M. Kashihara, Kosuke Yamamoto, M. Furuta, H. Yonetani, T. Tsumura, K. Nakata, S. Y. Kim, Shinsuke Suzuki, H. Nakajima
Lotus-type porous carbon steel (lotus carbon steel) plates with a porosity of 50% were fabricated by continuous casting technique. A saddle was built by welding the fabricated lotus carbon steel plates together and was loaded on a machining center. The static stiffness, cutting performance, dynamic characteristics, electrical consumption and thermal displacement of the machining center were evaluated. Although the weight of the saddle was reduced largely by 41% compared with a conventional saddle made of cast iron, the reduction of the static stiffness was only 13-27% and the degradation of the cutting performance was not so significant. These results were due to high flexural rigidity and torsional rigidity per unit weight of the lotus carbon steel plate compared with nonporous cast iron parts, since the lotus carbon steel plate had a unique structure with nonporous skin surfaces and porous part inside. The thermal displacements of the saddle made of lotus carbon steel were 17-36% larger than that of cast iron. Furthermore, the reduction of the weight of the saddle resulted in a reduction of the required time for acceleration by half and a reduction of the energy consumption during machining by 15-20 %.
{"title":"Application of lotus-type porous carbon steel to moving body of machine tools","authors":"M. Kashihara, Kosuke Yamamoto, M. Furuta, H. Yonetani, T. Tsumura, K. Nakata, S. Y. Kim, Shinsuke Suzuki, H. Nakajima","doi":"10.1299/KIKAIC.77.4693","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.4693","url":null,"abstract":"Lotus-type porous carbon steel (lotus carbon steel) plates with a porosity of 50% were fabricated by continuous casting technique. A saddle was built by welding the fabricated lotus carbon steel plates together and was loaded on a machining center. The static stiffness, cutting performance, dynamic characteristics, electrical consumption and thermal displacement of the machining center were evaluated. Although the weight of the saddle was reduced largely by 41% compared with a conventional saddle made of cast iron, the reduction of the static stiffness was only 13-27% and the degradation of the cutting performance was not so significant. These results were due to high flexural rigidity and torsional rigidity per unit weight of the lotus carbon steel plate compared with nonporous cast iron parts, since the lotus carbon steel plate had a unique structure with nonporous skin surfaces and porous part inside. The thermal displacements of the saddle made of lotus carbon steel were 17-36% larger than that of cast iron. Furthermore, the reduction of the weight of the saddle resulted in a reduction of the required time for acceleration by half and a reduction of the energy consumption during machining by 15-20 %.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"21 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":"126950958","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. Gofuku, Wanli Shan, M. Shibata, A. Yamanishi, T. Kamegawa
This study develops a mixing machine driven by a spherical motor that can rotate around any axis. The developed mixing machine is composed of a rotor, a stator, a control PC, an electro-magnet excitation circuit, and a power supply. The rotor that its outer diameter is 200 [mm] is composed of double spherical shells in order to contain liquid in its inner spherical shell. Totally 91 permanent magnets are arranged in almost spherical symmetry on the inner surface of the outer spherical shell. On the other hand, 80 electro-magnets are arranged on the stator of a semi-spherical shell. The applicability of the mixing machine to material production under the condition of small influence of gravitational force is evaluated by mixing experiments to dissolve salt of 50 [g] in water of 200 [g]. The mixing performance is compared for five mixing methods. The results show that the mixing performance of the method to change randomly the rotation direction is only slightly lower than that of the method of rotating continuously around a horizontal axis that exhibits the highest mixing performance.
{"title":"Development of a mixing machine driven by a spherical motor","authors":"A. Gofuku, Wanli Shan, M. Shibata, A. Yamanishi, T. Kamegawa","doi":"10.1299/KIKAIC.77.2400","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.2400","url":null,"abstract":"This study develops a mixing machine driven by a spherical motor that can rotate around any axis. The developed mixing machine is composed of a rotor, a stator, a control PC, an electro-magnet excitation circuit, and a power supply. The rotor that its outer diameter is 200 [mm] is composed of double spherical shells in order to contain liquid in its inner spherical shell. Totally 91 permanent magnets are arranged in almost spherical symmetry on the inner surface of the outer spherical shell. On the other hand, 80 electro-magnets are arranged on the stator of a semi-spherical shell. The applicability of the mixing machine to material production under the condition of small influence of gravitational force is evaluated by mixing experiments to dissolve salt of 50 [g] in water of 200 [g]. The mixing performance is compared for five mixing methods. The results show that the mixing performance of the method to change randomly the rotation direction is only slightly lower than that of the method of rotating continuously around a horizontal axis that exhibits the highest mixing performance.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"150 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":"117316744","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}
T. Nagamine, Y. Minegishi, A. Sekiya, Masahiro Goto, K. Takaki, H. Mori, Yuichi Sato
This paper describes experimental study of nappe oscillation at a weir which is two meters high. Falling water sheet flowing over a weir sometimes oscillates at a low frequency. The water sheet oscillation causes low frequency sound problems. So far, spoilers are used to prevent from such vibrations. We develop the new equipment to suppress low frequency oscillation and investigate how to suppress low frequency sound from nappe oscillation. Its sound can be suppressed by setting equipment at the lower end of a falling water sheet. Experimental results show the characteristic of nappe oscillation and effectiveness of the equipment on low frequency sound.
