著者

北田 明夫 角 大詩 福本 智志 西崎 信 赤司 裕 守屋 登康

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.16-00501-16-00501, 2017 (Released:2017-07-25)

参考文献数

17

被引用文献数

1

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This paper presents experimental, analytical and numerical study of impact perforation of steel plates with the aim to develop the procedures to assess the perforation of steel against tornado-generated missile impact. In the experiment, flat plates of SS400 steel and SUS304 stainless steel were perforated by a square pipe with cross section 200 x 300. Projectile mass and impact velocity were kept constant, namely, approximately 1300 kg and 17 m/s. Perforation limit thickness of SS400 and SUS304 flat plate was determined to be 9 mm and 6 mm, respectively. BRL formula was used for the analytical study, and equivalent diameter of square pipe for BRL formula was defined based on the experimental data. Numerical simulations of some experiments were also carried out and the effect of thermal softening and stress triaxiality on failure strain have to be taken into account in the material model in order to reproduce the experimental results.

著者

池田 朋弘 梅谷 拓郎 甲斐 信博 大城 桂作 赤木 大地 野田 尚昭 佐野 義一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.16-00455-16-00455, 2017 (Released:2017-07-25)

参考文献数

26

被引用文献数

2

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In this study, the notch strength σBnotch was investigated for high silicon solid solution strengthened ferritic ductile cast iron in comparison with the tensile strength σBsmooth. High speed tensile tests were conducted on notched and smooth specimens at various strain rate and temperatures. The strain rate-temperature parameter (R parameter) is found to be useful for evaluating the temperature and strain rate upon the notch strength. The required range of R parameter was investigated for welded structural members in several industrial fields. The notch strength σBnotch is always larger than the tensile strength at room temperature σB,smoothRT in the range of R parameter required for the welded structures. Therefore, tensile strength σB,smoothRT is confirmed to be more useful than Charpy absorbed energy for the structural design. It is expected that the high Si ductile cast iron has wide industrial application potentiality.

著者

吉田 和司 三山 敏史 改井 瑞樹

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00564-16-00564, 2017 (Released:2017-06-25)

参考文献数

5

被引用文献数

1

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In order to clarify the reason that the multi-feeding is harder to occur in an overlap-type sheet separation mechanism than in a pressing-type, we examined the behaviors of the paper sheet in the both sheet separation mechanisms. The apparatus that handle paper sheets, such as copy machines, printers, and ATMs, are widely used in these days. These apparatus are equipped with sheet separation mechanism to make paper sheet separate one by one. The sheet separation mechanisms are classified roughly into two groups, one is a pressing-type and the other is an overlap-type. The pressing-type separation mechanism is widely used in copy machines, printers, and facsimile, because it is simple and low cost, however, its reliability is relative low because a multi-feeding is easily to occur. On the other hand, the overlap-type separation mechanism is used in apparatus that high reliability is required such as ATMs although the mechanism is complex and high cost, because a multi-feeding is hard to occur in this mechanism. However, the reason why the multi-feeding is hard to occur in the overlap-type sheet separation mechanism has not been clarified. First, we introduced the model and formulation that can calculate the resistance force and feed force acting on the paper sheets in the overlap-type mechanism. And, based on the calculation results of the resistance force and friction force between the paper sheets, we examined the behavior of the paper sheet. As a result, we found that, in the overlap-type sheet separation mechanism, when the piled paper sheets move between the feed-roller and the gate roller, a slippage caused by the resistance force that is proportional to the number of the piled sheet occurs between the piled paper sheet, and this slippage is the factor that is superior to the pressing-type sheet separation mechanism.

