Pub Date : 2022-10-30DOI: 10.1177/14644193221134161
Ji-Tae Kim, Dongu Im, Hyuek-Jin Choi, Jaewon Oh, Jaho Seo, Young-Jun Park
In this study, the design and driving performance evaluation of a driving system for driving on deformable terrain was performed using terramechanics theory and multi-body dynamics simulation. For the design of the driving system, the mechanical interaction of track-terrain was analyzed using a Bekker-based model. Based on the analyzed results, the design of a track suitable for the deformable terrain to be driven and selection of a power source (engine, transmission, etc.) were carried out. A multi-body simulation model of the tracked vehicle reflecting the designed track and the selected power source was developed, and a ground model reflecting the mechanical property of terrain was also developed to analyze the mechanical interaction of the track-terrain through simulation. In addition, each link constituting the track was modeled as a 6 DOF spring/damper system to consider the track's tension force and load distribution under the track, and through this, different ground pressure and soil thrust were applied according to the motion state of each link. Finally, driving performance analyses were performed using the developed tracked vehicle, and as a result, it was confirmed that the driving requirements of the tracked vehicle were satisfied.
{"title":"Multi-body dynamics modeling and driving performance evaluation of oil recovery vehicle","authors":"Ji-Tae Kim, Dongu Im, Hyuek-Jin Choi, Jaewon Oh, Jaho Seo, Young-Jun Park","doi":"10.1177/14644193221134161","DOIUrl":"https://doi.org/10.1177/14644193221134161","url":null,"abstract":"In this study, the design and driving performance evaluation of a driving system for driving on deformable terrain was performed using terramechanics theory and multi-body dynamics simulation. For the design of the driving system, the mechanical interaction of track-terrain was analyzed using a Bekker-based model. Based on the analyzed results, the design of a track suitable for the deformable terrain to be driven and selection of a power source (engine, transmission, etc.) were carried out. A multi-body simulation model of the tracked vehicle reflecting the designed track and the selected power source was developed, and a ground model reflecting the mechanical property of terrain was also developed to analyze the mechanical interaction of the track-terrain through simulation. In addition, each link constituting the track was modeled as a 6 DOF spring/damper system to consider the track's tension force and load distribution under the track, and through this, different ground pressure and soil thrust were applied according to the motion state of each link. Finally, driving performance analyses were performed using the developed tracked vehicle, and as a result, it was confirmed that the driving requirements of the tracked vehicle were satisfied.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"33 1","pages":"74 - 85"},"PeriodicalIF":1.8,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75195604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-12DOI: 10.1177/14644193221129149
Matt Simpson, N. Dolatabadi, N. Morris, R. Rahmani, David Jones, Christopher Craig
Constant Velocity Joint (CVJ) mechanisms enable torque transmission between two shafts at a fixed or variable angle. Cross groove CVJs are typically used in high performance automotive applications due to their versatility and light weight. Critical failure modes, such as pitting or abrasive wear, occur due to the harsh tribological conditions at ball reversals. In this research, an existing mathematical model is developed further for the case of cross groove CVJs including an accurate contact mechanics model. The developed model is validated against a published data set from literature. Surface topography of worn raceways are experimentally measured and the results from the developed model are corroborated with the measured surface parameters. This improved model shows the correlations between predicted contact force variation and wear scar depths during ball reversals, hitherto not reported in the literature.
