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International Journal of Mechanics and Control最新文献

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Endurance analysis of Koepe pulleys with peripheral ribs 带外肋Koepe滑轮的耐久性分析
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.4.164
S. Wolny, Bogusław Ładecki
{"title":"Endurance analysis of Koepe pulleys with peripheral ribs","authors":"S. Wolny, Bogusław Ładecki","doi":"10.7494/MECH.2012.31.4.164","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.4.164","url":null,"abstract":"There are numerous hoisting installations operated in Polish mines that are equipped with winding gear incorporating a Koepe pulley reinforced with peripheral ribs, where the symptoms of fatigue cracking are often revealed. Current repairs of those areas help mitigate for this undesirable phenomenon for a short time only. In order to eliminate this problem, steps have been taken to identify the origins and propagation patterns of fatigue cracks in Koepe pulleys. A numerical model of a Koepe pulley is developed and the endurance analysis is performed by the FEM method, pre­ceded by a dynamic analysis of the normal duty cycle of the hoisting installation. The results of dynamic and endurance analyses are verified through experimental testing on a real object, involving force and stress measurements taken at selected points on the Koepe pulley. Those measurement data provide the background for the fatigue endurance assess­ment and new re-designs of the Koepe pulley structure.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"79 4 1","pages":"164"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87943403","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
Analysis of vibrations generated by the multi-body model of a planetary gear 行星齿轮多体模型振动分析
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.4.143
D. Dąbrowski, J. Adamczyk
{"title":"Analysis of vibrations generated by the multi-body model of a planetary gear","authors":"D. Dąbrowski, J. Adamczyk","doi":"10.7494/MECH.2012.31.4.143","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.4.143","url":null,"abstract":"In the paper the dynamic model of an one-stage planetary gear was presented. The model was developed on the basis of a multi-body dynamics method. To conduct dynamic simulations the specialized multi-body dynamics software was used. In the study the tests results for steady state operations of the planetary gear were presented. In the paper the meshing force signals were analyzed. The vibrations generated by the model consist of carrier and gear meshing frequency harmonics. On the spectra the amplitude modulations of the gear meshing frequencies harmonics were observed.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"46 1","pages":"143"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81010147","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: 3
DIRECTIONS OF EXTREME STIFFNESS AND STRENGTH IN LINEAR ELASTIC ANISOTROPIC SOLIDS 线弹性各向异性固体的极限刚度和强度方向
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.3.124
P. Szeptyński
{"title":"DIRECTIONS OF EXTREME STIFFNESS AND STRENGTH IN LINEAR ELASTIC ANISOTROPIC SOLIDS","authors":"P. Szeptyński","doi":"10.7494/MECH.2012.31.3.124","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.3.124","url":null,"abstract":"An investigation for directions of extreme - maximum or minimum - values of the longitudinal and transverse stiffness moduli as well as of the limit uniaxial and limit shear stresses in anisotropic linear elastic solids is performed in the pa­per. The cases of cubic symmetry (regular crystal system) and of volumetrically isotropic cylindrical symmetry (hexago­nal crystal system with additional constraints) are considered. The systems of non-linear equations for the components of the versors of investigated directions are derived with use of the spectral decomposition of the elasticity (stiffness and compliance) tensors.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"32 1","pages":"124"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81565758","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 POSSIBILITY OF USING PSEUDO-PHASE SPACE METHODS IN THE ANALYSIS OF THE POSITIVE DISPLACEMENT PUMP WEAR 伪相空间法分析容积泵磨损的可能性
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.3.115
J. Stojek
{"title":"THE POSSIBILITY OF USING PSEUDO-PHASE SPACE METHODS IN THE ANALYSIS OF THE POSITIVE DISPLACEMENT PUMP WEAR","authors":"J. Stojek","doi":"10.7494/MECH.2012.31.3.115","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.3.115","url":null,"abstract":"In this paper the possibility of tracking the evolution of reconstructed pseudo-phase portraits in the diagnosis of posi­tive-displacement pump wear has been presented. The reconstructed pseudo-phase portraits were obtained from vibra­tion signals measured in characteristic places on the pump casing and from the dynamic pressure graphs recorded in the output port of the pump during the passive test experiment. The recorded measurement concerned to tree state ofpump condition: in full working order, in part working order and pump with wear out elements.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"4 3 1","pages":"115"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76431192","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