著者

井上 友貴 中本 圭一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00574-16-00574, 2017 (Released:2017-06-25)

参考文献数

7

被引用文献数

10

---

Manufacturing industry tends toward high-mix low-volume production in recent years. Therefore, in the field of machining, the ratio of preparation in the lead-time becomes higher because the preparation takes a great deal of time and labor to decide suitable machining method, allocate target parts, select cutting tools and generate tool paths. As a result, it is strongly required to develop a computer aided process planning (CAPP) system to shorten the preparation time and to generate NC program. Feature recognition has been considered as a key technology to develop a CAPP system, and a lot of researches have been tackling the technology for a long time. In authors' previous study, novel machining features for multi-tasking machine tools have been proposed. The machining features can correspond to several alternative machining methods. However, complex target shapes of practical mechanical parts have not been considered. In order to solve this problem, special shapes such as chamfer part and freeform surface are firstly approximated and machining features are recognized by simplifying machining primitives such as complicated groove or taper shape. The machining primitives are finally restored to original complex shapes for CAM system in this study. From the results of conducted case study, it is recognized that the proposed feature recognition method has a potential to deal with complex target shapes of practical mechanical parts.

著者

岡 昌男 上村 訓右 足立 幸志

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.17-00036-17-00036, 2017 (Released:2017-06-25)

参考文献数

13

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Necessary conditions for usage of DLC coated mechanical seals were investigated by using ring on ring type sliding tests under various contact pressures and sliding speeds in dry and wet nitrogen. The wear mode of DLC coated SiC mechanical seal can be classified into two types by surface morphology of wear surface called ModeI with smooth surface that is useful as a seal and ModeII with relatively rough surface. The transition condition from ModeI to II is given by a critical μ2PV value, and show 0.025 under dry nitrogen and 0.070 under wet nitrogen. With the increase in PV value, arithmetic average roughness Ra decreases from 0.06 μm to 0.04 μm, and it leads to reduction of friction coefficient from 1.4 to 0.4. On the other hand, structural change of DLC films was not obtained within the condition of Mode I, and the friction was high. ModeI possibly has the desirable condition to DLC films for mechanical seal use. As a conclusion, the operation within critical μ2PV value range which depends on various conditions, and in addition, reduction of the friction coefficient in this range, achieve the increase of operating condition.

著者

廣垣 俊樹 青山 栄一 山下 竜弥 岸本 昌大 河添 佑矢

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.17-00052-17-00052, 2017 (Released:2017-06-25)

参考文献数

10

被引用文献数

1

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Recently, the miniaturization and multi-functionalization of electronic equipment have been demanded due to developments in IT. Therefore, the miniaturization and densification of the semiconductor package printed wiring boards (PWBs) have been more demanded. For the realization, the miniaturization of PWBs and fabrication of highly dense electrical circuit layers are also demanded. As a result, problems such as broken drill by the increase in aspect ratio and heat damage around the drilled hole are occurred in micro-drilling process of the PWB. A step feed drilling is considered to be effective as a solution to those problems However, it needs a high-speed reciprocating movement in short stroke to keep a drilling efficiency, and then causes residual vibration on machine tool table. In the present report, we propose a novel machine tool equipped with a counter balance mechanism using a left and right lead ball screw. This mechanism consists of a balance mass that moves in the Z-axis direction corresponding to the spindle movement to cancel a vibration force in linear direction at reciprocating movement. We construct a test stand to estimate the reducing effect of vibration force and to mode it. Moreover, we confirm the improving effect in high speed micro-drilling process with a proposed machine tool.

著者

横山 眞樹 北山 哲士 高野 昌宏 合葉 修司

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.17-00067-17-00067, 2017 (Released:2017-06-25)

参考文献数

18

被引用文献数

1

---

Process parameters in plastic injection molding (PIM) such as packing pressure, melt temperature and cooling time have a direct influence on the product quality and it is important to determine the optimal process parameters for the high product quality as well as the high productivity. This paper proposes a method to determine the optimal process parameters in the PIM for high product quality and high productivity. In particular, the variable packing pressure profile that the packing pressure varies through the packing phase is adopted as the advanced PIM. Warpage and cycle time are taken as the product quality and the productivity, respectively. Therefore, a multi-objective optimization of the process parameters using the variable packing pressure profile is performed. Numerical simulation in the PIM is so intensive that a sequential approximate optimization using radial basis function is adopted. It is found through the numerical result that the proposed packing pressure profile can improve both the warpage and the cycle time. Based on the numerical result, the experiment is also carried out. It is confirmed through the numerical and experimental result that the variable packing pressure profile is an effective approach for the warpage reduction and the short cycle time.