{"title":"Development of the equipment to suppress low frequency nappe oscillation","authors":"T. Nagamine, Y. Minegishi, A. Sekiya, Masahiro Goto, K. Takaki, H. Mori, Yuichi Sato","doi":"10.1299/KIKAIC.77.2211","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.2211","url":null,"abstract":"This paper describes experimental study of nappe oscillation at a weir which is two meters high. Falling water sheet flowing over a weir sometimes oscillates at a low frequency. The water sheet oscillation causes low frequency sound problems. So far, spoilers are used to prevent from such vibrations. We develop the new equipment to suppress low frequency oscillation and investigate how to suppress low frequency sound from nappe oscillation. Its sound can be suppressed by setting equipment at the lower end of a falling water sheet. Experimental results show the characteristic of nappe oscillation and effectiveness of the equipment on low frequency sound.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"64 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":"127023353","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}
To determine the effects of aging on the accuracy of perceived foot position, we conducted following experiment to 10 elderly and 10 young participants. Participants were asked to adjust the position of the target line as close as possible to either most medial or most lateral parts of their foot, while they wore a modified cape that obscured their view of their feet. Once they felt that target line was appropriately placed along the foot, the distance between the line and the foot was measured. No age-related differences were identified when they were asked to place the line along with the most lateral part of their foot. Both age groups tended to place the line 10-20 mm over the foot. However, the elderly displayed smaller errors than young when they were asked to place the line along with the most medial part of their foot. We also discussed the possible reasons that explain these features in the article.
{"title":"Feature of the errors between the perceived toe position and actual toe position (comparison of the features between elderly participants and young participants)","authors":"Y. Nagao, Yoshiyuki Kobayashi, H. Fujimoto","doi":"10.1299/KIKAIC.77.4181","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.4181","url":null,"abstract":"To determine the effects of aging on the accuracy of perceived foot position, we conducted following experiment to 10 elderly and 10 young participants. Participants were asked to adjust the position of the target line as close as possible to either most medial or most lateral parts of their foot, while they wore a modified cape that obscured their view of their feet. Once they felt that target line was appropriately placed along the foot, the distance between the line and the foot was measured. No age-related differences were identified when they were asked to place the line along with the most lateral part of their foot. Both age groups tended to place the line 10-20 mm over the foot. However, the elderly displayed smaller errors than young when they were asked to place the line along with the most medial part of their foot. We also discussed the possible reasons that explain these features in the article.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"32 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":"121139774","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}
T. Irie, Hideo Nakanishi, H. Uragaki, Naofumi Fujita
We created virtual soft media by using a haptic device and performed a sensory test focusing on proprioceptive sensation in muscles and tendons. The depths of the virtual media were 30 mm and their spring rates changed according to the displacement. Subjects handled the end-effecter of the haptic device and pushed a pointer into virtual media in a display monitor to sense feedback force calculated by a personal computer. Two experiments were performed to elucidate a part of the sensory perception mechanism. In the experiment 1, subjects evaluated the hardness of the virtual media sensing the whole mechanical characteristics from the surface to the bottom. In the experiment 2, they evaluated the hardness in the range from the surface to the depth of just over 25 mm. The hardness evaluation scores in the exp. 2 were significantly higher than those in the exp. 1 on ANOVA. The changes of spring rates also affected the hardness evaluation scores significantly. We examined the optimal model, which explained the sensory perception mechanism, with covariance structure analysis. As a result, the optimal models of the exp. 1 and the exp. 2 were unified, and the hardness evaluation scores were explained with the mean values and the slopes of logarithmic spring rates. This optical model suggested that subjects could correctly acquire the hardness information of soft media by using the mean values and the slopes, even though they did not have the whole mechanical characteristics.