{"title":"Analysis of a cross groove constant velocity joint mechanism designed for high performance racing conditions","authors":"Matt Simpson, N. Dolatabadi, N. Morris, R. Rahmani, David Jones, Christopher Craig","doi":"10.1177/14644193221129149","DOIUrl":"https://doi.org/10.1177/14644193221129149","url":null,"abstract":"Constant Velocity Joint (CVJ) mechanisms enable torque transmission between two shafts at a fixed or variable angle. Cross groove CVJs are typically used in high performance automotive applications due to their versatility and light weight. Critical failure modes, such as pitting or abrasive wear, occur due to the harsh tribological conditions at ball reversals. In this research, an existing mathematical model is developed further for the case of cross groove CVJs including an accurate contact mechanics model. The developed model is validated against a published data set from literature. Surface topography of worn raceways are experimentally measured and the results from the developed model are corroborated with the measured surface parameters. This improved model shows the correlations between predicted contact force variation and wear scar depths during ball reversals, hitherto not reported in the literature.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"13 1","pages":"16 - 33"},"PeriodicalIF":1.8,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90407958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-09DOI: 10.1177/14644193221127659
Ghasem Maghsoudi Gharehbolagh, Abbas Rohani Bastami, P. Safarpour, Y. Abbaszadeh
Torsional vibration of the power transmission system is one of the main factors which affects ride comfort and fatigue of the driveline components. These vibrations are caused by periodic changes in the gas pressure and inertial forces. To reduce these vibrations, dual mass flywheels (DMF) are used in some vehicles. DMFs are usually modelled as two disks connected with linear springs. However large rotation angle in DMFs can invalidate linear assumption. In this research, torsional vibration of a three-cylinder engine with nonlinear DMF is investigated and an analytical solution is obtained for the governing nonlinear equations of torsional vibrations under real engine torsional excitation for the first time. It should be noted that in the previous works, the torsional vibration equations of the DMF had been solved numerically. Analytical solution helps to study the effect of design parameters of DMF more easily. It is shown that the analytical and numerical solutions are well matched in steady-state conditions. Finally, a parametric study is performed and the effects of design parameters on the oscillation amplitude of the engine speed and flywheel output speed are presented.
{"title":"Nonlinear analysis of torsional vibrations of dual mass flywheel in a three-cylinder engine","authors":"Ghasem Maghsoudi Gharehbolagh, Abbas Rohani Bastami, P. Safarpour, Y. Abbaszadeh","doi":"10.1177/14644193221127659","DOIUrl":"https://doi.org/10.1177/14644193221127659","url":null,"abstract":"Torsional vibration of the power transmission system is one of the main factors which affects ride comfort and fatigue of the driveline components. These vibrations are caused by periodic changes in the gas pressure and inertial forces. To reduce these vibrations, dual mass flywheels (DMF) are used in some vehicles. DMFs are usually modelled as two disks connected with linear springs. However large rotation angle in DMFs can invalidate linear assumption. In this research, torsional vibration of a three-cylinder engine with nonlinear DMF is investigated and an analytical solution is obtained for the governing nonlinear equations of torsional vibrations under real engine torsional excitation for the first time. It should be noted that in the previous works, the torsional vibration equations of the DMF had been solved numerically. Analytical solution helps to study the effect of design parameters of DMF more easily. It is shown that the analytical and numerical solutions are well matched in steady-state conditions. Finally, a parametric study is performed and the effects of design parameters on the oscillation amplitude of the engine speed and flywheel output speed are presented.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"11 1","pages":"3 - 15"},"PeriodicalIF":1.8,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90576655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-29DOI: 10.1177/14644193221129648
S. Yan, Qiong Qu, Minghui Liu, Yubing Zhang, Chunlan Yu, Fengtao Wang
As one of the bearing vibration sources, cage motions were often investigated for distinguishing the bearing performance. However, when the ball bearing works under complex conditions, there may be clearance fit between outer ring and housing, cage motions are affected seriously, which is less considered in previous studies. Thus, a dynamic model for the ball bearing with clearance fit was proposed, and effects of clearance fit on the cage motions were studied. The constructed model is verified by the experiment in the literature. In the obtained results, the whirl orbit, poincare map, cage velocity deviation ratio were given for defining the whirl stability of cage motions. The cage whirl stability declined with the enlargement of clearance fit and initial contact angle. Whereas, the cage whirl stability enhanced with the increasing guiding clearance. The above results may offer some advice for the design and using of angular contact ball bearing.
