, providing closed-form solutions for all three absorbers. Validation of the proposed method is performed through numerical simulations, with a thorough analysis conducted to assess the effectiveness of the ITLCDI relative to the ITMDI and ITID configurations.</p>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"23 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141546364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Chaotic dynamics of a continuous and discrete generalized Ziegler pendulum 连续和离散广义齐格勒摆的混沌动力学

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-05 DOI: 10.1007/s11012-024-01848-5

Stefano Disca, Vincenzo Coscia

引用次数: 0

Active design method and performance prediction of internal gear pairs with low sliding ratio 低滑动比内齿轮副的主动设计方法和性能预测

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-04 DOI: 10.1007/s11012-024-01845-8

Wei Sheng, Zhengminqing Li, Xiaofeng Yu, Rongsheng Xi

引用次数: 0

CFD simulation of a Rushton turbine stirred-tank using open-source software with critical evaluation of MRF-based rotation modeling 使用开源软件对 Rushton 涡轮搅拌罐进行 CFD 模拟，并对基于 MRF 的旋转建模进行重要评估

IF 2.7 3区工程技术

Meccanica Pub Date : 2024-07-03 DOI: 10.1007/s11012-024-01824-z

Alfred Reid, Riccardo Rossi, Ciro Cottini, Andrea Benassi

{"title":"CFD simulation of a Rushton turbine stirred-tank using open-source software with critical evaluation of MRF-based rotation modeling","authors":"Alfred Reid, Riccardo Rossi, Ciro Cottini, Andrea Benassi","doi":"10.1007/s11012-024-01824-z","DOIUrl":"https://doi.org/10.1007/s11012-024-01824-z","url":null,"abstract":"<p>A critical evaluation of the impact of the Multiple Reference Frame (MRF) technique on steady RANS simulations of a Rushton turbine stirred-tank is presented. The analysis, based on the open-source software OpenFOAM, is focused on the choice of the diameter and thickness of the MRF region and on their effect on the predicted velocity field and mixing times in the tank. Five diameters of the MRF region are compared for the same operating conditions of the turbine, showing limited differences in velocity profiles, which are found in general good agreement with available experimental data. Significant differences are nonetheless found in the predicted levels of turbulence intensity within the tank, with a considerable amount of artificially generated turbulence at the boundary of the MRF region for the largest diameters. The impact of the different predictions of the turbulent field on the modeling of the mixing process in the tank is evaluated by simulating the release of a passive scalar, using the frozen-flow field hypothesis. The results show changes in mixing times up to a factor of three when comparing MRF regions of different sizes. Thus, the present investigation highlights the importance of assessing the effect of the MRF zone size on numerical results as a standard practice in RANS based simulations of stirred-tanks.</p>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Hybrid film cooling geometry analysis with OpenFOAM 利用 OpenFOAM 进行混合薄膜冷却几何分析

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-03 DOI: 10.1007/s11012-024-01836-9

Ilyes Belouddane, Mohammed Hamel, Azzeddine Khorsi

{"title":"Hybrid film cooling geometry analysis with OpenFOAM","authors":"Ilyes Belouddane, Mohammed Hamel, Azzeddine Khorsi","doi":"10.1007/s11012-024-01836-9","DOIUrl":"10.1007/s11012-024-01836-9","url":null,"abstract":"<div><p>This paper presents a numerical investigation of the film cooling performance of a new hybrid film cooling geometry. The new hybrid concept was created to enhance the film cooling performance of gas turbine blade. The scheme consists of a converging slot hole or console with a cylindrical hole featuring a branching cylindrical hole. An analysis of the cooling performance of the advanced hybrid film cooling model was carried out across blowing ratios of (B = 0.37, 0.60, and 0.87) at a density ratio of DR=1. A numerical simulation was performed using open-source CFD software OpenFOAM. The validity of the current numerical model was evaluated for the console case, revealing excellent agreement between the numerical results and the experimental data. In this study, two distinct forms, F1 and F2, are represented with the same position variation; the SST K − <span>({omega })</span> turbulence model was selected as the turbulence model for the analysis. The results show that the hybrid concepts, including auxiliary jets, enhance film cooling efficiency by effectively dispersing coolant across downstream surfaces and reducing the impact of the counter-rotating vortex pair by improving mixing with the mainstream flow. Furthermore, the supplementary jet ensures the primary coolant jet moves beside the test surface, which results in higher effectiveness, especially at high blowing ratios.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 7","pages":"1103 - 1119"},"PeriodicalIF":1.9,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141546365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Hybrid damping control of magnetorheological semi-active suspension based on feedback linearization Kalman observer 基于反馈线性化卡尔曼观测器的磁流变半主动悬架混合阻尼控制

