根据初始弯曲柔性梁的3R伪刚体模型,构建了含有初始弯曲柔性梁的四杆机构的仿真模型,并在ADAMS软件中进行建模仿真,输出伪刚体模型的末端轨迹和末端转角,并和ANSYS软件中建立的刚柔耦合模型输出结果以及基于1R伪刚体模型建立的机构仿真...根据初始弯曲柔性梁的3R伪刚体模型,构建了含有初始弯曲柔性梁的四杆机构的仿真模型,并在ADAMS软件中进行建模仿真,输出伪刚体模型的末端轨迹和末端转角,并和ANSYS软件中建立的刚柔耦合模型输出结果以及基于1R伪刚体模型建立的机构仿真模型输出结果进行对比,可以对3R伪刚体模型进行验证是否可行、优越,为更广泛应用初始弯曲柔性梁打下了坚实的基础。Based on the 3R pseudo-rigid body model of an initially curved flexible beam, the article constructed a simulation model of a four-bar mechanism that incorporates the initially curved flexible beam. The modeling and simulation were conducted using ADAMS software, and the end trajectory and end angle of the pseudo-rigid body model were output. These results were then compared with the output from the rigid-flexible coupling model established in ANSYS software and the output from the mechanism simulation model based on the 1R pseudo-rigid body model. This comparison facilitates the verification of the feasibility and advantages of the 3R pseudo-rigid body model, thereby laying a solid foundation for the broader application of initially curved flexible beam.展开更多
The flexible pipe bend can not only reduce the structural vibration and fluid noise in pipeline, but also realize the flexible connection of a horizontal line and a vertical line and compensate the displacement of thr...The flexible pipe bend can not only reduce the structural vibration and fluid noise in pipeline, but also realize the flexible connection of a horizontal line and a vertical line and compensate the displacement of three dimensions produced by the shock or vibration of pipeline in the special situations. Up to now, little attention has been paid to study the flexible pipe bend applied in the pipeline of medium or high pressure, because no appropriate framework materials can be used to reinforce it which must endure the burst pressure higher than 10 MPa. The investigation shows that it is possible to produce the flexible pipe bend of medium or high pressure if such fibers with high performance as Kevlar fibers are used to be its reinforced materials. However, its structural designing theory, manufacturing technology and measuring techniques aren't yet perfect and systematic, which leads to the instability of the performance of products. Furthermore, few references about its research can be seen. Therefore, it is necessary to systematically and thoroughly develop the structural designing theory, manufacture technology and measuring techniques of flexible pipe bend.展开更多
A multi-point flexible straightening process characterized by reciprocating bending is proposed.Specifically,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical...A multi-point flexible straightening process characterized by reciprocating bending is proposed.Specifically,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical experiments of the straightening of a series of metal profiles with different materials and initial shapes.Further,the relationship between the bending radius and the times of reciprocating bending required to unify the curvature is discussed,and the distribution of residual stress after straightening is analyzed.The results show that the reciprocating bending process can eliminate the difference of the initial curvature,make the curvature of each section tend to be uniform;the times of reciprocating bending to reach the uniform curvature decreases with the decrease of bending radius.The straightness of the straightened profile obtained from the experiment and simulation is less than 0.2%,demonstrating a good feasibility of this method.展开更多
The high flexibility of profile bending with hyperelastic pad enables it to be a promising method for small lot or single part production, especially for space frame and roof-rail parts in automotive and aerospace ind...The high flexibility of profile bending with hyperelastic pad enables it to be a promising method for small lot or single part production, especially for space frame and roof-rail parts in automotive and aerospace industries. Bending of two aluminum profiles with different sections was carried out to investigate the effect of main process parameters on the bending process. Results show that the shape of the cross-section and its relative thickness and section modulus in bending are the main factors that determine the bending properties of the profiles. Roller stroke, properties of polyurethane pad and constraints on profiles are key factors that determine the bending radius and section deformation of bent profiles. Failures and quality problems met in experiments were also analyzed.展开更多
文摘根据初始弯曲柔性梁的3R伪刚体模型,构建了含有初始弯曲柔性梁的四杆机构的仿真模型,并在ADAMS软件中进行建模仿真,输出伪刚体模型的末端轨迹和末端转角,并和ANSYS软件中建立的刚柔耦合模型输出结果以及基于1R伪刚体模型建立的机构仿真模型输出结果进行对比,可以对3R伪刚体模型进行验证是否可行、优越,为更广泛应用初始弯曲柔性梁打下了坚实的基础。Based on the 3R pseudo-rigid body model of an initially curved flexible beam, the article constructed a simulation model of a four-bar mechanism that incorporates the initially curved flexible beam. The modeling and simulation were conducted using ADAMS software, and the end trajectory and end angle of the pseudo-rigid body model were output. These results were then compared with the output from the rigid-flexible coupling model established in ANSYS software and the output from the mechanism simulation model based on the 1R pseudo-rigid body model. This comparison facilitates the verification of the feasibility and advantages of the 3R pseudo-rigid body model, thereby laying a solid foundation for the broader application of initially curved flexible beam.
文摘The flexible pipe bend can not only reduce the structural vibration and fluid noise in pipeline, but also realize the flexible connection of a horizontal line and a vertical line and compensate the displacement of three dimensions produced by the shock or vibration of pipeline in the special situations. Up to now, little attention has been paid to study the flexible pipe bend applied in the pipeline of medium or high pressure, because no appropriate framework materials can be used to reinforce it which must endure the burst pressure higher than 10 MPa. The investigation shows that it is possible to produce the flexible pipe bend of medium or high pressure if such fibers with high performance as Kevlar fibers are used to be its reinforced materials. However, its structural designing theory, manufacturing technology and measuring techniques aren't yet perfect and systematic, which leads to the instability of the performance of products. Furthermore, few references about its research can be seen. Therefore, it is necessary to systematically and thoroughly develop the structural designing theory, manufacture technology and measuring techniques of flexible pipe bend.
基金financially supported by the National Natural Science Foundation of China(No.52005431)the National Natural Science Foundation of Hebei Province,China(No.E2020203086)the National Major Science and Technology Project of China(No.2018ZX04007002).
文摘A multi-point flexible straightening process characterized by reciprocating bending is proposed.Specifically,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical experiments of the straightening of a series of metal profiles with different materials and initial shapes.Further,the relationship between the bending radius and the times of reciprocating bending required to unify the curvature is discussed,and the distribution of residual stress after straightening is analyzed.The results show that the reciprocating bending process can eliminate the difference of the initial curvature,make the curvature of each section tend to be uniform;the times of reciprocating bending to reach the uniform curvature decreases with the decrease of bending radius.The straightness of the straightened profile obtained from the experiment and simulation is less than 0.2%,demonstrating a good feasibility of this method.
文摘The high flexibility of profile bending with hyperelastic pad enables it to be a promising method for small lot or single part production, especially for space frame and roof-rail parts in automotive and aerospace industries. Bending of two aluminum profiles with different sections was carried out to investigate the effect of main process parameters on the bending process. Results show that the shape of the cross-section and its relative thickness and section modulus in bending are the main factors that determine the bending properties of the profiles. Roller stroke, properties of polyurethane pad and constraints on profiles are key factors that determine the bending radius and section deformation of bent profiles. Failures and quality problems met in experiments were also analyzed.