{"title":"Investigation on cage motions in high speed angular contact ball bearing with clearance fit between the outer ring and housing","authors":"S. Yan, Qiong Qu, Minghui Liu, Yubing Zhang, Chunlan Yu, Fengtao Wang","doi":"10.1177/14644193221129648","DOIUrl":"https://doi.org/10.1177/14644193221129648","url":null,"abstract":"As one of the bearing vibration sources, cage motions were often investigated for distinguishing the bearing performance. However, when the ball bearing works under complex conditions, there may be clearance fit between outer ring and housing, cage motions are affected seriously, which is less considered in previous studies. Thus, a dynamic model for the ball bearing with clearance fit was proposed, and effects of clearance fit on the cage motions were studied. The constructed model is verified by the experiment in the literature. In the obtained results, the whirl orbit, poincare map, cage velocity deviation ratio were given for defining the whirl stability of cage motions. The cage whirl stability declined with the enlargement of clearance fit and initial contact angle. Whereas, the cage whirl stability enhanced with the increasing guiding clearance. The above results may offer some advice for the design and using of angular contact ball bearing.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"119 1","pages":"86 - 97"},"PeriodicalIF":1.8,"publicationDate":"2022-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87984808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-26DOI: 10.1177/14644193221125543
Jun Liu, Zhenkun Yan, Mingming Lu, Liang Zhang, Taowen Cui, M. Zheng, Di Wu
An unmanned deformable vehicle, which is a new type of robot combining a car and a robot, can drive at high speed with wheels and walk with steps. An unmanned deformable vehicle is prone to tipping instability when reconfigured between the automotive and humanoid states. The following work reported herein addresses these issues. The kinematic model of an unmanned deformed vehicle during the coupled reconfiguration process was established. The zero moment point (ZMP) theory was used as the stability criterion, and based on the requirement for stability during the reconstruction process, a genetic algorithm was used to find the optimal value of the support state foot landing position for the parking and driving coupled reconfiguration, and for the optimal value of the driving acceleration of the deformed vehicle during the driving coupled reconfiguration. On the basis of the optimal foot landing position, the total reconfiguration time threshold, deformed vehicle driving acceleration threshold, and support surface tilt angle threshold were analysed and calculated in accordance with stability requirements during the reconfiguration. Finally, the stability performance of the optimised system was verified through prototype testing.
{"title":"Stability analysis and design of an unmanned deformable vehicle during coupled reconfiguration motion","authors":"Jun Liu, Zhenkun Yan, Mingming Lu, Liang Zhang, Taowen Cui, M. Zheng, Di Wu","doi":"10.1177/14644193221125543","DOIUrl":"https://doi.org/10.1177/14644193221125543","url":null,"abstract":"An unmanned deformable vehicle, which is a new type of robot combining a car and a robot, can drive at high speed with wheels and walk with steps. An unmanned deformable vehicle is prone to tipping instability when reconfigured between the automotive and humanoid states. The following work reported herein addresses these issues. The kinematic model of an unmanned deformed vehicle during the coupled reconfiguration process was established. The zero moment point (ZMP) theory was used as the stability criterion, and based on the requirement for stability during the reconstruction process, a genetic algorithm was used to find the optimal value of the support state foot landing position for the parking and driving coupled reconfiguration, and for the optimal value of the driving acceleration of the deformed vehicle during the driving coupled reconfiguration. On the basis of the optimal foot landing position, the total reconfiguration time threshold, deformed vehicle driving acceleration threshold, and support surface tilt angle threshold were analysed and calculated in accordance with stability requirements during the reconfiguration. Finally, the stability performance of the optimised system was verified through prototype testing.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"44 1","pages":"639 - 659"},"PeriodicalIF":1.8,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83725983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-23DOI: 10.1177/14644193221121975
Chenyuan Ma, Daoli Zhao, W. Liao, Weipeng Sun, P. Guo, Yanhe Xu
Turbogenerator sets, the indispensible rotating machinery in thermal power plants, can be simplified into a dual-rotor bearing system. In this case, its nonlinear phenomenon largely results from the unbalanced magnetic pull (UMP) and the nonlinear oil film forces, which, however, are not well understood. In this study, a mathematical model for a dual-rotor bearing system is established, the effects of the UMP and the oil-film forces on its nonlinear phenomenon are investigated creatively. Of which, the UMP force is initially calculated by the integration of the air-magnetic energy, and the short journal bearing assumption is employed to derive the oil-film force. The fitness of the developed model is validated through the stability experiments of a 660 MW turbogenerator set. Results indicate that in the idling condition, nonlinear phenomenon of the system can be described as the period-1 and quasi-periodic motions as the rotational speed rises. At low speeds, the amplitude of oil whirl appears. With the rising rotational speed, the oil whirl turns into oil whip in the second quasi-periodic. Interestingly, the electromagnetic force can greatly alleviate the system amplitude and enhance its stability considering the UMP force. The nonlinear effect of air-gap distance of the system under load conditions is also investigated. The system is still in the quasi-periodic state with the increasing air-gap distance at low/high speed. But the system is still unstable owing to oil whirl/whip and UMP force, causing the system experiences multiple states and becomes more stable at the intermediate speed.
