Development and evaluation of new simple mechanisms for shock absorption of the ankle

Shiraishi, Hajime; Shiraishi, Haruhiro

doi:10.1016/j.finmec.2022.100095

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…In other words, it is desirable to install a mechanism with a damper at an intermediate position between the bar and the shoulder. Similarly, it has been found that the load on the ankle and knee joints can also be reduced by increasing the damping factor, (9,10) which suggests that the model based on shock absorbers is applicable to the human physiology.…”

Section: Reducing the Load On The Shoulder (Elastic Constant And Damp...mentioning

confidence: 90%

“…There are multiple examples of muscle utilization that combine control engineering and ergonomics. (9,10) In this study, we demonstrated the basic structure and mechanisms of the device, analyzed the dynamic properties of certain mechanisms, and developed effective mechanical elements to lift the load. We also conducted experiments to faithfully reproduce the concept of the lifting technique.…”

Section: Introductionmentioning

confidence: 99%

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Development of Load-lifting-assist Mechanism Using Lower Limbs

Shiraishi,

Sakaki

et al. 2024

Sensors and Materials

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The increasing average age of agricultural workers owing to the declining birth rate and aging population is becoming a serious problem worldwide. To harvest and transport products, it is necessary to lift, lower, and move containers when transporting them, but this work is a heavy burden not only for the elderly but also for young people. Thus, several electric assistive devices have been developed for carrying this load, including some in the field of long-term care. However, because of the complexity and high cost of the equipment, they are not widely used on private farms and in ordinary households. To solve these problems, we have developed a motorized auxiliary device for lifting and transporting goods. It has a simple structure, few failures, and low cost. Instead of conventional motors, hydraulics, or pneumatic pressure, the energy source for this device is the worker's thigh muscles, which generate the greatest force in the human body. In addition, instead of using arm muscles to support the load, the device causes the load to be supported with the shoulders. In this study, we demonstrate the basic structure and mechanism of the device, analyze the dynamic characteristics of some mechanisms, and propose effective mechanical elements for lifting the load.

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Section: Reducing the Load On The Shoulder (Elastic Constant And Damp...mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Development of Load-lifting-assist Mechanism Using Lower Limbs

Shiraishi,

Sakaki

et al. 2024

Sensors and Materials

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“…In this paper, a simple rst-order delay control system is modeled by simulating the lifting motion of an object by a martial artist. Examples of applications of the hidden power of martial arts already exist in the eld of shock absorption and other areas, but to the authors' knowledge, none are known that are limited to lifting objects [13,14]. The simpli ed object lifting method in this paper could be applied to simpli ed lifting actions of objects in agricultural work and nursing care.…”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of a Simple Load Lifting Technique Applying Japanese Ancient Martial Arts

Shiraishi

Sakaki

Shiraishi

2023

Preprint

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Conventional ergonomics utilizes second-order control systems and three-dimensional models, but their complexity makes them unsuitable for practical development. In this paper, a simple mechanism for lifting objects by temporarily setting the load to zero was devised by applying basic techniques of kobujutsu (Japanese ancient martial arts). The accuracy of this mechanism was confirmed by simulation and experiment. This mechanism reveals that the speed of reflection of signals by the brain is important to essentially increase the output of human muscles, enabling efficient and simple movements. It is suggested that the method of lifting objects revealed in this paper is not limited to martial arts and other sports fields but could be applied to a wide range of fields such as nursing care and agricultural work. The development and evaluation of the simple object lifting technique demonstrated in this paper is expected to activate and improve the motor skills of the public and have a positive impact on health maintenance activities.

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“…A below-the-knee body model of such a simple knee supporter has already been proposed in the fields of agriculture and nursing care by Shiraishi et al It was not sufficient to develop a new simplified supporter device based on this model. In addition, only a basic model was developed, and it was considered insufficient as a practical product in light of the actual human body model [6]. It was also thought that if this product could be provided safely and inexpensively, it would be useful not only in the fields of agriculture and nursing care, but also in preventing knee failures during light exercise in middle-aged and older people, etc., and could also be applied to lifelong sports, etc.…”

Section: Introductionmentioning

confidence: 99%

New Mechanical Knee Supporter Device for Shock Absorption

Shiraishi

2022

Machines

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Conventional knee supporters generally reduce knee pain by restricting joint movement. In other words, there were no mechanical knee supporters that functioned powerfully. Considering this problem, we first devised a device in which a spring is inserted into the double structure of the cylinder and piston, and a braking action is applied to the piston. This mechanism retracts when the knee angle exceeds a certain level. Next, the knee and the device were modeled, and the dynamic characteristics of the device were investigated to find effective elements for knee shock absorption. Although various skeletal and muscular structures have been studied for the knee section, we kept the configuration as simple as possible to find effective elements for the device. A shock-absorbing circuit was devised, and air was used as the working fluid to facilitate smooth knee motion except during shock. Increasing the spring constant effectively reduced the knee load.

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Development and evaluation of new simple mechanisms for shock absorption of the ankle

Cited by 4 publications

References 12 publications

Development of Load-lifting-assist Mechanism Using Lower Limbs

Development of Load-lifting-assist Mechanism Using Lower Limbs

Development and Evaluation of a Simple Load Lifting Technique Applying Japanese Ancient Martial Arts

New Mechanical Knee Supporter Device for Shock Absorption

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