著者

佐藤 綾美 岡本 崇 山田 崇恭 泉井 一浩 西脇 眞二

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.17-00135-17-00135, 2017 (Released:2017-06-25)

参考文献数

17

---

We construct a topology optimization method for two dimensional rarefied gas flow problems, based on level-set boundary expressions. The degree of rarefaction is expressed by the Knudsen number, which is the ratio of the mean free path and the characteristic length of the system. As the Knudsen number approaches 0 in the limit, flow behaviors can be described by Navier-Stokes equations and topology optimization methods for such flows have already been proposed. On the other hand, the governing equation for flows which have a large rarefaction is the Boltzmann equation and topology optimization methods for such flows have not been seen. This paper presents the topology optimization method for rarefied gas flows whose Knudsen number is approximately 1, aiming at an application for the design of flow channels in micromachines. We use the Bhatnagar-Gross-Krook (BGK) model of the Boltzmann equation and extend it to the entire design domain that includes both rarefied gas and solid domains. First, we briefly discuss the Boltzmann equation and the level set-based topology optimization method. Second, an optimization problem is formulated to address the design of flow channels that aim to maximize the flow velocity induced along a temperature gradient. Finally, several numerical examples demonstrate the validity and usefulness of the proposed method.

著者

中山 尚也 中内 靖

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00383-16-00383, 2017 (Released:2017-06-25)

参考文献数

10

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When visually impaired persons use general traffic facilities, they may face a lot of difficulties. Particularly, the accidents on the station platform may result serious injuries. One of the solutions is to install a platform door, which opens only when a train is at the station. However, the cost for the installation is very expensive. Also, if a different railroad companies use the same station, it usually cannot be installed. In this paper, we propose a safe walk support system at the station platform by sensor embedded intelligent white cane. Two functions will be realized by the intelligent white cane. It tells the direction of the platform even though a person lost a direction. It also senses a color on the ground and tells the position of the train door. We conducted experiments with subjects and confirmed the efficiency of the proposed system.

著者

土井 幸輝 開発 勇喜 豊田 航 西村 崇宏 藤本 浩志

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00470-16-00470, 2017 (Released:2017-06-25)

参考文献数

18

被引用文献数

1

---

Tactile characters aid in providing information to visually impaired persons. The Japanese Standards Association enacted basic design methods for embossed tactile patterns in March 2011. However, data on the appropriate size of tactile alphabets are not necessarily enough available. The purpose of this study was to evaluate the influence of the size of a tactile alphabet on identification and to investigate the perceptible size for people without rich tactile experiences. The participants of this study were 15 young people and 15 old people who were unfamiliar with tactile characters intended for visually impaired people. They were asked to discriminate tactile alphabets of six different sizes by using their forefingers without the aid of eyesight. The results showed that the younger and older participants were able to discriminate the presented stimuli faster and more accurately as the stimulus size was increased. Concretely, when the size was 28 mm, each participants regardless of young or older groups could identify the tactile character accurately and quickly. In addition, a trend was seen in that the older group needed larger tactile alphabet sizes than the younger group. We determined the relationship between the tactile alphabet size and discrimination ability of younger and older people without rich tactile experiences.

著者

大塚 宏一 平木 克裕 日垣 秀彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00562-16-00562, 2017 (Released:2017-06-25)

参考文献数

14

---

The purpose of this study was to investigate the temperature behavior of sliding portions in the wear test of artificial joint materials using a hip joint simulator. We measured the concentrations of total protein in the lubricating liquids to determine whether they had an influence on the temperature of the fluids. Fluorescence microscopy was used to examine the relationship between the temperature of the sliding portions and the adsorbed state of the proteins. The results showed that the temperature of the sliding portions increased to more than 41°C during the running-in period, and it remained constant between 40 to 41°C after this period. However, it was necessary to exchange the lubricating liquids at regular time intervals to maintain the temperature of the sliding portions during prolonged wear tests. The exchange of lubricating liquids helped to maintain the concentration of total protein in lubricating liquids; however, the aggregate of the proteins increased at a temperature more than 40°C at the sliding surfaces. Consequently, it was considered that the adsorption of agglomerated proteins caused by the increased temperature of the sliding portions might influence the wear mechanism of artificial joints.

