著者

Yoshihiro SEJIMA Tomio WATANABE Mitsuru JINDAI

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.10, no.9, pp.JAMDSM0103, 2016 (Released:2016-11-09)

参考文献数

21

被引用文献数

2

---

In human interaction and communication, not only verbal messages but also nonverbal behavior such as nodding and paralanguage are rhythmically related and mutually synchronized among speakers. This synchrony of embodied rhythms unconsciously enhances a sense of unification and causes an interaction-activated communication in which nonverbal behaviors such as body movements and speech activity increase, and the embodied interaction is activated. In this paper, we propose the concept of an estimation model of interaction-activated communication based on the heat conduction equation with the characteristics of precipitous speed fluctuation and develop a model that estimates the degree of interaction-activated communication by using speech input only. Further, we evaluate the developed model in estimating the period of the interaction-activated communication in an avatar-mediated communication. The results demonstrate that the developed model is effective in estimating the interaction-activated communication.

著者

Toru MIYAIRI Jo SAKASHITA Takeshi SHIRASAKA Hisato SHIMOMURA Takeshi TOI

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.16, no.5, pp.JAMDSM0053, 2022 (Released:2022-10-31)

参考文献数

18

被引用文献数

1

---

During push switch operation, tactile feedback is crucial in determining whether the operation will be successful. However, to enhance the tactile feedback and ensure usability, the actuation force should not increase. Herein, a method to improve tactile feedback during switch operation by designing the operating sound is proposed. In the first experiment, to investigate the acoustic characteristics of high feedback operating sound, participants evaluated recorded commercial push switch operating sounds through headphones using the semantic differential method. Results showed that the operating sound with a short decay time and high loudness value in the high-frequency band exhibited a highly intelligible impression. Furthermore, the push switch operation exhibited two sounds (push and release), whose contribution to the impression was determined based on their loudness. In the second experiment, participants evaluated their impressions when operating push switches, which comprised various combinations of operating sound volume and actuation force. Results showed that highly intelligible sound improved the tactile feedback. Moreover, it was found that considering the balance between the operating sound volume and actuation force is necessary to improve the switch operation feedback through the operating sound. These findings can aid in enhancing the feedback of devices that require switches with low actuation force due to design constraints.

著者

Masaharu KOMORI Kippei MATSUDA Tatsuro TERAKAWA Fumi TAKEOKA Hideaki NISHIHARA Hiroo OHASHI

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.10, no.6, pp.JAMDSM0086, 2016 (Released:2016-10-24)

参考文献数

31

被引用文献数

6 26

---

A transportation vehicle or mobile robot that can move to a target location in an arbitrary direction on the floor is important to ensure that work can proceed quickly and effectively in a limited space. To move in an arbitrary direction, conventional methods such as omni wheels have free rollers along the outer circumference of the wheel that can rotate passively. However, the conventional methods are difficult to control precisely because of the rotational resistance of the free rollers. In addition, the direction that the conventional methods can move actively by themselves is limited. This paper proposes a novel mechanism called the active omni wheel, which is able to actively move in an arbitrary direction by using only one wheel unit. The active omni wheel is composed of a main body and outer rollers arranged around the outer circumference of the wheel. By using a differential gear mechanism, the active omni wheel enables active rotation of not only the main body of the wheel but also the outer rollers. The theoretical equation of motion of the active omni wheel is clarified to control the wheel. An omnidirectional vehicle using the active omni wheel is discussed. The appropriate arrangement of wheels that enables the omnidirectional vehicle to move actively in arbitrary directions by using the active omni wheel is shown and the motion theory is constructed. This paper also discusses the structure appropriate for the vehicle using the active omni wheel, including the arrangement of input shafts, the structure supporting the wheels, the main body of the vehicle, and its suspension. The active omni wheel and omnidirectional vehicle were designed and manufactured. Experiments conducted on the manufactured vehicle verify the effectiveness of the active omni wheel and the omnidirectional vehicle.

著者

Juncheng LI

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.12, no.1, pp.JAMDSM0029, 2018 (Released:2018-03-22)

参考文献数

16

被引用文献数

3 5

---

Since the two free parameters have significant effect on the shape of the T-Bézier curve, a natural idea arises to find the optimal values of the two free parameters for obtaining the fairest curves. In this paper, we use approximate curvature variation minimization to obtain the optimal values of the two free parameters. By minimizing an appropriate approximate function, the unique solution can be easily obtained. We outline some examples to illustrate the effectiveness of this method.

