Journal of Biomechanical Science and Engineering最新文献

{"title":"Generation of gait data less prone to stumbling considering the physical differences among trainees","authors":"Y. Osawa, K. Watanuki, K. Kaede, Keiichi Muramatsu","doi":"10.1299/JBSE.20-00478","DOIUrl":"https://doi.org/10.1299/JBSE.20-00478","url":null,"abstract":"","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66269962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of muscle activity in tongue motion during swallowing through medical image data","authors":"H. Azegami, Shinjiro Ono, Kenzen Takeuchi, Takahiro Kikuchi, Y. Michiwaki, Keigo Hanyu, T. Kamiya","doi":"10.1299/jbse.21-00254","DOIUrl":"https://doi.org/10.1299/jbse.21-00254","url":null,"abstract":"","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66271274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A six-degree-of-freedom proportional-derivative control strategy for bumblebee flight stabilization","authors":"Xuefei Cai, Hao Liu","doi":"10.1299/JBSE.21-00113","DOIUrl":"https://doi.org/10.1299/JBSE.21-00113","url":null,"abstract":"Flying insects perform active flight control with flapping wings by continuously adjusting their wing kinematics in stabilizing the body posture to stay aloft under complex natural environment. While the Proportional Derivative (PD) / Proportional Integral Derivative (PID)-based algorithms have been applied to examine specific single degree of freedom (DoF) and/or 3 DoF flight control associated with insect flights, a full 6 DoF flight control strategy remains yet poorly studied. Here we propose a novel 6 DoF PD controller specified for flight stabilization in flapping flights, in which proportional and derivative gains are optimized to facilitate a fast while precise flight control by combing Laplace transformation and root locus method. The vertical position, yaw, pitch and roll are directly stabilized by tuning the wing kinematics while the forward/backward position and lateral position are indirectly stabilized by controlling the pitch and roll, respectively. Coupled with a recently developed flight dynamic model informed by high-fidelity CFD simulation (Cai et al. 2021), this methodology is proven to be effective as a versatile and efficient tool to achieve fast flight stabilization under both small and large perturbations for bumblebee hovering. The 6 DoF PD flight control strategy proposed may provide a useful bioinspired flight-controller design for flapping-wing micro air vehicles (FWMAVs).","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66270999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pressures monitored by 3D printed capacitive pressure sensor embedded on prosthetic upper-limb socket; a case study","authors":"SunKon Lee, H. Kwon, Sung-yoon Jung, Hyun-Jun Shin, C. Kwon, Joo-Hyung Kim","doi":"10.1299/jbse.21-00077","DOIUrl":"https://doi.org/10.1299/jbse.21-00077","url":null,"abstract":"","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66271081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring a bumblebee-inspired power-optimal flapping-wing design for hovering on Mars based on a surrogate model","authors":"Tianyang Xiao, Hao Liu","doi":"10.1299/jbse.20-00001","DOIUrl":"https://doi.org/10.1299/jbse.20-00001","url":null,"abstract":"While rovers are of importance for Mars exploration in terms of various surveillance, surface rovers may encounter great challenges due to rough terrain and complex turbulent environment on Mars partly because aerial vehicles have difficulties to stay airborne due to the extremely low atmospheric density. Flights of surface rovers on Mars share the aerodynamic similarity with insect flights on earth in terms of low Reynolds number flow regime. Motivated by that insects can achieve remarkable flapping-wing aerodynamic performance in force production, flight stability and maneuverability under highly unsteady environments, we here proposed a bumblebee-inspired flapping-wing design for Mars surface rovers. We developed a power-efficient aerodynamic model by combining a surrogate model and a bioinspired dynamic flight simulator for hovering flight in a parametric space comprising wing shape and wing kinematics to explore feasible design points and some optimal solution with the power output minimized. Our results indicate that an enlarged wing model inspired by bumblebees is capable of sustaining hovering flight on Mars with a set of aspect ratios and wing kinematics and an optimal design point is found to correspond with a power output of 0.0509W, which may provide a novel and feasible biomimetic design for flapping-wing aerial vehicles on Mars.","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"15 1","pages":"20-00001-20-00001"},"PeriodicalIF":0.0,"publicationDate":"2020-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1299/jbse.20-00001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49636010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing simulation of deficient limb’s strokes in freestyle for swimmers with unilateral transradial deficiency","authors":"M. Nakashima, R. Takahashi, T. Kishimoto","doi":"10.1299/jbse.19-00467","DOIUrl":"https://doi.org/10.1299/jbse.19-00467","url":null,"abstract":"The present study focused on freestyle swimming by swimmers with unilateral transradial deficiency. It