Abstract:In recent years, bioinspired lightweight design has become a high priority in technology. An important source is the musculoskeletal system, which achieves a light construction by the interplay of different effects, which have the aim of minimizing bending stresses. In this paper the potentials for technology and the challenges for a transfer are discussed using kinematic chains as an example. An iterative approach is presented, which represents a solution to integrate the simultaneous optimization process of … Show more
“…So far, tension chording is investigated for structures loaded with one-dimensional bending. In prior studies, technical lightweight design potentials of tension chording for this load case were shown (Bartz et al, 2018a;Bartz et al, 2018b;Bartz et al, 2019). Possible areas of application for tension chording are presented in a prior study (Uttich et al, 2019), but systems in the identified application scenarios are subject to more loads but bending, e.g.…”
Tension chording is a lightweight design principle in the human motion system. More muscles than necessary are available in this system to generate motion. By using these redundant muscles the principle contributes to the lightweight design of the motion segments. The lightweight design benefits of the principle for technical structures loaded with bending torques were shown in prior studies. This paper presents a pilot study on lightweight design benefits of using tension chording for torsion loaded structures.
“…So far, tension chording is investigated for structures loaded with one-dimensional bending. In prior studies, technical lightweight design potentials of tension chording for this load case were shown (Bartz et al, 2018a;Bartz et al, 2018b;Bartz et al, 2019). Possible areas of application for tension chording are presented in a prior study (Uttich et al, 2019), but systems in the identified application scenarios are subject to more loads but bending, e.g.…”
Tension chording is a lightweight design principle in the human motion system. More muscles than necessary are available in this system to generate motion. By using these redundant muscles the principle contributes to the lightweight design of the motion segments. The lightweight design benefits of the principle for technical structures loaded with bending torques were shown in prior studies. This paper presents a pilot study on lightweight design benefits of using tension chording for torsion loaded structures.
“…The human musculoskeletal system contains several subsystems with interdepending lightweight design solutions [8]. One part of the system is the human arm.…”
Section: Tension Chording Principlementioning
confidence: 99%
“…In other publications, the tension chording principle is described as a principle to reduce bending in structures by using redundant muscle and tendon forces [8,5]. We introduce a refined definition in this paper.…”
The tension chording principle is a biomimetic lightweight design principle for kinematic chains. A great number of conceivable actuation concepts exist for specific applications that use the tension chording principle. Their effect on the system weight cannot yet be evaluated without calculating structural stress and movement. When comparing the effects on system weight of different actuation concepts, modelling the concepts can be timeconsuming. We present an approach that uses a modeling system combining multibody and finite element simulation. Thus, stress and movement are calculated in the same model. We successfully test the approach for a simple system.
“…Figure 9.Flow chart of the design calculation: Classical approach (left) with extensions of the bioinspired approach (right) (adjusted according to Bartz et al. 2018 a ; Bartz et al. 2018 b and Bartz 2019).…”
Section: Practical Studies By Application On An Articulated Arm Robotmentioning
An important source for technical lightweight design is the human musculoskeletal system. The musculoskeletal lightweight design mainly results from the coordinated interplay of different principles. Prevailing solutions that use musculoskeletal lightweight design principles neglect the coordinated interplay of these principles. Moreover, transfer is limited to isolated principles. Therefore, further potential for lightweight design can be expected. Due to the kinematic similarities of the human extremities to technical systems that can be described as open kinematic chains, in this paper the lightweight design potential is examined by applying the interaction of the aforementioned lightweight design principles to technical systems. A new bioinspired approach is developed, which implements the control and optimization running synchronously in nature in a sequential approach for technology. The bioinspired approach is implemented by coupling multibody simulation and topology optimization in an iterative process. The results of the bioinspired approach show that, compared to a classical approach, mass can be saved and deformations can be minimized. The synthesized geometry is mainly optimized for compressive stresses and therefore easier to manufacture than a bending stiff structure in the classical case. The examinations in this paper do not take application-specific requirements into account. Therefore the application to special technical systems, and furthermore advantages and disadvantages of the new approach are discussed.
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