著者

道辻 洋平 志賀 亮介 須田 義大 林 世彬 牧島 信吾

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00068-17-00068, 2017 (Released:2017-07-25)

参考文献数

17

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It is important for railway bogies to get compatibility between curving performance and running stability. Utilizing independently rotating wheels may be an effective solution. The EEF bogie proposed by Dr.Frederich in late 1980th shows good curving performance making use of the gravity restoring force generated by the tread gradient of independently rotating wheels. However, the bogie gives rise to a kind of hunting motion as the vehicle running velocity increases. In this paper, an effective modification of the EEF bogie which solves the hunting motion is mentioned. The solution is to incline both wheel-axles while adjusting the tread shape of each wheel. In this paper, the EEF bogie with inclined wheel-axles is firstly proposed and analytically evaluated by the MBD simulation. Since the newly proposed bogie has complicated structures, a precise modeling of the bogie is mentioned in detail. From the result of eigenvalue analysis, proposed bogie can dramatically improve the hunting stability as compared to the conventional EEF bogie. In addition, the proposed bogie has excellent curving performance in tight curve section equivalent to the conventional EEF bogie. As those results, it is possible to achieve both high speed hunting stability and curving performance utilizing the proposed bogie unit in the vehicle.

著者

石井 麻美 藤田 聡

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.16-00532-16-00532, 2017 (Released:2017-07-25)

参考文献数

5

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The escalator is one of most important vertical transportation measures to connect each every one of storey-layers in buildings. During severe earthquakes, escalators are not only shaken by themselves, but withstand lateral relative deflexions induced in the structures or buildings installing them. Therefore, escalators are usually installed in the buildings with one side of them in fixed connection and the other side in free condition or utilized both sides in the non-fixed style in order to mitigate undesirable excessive deflexions induced in the truss-like structures of escalators. However, in the 2011 Pacific Ocean Tohoku-Oki Earthquake, fall accidents of four escalators occurred in the three locations. Escalator truss might come off from the beam of the building, because excessive lateral deformations were induced in the storey-layers with more than assumption where the accidents happened. During these accidents, it was also considered that a non-fixed part might collide with the beam of building by larger deflexions than expected occurred in the sliding parts; this collision might cause excessive compressive force and residual displacement in the escalator truss might be caused (Miyata et al.). Projects for the building standard development promotion program have been conducted by Japanese ministry of land, infrastructure and transport (MILIT) in order to improve and maintain the building standard by applying non-government organizations such as research institutes, private enterprises and universities. In these projects, investigations regarding elevators and escalators have been implemented since 2010. Especially in 2014, the loading tests were carried out to clarify the behaviour in such excessive condition using eight full size escalator-truss model at the Chiba NT campus testing cite of Tokyo Denki University. The results obtained in the tests have already been applied to the building standards law revision and the notice amendment (Tokyo Denki University and MILIT). From the above-mentioned background, the object of this research is to construct an analytical model to clarify the seismic response behaviour using the non-linear restoring force characteristics of the escalator truss model. In this first step of the study, an analytical model using a single degree of freedom model considering not only the non-linear behaviour of escalator truss but also the sliding friction occurring between the beams of buildings and escalators has been developed.