{"title":"Effect of the unbalanced magnetic pull force and oil-film force on nonlinearity of a dual-rotor bearing system","authors":"Chenyuan Ma, Daoli Zhao, W. Liao, Weipeng Sun, P. Guo, Yanhe Xu","doi":"10.1177/14644193221121975","DOIUrl":"https://doi.org/10.1177/14644193221121975","url":null,"abstract":"Turbogenerator sets, the indispensible rotating machinery in thermal power plants, can be simplified into a dual-rotor bearing system. In this case, its nonlinear phenomenon largely results from the unbalanced magnetic pull (UMP) and the nonlinear oil film forces, which, however, are not well understood. In this study, a mathematical model for a dual-rotor bearing system is established, the effects of the UMP and the oil-film forces on its nonlinear phenomenon are investigated creatively. Of which, the UMP force is initially calculated by the integration of the air-magnetic energy, and the short journal bearing assumption is employed to derive the oil-film force. The fitness of the developed model is validated through the stability experiments of a 660 MW turbogenerator set. Results indicate that in the idling condition, nonlinear phenomenon of the system can be described as the period-1 and quasi-periodic motions as the rotational speed rises. At low speeds, the amplitude of oil whirl appears. With the rising rotational speed, the oil whirl turns into oil whip in the second quasi-periodic. Interestingly, the electromagnetic force can greatly alleviate the system amplitude and enhance its stability considering the UMP force. The nonlinear effect of air-gap distance of the system under load conditions is also investigated. The system is still in the quasi-periodic state with the increasing air-gap distance at low/high speed. But the system is still unstable owing to oil whirl/whip and UMP force, causing the system experiences multiple states and becomes more stable at the intermediate speed.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"33 1","pages":"623 - 638"},"PeriodicalIF":1.8,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80087968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-15DOI: 10.1177/14644193221125093
Isaac Chairez, Y. Alsmadi, Pamela Vera-Tizatl, Karla Rincón-Martínez
This paper describes the design and implementation of a novel adaptive control method to track a set of bioinspired reference trajectories. These references define anthropomorphic movements for an exoskeleton robot. The proposed controller implemented the adjustment laws for the variable gains of a state feedback (Proportional-Derivative type) structure. The method to adjust the adaptive gains was determined using a controlled Lyapunov function. The adaptation laws use velocity estimation based on a robust exact differentiator (RED) implemented as a variation of a distributed Super-Twisting algorithm. The adaptive gain controller was evaluated on a simulated exoskeleton structure. The set of simulations considered the presence of external disturbances and modeling uncertainties. The controller proved efficient in rejecting external perturbations/uncertainties affecting the exoskeleton. The proposed controller’s performance was superior to the one obtained if the standard fixed-gain proportional derivative controller was evaluated. As an additional benefit of the adaptive PD controller implementation, a controller power reduction of at least 14 % concerning the non-adaptive version of the feedback controller was attained. An experimental evaluation of the proposed controller confirmed the benefits of the proposed controller with adaptive gains. The successful tracking of nine different biomechanically inspired reference trajectories justified the exoskeleton application, which could be used as a potential tool for rehabilitation purposes.
{"title":"Adaptive proportional derivative decentralized output based controller for a biped robotic device","authors":"Isaac Chairez, Y. Alsmadi, Pamela Vera-Tizatl, Karla Rincón-Martínez","doi":"10.1177/14644193221125093","DOIUrl":"https://doi.org/10.1177/14644193221125093","url":null,"abstract":"This paper describes the design and implementation of a novel adaptive control method to track a set of bioinspired reference trajectories. These references define anthropomorphic movements for an exoskeleton robot. The proposed controller implemented the adjustment laws for the variable gains of a state feedback (Proportional-Derivative type) structure. The method to adjust the adaptive gains was determined using a controlled Lyapunov function. The adaptation laws use velocity estimation based on a robust exact differentiator (RED) implemented as a variation of a distributed Super-Twisting algorithm. The adaptive gain controller was evaluated on a simulated exoskeleton structure. The set of simulations considered the presence of external disturbances and modeling uncertainties. The controller proved efficient in rejecting external perturbations/uncertainties affecting the exoskeleton. The proposed controller’s performance was superior to the one obtained if the standard fixed-gain proportional derivative controller was evaluated. As an additional benefit of the adaptive PD controller implementation, a controller power reduction of at least 14 % concerning the non-adaptive version of the feedback controller was attained. An experimental evaluation of the proposed controller confirmed the benefits of the proposed controller with adaptive gains. The successful tracking of nine different biomechanically inspired reference trajectories justified the exoskeleton application, which could be used as a potential tool for rehabilitation purposes.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"1 1","pages":"554 - 569"},"PeriodicalIF":1.8,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87089913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-10DOI: 10.1177/14644193221119331
X. Wen, Linkui Huang, Zixue Du, Liang Chen, Zhen Yang
A nonlinear dynamic model of monorail vehicle and a finite element model of “running wheel-rail beam” system is established respectively, which is integrated into the Modefrontier platform. The total friction work and friction work deviation value are proposed as indicators for evaluating the wear and partial wear of the running wheels. Taking the total friction work and friction work deviation as the goals, the stability and curve passing performance of the monorail vehicle as constraints, and the structural parameters and dynamic parameters of the monorail vehicle as the optimization variables, an optimization model of partial wear of running wheel was established. The structural parameters and dynamic parameters of monorail vehicle are optimized through improved genetic algorithm. The analysis results show that the two indicators of the total friction work and friction work deviation value of the running wheels both decreased. Among them, the total friction work of the front right and rear right running wheel with severe partial wear was reduced by 20% and 21.2% respectively, the friction work deviation value was reduced by 19.30% and 27.2% respectively. The partial wear of the running wheel is improved significantly, and the purpose of reducing the partial wear of the running wheel is achieved.
