Meccanica最新文献_第4页

Rarefaction pulses on tensegrity lattices are just $$text {sech}^2$$ -solitary (dark) waves 张力网格上的稀释脉冲只是$text {sech}^2$ -solitary（暗）波

IF 2.7 3区工程技术

Meccanica Pub Date : 2024-07-19 DOI: 10.1007/s11012-024-01853-8

Julia de Castro Motta, Fernando Fraternali, Giuseppe Saccomandi

{"title":"Rarefaction pulses on tensegrity lattices are just $$text {sech}^2$$ -solitary (dark) waves","authors":"Julia de Castro Motta, Fernando Fraternali, Giuseppe Saccomandi","doi":"10.1007/s11012-024-01853-8","DOIUrl":"https://doi.org/10.1007/s11012-024-01853-8","url":null,"abstract":"<p>This study investigates the propagation of rarefaction solitary waves in one-dimensional, tensegrity-like mass-spring lattices that are subject to an initial state of pre-compression. The analyzed systems exhibit a cubic interaction potential between adjacent masses that accurately captures the constitutive response of tensegrity prisms with elastically softening behavior. Analytical results are presented for the propagation of rarefaction solitary waves that produce a reduction of the initial prestress exhibited by the system. It is known in the literature that the use of cubic interaction potentials in one-dimensional lattices enables the prediction of the propagation of solitary waves with sech<span>(^2)</span> profile. Investigating the particular case of pre-compressed, softening-type tensegrity lattices, this study shows that such a noticeable result can be derived using both the classical and the improved Boussinesq equation. The given results reveal the presence of rarefaction solitary waves in a suitable range of wave speeds, and offer an explicit formula for the upper bound of the rarefaction wave speed that leaves the system in a compressed state. The outcomes of the present work pave the way to the development of analytic models for the design of radically new, metamaterial-type impact protection systems. Numerical simulations show the ability of the tensegrity-like model in predicting the propagation of rarefaction solitary waves in a physical model of a tensegrity mass-spring chain.</p>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"21 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141745723","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 stability and vibration isolation property of a foot-leg coupling bio-inspired vibration isolation structure 脚腿耦合生物启发隔振结构的动态稳定性和隔振性能

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-19 DOI: 10.1007/s11012-024-01858-3

Shihua Zhou, Pengyang Wang, Yunchao Zhou, Chenhui Zhou, Zichun Zhou, XinHai Yu

{"title":"Dynamic stability and vibration isolation property of a foot-leg coupling bio-inspired vibration isolation structure","authors":"Shihua Zhou, Pengyang Wang, Yunchao Zhou, Chenhui Zhou, Zichun Zhou, XinHai Yu","doi":"10.1007/s11012-024-01858-3","DOIUrl":"10.1007/s11012-024-01858-3","url":null,"abstract":"<div><p>Inspired that Kangaroo could buffer the shock and vibration from ground and keep the body and head steady and low/wide-frequency vibration isolation performance, a novel foot-leg coupling bio-inspired vibration isolation (FLBVI) system is proposed considering the synergy among skeleton, ligament/muscle and articulation. Based on the statics model, the static properties are investigated, and the idealized loading capacity and quasi-zero stiffness (QZS) range could be easily obtained by adjusting structure parameters. Combining with the dynamic model, the dynamic equation of the FLBVI structure is derived by Lagrange principle, and the nonlinear properties are analyzed by incremental harmonic balance method (IHBM). Based on verifying validity and feasibility of theoretical model with experiment results, the dynamic behaviors and vibration isolation performances of FLBVI structure are revealed from the visual angle of resonance characteristic and displacement transmissibility under different parameters. The results show that the FLBVI could availably reduce response amplitude, broaden the vibration isolation bandwidth, and then improve vibration isolation performance (below 5 Hz) and stability with proper parameters. The research of the FLBVI structure provides an innovative strategy of the designing bio-inspired vibration isolation structure.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 9","pages":"1499 - 1515"},"PeriodicalIF":1.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141745722","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 computed tomography-based limit analysis approach to investigate the mechanical behavior of the human femur prone to fracture 用基于计算机断层扫描的极限分析方法研究易骨折人体股骨的力学行为

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-07-17 DOI: 10.1007/s11012-024-01850-x

Cristina Falcinelli, Aurora Angela Pisano, Marcello Vasta, Paolo Fuschi

{"title":"A computed tomography-based limit analysis approach to investigate the mechanical behavior of the human femur prone to fracture","authors":"Cristina Falcinelli, Aurora Angela Pisano, Marcello Vasta, Paolo Fuschi","doi":"10.1007/s11012-024-01850-x","DOIUrl":"10.1007/s11012-024-01850-x","url":null,"abstract":"<div><p>The paper proposes a refined CT-based FE modelling strategy that implements a limit analysis numerical procedure, namely the Elastic Compensation Method (ECM), to estimate a lower bound to the collapse load of a human femur. In particular, the model geometry was obtained from CT images by segmentation of a fresh-frozen human cadaveric femur that was discretized with second-order tetrahedral 3D finite elements. A yield criterion of Tsai–Wu-type, expressed in principal stress space, was adopted to model the bone tissues for which the strength limit values in tension, compression and shear are computed locally from the femoral density distribution also derived from CT images. The developed CT-based numerical technique showed the ability to predict, at least for the examined femur for which the experimental collapse load is available, a lower bound to the collapse load. The proposed approach seems a promising and effective tool that could be adopted into clinical practice to predict the fracture risk of human femur starting from patient-specific data given by medical imaging.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 8","pages":"1301 - 1313"},"PeriodicalIF":1.9,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01850-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829995","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

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