has not been clarified yet whether the deficient limb should move so as to match the tempo of the intact upper limb, or if it should move as fast as possible to produce thrust by itself. The objective of this study was to solve the theoretically ideal deficient limb’s strokes in freestyle for a swimmer with unilateral transradial deficiency by using the optimizing simulation. The method of the optimizing simulation of arm strokes considering muscle strength characteristics was developed in a previous study. This method was utilized to solve the deficient limbs’ strokes in the present study. Actual swimming by a participant was reproduced by simulation first. Since the resultant swimming speed of the simulation was in the range of the experimental speed, the validity of the simulation was confirmed. Next, optimizing simulations were conducted for the case of maximum shoulder joint torque multiplied by 1.0, 0.85 and 0.72. From these results, a significant increase in the swimming speed was found for the optimized cases. It was also suggested that the contribution by the deficient limb to propulsion can be increased by up to 15% of the intact limb. The optimized stroke was found to have a later timing and faster motion than the original stroke. This motion was realized by the principle that more joint torque can be exhibited in adduction than in flexion when the joint angular velocity was high.","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1299/jbse.19-00467","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of biomechanical loads for three-dimensional soaking postures in bathwater","authors":"M. Nakashima, Satoshi Fukuda, Takanao Fujii, Rie Suzuki, M. Azuma, R. Nakamura","doi":"10.1299/jbse.20-00062","DOIUrl":"https://doi.org/10.1299/jbse.20-00062","url":null,"abstract":"Comfort is required for soaking in bathwater. Although several studies investigated comfort during soaking from a biomechanical viewpoint, these previous studies employed two-dimensional models in the sagittal plane of a bather. The objectives of this study were to take three-dimensional postures of the bather into account and to evaluate the biomechanical loads for three-dimensional soaking postures. A three-dimensional biomechanical model was constructed, and an experiment to measure the soaking postures and reaction forces from the bathtub was conducted for eight participants. In addition, a supplementary experiment to measure the passive elastic joint torques was conducted for the same participants as well. Using the experimental results, the joint torques during soaking were calculated. In addition, the biomechanical load during soaking was defined as the sum of weighted joint torques, and the weighting coefficients were determined so that the tendencies of the biomechanical load were consistent with those of sensory evaluation of comfort. Finally, the biomechanical loads were calculated for various bathtub conditions and evaluated. It was found that the contributions of joint torques at the hip and neck to the comfort were dominant. It was also found that hip joint torques not only in the flexion/extension direction but also in the abduction/adduction direction were affected by the difference in bathtub length. It was suggested that the biomechanical load in the convex foot wall was smaller than those in the flat and concave ones for male bathers.","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"15 1","pages":"20-00062-20-00062"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66268737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of dynamic knee joint alignment using a one-way frontal video method","authors":"Kensaku Kawakami, Takahiko Nakamura, Katsumi Hama, Koichi Kobayashi, M. Sakamoto","doi":"10.1299/jbse.19-00616","DOIUrl":"https://doi.org/10.1299/jbse.19-00616","url":null,"abstract":"In clinical practice, motion analysis can be challenging due to lack of space. Therefore, we propose a method of using one-way frontal video that can be executed easily in a small area. As it has been suggested that gait analysis using one-way frontal video can be used to analyze dynamic changes to knee joint alignment, the purpose of this research was to evaluate this method of motion analysis and examine the accuracy of this technique compared with that of a 3D motion analysis system. Twelve healthy subjects wearing optical reflective markers participated in this gait analysis study that involved the simultaneous use of one-way frontal video and a 3D motion analysis system. The femoral tibial angle (FTA) and the distance between the lower limb mechanical axis and the center of the knee joint were analyzed. The mean absolute error (MAE) of the results from the one-way frontal video and the 3D motion analysis system was calculated and the accuracy of the one-way frontal video method was evaluated. As a result, the patterns of change in knee alignment index obtained from the one-way frontal video all qualitatively matched those observed using the 3D motion analysis system. The MAE was 0.8 degrees in the FTA and the distance between the lower limb mechanical axis and the center of the knee joint was 2.5 mm. The MAE of knee joint alignment was sufficiently small compared to the alignment change associated with abnormal motion in patients with osteoarthritis. Therefore, the