Axially variable-length solid element of absolute nodal coordinate formulation

Sun, Jialiang; Tian, Qiang; Hu, Haiyan; Pedersen, Niels Leergaard

doi:10.1007/s10409-018-0823-7

Cited by 26 publications

(3 citation statements)

References 30 publications

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“…Muscle fascicles were discretized by the flexible muscle element based on arbitrary Lagrangian–Eulerian (ALE) description [ 43 – 44 ], which can simultaneously consider the distributed muscular mass, active muscle force, and dynamic muscle wrapping. Here, the sliding joint constraint was utilized to determine the muscle wrapping path [ 45 ], ensuring the continuity of muscle material at its via points.…”

Section: Methodsmentioning

confidence: 99%

Muscle Strength Identification Based on Isokinetic Testing and Spine Musculoskeletal Modeling

Xiao,

Li,

Wang

et al. 2024

Cyborg Bionic Syst

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Subject-specific spinal musculoskeletal modeling can help understand the spinal loading mechanism during human locomotion. However, existing literature lacks methods to identify the maximum isometric strength of individual spinal muscles. In this study, a muscle strength identification method combining isokinetic testing and musculoskeletal simulations was proposed, and the influence of muscle synergy and intra-abdominal pressure (IAP) on identified spinal muscle strength was further discussed. A multibody dynamic model of the spinal musculoskeletal system was established and controlled by a feedback controller. Muscle strength parameters were adjusted based on the measured isokinetic moments, and muscle synergy vectors and the IAP piston model were further introduced. The results of five healthy subjects showed that the proposed method successfully identified the subject-specific spinal flexor/extensor strength. Considering the synergistic activations of antagonist muscles improved the correlation between the simulated and measured spinal moments, and the introduction of IAP slightly increased the identified spinal extensor strength. The established method is beneficial for understanding spinal loading distributions for athletes and patients with sarcopenia.

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Section: Methodsmentioning

confidence: 99%

Muscle Strength Identification Based on Isokinetic Testing and Spine Musculoskeletal Modeling

Xiao,

Li,

Wang

et al. 2024

Cyborg Bionic Syst

Self Cite

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“…A 1 is the rotation transformation matrix from the ox′y′ dynamic coordinate system to the inertial coordinate system oxy, 10 can be expressed as where r 0 is the position vector of the O-point before deformation, r 1 is the position vector of the O-point after deformation, r f is the vector of the deformation vector and all of them are the dynamic coordinate system, θ1 is the vector rotation angle.…”

Section: Establishment Of Dynamic Modelmentioning

confidence: 99%

Research on balanced self-weight of horizontal link heavy duty servo cylinder

Zhao

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this article, the horizontal hinged heavy duty servo cylinder is taken as the research object. In the actual working process, while the servo hydraulic cylinder outputs the curve force, the cylinder body will also rotate with the hinge point to a certain extent. Because the position of the center of gravity is constantly changing, and the weight of the cylinder body is too large, the friction causes damage to the sealing structure and seriously affects the working efficiency of the equipment. In order to improve the sealing performance of the servo hydraulic cylinder, a corresponding study is carried out. Firstly, the working angle interval of servo cylinder is optimized to ensure that the friction is the least in this range. Based on this, a new supporting structure is proposed, in which a small hydraulic cylinder is installed at the bottom of the servo hydraulic cylinder body. By controlling the output force of the small hydraulic cylinder, the cylinder body and piston rod are aligned all the time. The servo cylinder body is flexibly processed to more realistically see the adverse effect of the friction, and the co-simulation method using MSC.ADAMS and MATLAB/Simulink verifies the new support structure to improve the sealing performance. According to the simulation results and experiment results, and combined with the deformation curve of the hydraulic cylinder, when the maximum displacement is 336 mm, the maximum rotation angle is 15.6°, the friction is the smallest, about 5801.9 N. It is known from the experiment results that after adding the new support structure, the frictional force is reduced to 1365.9 N, which reduces the friction of nearly 76.5%.

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“…40 Hyldahl et al extended the arbitrary Lagrange-Euler description method into the two-dimensional problem and obtained a new type of thin plate element. 41 Furthermore, Sun et al 42,43 gave the elastic force Jacobian matrix of the thin-plate element based on Arbitrary Lagrange Euler Absolute Nodal Coordinate Formulation (ALE-ANCF) description and used ALE-ANCF thin plate element for topology optimization of flexible multibody. In this investigation, the ALE-ANCF method is employed for modeling the variable topology sling of a tower crane.…”

Section: Introductionmentioning

confidence: 99%

Multibody system dynamic analysis and payload swing control of tower crane

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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A new payload swing control method considering the vibration of tower crane is proposed in this study. The coupling between the structural vibration and the payload swing is neglected in existing studies on tower crane swing suppression. Changes of sling length are considered as disturbances. They cause the existing methods of swing suppression method ineffectual in the actual working situation. In contrast, the structural vibration of the tower crane is taken into account in this study. At the same time, the sling length is regarded as a control variable to reduce the payload swing. A new swing suppression algorithm is proposed in conjunction with phase plane analysis method. In addition, a systematical tower crane multibody system dynamic analysis platform with changing of sling length is established to verify the effectiveness of the algorithm. The traditional finite element method is used to model the tower body and boom of tower crane while the Arbitrary Lagrange Euler Absolute Nodal Coordinate Formulation (ALE-ANCF) cable element is applied for modeling the sling. This two parts are connected with sliding joint obtaining the tower crane multibody system model. Numerical examples show that the proposed method can reduce the swing amplitude the payload effectively when considering the coupling between the structural vibration and the payload swing.

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Axially variable-length solid element of absolute nodal coordinate formulation

Cited by 26 publications

References 30 publications

Muscle Strength Identification Based on Isokinetic Testing and Spine Musculoskeletal Modeling

Muscle Strength Identification Based on Isokinetic Testing and Spine Musculoskeletal Modeling

Research on balanced self-weight of horizontal link heavy duty servo cylinder

Multibody system dynamic analysis and payload swing control of tower crane

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