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-01 DOI: 10.1007/s11012-024-01827-w

Yu Jiang, Ruochen Wang, Dong Sun, Renkai Ding, Lin Yang

{"title":"Hybrid damping control of magnetorheological semi-active suspension based on feedback linearization Kalman observer","authors":"Yu Jiang, Ruochen Wang, Dong Sun, Renkai Ding, Lin Yang","doi":"10.1007/s11012-024-01827-w","DOIUrl":"10.1007/s11012-024-01827-w","url":null,"abstract":"<div><p>To improve the dynamic performances of nonlinear magnetorheological (MR) semi-active suspension, a hybrid damping control (HDC) based on Kalman observer of nonlinear suspension system is proposed. Firstly, the mechanical test of MR damper is carried out, and the mechanical model of MR damper and suspension system model are established. On this basis, a feedback linearization Kalman observer (FLKO) based on differential geometry theory is designed. Then, the working modes of the MR suspension system are divided according to different driving roads. HDC is proposed to achieve the dynamic control objectives under different working modes, and genetic algorithm is used to optimize the coefficients of skyhook, groundhook and distribution. The simulation results show that the estimation accuracy of FLKO is more than 85%. Compared with passive suspension, the tire dynamic load is optimized by 15.53% on A class road, improving the road holding. On B class road, the body acceleration, suspension deflection and tire dynamic load are optimized by 2.22%, 23.76% and 1.47% respectively, optimizing the dynamic performances comprehensively. On C class road, the body acceleration is optimized by 17.69%, improving the ride comfort effectively. Finally, a test bench is built, and the test results are basically consistent with simulation, which verifies the effectiveness of the designed FLKO and HDC.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 7","pages":"1087 - 1102"},"PeriodicalIF":1.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Dynamic characteristics of rotor system with parallel and angular misaligned involute spline coupling 带有平行和角度错位渐开线花键联轴器的转子系统的动态特性

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-06-27 DOI: 10.1007/s11012-024-01842-x

Xueyang Miao, Dong Jiang, Xing Ai, Fujian Xu, Dahai Zhang, Qingguo Fei

{"title":"Dynamic characteristics of rotor system with parallel and angular misaligned involute spline coupling","authors":"Xueyang Miao, Dong Jiang, Xing Ai, Fujian Xu, Dahai Zhang, Qingguo Fei","doi":"10.1007/s11012-024-01842-x","DOIUrl":"10.1007/s11012-024-01842-x","url":null,"abstract":"<div><p>Spline couplings are commonly used to transfer rotary motion in rotating structures, such as low-pressure rotor systems in dual-rotor aero-engines. The misalignment introduced by spline coupling assembly error will seriously affect the safe operation of rotor system. In this paper, a method is proposed to calculate the spline meshing stiffness under arbitrary misalignment conditions, considering the static and dynamic misalignment. The accurate meshing parameters of spline couplings under parallel and angular misalignments were determined by computing the effective meshing region of misaligned spline teeth. Furthermore, a time-varying stiffness-damping spline model is established, considering friction on the spline teeth surfaces, to derive the dynamic model of the spline-rotor system under arbitrary misalignment conditions. The Newmark-<i>β</i> method, in conjunction with the Newton–Raphson method, was used to solve the dynamic response of the system, and the correctness of the model was verified by experiments. Finally, the variation of spline meshing stiffness and force caused by static and dynamic misalignment is described, and the effects of parallel and angular misalignment, as well as the phase difference in unbalance, on the vibration response and self-excited vibrations are also investigated.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 7","pages":"1061 - 1085"},"PeriodicalIF":1.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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