著者

Vitor Mitsuo FUKUSHIGUE HAMA Wei WU Mutsunori YAGIURA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.12, no.3, pp.JAMDSM0072, 2018 (Released:2018-07-20)

参考文献数

29

---

The overall planning process undertaken by a bus company is traditionally composed of five sub-processes: timetabling, vehicle scheduling, maintenance scheduling, crew scheduling, and crew rostering. Solving the full optimization problem is believed to be computationally intractable, and therefore in practice the five sub-processes are usually optimized in sequence. In this paper, we present a model that integrates the problems of vehicle scheduling and maintenance scheduling. The objective is to minimize the differences in mileage between buses, the total distance traveled, and the daily differences in the number of maintenance tasks. We propose a heuristic algorithm using the framework of greedy randomized adaptive search procedure (GRASP), and we improve the neighborhood search procedure by using an ordered list of possible trips. We compare the neighborhood search procedure with and without this mechanism and show that the ordered list reduces the number of neighbors to be checked by more than 95%, and it reduces the time to obtain solutions of the same or better quality by an average of 70%. Through computational experiments on instances generated from real-world data, we show that the proposed algorithm finds solutions that are as good as or better than those obtained by a commercial solver in less than 5% of the time required by the latter.

著者

Yuki KINOSHITA Tetsuo YAMADA Surendra M. GUPTA Aya ISHIGAKI Masato INOUE

出版者

一般社団法人 日本機械学会

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.10, no.3, pp.JAMDSM0052-JAMDSM0052, 2016 (Released:2016-07-01)

参考文献数

22

被引用文献数

8

---

For green supply chains, it is essential to disassemble and recycle end-of-life (EOL) assembled products for material circulation. In order to establish disassembly plants environmentally friendly and economical manner, a disassembly parts selection is often carried out. Each part has a different recycling rate and cost, and all parts have precedence relationships among disassembly tasks. Igarashi et al. (2014) [International Journal of Industrial Engineering and Management Systems, Vol.13, No.1, pp.52-66] proposed a disassembly parts selection method that is carried out in an environmentally friendly and economical manner with non-destructive or destructive disassembly with integer programming with ε constraint. However, calculated efforts are required to achieve optimum solutions for the ε constraint method. On the other hand, goal programming is well known as an effective way to solve multi-criteria decision-making problems. This study proposes a bi-objective disassembly parts selection with recycling rate and cost using goal programming, and analyzes multiple types of EOL assembled products and disassembly parts selection. First, an environmentally friendly and economical disassembly parts selection is addressed using a 3D-CAD and Recyclability Evaluation Method (REM) developed by Hitachi Ltd. Next, the environmentally friendly and economical disassembly parts selection is formulated with goal programming. Finally, a case study is quantitatively discussed by comparing different types of assembled products and goal programming parameters. It is demonstrated that the proposal method by goal programming in this study finds the same solutions with the lower number of numerical experiments as that with the ε constraint method.

著者

Yoshitaka NAKAO Hiroshi NAGAMOCHI

出版者

一般社団法人 日本機械学会

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.1, no.2, pp.217-226, 2007 (Released:2007-04-27)

参考文献数

12

被引用文献数

2 13

---

We consider a discrete-type split delivery vehicle routing problem, in which delivery goods for a customer consist of a set of items, each item is required to be serviced by exactly one vehicle, and each customer is allowed to be visited more than once. In this paper, we propose a fast algorithm that constructs a set of routes one by one without any improvement procedures. The algorithm generates routes by dynamic programming based on an elaborate route evaluation function that estimates the total travel cost required to service all the remaining items by vehicles. Experimental results on real-world instances are reported.

