Meccanica最新文献

Dynamics analysis of the round-wheel compound bow model

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-12-22 DOI: 10.1007/s11012-024-01929-5

Yanan He, Li He, Wei Li, Yongqiang Li, Weihua Liu, liang Liu

引用次数: 0

Multi-state meshing characteristics and global nonlinear dynamics of a spur gear system considering local tooth breakage

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-12-18 DOI: 10.1007/s11012-024-01924-w

Qing-Zhong Gong, Jian-Fei Shi, Wen-Hu Nan, Gang Zhao, Peng-Fei Qi

{"title":"Multi-state meshing characteristics and global nonlinear dynamics of a spur gear system considering local tooth breakage","authors":"Qing-Zhong Gong, Jian-Fei Shi, Wen-Hu Nan, Gang Zhao, Peng-Fei Qi","doi":"10.1007/s11012-024-01924-w","DOIUrl":"10.1007/s11012-024-01924-w","url":null,"abstract":"<div><p>The meshing state of a gear pair is significantly complex due to the presence of non-integer contact ratio and backlash, especially when there is a local tooth breakage (LTB). This paper presents the multi-state meshing behavior and global nonlinear dynamic characteristic of a spur gear pair with LTB. In order to obtain an accurate meshing state, a time-varying contact ratio considering LTB is calculated, and then nine meshing states and their boundary conditions are extracted. Later, a multi-state meshing nonlinear dynamic model incorporating the effect of LTB is developed. The time-varying meshing stiffness and load distribution coefficient considering LTB are calculated and analyzed in the time domain. Bifurcation and chaos characteristics of multi-state meshing behavior changing with meshing frequency under multi-initial values are studied. The global bifurcation of coexistence behavior is revealed based on the bifurcation dendrogram and basin of attraction. The result shows that LTB not only increases the dynamic meshing force but also changes the dynamic behavior if multi-state meshing occurs. Bifurcation and chaos induce multi-state meshing behavior. A special multi-initial bifurcation phenomenon, incomplete bifurcation, is found to be the primary factor contributing to the coexistence of attractors and parallel branches. This study provides a more accurate model for multi-state meshing and multi-initial bifurcation of a spur gear pair with LTB.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 1","pages":"119 - 140"},"PeriodicalIF":1.9,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108978","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 mechanical behavior of ice with different cotton contents 不同含棉量冰的动态力学行为

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-12-12 DOI: 10.1007/s11012-024-01915-x

Kai Guo, Yusen Zhang, Enling Tang, Zhiqiang Liang, Mengzhou Chang, Yafei Han, Chuang Chen, Liping He

{"title":"Dynamic mechanical behavior of ice with different cotton contents","authors":"Kai Guo, Yusen Zhang, Enling Tang, Zhiqiang Liang, Mengzhou Chang, Yafei Han, Chuang Chen, Liping He","doi":"10.1007/s11012-024-01915-x","DOIUrl":"10.1007/s11012-024-01915-x","url":null,"abstract":"<div><p>In order to study the dynamic compressive mechanical properties of hail, artificial ice specimens were prepared by adding cotton wool into deionized-distilled water. Dynamic compression experiments of ice specimens under different strain rates were carried out by using the Split Hopkinson Pressure Bar (SHPB). Furthermore, based on finite element software LS-DYNA, numerical simulations were conducted to evaluate applicability of mechanical parameters of ice under impact load. The results show that the specimens have a secondary loading phenomenon under the action of stress wave, and this phenomenon is more obvious with the increase of cotton content; under a given content of cotton and low strain rate, the compressive strength of ice is increased with the increasing of the strain rate; under high strain rate, the compressive strength of ice with 0% and 0.3% cotton is maintained as a constant, but a discrete result is observed for ice with 0.5% cotton; when the velocity of impact bar is in the range of 1.35–11.83 m/s, the compressive strengths of the specimens with cotton content of 0%, 0.3% and 0.5% are 3.3 MPa, 4 MPa and 8.1 MPa, respectively. Beyond that, morphology analysis shows that the edge of the specimen is damaged during impact process and the flying velocity of fragments increases with external force.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"59 11","pages":"2081 - 2095"},"PeriodicalIF":1.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875232","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 simple method for solving damped Duffing oscillators

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-12-11 DOI: 10.1007/s11012-024-01912-0

Stylianos Vasileios Kontomaris, Vassilis Alimisis, Anna Malamou, Georgios Chliveros, Christos Dimas