著者

山崎 展博 北川 敏樹 宇田 東樹 栗田 健 若林 雄介 西浦 敬信

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00146-17-00146, 2017 (Released:2017-07-25)

参考文献数

16

被引用文献数

3

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A method has been developed for predicting the aerodynamic noise from the bogie of a high-speed train using a two-dimensional microphone array in a low-noise wind tunnel. First, the mean velocity distribution of flow was simulated precisely in the low-noise wind tunnel. Next, aerodynamic noise generated by the bogie, hereinafter referred to as aerodynamic bogie noise, was estimated from the noise source distribution measured with the two-dimensional microphone array. Finally, based on the experimental results, the predicted noise generated from the lower part of the car (i.e. the total of the aerodynamic noise estimated through the proposed method and the rolling and machinery noise estimated in a previous study) was compared with the measurement data obtained near the track in the field test. It was found that the predicted sound pressure level showed good agreement with those measured in the field test. This suggests that the proposed method is appropriate to estimate the aerodynamic bogie noise quantitatively. It was also shown that the contribution of the aerodynamic bogie noise to the total noise generated from the lower part of the car is greater than that of rolling and machinery noise, especially below 500 Hz.

著者

岸本 侑斗 池田 佑樹 鈴木 新

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00175-17-00175, 2017 (Released:2017-07-25)

参考文献数

13

被引用文献数

1

---

In this paper, we propose a system to identify the intention of motion based on the change of the surface shape of the upper arm. The proposed system uses six photoreflectors to measure the change of the surface shape of the forearm close to elbow joint. The changes of the surface shape of the forearm close to elbow joint are caused by muscle contraction. For this reason, the proposed system aims to be mounted on prosthetic hands for upper limb amputees who have residual muscular. Conventional identification methods of the intention of motion using photoreflectors were performed with a single motion such as grasping / releasing. In contrast, the proposed system identifies the six types of composite motions of hand and forearm. Complex processing is required to identify the six types of composite motions at a time. In the proposed system, it is possible to identify the composite motion by relatively simple multiple regression model, by separating into the motion of the forearm and the hand. In order to confirm the effectiveness of the proposed system, we conducted a discrimination experiment of composite motion by six volunteers and a discrimination experiment of composite motion at long-time use by one volunteer. As a result of the experiment by six volunteers, the average discrimination rate was 94.9 %. Moreover, the average discrimination rate of long-time use was 97.8 %. From these experimental results, we showed the possibility of discrimination of composite motion using photoreflectors.

著者

坂口 歳斗 土井 幸輝 藤本 浩志

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00059-17-00059, 2017 (Released:2017-07-25)

参考文献数

23

被引用文献数

1

---

Hardness identification is one of the most important tactile senses in humans. People use their hands in various ways to identify the hardness of an object. For example, acupuncturists identify stiffness in a muscle by pressing down with their forefinger held flat over the affected area. However, experimental evidence for the role of the pressing method in the identification of an object's hardness even when the same finger is used has not been shown yet. In this fundamental study, we investigated the differential threshold of hardness for different finger postures of pressing (pressing down with one's forefinger held “flat” or “vertically”) to determine the relationship between the different finger postures of pressing and hardness identification. We used seven elastic test pieces, each with a different Young's modulus, as the presented stimuli. We conducted an experiment using the constant method to calculate the differential threshold of hardness as a measure of hardness identification. The results showed that the differential threshold of hardness was higher when pressing down with a forefinger held “flat” than when pressing down “vertically” with the same force. This finding will be useful in evaluating the tactile identification of hardness in acupuncturists.

著者

河田 俊 安田 和弘 岩田 浩康

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.16-00515-16-00515, 2017 (Released:2017-07-25)

参考文献数

16

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Acquiring one's own form is an important technique for excelling in any competitive sport. Most basketball players spend a significant amount of time in acquiring the ideal form in order to improve their basketball skills. Although basketball is one of the most popular sports in the world, there are only few devices that aid in improving a player's skills. In the research involving the development of a skill-support device for basketball, it is important to learn the ideal form to acquire a physical posture of set-form. Therefore, we developed a device for reforming the set-form using auditory biofeedback. The proposed device measures the shoulder angle of a player in real time (50 Hz) and generates a sound on the basis of the measured angle to inform the ideal posture. If the set-form posture is not ideal, the device uses this sound to inform the player that they must modify their posture. The player then changes their shoulder angle and if the posture becomes ideal, the device mutes the sound. Several seconds after the sound stops, the device indicates the player to shoot. According to our study for testing the efficacy of this device, the BF-training group obtained 20% higher success rate than the control group. Moreover, the BF-training group had a more stable form than the control one.