YIELD STRESS MODIFICATION IN THE STRIP YIELD MODEL 条形屈服模型中的屈服应力修正
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.4.150
T. Machniewicz
{"title":"YIELD STRESS MODIFICATION IN THE STRIP YIELD MODEL","authors":"T. Machniewicz","doi":"10.7494/MECH.2012.31.4.150","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.4.150","url":null,"abstract":"From among of the deterministic models for fatigue crack growth predictions suitable for metallic materials a Strip Yield (SY) model can be considered the most general and powerful crack growth prediction tool owing to its applicability to arbitrary variable amplitude load histories. The SY model based on the conception of plasticity at the crack tip accord­ing to Dugdale, modified to accounting for the crack closure phenomena. The original Dugdale model is only valid for plane stress state conditions at the crack tip. Accounting for the triaxial stress conditions at the crack tip requires the yield stress modification, what is usually realized by using the suitable constraint factors. In the paper several concepts of the yield stress modification in the SY model have been described and notified. As it has been concluded the another important role of the constraint factors, in addition to accommodating in the SY model the triaxial stress state, is cover­ing indirectly various processes which do affect crack growth, but cannot be treated in a rigorous way.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"77 1","pages":"150"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75370682","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: 4
STRENGTH ANALYSIS OF A GANTRY CRANE OF A COATING STRUCTURE 涂装结构门式起重机强度分析
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.3.102
Bogusław Ładecki, S. Badura, F. Matachowski
{"title":"STRENGTH ANALYSIS OF A GANTRY CRANE OF A COATING STRUCTURE","authors":"Bogusław Ładecki, S. Badura, F. Matachowski","doi":"10.7494/MECH.2012.31.3.102","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.3.102","url":null,"abstract":"Gantry cranes with coating construction are used in Polish steel industry much less than truss bridges. For several bridges, which span and the supports have coating construction, there were made series of non-destructive testing, which revealed the presence of numerous fatigue cracks: in the area of a beam pad, the coating, as well as other ele­ments of their supporting structure. Periodically carried out repairs and strengthening of bridges have not eliminated the problem of the emergence of more fatigue cracks. The analysis of FEM, verified by extensometer measurements of strains, gave the basis to designate the most strenuous areas of the construction. Gathered results of periodic nonde­structive testing, combined with obtained results of FEM analysis, were the basis for designing appropriate reinforce­ments and indication the scope of conducting non-destructive testing of considered construction of bridges with coating.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"31 1","pages":"102"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86864789","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: 3
Prediction of elastic properties of polyurethane-infiltrated carbon foams 聚氨酯渗碳泡沫塑料弹性性能的预测
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.3.97
M. Janus-Michalska
{"title":"Prediction of elastic properties of polyurethane-infiltrated carbon foams","authors":"M. Janus-Michalska","doi":"10.7494/MECH.2012.31.3.97","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.3.97","url":null,"abstract":"This paper presents micromechanical approach to assessment of elastic properties of composite polyurethane-carbon foams. Analysis is based on specific choice of RVE combined with micro-macro transition. It leads to evaluation of strength and elastic constants of a composite. Foam behaviour is investigated numerically. Solid skeleton part shape is based on the tetrahedron cut out with spheres. 3D unit cell model is FE discetized. Calculations are performed for foams of selected densities using ABAQUS system. The comparison shows good agreement between the theoretical approach and experimental data. The presented method may be applied to design novel materials such as graphitized foam and nano composites and tailoring these materials for desired elastic properties.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"1 1","pages":"97"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83603190","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: 1
OBSERVATIONS ON FATIGUE CRACK GROWTH AND FATIGUE LIFE OF RIVETED LAP JOINTS 铆接搭接接头疲劳裂纹扩展及疲劳寿命观察
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.3.108
A. Skorupa, M. Skorupa, T. Machniewicz, A. Korbel
