A complete mathematical model for logarithmic spiral type sprag one-way clutch design and analysis is given.It assumes that the motion of all clutch components can be expressed by a model of epicyclic gearing.It takes...A complete mathematical model for logarithmic spiral type sprag one-way clutch design and analysis is given.It assumes that the motion of all clutch components can be expressed by a model of epicyclic gearing.It takes advantage of Hunt-Crossley contact impact theory to calculate the contact forces between sprags and races,and it can be used for optimization of design and comparison with other types of sprag clutches.A good deal of analysis shows that the parameters of the steady windup angle,the steady contact force,the natural frequency and natural cycle of clutch have nothing to do with the initial velocity of outer race,while the parameters of the maximum transient windup angle,the maximum transient impact force and the steady engagement time increase linearly in the mode of engaging operation of clutch.It is also shown that the strut angle has great influence on the dynamic engagement performance of clutch.The parameters of the steady windup angle,the maximum transient windup angle,the steady engaging time,the steady contact force,the maximum transient impact force and the natural cycle of clutch decrease linearly nearly with the inner strut angle,while the natural frequency of the system increases linearly with the inner strut angle.展开更多
In this paper,I established a single crawler model with a dynamic contact force considered.I modeled each crawler track using dynamic contact model.By modeling each crawler track,I hope to be able to analyze trafficab...In this paper,I established a single crawler model with a dynamic contact force considered.I modeled each crawler track using dynamic contact model.By modeling each crawler track,I hope to be able to analyze trafficability of a crawler type vehicle in various road surfaces.First,I think that I established a single crawler model.I modeled a single crawler using Hunt-Crossley model and Coulomb model that handle a nonlinear contact force model.And also,I built a prototype single crawler for comparing the experimental examination with the simulation examination.In advance,the running over limit of the prototype single crawler was analyzed geometrically,and I bore out that it could run over to 163 mm.Therefore,I conducted the experiment examination with step height of 160 mm and 165 mm and obtained trajectory data that were allowed to run over and were not allowed to run over.From the result of both the experimental examination and the simulation examination,I bore out the validity of our single crawler model.I described about our single crawler model,the simulation examination and the experimental examination in this paper.展开更多
基金Project(2011CB706800)supported by the National Basic Research Program of China
文摘A complete mathematical model for logarithmic spiral type sprag one-way clutch design and analysis is given.It assumes that the motion of all clutch components can be expressed by a model of epicyclic gearing.It takes advantage of Hunt-Crossley contact impact theory to calculate the contact forces between sprags and races,and it can be used for optimization of design and comparison with other types of sprag clutches.A good deal of analysis shows that the parameters of the steady windup angle,the steady contact force,the natural frequency and natural cycle of clutch have nothing to do with the initial velocity of outer race,while the parameters of the maximum transient windup angle,the maximum transient impact force and the steady engagement time increase linearly in the mode of engaging operation of clutch.It is also shown that the strut angle has great influence on the dynamic engagement performance of clutch.The parameters of the steady windup angle,the maximum transient windup angle,the steady engaging time,the steady contact force,the maximum transient impact force and the natural cycle of clutch decrease linearly nearly with the inner strut angle,while the natural frequency of the system increases linearly with the inner strut angle.
文摘In this paper,I established a single crawler model with a dynamic contact force considered.I modeled each crawler track using dynamic contact model.By modeling each crawler track,I hope to be able to analyze trafficability of a crawler type vehicle in various road surfaces.First,I think that I established a single crawler model.I modeled a single crawler using Hunt-Crossley model and Coulomb model that handle a nonlinear contact force model.And also,I built a prototype single crawler for comparing the experimental examination with the simulation examination.In advance,the running over limit of the prototype single crawler was analyzed geometrically,and I bore out that it could run over to 163 mm.Therefore,I conducted the experiment examination with step height of 160 mm and 165 mm and obtained trajectory data that were allowed to run over and were not allowed to run over.From the result of both the experimental examination and the simulation examination,I bore out the validity of our single crawler model.I described about our single crawler model,the simulation examination and the experimental examination in this paper.
