Backpack with a nonlinear suspension system designed for low walking speeds

Harandi, Mohammad Hadi Fasihi; Loghmani, Ali; Attarilar, Salar

doi:10.1007/s00419-023-02391-7

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Li et al employed a singledegree-of-freedom model to quantitatively assess the effect of the stiffness and damping of SUSBs on the body's energy cost [34]. Harandi et al designed a nonlinear stiffness system with low dynamic stiffness and high static stiffness [38]. This mechanism included one horizontal and two oblique springs.…”

Section: Literature Surveymentioning

confidence: 99%

Suspended-Load Backpacks to Reduce the Cost of Carrying Loads with Energy Scavenging Potential—Part 1: Pre-Compression Design

Zhang,

Guo,

et al. 2023

Nanoenergy Advances

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Backpack transportation is commonly used in daily life. Reducing the cost of the backpack on the human body is a widely researched subject. Suspended-load backpacks (SUSBs) based on forced vibration can effectively reduce the cost during movement. The intrinsic frequency of the SUSB is determined by the elastic components of the SUSB. Previous researchers used pulleys and rubber ropes as the elastic components. We propose a pre-compression design strategy based on pre-compression springs. Compared with previous studies, the use of pre-compression springs as elastic elements improves the reliability of the SUSB structure, avoids the inconvenience of nonlinearity and material aging, and adds the ability to flexibly adjust the sliding distance of the backpack. Moreover, previous studies utilized the relative motion between the carrying part and the backpack part to scavenge the vibration energy. We propose that the vibration energy can also be scavenged by the relative motion between the elastic components. A theoretical model is developed for the pre-compression SUSB. We experimentally confirm the performance of the pre-compression SUSB. This work provides new design ideas for SUSBs with reduced energy costs. In Part 2, we propose a bio-inspired pre-rotation design that has the advantage of occupying less space.

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Section: Literature Surveymentioning

confidence: 99%

Suspended-Load Backpacks to Reduce the Cost of Carrying Loads with Energy Scavenging Potential—Part 1: Pre-Compression Design

Zhang,

Guo,

et al. 2023

Nanoenergy Advances

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show abstract

“…Hoover et al stated that for a given load and walking frequency, the smaller the natural frequency of the SUSB, the better the suspension effect [22]. Harandi et al designed a nonlinear stiffness system for the SUSB with low dynamic stiffness and high static stiffness [37]. They performed theoretical and software analysis of the nonlinear stiffness system and did not fabricate a prototype of the SUSB.…”

Section: Introductionmentioning

confidence: 99%

Suspended-Load Backpacks to Reduce the Cost of Carrying Loads with Energy Scavenging Potential—Part 2: Bio-Inspired Pre-Rotation Design

Zhang,

Guo,

et al. 2023

Nanoenergy Advances

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Backpack transportation is everywhere in daily life. Suspended-load backpacks (SUSBs) based on forced vibration have attracted lots of attention because of their ability to effectively reduce the cost on the body during motion. The smaller the natural frequency of SUSBs, the better the cost reduction. The natural frequency is determined by the elastic components of SUSBs. It is currently common to use rubber ropes and pulleys as elastic components. In the first part of this paper, we propose a pre-compression design for SUSBs, which has a simple structure and breaks through the limitation of rubber material. To make the natural frequency small enough, rubber ropes and compression springs require sufficient space. This leads to the current SUSBs being large and, therefore, not suitable for children to carry. Inspired by biology, here we propose a new design strategy of pre-rotation with pre-rotation spiral springs as elastic components. The pre-rotation design not only has the advantages of avoiding the inconvenience of material aging and the ability to adjust the downward sliding distance of the backpack but also greatly saves the space occupied by the elastic components, which can be adopted by small SUSBs. We have developed a theoretical model of the pre-rotation SUSBs and experimentally confirmed the performance of the pre-rotation SUSBs. This work provides a unique design approach for small SUSBs and small suspended-load devices. And the relative motion between the components inside the SUSB has a huge potential to be used by triboelectric nanogenerators for energy scavenging.

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Non-anthropomorphic passive load-bearing lower-limb exoskeleton with a reconfigurable mechanism based on mechanical intelligence

Zhan,

Zhang,

Hou

et al. 2024

Mechanism and Machine Theory

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Backpack with a nonlinear suspension system designed for low walking speeds

Cited by 3 publications

References 20 publications

Suspended-Load Backpacks to Reduce the Cost of Carrying Loads with Energy Scavenging Potential—Part 1: Pre-Compression Design

Suspended-Load Backpacks to Reduce the Cost of Carrying Loads with Energy Scavenging Potential—Part 1: Pre-Compression Design

Suspended-Load Backpacks to Reduce the Cost of Carrying Loads with Energy Scavenging Potential—Part 2: Bio-Inspired Pre-Rotation Design

Non-anthropomorphic passive load-bearing lower-limb exoskeleton with a reconfigurable mechanism based on mechanical intelligence

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