evaluation of knee joint alignment using the one-way frontal video method offers sufficient levels of accuracy to be used in diagnoses of abnormal movement.","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66266394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating cognitive function in elderly people using information from outdoor walking","authors":"A. Suzuki, Kenichi Takahashi, Yasuaki Ohtaki, Kenji Kamijo, Tadatoshi Inoue, M. Noto, Takashi Nakamura","doi":"10.1299/jbse.19-00491","DOIUrl":"https://doi.org/10.1299/jbse.19-00491","url":null,"abstract":"The rapid increase in the aging population of Japan is becoming a serious social concern, and the number of elderly individuals with dementia is also increasing. The Ministry of Health, Labour and Welfare of Japan has reported that the elderly account for 4.62 million individuals, of which approximately 4 million have mild cognitive impairment (MCI). However, monofunctional disorders, such as those in individuals with MCI, can be treated, with patients recovering 44% of their abilities 2 years after treatment, thereby suggesting that early detection and treatment of dementia is important. It has been reported that individuals who walk slowly or have experienced a significant decline in walking speed with age have a higher risk of developing dementia. In this study, to study movement in individuals aged ≥ 60 years, we focused on walking, a basic activity of daily living. We proposed and evaluated novel methods to estimate cognitive function. Acceleration and angular velocity sensors were attached to the waists of 20 elderly participants who were asked to walk outdoors ordinarily for 5– 10 min, during which acceleration and angular velocity were measured. The similarity, standard deviation, and period of the stride were determined from the acceleration waveform and angular velocity waveform during walking. These were used as independent variables, and multiple regression analysis was performed using the Mini-Mental State Examination (MMSE) score as a dependent variable. An MMSE score estimation equation was constructed. The relationship between the estimation formula and the actual test value was R2 = 0.773 (P <0.01), which was good. As a result of cross-validation, the root mean square (RMS) error is low and the error is neither fixed nor proportional. Using the body acceleration and angular velocity information when walking outdoors, we built a very accurate formula for estimating the MMSE score.","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"15 1","pages":"19-00491-19-00491"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1299/jbse.19-00491","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66265785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complex viscosity of dilute capsule suspensions: a numerical study","authors":"D. Matsunaga, Y. Imai","doi":"10.1299/jbse.20-00102","DOIUrl":"https://doi.org/10.1299/jbse.20-00102","url":null,"abstract":"In this paper, we apply an oscillating shear flow to a dilute capsule suspension and report its viscoelastic properties. We analyze the complex viscosity under different capillary numbers and viscosity ratios, which is a viscosity contrast inside and outside the capsules. For all viscosity ratios, the real part of complex viscosity η ′ monotonically decreases with the frequency of the applied oscillating shear, while the imaginary part η ′′ shows the maximum value at an intermediate frequency. In general, the capsule with a larger viscosity ratio gives larger η ′ , while that of smaller viscosity ratio gives larger η ′′ . At high frequencies, the capsule that has higher (lower) inner viscosity contributes to increase (decrease) the viscosity of the solutions. In order to separately discuss the contributions of the membrane elasticity and internal fluid viscosity, we analyse the first term and second term of the particle stress tensor. The first term, which is called elastic stress in this paper, represents particle stress that arises from the capsule deformation. The amplitude of elastic stress is nearly constant at low frequencies, while it is inversely proportional to the applied frequency at high frequencies. The phase of elastic stress shifts from the shear to strain phases when the frequency increases. These tendencies of elastic stress do not depend on the viscosity ratio, and the qualitative trends are the same for all viscosity ratios. The second term, which is called viscous stress in this paper, represents particle stress that arises from the viscosity ratio, and the trend is drastically different by the viscosity ratio. The viscous stress contributes to increase (decrease) the viscosity and decrease (increase) the elasticity, when the capsule inner viscosity is higher (lower). Finally, we evaluate the effect of the capillary number. At low frequencies, both the capillary number and viscosity ratio are important factors for the rheology. On the other hand, the viscosity ratio becomes the only governing factor at high frequencies because the membrane elasticity has a negligible effect.","PeriodicalId":39034,"journal":{"name":"Journal of Biomechanical Science and Engineering","volume":"242 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66269430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}