{"title":"Research on parameter optimization based on multi-body dynamics model of monorail vehicle aiming at reducing running wheel wear","authors":"X. Wen, Linkui Huang, Zixue Du, Liang Chen, Zhen Yang","doi":"10.1177/14644193221119331","DOIUrl":"https://doi.org/10.1177/14644193221119331","url":null,"abstract":"A nonlinear dynamic model of monorail vehicle and a finite element model of “running wheel-rail beam” system is established respectively, which is integrated into the Modefrontier platform. The total friction work and friction work deviation value are proposed as indicators for evaluating the wear and partial wear of the running wheels. Taking the total friction work and friction work deviation as the goals, the stability and curve passing performance of the monorail vehicle as constraints, and the structural parameters and dynamic parameters of the monorail vehicle as the optimization variables, an optimization model of partial wear of running wheel was established. The structural parameters and dynamic parameters of monorail vehicle are optimized through improved genetic algorithm. The analysis results show that the two indicators of the total friction work and friction work deviation value of the running wheels both decreased. Among them, the total friction work of the front right and rear right running wheel with severe partial wear was reduced by 20% and 21.2% respectively, the friction work deviation value was reduced by 19.30% and 27.2% respectively. The partial wear of the running wheel is improved significantly, and the purpose of reducing the partial wear of the running wheel is achieved.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"27 1","pages":"588 - 601"},"PeriodicalIF":1.8,"publicationDate":"2022-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83471087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-09DOI: 10.1177/14644193221107483
Zhibin Li, S. Wang, Fei Li, Linlin Li, Linlin Liu, Haoran Zou
The vibration and noise of marine power systems mainly comes from gearbox in addition to engine, while gearbox vibration is mainly caused by internal excitation of gear transmission system (GTS) and transmitted to ship hull through the box. This paper proposes a vibration reduction method of 3D modification controlling the strength of vibration source and constrained damping structure restraining vibration transmission energy. For herringbone gear,The 3D modification form of tooth surface combining with two parabolas and one straight line is proposed and the modified tooth surface equation is derived based on the principle of forming grinding.Combined with tooth contact analysis (TCA) technology and loaded tooth contact analysis (LTCA) technology, three internal excitations of GTS after 3D modification are determined. Through force balance and node connection relationship between each element, the coupling dynamic model of gear-shaft-bearing with three internal excitations i.e., time-varying meshing stiffness, transmission error and meshing impact is established to calculate dynamic load of journal bearing.The load is loaded into the finite element model of the gearbox to obtain its vibration value and six symmetrical pressing plates are applied force to fix the foundation with adding the same constrained damping structure in the middle.The purpose of reducing gearbox vibration is realized by combining 3D modification technology with constrained damping structure.The results of numerical examples show 3D modification can effectively reduce the radial and axial vibration of the gearbox, while the constrained damping structure can availably cut down transverse vibration. Compared with modification, constrained damping structure is more obvious effect. This study will contribute to the in-depth study of vibration reduction measures of marine gearbox system under variable excitations, and analyze its vibration characteristics under different vibration reduction measures, so as to meet the requirements of its vibration reduction and realize safety and stability of ship hull.