{"title":"OBSERVATIONS ON FATIGUE CRACK GROWTH AND FATIGUE LIFE OF RIVETED LAP JOINTS","authors":"A. Skorupa, M. Skorupa, T. Machniewicz, A. Korbel","doi":"10.7494/MECH.2012.31.3.108","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.3.108","url":null,"abstract":"Effects of variables related to design and production of riveted lap joints representative of longitudinal sheet connec­tions for a pressurized transport aircraft fuselage were experimentally investigated. The specimens from an aircraft Al alloy D16 Alclad sheets of three different thicknesses (1.9, 1.2 and 0.8 mm) were assembled under load control using round head rivets and rivets with the compensator from a P24 Al alloy. For the joints from 1.9 mm thick sheets fatigue tests indicated a dependency of the crack initiation site and crack path on the squeeze force level and on the rivet type. At the same time, increasing the squeeze force led to improved fatigue properties of the joints, specimens assembled using the rivets with the compensator showing fatigue lives consistently longer than joints with the round head rivets. All ob­served trends have been explained based on hole expansion and load transfer measurements. For thin sheets connected using the round head rivets, local deformations and indentations under the driven rivet head promoted crack initiation and failure in the adjacent sheet. Fatigue test results indicated that the detrimental effect of this type imperfections could outweigh the benefits associated with a decrease in secondary bending due to thinning the sheets. The rivets with the compensator were observed to cause significant local imperfections beneath the manufactured head, which adversely affected the joint fatigue performance.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"15 1","pages":"108"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78059945","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
WORM GEAR ANALYSIS IN TERMS OF NUMERICAL MODELLING 蜗轮蜗杆的数值模拟分析
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.4.133
M. Biegaj, K. Dziedziech, Adam Macheta
{"title":"WORM GEAR ANALYSIS IN TERMS OF NUMERICAL MODELLING","authors":"M. Biegaj, K. Dziedziech, Adam Macheta","doi":"10.7494/MECH.2012.31.4.133","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.4.133","url":null,"abstract":"A worm gear mechanism, widely used in numerous mechanical applications, is the essential component in energy ef­ficiency considerations. Compared to traditional gearboxes, worm gear is characterized by lower value of efficiency, provided by the manufacturers as 70-90%. However, the efficiency level can differ depending on the specific conditions of operation such as output torque, input rotational velocity, ambient temperature and type of lubrication. In order to analyse and simulate the worm gear mechanism in mechanical systems, it is essential to establish the actual efficiency value for specific conditions. The following article contains the description of efficiency test performed for the worm gear as a part of tram pantograph system studied in frame of ESTOMAD project. The aim of the experiment was to deter­mine the actual efficiency value of the transmission tested. The worm gear has been tested in an open loop configuration, therefore the efficiency has been determined basing on input and output torque and rotational velocity measurements. The tests have been performed for various output torques and input velocities to obtain view on losses in worm gear under different operational conditions, paying special attention to the velocity that drives the pantograph mechanism. The efficiency changes with the output torque variation, while the impact of rotational velocity level on the mentioned value is minimal. The results of measurements are used in modelling phase of worm gear component in 1D simulation environment, particularly creating new model and its correlation and validation.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"18 1","pages":"133-142"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82496490","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
MULTICHANNEL DATA ACQUISITION SYSTEM FOR VIBROACOUSTIC SIGNALS 振动声信号多通道数据采集系统
International Journal of Mechanics and Control Pub Date : 2012-01-01 DOI: 10.7494/MECH.2012.31.4.158
J. Piechowicz, P. Pawlik
{"title":"MULTICHANNEL DATA ACQUISITION SYSTEM FOR VIBROACOUSTIC SIGNALS","authors":"J. Piechowicz, P. Pawlik","doi":"10.7494/MECH.2012.31.4.158","DOIUrl":"https://doi.org/10.7494/MECH.2012.31.4.158","url":null,"abstract":"The authors have made an attempt to construct a multi-channel data acquisition system for vibroacoustic signals, col­lected for analysis of acoustic field distributions in enclosed rooms and determination of surface acoustic impedance values at the wall surfaces. The scope of the study required a synchronic registration of acoustic pressure by 24 mea­surement microphones, determination of the phase-shift angles between the measured signals and determination of the vibration velocity for the loudspeaker diaphragm. The paper presents the first stage of the research, directly related to the multi-channel system for registration and analysis of vibroacoustic signals. The constructed research tools, due to their modular structure, can be adapted to new tasks, extended by adding new elements (further measurement cards, microphones, accelerometers etc.), what ensures greatflexibility and suitability of the system for realization of advanced acoustical measurements. Open source code and users request for specialized acoustic analyses make the developed software packages a highly prospective research tool both for today and tomorrow.","PeriodicalId":38333,"journal":{"name":"International Journal of Mechanics and Control","volume":"157 1","pages":"158"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86726950","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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