著者

Hiroaki T.-KANEKIYO Shinjiro AGATA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.13, no.1, pp.JAMDSM0008, 2019 (Released:2019-01-23)

参考文献数

19

被引用文献数

2

---

An inventory management problem is theoretically discussed for a factory having effects of lead times in replenishing the inventory, where it stocks materials used for its products. It is assumed that the factory can dynamically control the size of ordering materials. By applying the stochastic control theory, the optimal control of the ordering size is derived, in which the expected total cost up to an expiration time is minimized. First, a new stochastic model is constructed for describing an inventory fluctuation of the factory by the use of a non-diffusive stochastic differential equation, where an analytic time is introduced so that the inventory process can be a Markov process even though it is affected by lead times. Next, an optimal control is formulated by introducing an evaluation function quantifying total costs. Based upon them, the Hamilton-Jacobi-Bellman (HJB) equation is derived, whose solution gives the optimal control. Finally, the optimal control is quantitatively examined through numerical solutions of the HJB equation. Numerical results indicate that if time up to an expiration time is short then the optimal control is affected by it, otherwise, the optimal control does not depend on it.

著者

Jyun-Rong ZHUANG Hayato NAGAYOSHI Hirotoshi KONDO Keiichi MURAMATSU Keiichi WATANUKI Eiichiro TANAKA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.11, no.6, pp.JAMDSM0089, 2017 (Released:2017-12-22)

参考文献数

13

被引用文献数

3 6

---

Wearable assistive devices have been receiving considerable attention in academic circles. To make these devices efficient, we need additional research on the service lives of the mechanical elements used in these devices. The wearers of these devices frequently encounter unexpected movements that lead to motor failure in the devices. The purpose of this study is to develop an overload protection mechanism using a torque limiter, which can eliminate the overload torque delivered in the reverse direction to effectively prevent the device from breaking and ensure the safety of the user. To improve the service life of assistive walking devices, we designed a sandwich mechanism for the final gear of the servo motor. We made the material from rubber and configured it between a pair of circular plates. The surface tractive force delivered the required torque. When the surface load exceeded the maximum friction force, the circular plates slipped and protected the device. In this paper, we implement a torque limiter and prove its durability by performing experiments using two circular plate designs, one with grooves type and another without grooves type. We also use various materials to assess the applicability of the assistive walking device. The findings indicate that the with grooves type gives better torque performance; it achieves the same rated torque as the servo motor. Thus, this study recommends that with grooves type is particularly suitable for the elderly who require high assistive power. On the other hand, without grooves type is suitable for users who employ the device for extended periods because this type has an excellent service life. Our experiment proves that the torque limiter that we developed can withstand the load torque over 300 times for situations involving the loss of balance such as stumbling and slipping. Finally, we experimentally validate the improvement of walking performance by using this torque limiter.

著者

Mitsuru JINDAI Shunsuke OTA Toshiyuki YASUDA Tohru SASAKI

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.16, no.1, pp.JAMDSM0016, 2022 (Released:2022-03-01)

参考文献数

13

---

Humans establish embodied interactions, such as bows and handshakes, when they first greet one another and display a feeling of rapport. It is believed that humans construct a relationship that is emotionally acceptable to each other by the synchronization of their embodied rhythms through their embodied interactions. Hug behaviors are expected to synchronize embodied rhythms effectively as they are an embodied interaction where whole bodies are in contact with each other. In hug behaviors between humans and robots, the same efficiency is expected. Furthermore, when a human approaches a robot, the robot should generate a hug request motion to promote embodied interactions. Therefore, in this study, a hug robot system for the generation of hug behavior with approaching humans is developed. The hug robot system that employs a hug behavior request model generates request motion of a hug when a human approaches the robot. Furthermore, a switching hug control was developed by combining the proposed hug behavior request model with the hug behavior response model. In the switching hug control, when an approaching human requests a hug, the robot generates a response motion. However, if the approaching human does not request a hug, the robot will request one to the human. Then, in hug behaviors between a human and a robot, the motion characteristics of the robot that are preferred by majority of research participants are analyzed using the developed hug robot system.