{"title":"A simple method for solving damped Duffing oscillators","authors":"Stylianos Vasileios Kontomaris, Vassilis Alimisis, Anna Malamou, Georgios Chliveros, Christos Dimas","doi":"10.1007/s11012-024-01912-0","DOIUrl":"10.1007/s11012-024-01912-0","url":null,"abstract":"<div><p>This paper investigates the accuracy of extending He’s frequency–amplitude equation to the damped Duffing oscillator. Exact numerical solutions are compared with analytical results obtained by extending He’s equation to damped oscillators for various values of amplitude (A) and damping coefficient (c). A simulation of the damped Duffing oscillator using a novel combination of two electrical circuits is also conducted, providing a real-world example of nonlinear oscillation. The oscillation period, calculated using He’s equation, is accurate for Ao < 1, where Ao represents the initial amplitude, regardless of c. The analytic solution is accurate only for Ao < 1 and c > 0.1. For smaller damping coefficients, discrepancies arise due to slow amplitude reduction and cumulative period calculation errors over time, necessitating a correction factor. For larger damping coefficients, the system quickly approaches the harmonic damping range, resulting in minor errors. In conclusion, the limits of applicability of He’s frequency–amplitude equation for damped Duffing oscillators were determined, and appropriate modifications were introduced.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 1","pages":"95 - 118"},"PeriodicalIF":1.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108383","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

On the effect of vertical motion of roll system upon dynamic behavior and stability of rolling mill

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-12-11 DOI: 10.1007/s11012-024-01917-9

Jin Wang, Eugenio Brusa, Yan Peng, Cristiana Delprete, Xiangyang Zhao, Xiaoli Xiang, Xinxiang Hou

{"title":"On the effect of vertical motion of roll system upon dynamic behavior and stability of rolling mill","authors":"Jin Wang, Eugenio Brusa, Yan Peng, Cristiana Delprete, Xiangyang Zhao, Xiaoli Xiang, Xinxiang Hou","doi":"10.1007/s11012-024-01917-9","DOIUrl":"10.1007/s11012-024-01917-9","url":null,"abstract":"<div><p>In some special rolling technologies, a key issue of the material processing is the roll motion along the vertical direction, since it is directly linked to stability of the whole system, and affects the product quality. To address this issue, this paper innovatively investigates the impact of roll motion on the dynamic characteristics of the system. The dynamic variation patterns of the process parameters under roll motion are first identified. It is known that a significant role on the system excitation is played by the process parameters. Therefore, the structure-process coupling strategy is applied to introduce the effect of roll motion into the system dynamics model, to confer its capability of predicting the real dynamic characteristics, for special rolling process. The multiscale small-parameter perturbation method is used to investigate the amplitude–frequency characteristics, and the system vibration response is found through a solution based on the Runge–Kutta method. Numeric results demonstrate that the roll motion significantly influences the system dynamic features, being showing a softening-type dynamic nonlinearity, under variation of many process parameters, which particularly affects the vibration amplitude and the degree of nonlinearity. The evolution of the system dynamic behavior in response to changes of mechanical and process parameters is then determined. The findings confirm the great influence of system parameters under roll motion condition upon the nonlinear dynamic features of the rolling mill. They provide a theoretical reference to set up the rolling process parameters and the system stability control in operation.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 1","pages":"73 - 93"},"PeriodicalIF":1.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108382","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

Force and pose control of a hemispherical ultrasonic probe in contact with viscoelastic gelatine

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-11-29 DOI: 10.1007/s11012-024-01921-z

Ludivina Facundo-Flores, Arturo Baltazar, Chidentree Treesatayapun

{"title":"Force and pose control of a hemispherical ultrasonic probe in contact with viscoelastic gelatine","authors":"Ludivina Facundo-Flores, Arturo Baltazar, Chidentree Treesatayapun","doi":"10.1007/s11012-024-01921-z","DOIUrl":"10.1007/s11012-024-01921-z","url":null,"abstract":"<div><p>Ultrasound probes are widely employed for internal sonification, to detect anomalies and assess mechanical properties. Achieving precise contact and orientation control is crucial for optimizing the transmission of acoustic energy into the test material. This study investigates the contact control of a hemispherical probe against a viscoelastic gelatin (tissue-like) test object. For small applied loads, the signals from the force sensor are often contaminated with noise. To enhance contact measurements, an ultrasound hemispherical probe was designed for Hertzian contact with gelatin. The transmitted/reflected acoustic energy is known to be a function of the contact area, which can be related to the applied force. The transmitted and reflected acoustic energy, which depends on the contact area, is related to the applied force. The goal is to develop an adaptive, model-free algorithm to control the contact force and orientation of the probe to maximize energy transfer. This algorithm integrates reflected acoustic energy at the contact interface with force data as feedback. A multi-input fuzzy controller scheme that is robust to noise and operates in real time is proposed. Numerical and experimental results demonstrate the controller’s stability and its ability to rapidly converge to the desired force and orientation conditions.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 1","pages":"39 - 54"},"PeriodicalIF":1.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-024-01921-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109842","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