著者

村松 吉晃 下田 昌利

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00158-17-00158, 2017 (Released:2017-07-25)

参考文献数

18

被引用文献数

3

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In this study, we propose a parameter-free optimization method of material orientation for a shell structure consisting of orthotropic materials. We consider the compliance as an objective function and minimize it under the state equation constraint. The material orientation distribution is the design variables to be determined. This optimum design problem is formulated as a distributed-parameter optimization problem, and the sensitivity function with respect to the orientation variation is theoretically derived based on the variational method. The optimum orientation variations are determined by the H1 gradient method with the Poisson's equation, where the sensitivity function is applied as the internal heat generation on the shell surface, a driving force to vary the orientation in order to reduce the objective function while maintaining the smooth material orientation distribution. The optimum and continuously distributed orientation variations are determined as the temperature distribution of this fictitious heat transfer analysis without design parameterization. The optimum design examples show that the optimum the material orientation for the minimum compliance can be effectively obtained with the proposed optimization method.

著者

山田 雄基 柿沼 康弘

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00098-17-00098, 2017 (Released:2017-07-25)

参考文献数

14

被引用文献数

1

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Error factors in sensorless cutting force estimation under ball-screw-driven stage were discussed. In addition, their influence on estimation accuracy was experimentally evaluated through several end milling tests. Because rigid body-based formulation is difficult in ball-screw-driven stage, estimation principle of cutting force needs to be formulated considering interaction between rotation and translation to enhance estimation accuracy of the cutting force. Simulation results revealed that phase lag element between current and position/angle response was non-negligible in higher frequencies as well as measurement error of acceleration due to numerical differential. Therefore, both phase lag compensation and high-resolution encoders are necessary. Fluctuations of disturbance force and acceleration synchronizing rotation of servomotor were classified in terms of their period: comparatively low-frequency fluctuations ranging from submillimeter to millimeter resulting from mechanical elements; high-frequency fluctuations with period of several micrometers resulting from interpolation error of encoder signal. The former can be eliminated more effectively than the latter, because preliminary identification is possible based on position dependency and repeatability. On the other hand, the latter needs to be eliminated by signal processing, because preliminary identification including phase is difficult. The result of milling tests revealed that it was possible to enhance estimation accuracy of the cutting force by constructing estimation system considering the above error factors.

著者

柴田 知世 山田 周歩 山田 哲男 井上 全人

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00082-17-00082, 2017 (Released:2017-07-25)

参考文献数

16

被引用文献数

1

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To make sustainable society come true, product design is required to consider environmental issues such as reduction of resource usage, product disposal, and environmental loads. Many approaches for resolving these issues such as reuse, remanufacturing, and upgradable designs are studied and implemented. To apply these design approaches to product appropriately, a designer has to understand their characteristics and evaluate the product's adaptability for these design options. Hence, this paper evaluates the advantage of these design approaches. The ultimate purpose of this study is proposal of an adaptability evaluation method of product reusability, remanufacturability, and upgradability to support designer's decision making of product or component life cycle options at the early phase of design process. Thus, this paper speculates the appropriate perspectives of these evaluations and proposes conceptual evaluation method based on the viewpoints of society (low environmental load emission), manufacturer (low production cost and high profit), and consumer (low life cycle cost and high performance). Proposed evaluation method evaluates laptop's adaptabilities of aforementioned life cycle options quantitatively and shows that upgrading can satisfy the intents of environmental load emission, production cost, and life cycle cost. In addition, the agendas of this study are emerged. Particularly, evaluation perspectives with respect to product disassemblability, reliability, and pleasurability should be added. Additionally, improving evaluation method that can evaluate multiple perspectives comprehensively is also this study's agenda.