{"title":"Influence of 3D modification on dynamic characteristics of herringbone gearbox system and vibration reduction design","authors":"Zhibin Li, S. Wang, Fei Li, Linlin Li, Linlin Liu, Haoran Zou","doi":"10.1177/14644193221107483","DOIUrl":"https://doi.org/10.1177/14644193221107483","url":null,"abstract":"The vibration and noise of marine power systems mainly comes from gearbox in addition to engine, while gearbox vibration is mainly caused by internal excitation of gear transmission system (GTS) and transmitted to ship hull through the box. This paper proposes a vibration reduction method of 3D modification controlling the strength of vibration source and constrained damping structure restraining vibration transmission energy. For herringbone gear,The 3D modification form of tooth surface combining with two parabolas and one straight line is proposed and the modified tooth surface equation is derived based on the principle of forming grinding.Combined with tooth contact analysis (TCA) technology and loaded tooth contact analysis (LTCA) technology, three internal excitations of GTS after 3D modification are determined. Through force balance and node connection relationship between each element, the coupling dynamic model of gear-shaft-bearing with three internal excitations i.e., time-varying meshing stiffness, transmission error and meshing impact is established to calculate dynamic load of journal bearing.The load is loaded into the finite element model of the gearbox to obtain its vibration value and six symmetrical pressing plates are applied force to fix the foundation with adding the same constrained damping structure in the middle.The purpose of reducing gearbox vibration is realized by combining 3D modification technology with constrained damping structure.The results of numerical examples show 3D modification can effectively reduce the radial and axial vibration of the gearbox, while the constrained damping structure can availably cut down transverse vibration. Compared with modification, constrained damping structure is more obvious effect. This study will contribute to the in-depth study of vibration reduction measures of marine gearbox system under variable excitations, and analyze its vibration characteristics under different vibration reduction measures, so as to meet the requirements of its vibration reduction and realize safety and stability of ship hull.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"34 1","pages":"602 - 622"},"PeriodicalIF":1.8,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79375675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1177/14644193221109793
X. Xie, Ming Li, Junwei Wang, Leilei Zhu
A floating raft isolation structure is adopted to reduce the vibration of the marine rotor-bearing system, however, the system on the moving hull will be affected by the ship implicate motion, and its vibration will be difficult to predict. In this study, a dynamic model of the system under heaving and rolling coupled motion is established after considering the nonlinear oil film reaction force, unbalance inertia force, restoring force of the structure and inertia force of the ship motion. A numerical method is introduced to present the responses of the system, such as the amplitude and rotating speed curve, waterfall diagrams, and the rotor orbit and its Poincaré maps, etc. Moreover, the effects of rotating speed, amplitudes and frequencies of the coupled motion on the dynamic behaviours of the system are studied. The results indicate that the unstable region of rotating speed of the system increases under the coupled motion, the vibration of the system is greatly affected by the parameters of coupled motion, and the vibration amplitudes of rotor and raft can be effectively limited due to the displacement restrictor.
{"title":"Nonlinear dynamics of the rotor system with a floating raft isolation structure under the coupled motion of ship heaving and rolling","authors":"X. Xie, Ming Li, Junwei Wang, Leilei Zhu","doi":"10.1177/14644193221109793","DOIUrl":"https://doi.org/10.1177/14644193221109793","url":null,"abstract":"A floating raft isolation structure is adopted to reduce the vibration of the marine rotor-bearing system, however, the system on the moving hull will be affected by the ship implicate motion, and its vibration will be difficult to predict. In this study, a dynamic model of the system under heaving and rolling coupled motion is established after considering the nonlinear oil film reaction force, unbalance inertia force, restoring force of the structure and inertia force of the ship motion. A numerical method is introduced to present the responses of the system, such as the amplitude and rotating speed curve, waterfall diagrams, and the rotor orbit and its Poincaré maps, etc. Moreover, the effects of rotating speed, amplitudes and frequencies of the coupled motion on the dynamic behaviours of the system are studied. The results indicate that the unstable region of rotating speed of the system increases under the coupled motion, the vibration of the system is greatly affected by the parameters of coupled motion, and the vibration amplitudes of rotor and raft can be effectively limited due to the displacement restrictor.","PeriodicalId":54565,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part K-Journal of Multi-Body Dynamics","volume":"47 1","pages":"382 - 406"},"PeriodicalIF":1.8,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79353534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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