Comparative study of elastic properties measurement techniques during plastic deformation of aluminum, magnesium, and titanium alloys: application to springback simulation

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-11-29 DOI: 10.1007/s11012-024-01918-8

J. A. Nietsch, A. C. Ott, G. Watzl, A. Cerny, F. J. Grabner, C. Grünsteidl, J. A. Österreicher

{"title":"Comparative study of elastic properties measurement techniques during plastic deformation of aluminum, magnesium, and titanium alloys: application to springback simulation","authors":"J. A. Nietsch, A. C. Ott, G. Watzl, A. Cerny, F. J. Grabner, C. Grünsteidl, J. A. Österreicher","doi":"10.1007/s11012-024-01918-8","DOIUrl":"10.1007/s11012-024-01918-8","url":null,"abstract":"<div><p>Reliable determination of the elastic moduli of metals can be quite demanding, especially as the apparent elastic modulus of metals is known to decrease with deformation. Traditionally, this dependence on plastic strain has been investigated through various tensile tests, but discrepancies persist across the different approaches. Here we compare several tensile test-based evaluation protocols based on loading-unloading experiments to measure the change in elastic moduli of the light metal alloys AZ31B, EN AW-6082, and Ti–6Al–4V during tensile deformation. Additionally, the initial Young’s modulus determination via tensile testing, three-point-bending experiments, contact-free laser ultrasonic zero-group-velocity plate resonance, and piezoelectric contact ultrasonic time-of-flight measurements were compared. The results reveal non-negligible differences in the strain-dependency of elastic moduli between the determination techniques. Additionally, the laser ultrasound measurements demonstrate an improved accuracy and repeatability for the determination of the initial elastic moduli of light metal sheets. The benefit of considering the reduction of the elastic moduli in finite element springback simulation of three-point-bending tests is demonstrated and the use of the chord modulus is found to be generally most appropriate.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 1","pages":"55 - 72"},"PeriodicalIF":1.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11785604/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143078417","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

Preface to the Special Issue of Meccanica “Sixty years of thermodynamics of continuous media (1963–2023)” 《力学》专刊《连续介质热力学六十年（1963-2023）》序言

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-11-17 DOI: 10.1007/s11012-024-01900-4

Vito Antonio Cimmelli, David Jou, Antonio Sellitto

引用次数: 0

A loaded tooth contact analysis (LTCA) model of profile modified gears

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-11-17 DOI: 10.1007/s11012-024-01905-z

Hongbing Wang, Can Yan, Changjiang Zhou, Bo Hu, Jianxiong Dong, Lairong Yin

{"title":"A loaded tooth contact analysis (LTCA) model of profile modified gears","authors":"Hongbing Wang, Can Yan, Changjiang Zhou, Bo Hu, Jianxiong Dong, Lairong Yin","doi":"10.1007/s11012-024-01905-z","DOIUrl":"10.1007/s11012-024-01905-z","url":null,"abstract":"<div><p>The contact pressure is a key parameter in the anti-wear and anti-contact fatigue design of the profile modified gears. In this work, a numerical contact model with high computational accuracy for profile modified gears is developed. The geometric model of the gears with profile modification was established based on the generating method and the tooth profile modification principle. The tooth profile modification quantity was regarded as a kind of tooth profile manufacturing error, and the tooth profile error in the direction of the line of action was derived. Then, the calculation models of the load sharing factor and the contact pressure of the profile modified gears was established. Finally, the influence of the modified tooth profile parameters on the load sharing factor between teeth and the contact pressure of the tooth surfaces was studied. The results are shown that sudden contact pressure occurs near the start point of the modification, and the moderate maximum tooth tip modification is helpful to reduce the contact pressure mutation in the alternating positions of single-tooth contact and double-tooth contact.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 1","pages":"17 - 37"},"PeriodicalIF":1.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109121","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

Design and simulation of a desk-size parallel kinematic machine for simulation of seismic events 用于模拟地震事件的台式并联运动机的设计与仿真

IF 1.9 3区工程技术

Meccanica Pub Date : 2024-11-15 DOI: 10.1007/s11012-024-01911-1

Sergio Pacioni, Luca Carbonari, Milena Martarelli, Massimo Callegari

引用次数: 0