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Computer Modeling in Engineering & Sciences 2018年第2期114卷 191-207页

作者： Kaito Watanabe Masaki Izawa Ayumi Takahashi Kazuhito Misaji College of Industrial Technology Nihon University

Under the aim of finding effective rehabilitation solutions,the difference between the extents of fatigue of each muscle used in different motions are compared.Previous research suggested methods for estimating muscle torque and muscle tension on the basis of a musculoskeletal model.As a result,it has become possible to quantitatively identify the extent of fatigue in each muscle during motion.Therefore,to evaluate muscle fatigue more quantitatively,driving power and angular momentum are focused on.Based on the driving torque of joints and the muscle torque calculated by using a three-dimensional musculoskeletal model,a method for calculating the driving power of joints and the angular momentum of a muscle is proposed.This method is applied to analysis of different motions.Moreover,fatigue of muscles is quantitatively analyzed on the basis of driving power and angular momentum.

关键词： Angular momentum driving power driving torque musculoskeletal model

Quantification of Ride Comfort Using Musculoskeletal Mathematical Model Considering Vehicle Behavior

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2287-2306页

作者： Junya Tanehashi Szuchi Chang Takahiro Hirosei Masaki Izawa Aman Goyal Ayumi Takahashi Kazuhito Misaji Graduate Student Graduate School of Industrial TechnologyNihon UniversityChiba275-8575Japan Hitachi Astemo Ltd.Tochigi321-3325Japan Former Graduate Student Graduate School of Industrial TechnologyNihon UniversityChiba275-8575Japan College of Industrial Technology Nihon UniversityChiba275-8575Japan

This research aims to quantify driver ride comfort due to changes in damper characteristics between comfort mode and sport mode,considering the vehicle’s inertial behavior.The comfort of riding in an automobile has been evaluated in recent years on the basis of a subjective sensory evaluation given by the driver.However,reflecting driving sensations in design work to improve ride comfort is abstract in nature and difficult to express theoretically.Therefore,we evaluated the human body’s effects while driving scientifically by quantifying the driver’s behavior while operating the steering wheel and the behavior of the automobile while in motion using physical quantities.To this end,we collected driver and vehicle data using amotion capture system and vehicle CAN and IMU sensors.We also constructed a three-dimensional musculoskeletal mathematical model to simulate driver movements and calculate the power and amount of energy per unit of time used for driving the joints and muscles of the human body.Here,we used comfort mode and sport mode to compare damper characteristics in terms of hardness.In comfort mode,damper characteristics are soft and steering stability is mild,but vibration from the road is not easily transmitted to the driver making for a lighter load on the driver.In sport mode,on the other hand,damper characteristics are hard and steering stability is comparatively better.Still,vibration from the road is easily transmitted to the driver,whichmakes it easy for a load to be placed on the driver.As a result of this comparison,it was found that a load was most likely to be applied to the driver’s neck.This result in relation to the neck joint can therefore be treated as an objective measure for quantifying ride comfort.

关键词： Human engineering biomechanics driver’s sense of fatigue double lane change musculoskeletal mathematical model

Quantifying Roll Feel of a Car by Using a Musculoskeletal Mathematical Model

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Computer Modeling in Engineering & Sciences 2019年第3期118卷 493-507页

作者： Masaki Izawa Ryota Araki Tatsuro Suzuki Kaito Watanabe Kazuhito Misaji Showa Corporation 112-1 Haga-daiHaga-machHaga-gunTochigiJapan Ex-Graduate Student Nihon UniversityCollege of Industrial TechnologyDepartment of Mathematical Information EngineeringJapan Nihon University College of Industrial TechnologyDepartment of Mathematical Information EngineeringJapan

Primary purpose of this research is to create a three-dimensional musculoskeletal mathematical model of a driver of a car using a motion capture system.The model is then used in an analysis of drive torque around joints and attached muscles as a vehicle travels in different travel modes and damping force settings to examine‘burdens’for the driver.Previous studies proposed a method of quantifying the degree of musculoskeletal load in simple human motion from the changes in drive torque around joints and attached muscles.However,examination of the level of burdens for the driver while driving using this method does not seem to exist.Especially within the scope of evaluating different travel modes and dampers,there is no other study.Results of this study are hence a valuable new perspective on quantitative analysis of the burdens for the driver’s joints and muscles depending on the different settings of travel modes and dampers.

关键词： Human engineering biomechanics musculoskeletal mathematical model driving torque motion capture

Vibration Analysis of Vehicle Floor Panel Using Hybrid Method of FEM and SEA

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Journal of Mechanics Engineering and Automation 2014年第4期4卷 305-310页

作者： Kazuhito Misaji Yusuke Suzuki Ayumi Takahashi Fumihiko Ide Theophane Courtois Department of lndustrial Technology Nihon University Chiba 275-8575 Japan Honda R&D Americas Inc. Raymond 43067 America autoneum Winterthur 43 8406 Switzerland

In order to improve the mass efficiency of an automotive soundproof package, it is important to predict the middle to high frequency range of noise and vibration during vehicle operation. A hybrid method of experimental and analytical SEA (statistical energy analysis) has been applied for the prediction of air-borne noise. However, for predicting structure-borne noise, there are no definitive simulation methods that can address the soundproof specifications in an actual vehicle. Thus, in this paper, a FEM (finite element method) · SEA hybrid method is used. The FEM · SEA hybrid method predicts structure-borne noise in the middle to high frequency range. First, we explain the basic concept of the FEM · SEA hybrid method; Second, we describe our experiment to verify the analytical results of the FEM · SEA hybrid method; Third, we provide the details of the FEM model versus the FEM · SEA hybrid model; Finally, we verify the validity and availability of the FEM · SEA hybrid method through comparisons of the FEM analysis results, FEM · SEA analysis results and measured results.

关键词：混合方法振动分析 SEA 有限元法车辆结构噪声面板地板