著者

Shota YABUI Takenori ATSUMI Tsuyoshi INOUE

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.13, no.4, pp.JAMDSM0078, 2019 (Released:2019-11-07)

参考文献数

28

被引用文献数

1 3

---

To increase recording density, a head positioning control system of a hard disk drive (HDD) has to compensate for vibration due to mechanical resonances of the system. In this study, a novel scheme of an adaptive feedforward cancellation (AFC) is proposed to compensate for the vibration due to the mechanical resonances. Compared to a notch filter, which is commonly used to compensate for the vibration, the proposed AFC has the advantage of estimating the amplitude of the vibration from the output signal. In addition, although the proposed AFC can be implemented as a discrete system, the design parameters: frequency, damping ratio, and gain can be set directly in a digital signal processor. The proposed control system was applied to a dual-stage actuator system, which is the mainstream head positioning control system of the current HDDs. The results indicate that the proposed system could compensate for the vibration due to the mechanical resonance.

著者

Yohei HAZAMA Hitoshi IIMA Yoshiyuki KARUNO Kosuke MISHIMA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.15, no.6, pp.JAMDSM0069, 2021 (Released:2021-10-15)

参考文献数

33

被引用文献数

11

---

In recent years, efficient logistics has become indispensable, and using unmanned aerial vehicles (UAVs) or drones is promising for considerably reducing the cost and time required for parcel delivery. This paper addresses a parcel delivery scheduling problem. In this problem, a truck loaded with drones and parcels leaves a distribution center and stops at some points on a fixed route. At each point, the drones take off and deliver parcels to customers. We define this problem as finding the assignment of customers to both the drones and their takeoff points. Then, we propose a genetic algorithm (GA) for finding a near-optimal solution in a short time. In the proposed GA, a solution is represented using sets of customers assigned to the takeoff points, and a heuristic rule determines the assignment to the drones. The crossover operation enables offspring to inherit the customer sets. Experimental results show that the proposed GA can successfully find an optimal or a near-optimal solution faster than an integer programming solver for almost all instances. In addition, it significantly outperforms other GAs using a different crossover.

著者

Hideki TODA Takeshi MATSUMOTO Shin SUGIHARA

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.13, no.2, pp.JAMDSM0034, 2019 (Released:2019-05-14)

参考文献数

24

被引用文献数

4 4

---

In this paper, to mechanize a human ankle joint stretching treatment that is mainly performed by a PT (Physical Therapist), the geometrical relationships among the Ankle joint, Hip joint, Sole, and pushing device rotation center are analyzed using a simple numerical calculation model, and the effectiveness of the model was examined in an actual developed system. The stretching of the ankle joint is an important medical treatment that PTs perform to help their patients to recover their ability to walk and to prevent contracture. Because the ankle joint treatment requires a large amount of force (equal to the subject’s weight) and precise angle control at the same time, manual treatment by PTs has not been replaced by mechanical treatment systems. In a previous study, we developed a new mechanism of ankle joint stretching that involves fixing the length of the subject sitting chair and the device; the novel mechanism can realize comfortable stretching without pain. However, the optimum geometrical relationships among the Ankle joint, Hip joint, Sole, and pushing device rotation center have not been analyzed. In this paper, to develop the effective mechanism of the stretching treatment, the geometrical relationships were analyzed mathematically by using numerical calculation, and the effectiveness of the numerical calculation was confirmed by manufacturing a treatment device comprising two force sensors and two DC motors based on the calculation results. Numerical calculation results show that the PT’s key point of the ankle joint treatment was a position located between the Ankle joint and the pushing device rotation center. The analytical result will effectively promote the development of the mechanical systems used as ankle joint stretching treatment devices.

著者

Hideyoshi YANAGISAWA Chihiro MIYAZAKI

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.13, no.1, pp.JAMDSM0013, 2019 (Released:2019-02-18)

参考文献数

26

被引用文献数

3

---

The study proposes a methodology for extracting and applying expectation effect in multisensory user-product interaction to balance the design attributes that satisfy must-be and attractive qualities in the Kano model. Satisfying both qualities is assumed to be an objective of product design. This study modeled users' cognitive process of cyclic user-product interactions. Using the model, the proposed method extracts users' cognitive structure and state transitions while interacting with a product. The cognitive structure reveals the design attributes affecting must-be and attractive qualities as well as prior cue of the expectations of these qualities. Tolerance for design attributes to satisfy both qualities and the expectation effect of prior factors are discussed. The methodology is validated using a hair dryer as a case product. Another case product (camera) demonstrates how cognitive cues work as well as sensory cues as expectation effect. The proposed methodology supports designers and researchers in structuring multisensory user-product interactions as a series of state transitions of users' cognitive model. The structure helps to extract product attributes that affect both attractive and must-be perceived qualities and attributes involving expectation effect on product qualities. The method of experiment 1 can be applied to assess tolerance for product attributes to satisfy perceived qualities. The method of experiment 2 can be applied to assess the effect of prior expectation induced by both sensory and cognitive attributes, such as a product class, on perceived quality.

