H. Ikeda, Y. Akagami, M. Uneda, O. Ohnishi, S. Kurokawa, T. Doi
This paper deals with the investigation conducted on the mechanism of the polishing technology, to which AC electric field is applied. For the analysis of the slurry dynamical behaviors, we used a digital image processor. In this research, we have also worked to develop a novel high-efficiency polishing technology applying AC electric field for the glass substrates for IT devices. When AC electric field was applied to, the slurry behavior was found to have better stability than the one without AC electric field. Furthermore, good polishing rates were obtained under high-relative rotation speed between the glass substrates and polishing pad. This suggests that the friction heat generated between the glass substrate and polishing pad, which promote tribochemical reactions, improves polishing rate. This latest polishing technology makes the removal rate two times better than the conventional polishing and produces excellently smooth surface.
{"title":"Development of an AC Electric Field-Applied Tribochemical Polishing Technology to Promote High-Efficiency Polishing for Glass Substrates (Image Analysis of Dynamical Slurry Behaviours and Polishing Characteristics under AC Electric Field)","authors":"H. Ikeda, Y. Akagami, M. Uneda, O. Ohnishi, S. Kurokawa, T. Doi","doi":"10.1299/KIKAIC.78.986","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.986","url":null,"abstract":"This paper deals with the investigation conducted on the mechanism of the polishing technology, to which AC electric field is applied. For the analysis of the slurry dynamical behaviors, we used a digital image processor. In this research, we have also worked to develop a novel high-efficiency polishing technology applying AC electric field for the glass substrates for IT devices. When AC electric field was applied to, the slurry behavior was found to have better stability than the one without AC electric field. Furthermore, good polishing rates were obtained under high-relative rotation speed between the glass substrates and polishing pad. This suggests that the friction heat generated between the glass substrate and polishing pad, which promote tribochemical reactions, improves polishing rate. This latest polishing technology makes the removal rate two times better than the conventional polishing and produces excellently smooth surface.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132986426","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}
The paper deals with the problem of automatic cleaning of glass windows. A small-sized glass cleaning robot has been proposed by authors. The robot is composed of two units sandwiching the glass by magnetic force. To improve the functional performance of the robot and increase the cleaning reliability, a sensor detecting the level of the glass dirt is introduced. The sensor is composed of light emitting and receiving sections. It detects the dirt by measuring the amount of reflected light which increases in dirty parts and decreases in clean parts of the glass. A signal processing scheme for this sensor is presented, and a motion control method incorporating the dirt sensor measurements is constructed. The validity of the control method and the feasibility of reliable cleaning are tested under experiments.
{"title":"Reliable glass cleaning motion of a wall climbing robot using a dirt detect sensor","authors":"Y. Katsuki, T. Ikeda, Motoji Yamamoto","doi":"10.1299/KIKAIC.78.557","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.557","url":null,"abstract":"The paper deals with the problem of automatic cleaning of glass windows. A small-sized glass cleaning robot has been proposed by authors. The robot is composed of two units sandwiching the glass by magnetic force. To improve the functional performance of the robot and increase the cleaning reliability, a sensor detecting the level of the glass dirt is introduced. The sensor is composed of light emitting and receiving sections. It detects the dirt by measuring the amount of reflected light which increases in dirty parts and decreases in clean parts of the glass. A signal processing scheme for this sensor is presented, and a motion control method incorporating the dirt sensor measurements is constructed. The validity of the control method and the feasibility of reliable cleaning are tested under experiments.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"4996 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133633660","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}
The present paper describes a systematic and comprehensive evaluation method of product development process based on the product definition at the early stage of product development in order to reduce the development time in large-scale and complicated product development with technology risk. The proposed evaluation method focused on the redesign and retrial of product components due to complicated relationship among components as the development risk leading to development delay. This proposed method evaluated the quantitative development risk using the product worth flow analysis which calculates the strength of interaction between components from the view point of engineering interaction and importance of customer worth and supported to decide the product development process and development strategy of each component. The paper shows two case studies in 2 types of micromachining system (lithography technology and cutting technology) developments. This proposed method contributes to the reduction of the feedback relationship across the product modules by technological alliance between the manufacturing process development in manufacturing firm and development of main components of manufacturing tool in comparison to the conventional manufacturing firm-led development process.