著者

Soichiro YOKOYAMA Hiroyuki IIZUKA Masahito YAMAMOTO

出版者

一般社団法人 日本機械学会

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.8, no.5, pp.JAMDSM0073-JAMDSM0073, 2014 (Released:2014-10-31)

参考文献数

19

被引用文献数

1

---

We propose an efficient heuristic method for job-shop scheduling problems (JSP) with the objective of total weighted tardiness minimization. The proposed method uses schedule reconstructions by priority rules to guide a local search towards promising solutions. Typically priority rules determine the whole schedule and thus in corporating it with local search procedure is difficult. In our proposed method, a priority rule decides a schedule within an arbitrary selected time window and the rest of the schedule is determined by the schedule obtained by a conventional local search method. The priority rule is given by a linear combination of simple priority rules. To improve a schedule efficiently, an appropriate set of time window and gains of the linear combined priority rule is required. Therefore, we optimize the set of time window and rule gains with genetic algorithm. This rule-based reconstruction procedure and the conventional local search procedure are alternately applied to a current solution. In the experiments, the efficiency of rule-based reconstruction procedure is verified and the proposed method is compared with one of the most effective existing methods. The results show that the proposed method outperforms the existing method on large problems with sufficient computational time. The average performance is particularly improved due to the ability of rule-based reconstruction procedure to escape from local optima of the conventional local search procedure efficiently.

著者

Qingrong FAN Kiyotaka IKEJO Kazuteru NAGAMURA Masato KAWADA Mitsuo HASHIMOTO

出版者

一般社団法人 日本機械学会

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.8, no.3, pp.JAMDSM0021-JAMDSM0021, 2014 (Released:2014-07-22)

参考文献数

23

被引用文献数

1 10

---

The operation status of gear device can directly affect the working conditions of the whole machine system. Thus, it is crucial to detect the gear damage as early as possible to prevent the system from malfunction. This paper proposes an intelligent diagnosis method for gear damage using multiple classifiers of support vector machines with extracted failure feature vector. The vibration signal of gear box is employed as the analytical data in this paper. In order to illustrate the representative characters of gear conditions, statistical parameters and characteristic amplitude ratios of frequency bands are extracted from the vibration signals in time-domain and frequency-domain respectively, which are served as failure feature vector for the following diagnosis. Moreover, to reduce the dimensions of the failure feature vector, the technology of principal component analysis is adopted to transform the original failure feature vector into a new smaller set of variables as inputs to classifiers of support vector machines. In order to classify different types of gears, multiple classifiers of support vector machines based on the binary tree are designed. The validity of this approach is investigated by the experiment. Three kinds of gears, namely normal gear, spot damaged gear and pitted gear, are tested on the power circulating type gear testing machine. The vibration accelerations of gear box are measured as original data. Most of the samples are correctly classified by the provided method, which demonstrates the effectiveness of the proposed method on the application of gear damage diagnosis.

著者

Dinh Quang TRUONG Kyoung Kwan AHN Le Duy KHOA Do Hoang THINH

出版者

The Japan Society of Mechanical Engineers

雑誌

Journal of Advanced Mechanical Design, Systems, and Manufacturing (ISSN:18813054)

巻号頁・発行日

vol.6, no.2, pp.236-251, 2012 (Released:2012-02-13)

参考文献数

14

被引用文献数

2 2

---

This paper develops a newly bicycle concept named smart bicycle (SBIC) with automatic transmission and energy recuperating ability. The SBIC operation is based on a hydrostatic transmission (HST). Several HST designs have been proposed. Moreover, a use of energy converting and storing devices is an optional design for the SBIC to recovery energy during the deceleration or going downhill process, and to support this energy to the hydraulic system during the acceleration or going uphill process. The working efficiency of the bicycle is then increased and could become competitive with the roller-chain technology. Simulations have been carried out to evaluate the working performances of the proposed SBIC concepts.