{"title":"Evaluation method of product development process with technology risk using product worth flow analysis","authors":"T. Miwa, H. Aoyama","doi":"10.1299/KIKAIC.78.312","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.312","url":null,"abstract":"The present paper describes a systematic and comprehensive evaluation method of product development process based on the product definition at the early stage of product development in order to reduce the development time in large-scale and complicated product development with technology risk. The proposed evaluation method focused on the redesign and retrial of product components due to complicated relationship among components as the development risk leading to development delay. This proposed method evaluated the quantitative development risk using the product worth flow analysis which calculates the strength of interaction between components from the view point of engineering interaction and importance of customer worth and supported to decide the product development process and development strategy of each component. The paper shows two case studies in 2 types of micromachining system (lithography technology and cutting technology) developments. This proposed method contributes to the reduction of the feedback relationship across the product modules by technological alliance between the manufacturing process development in manufacturing firm and development of main components of manufacturing tool in comparison to the conventional manufacturing firm-led development process.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130094661","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}
In the present paper, WCA (Wants Chain Analysis) is proposed by extending CVCA (Customer Value Chain Analysis). CVCA is a method for visualizing relationship among stakeholders for analyzing existing social systems and designing new social systems. WCA is a method for visualizing wants and needs of stakeholders in CVCA utilizing Maslow's hierarchy of needs. In WCA it is shown that people's wants or needs are finally realized through the looped and linear chain of relationship among stakeholders. With various examples, effectiveness of WCA is shown by describing that characteristics of business/social systems structure can be clearly visualized using WCA. It is described that WCA is useful for analyzing social systems. “Think of others” should be more and more important for humans' satisfaction and happiness in the near future. WCA can be a tool for clarifying what is for others.
{"title":"欲求連鎖分析(人々の欲求の多様性を考慮した社会システムの分析・設計手法)","authors":"牧野 由梨恵, 成功 白坂, 泰才 牧野, 隆司 前野","doi":"10.1299/KIKAIC.78.214","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.214","url":null,"abstract":"In the present paper, WCA (Wants Chain Analysis) is proposed by extending CVCA (Customer Value Chain Analysis). CVCA is a method for visualizing relationship among stakeholders for analyzing existing social systems and designing new social systems. WCA is a method for visualizing wants and needs of stakeholders in CVCA utilizing Maslow's hierarchy of needs. In WCA it is shown that people's wants or needs are finally realized through the looped and linear chain of relationship among stakeholders. With various examples, effectiveness of WCA is shown by describing that characteristics of business/social systems structure can be clearly visualized using WCA. It is described that WCA is useful for analyzing social systems. “Think of others” should be more and more important for humans' satisfaction and happiness in the near future. WCA can be a tool for clarifying what is for others.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120939058","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}
Kenichi Seki, H. Nishimura, Shaopeng Zhu, L. Balmelli
This paper describes the utilization of the product model by SysML as a joint platform for distributed design. We introduce a typical design process involving distributed design teams. In particular, this process allows a thermal design of cavities, i.e., air space inside the enclosure, in terms of flow rate, acoustic radiation resistance and so on. Then, we investigate a module-based design optimization approach defining cavity as a module to efficiently support such processes. Authors propose structural and functional modeling that enables all the distributed design sites to share the design information with the product model. Using this design framework, it will be possible to prevent performance defects due to physical coupling between modules, and thus, reduce the iteration of work.
{"title":"民生機器開発における機能・構造モデルを用いた分散協調設計（SysML製品モデルとDSMを利用したモジュール設計プロセスの計画）","authors":"Kenichi Seki, H. Nishimura, Shaopeng Zhu, L. Balmelli","doi":"10.1299/KIKAIC.78.187","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.187","url":null,"abstract":"This paper describes the utilization of the product model by SysML as a joint platform for distributed design. We introduce a typical design process involving distributed design teams. In particular, this process allows a thermal design of cavities, i.e., air space inside the enclosure, in terms of flow rate, acoustic radiation resistance and so on. Then, we investigate a module-based design optimization approach defining cavity as a module to efficiently support such processes. Authors propose structural and functional modeling that enables all the distributed design sites to share the design information with the product model. Using this design framework, it will be possible to prevent performance defects due to physical coupling between modules, and thus, reduce the iteration of work.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"122 36","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131878613","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}
A ball bearing is grouped under radial bearing and it rotates with supporting radial load. When a radial force is loaded to a ball bearing, the spring constant of the rotating ball bearing will change periodically assuming that the force is static and fixed, because the stiffness of the bearing depends on the positions of rolling elements. Thus, it can be expected that the radial vibration increases. However, there are few reports on the rotational accuracy in case that a radial force is loaded to a ball bearing. Therefore, in this research, a measuring device for rotational accuracy was developed and the influence of radial load to a ball bearing was analyzed experimentally. Axial and radial forces can be loaded at the same time in the developed measuring device. Consequently, it was verified that the increment of vibration got fewer for smaller variation in radial stiffness of the ball bearing although the radial vibration increased with radial load. In addition, this phenomenon corresponded with the tendency proposed in a previous report by the authors for the number of rolling elements to get high rotational accuracy.
{"title":"Influence of radial load on non repetitive run-out of the single ball bearing","authors":"S. Noguchi, Jun Ohda, T. Nogi","doi":"10.1299/KIKAIC.78.953","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.953","url":null,"abstract":"A ball bearing is grouped under radial bearing and it rotates with supporting radial load. When a radial force is loaded to a ball bearing, the spring constant of the rotating ball bearing will change periodically assuming that the force is static and fixed, because the stiffness of the bearing depends on the positions of rolling elements. Thus, it can be expected that the radial vibration increases. However, there are few reports on the rotational accuracy in case that a radial force is loaded to a ball bearing. Therefore, in this research, a measuring device for rotational accuracy was developed and the influence of radial load to a ball bearing was analyzed experimentally. Axial and radial forces can be loaded at the same time in the developed measuring device. Consequently, it was verified that the increment of vibration got fewer for smaller variation in radial stiffness of the ball bearing although the radial vibration increased with radial load. In addition, this phenomenon corresponded with the tendency proposed in a previous report by the authors for the number of rolling elements to get high rotational accuracy.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114247950","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}
In recent year, it is reported that roll and lateral vehicle motions are affected by the road input, and the characteristic of vehicle motions changes depending on the vehicle speed. However, there are few researches about a suspension control method which takes into consideration with the suspension characteristic that is the toe change and scuff caused by suspension stroke and tire side-force. In this paper, new active suspension control method is proposed to reduce the vehicle vibration and vehicle lateral motion due to the road input. Firstly, a vehicle model including the suspension characteristic is constructed. Next, the time delay of the road input from the front wheel to the rear wheel is modeled with Pade approximation. Then we formulate the linear parameter varying system taking amount of vehicle speed. The gain-scheduling controller based on the linear matrix inequalities which sets the lateral acceleration of the vehicle to one of controlled outputs is proposed. Finally, in order to verify the effectiveness of the proposed control method, the simulation is carried out by using the full vehicle model. From the result, it was confirmed that the proposed gain-scheduling controller can reduce the vertical and lateral motions caused by road disturbance at a different vehicle speed better than a normal H∞ controller.
{"title":"Active suspension control considering lateral vehicle dynamics due to road input at different vehicle speed","authors":"Takuma Suzuki, Masaki Takahashi","doi":"10.1299/KIKAIC.78.446","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.446","url":null,"abstract":"In recent year, it is reported that roll and lateral vehicle motions are affected by the road input, and the characteristic of vehicle motions changes depending on the vehicle speed. However, there are few researches about a suspension control method which takes into consideration with the suspension characteristic that is the toe change and scuff caused by suspension stroke and tire side-force. In this paper, new active suspension control method is proposed to reduce the vehicle vibration and vehicle lateral motion due to the road input. Firstly, a vehicle model including the suspension characteristic is constructed. Next, the time delay of the road input from the front wheel to the rear wheel is modeled with Pade approximation. Then we formulate the linear parameter varying system taking amount of vehicle speed. The gain-scheduling controller based on the linear matrix inequalities which sets the lateral acceleration of the vehicle to one of controlled outputs is proposed. Finally, in order to verify the effectiveness of the proposed control method, the simulation is carried out by using the full vehicle model. From the result, it was confirmed that the proposed gain-scheduling controller can reduce the vertical and lateral motions caused by road disturbance at a different vehicle speed better than a normal H∞ controller.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128039507","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}
Daiki Hirata, Yasuyuki Yamada, Takeshi Omuro, T. Morita
This paper proposes a new jumping unit that using chemical energy. Conventional jumping robots have difficulties to equip both lightweight and high output energy at the same time. In regard to this, chemical energy of black powder was adopted. Using explosives allows jumping robots to get high energy instantaneously. First of all, acceleration and velocity characteristics of the cylinder were clarified by experimental cylinder. The approximate expression of pressure change in the cylinder was derived based on the characteristics. Second, expressions of jumping theory were lead and relationships between some parameters (mass, rod-area, cylinder stroke) and jumping height were simulated. Curves with a peak were given from all of those parameters and existence of optimal value was clarified. The significance of the simulation was shown by jumping motion of about 2000mm by the experiment. Finally, four-legged robot dummy with jumping unit that change direction, control of height and isolated ignition were available, is developed. Trajectory of jumping motion was examined when the direction of cylinder was changed from vertical condition. Effectiveness of proposed method was confirmed from jumping height of 720mm with cylinder angle of 10 degree.
{"title":"Cylinder shaped jumping unit using explosion-characteristics of gunpowder","authors":"Daiki Hirata, Yasuyuki Yamada, Takeshi Omuro, T. Morita","doi":"10.1299/KIKAIC.78.547","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.547","url":null,"abstract":"This paper proposes a new jumping unit that using chemical energy. Conventional jumping robots have difficulties to equip both lightweight and high output energy at the same time. In regard to this, chemical energy of black powder was adopted. Using explosives allows jumping robots to get high energy instantaneously. First of all, acceleration and velocity characteristics of the cylinder were clarified by experimental cylinder. The approximate expression of pressure change in the cylinder was derived based on the characteristics. Second, expressions of jumping theory were lead and relationships between some parameters (mass, rod-area, cylinder stroke) and jumping height were simulated. Curves with a peak were given from all of those parameters and existence of optimal value was clarified. The significance of the simulation was shown by jumping motion of about 2000mm by the experiment. Finally, four-legged robot dummy with jumping unit that change direction, control of height and isolated ignition were available, is developed. Trajectory of jumping motion was examined when the direction of cylinder was changed from vertical condition. Effectiveness of proposed method was confirmed from jumping height of 720mm with cylinder angle of 10 degree.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130324073","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}
This paper proposes a method of acoustic vibration testing based on a point source generated by laserinduced breakdown in the air. A highpower Nd: YAG pulse laser is used in this system for generating the laserinduced breakdown in acoustic fields. Plasma formation can be realized by the laserinduced breakdown if the local intensity of the laser beam reaches 10 W/m. The shock wave that is yielded by consuming a part of the plasma energy becomes a sound source. Assuming that the laser beam is focused to a small volume through a convex lens and the sound source by the laser inducedbreakdown has nondirectional property, it is possible to create a point source with this technique. Securing the laser light path installs no device for acoustic excitation in acoustic fields. The system is validated by comparing the resonant frequencies of a microspace measured by the laserinduced breakdown and calculated by theoretical model.
{"title":"Acoustic vibration testing in a micro-space based on a point source generated by laser-induced breakdown","authors":"N. Hosoya, M. Nagata, I. Kajiwara","doi":"10.1299/KIKAIC.78.770","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.770","url":null,"abstract":"This paper proposes a method of acoustic vibration testing based on a point source generated by laserinduced breakdown in the air. A highpower Nd: YAG pulse laser is used in this system for generating the laserinduced breakdown in acoustic fields. Plasma formation can be realized by the laserinduced breakdown if the local intensity of the laser beam reaches 10 W/m. The shock wave that is yielded by consuming a part of the plasma energy becomes a sound source. Assuming that the laser beam is focused to a small volume through a convex lens and the sound source by the laser inducedbreakdown has nondirectional property, it is possible to create a point source with this technique. Securing the laser light path installs no device for acoustic excitation in acoustic fields. The system is validated by comparing the resonant frequencies of a microspace measured by the laserinduced breakdown and calculated by theoretical model.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122224664","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}
Ultrasonic technique is an indispensable diagnostics to evaluate internal conditions. The conventional ultrasonic technique using a wave property, such as a reflected wave, wave speed, attenuation of amplitude and frequency spectrum is, however, not effective in some cases. In this study, we propose to use an instantaneous frequency of the ultrasonic pulse. The instantaneous frequency expresses a transition of the frequency of the ultrasonic pulse, so that it is sensitive to a slight variation of the ultrasonic frequency. The effectiveness is demonstrated through an experiment on adhesive strength of epoxy adhesive, which is controlled by curing process. The conventional ultrasonic technique is difficult for an evaluation of this adhesive strength. On one hand, the instantaneous frequency of an ultrasonic pulse, which passes through the adhesive layer, certainly distinguishes the difference of the adhesive strength. It is also shown that the adhesive characteristics pertaining to their strength are modeled as damping coefficients, which is demonstrated through a simple simulation of one-dimensional ultrasonic wave propagation.
{"title":"New diagnostic method using instantaneous frequency of ultrasonic pulse (evaluation of adhesive strength of epoxy resin)","authors":"Takumi Inoue, Takahiro Nakano","doi":"10.1299/KIKAIC.77.2993","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.2993","url":null,"abstract":"Ultrasonic technique is an indispensable diagnostics to evaluate internal conditions. The conventional ultrasonic technique using a wave property, such as a reflected wave, wave speed, attenuation of amplitude and frequency spectrum is, however, not effective in some cases. In this study, we propose to use an instantaneous frequency of the ultrasonic pulse. The instantaneous frequency expresses a transition of the frequency of the ultrasonic pulse, so that it is sensitive to a slight variation of the ultrasonic frequency. The effectiveness is demonstrated through an experiment on adhesive strength of epoxy adhesive, which is controlled by curing process. The conventional ultrasonic technique is difficult for an evaluation of this adhesive strength. On one hand, the instantaneous frequency of an ultrasonic pulse, which passes through the adhesive layer, certainly distinguishes the difference of the adhesive strength. It is also shown that the adhesive characteristics pertaining to their strength are modeled as damping coefficients, which is demonstrated through a simple simulation of one-dimensional ultrasonic wave propagation.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130835238","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}
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