{"title":"Sensory Perception of Virtual Soft Media which Change their Spring Rates According to Displacement","authors":"T. Irie, Hideo Nakanishi, H. Uragaki, Naofumi Fujita","doi":"10.1299/KIKAIC.77.4663","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.4663","url":null,"abstract":"We created virtual soft media by using a haptic device and performed a sensory test focusing on proprioceptive sensation in muscles and tendons. The depths of the virtual media were 30 mm and their spring rates changed according to the displacement. Subjects handled the end-effecter of the haptic device and pushed a pointer into virtual media in a display monitor to sense feedback force calculated by a personal computer. Two experiments were performed to elucidate a part of the sensory perception mechanism. In the experiment 1, subjects evaluated the hardness of the virtual media sensing the whole mechanical characteristics from the surface to the bottom. In the experiment 2, they evaluated the hardness in the range from the surface to the depth of just over 25 mm. The hardness evaluation scores in the exp. 2 were significantly higher than those in the exp. 1 on ANOVA. The changes of spring rates also affected the hardness evaluation scores significantly. We examined the optimal model, which explained the sensory perception mechanism, with covariance structure analysis. As a result, the optimal models of the exp. 1 and the exp. 2 were unified, and the hardness evaluation scores were explained with the mean values and the slopes of logarithmic spring rates. This optical model suggested that subjects could correctly acquire the hardness information of soft media by using the mean values and the slopes, even though they did not have the whole mechanical characteristics.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"41 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":"130101294","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 proposes a carbon taxation scheme using life cycle assessment (LCA) for clean energy vehicles (CEVs). This taxation scheme can enable to be discussed tax amount, tax revenue and total CO 2 emissions by changing the scenarios and parameters, such as: technology development, energy price and total driving distance. The authors figure out the tax rate 28.05[JPY/kg-CO 2 ], which makes the hybrid electric vehicle’s life cycle cost (LCC) less than that of conventional gasoline vehicles. The simulation results show that LCC after taxation of electric vehicles (EVs) have lowest total cost when battery cost is 0.14 times the 2007 cost and have lower total cost than that of GVs when driven more than 221,600 km. In addition, EVs have lowest emissions when driven more than 63,000 km considered CO 2 emissions in the manufacturing phase, and it is expected that elders who drive shorter distances are best suited for hybrid electric vehicles and gasoline vehicles not electric vehicles considering LCCO 2 . The proposed tax system can provide consumers with an incentive to choose vehicles with lower CO 2 emissions.
{"title":"Carbon taxation using LCCO2 and LCC for clean energy vehicles","authors":"Tomomi Nonaka, M. Nakano","doi":"10.1299/KIKAIC.77.4024","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.4024","url":null,"abstract":"The paper proposes a carbon taxation scheme using life cycle assessment (LCA) for clean energy vehicles (CEVs). This taxation scheme can enable to be discussed tax amount, tax revenue and total CO 2 emissions by changing the scenarios and parameters, such as: technology development, energy price and total driving distance. The authors figure out the tax rate 28.05[JPY/kg-CO 2 ], which makes the hybrid electric vehicle’s life cycle cost (LCC) less than that of conventional gasoline vehicles. The simulation results show that LCC after taxation of electric vehicles (EVs) have lowest total cost when battery cost is 0.14 times the 2007 cost and have lower total cost than that of GVs when driven more than 221,600 km. In addition, EVs have lowest emissions when driven more than 63,000 km considered CO 2 emissions in the manufacturing phase, and it is expected that elders who drive shorter distances are best suited for hybrid electric vehicles and gasoline vehicles not electric vehicles considering LCCO 2 . The proposed tax system can provide consumers with an incentive to choose vehicles with lower CO 2 emissions.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"11 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":"131931161","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 this paper, the results of experimental and analytical studies of the performance of a new electrostatic separator for plastic mixtures for recycling are presented. The separator is of the free fall type and consists of four cylindrical electrodes. Prior to separation, plastic mixtures to be separated are tribocharged. When the charged particles are fed into the center of the space between the four electrodes, they are attracted to the space between the electrodes with voltages of polarity opposite to the particles' charge because of Coulomb force. Therefore, the plastic mixtures can be separated as a result of the different positions to which they fall. Separation tests were performed on a sample containing 50% polystyrene and 50% ABS plastics. Plastic particles obtained from crushed plastic plates were used. It was found that the separation efficiency depends on the electric potential difference between positive and negative electrodes, tribocharging time, the rotation speed of the tribocharger and the length of the electrodes. It was also found that it is possible to obtain a high purity and a high recovery rate for a binary plastic mixture.
{"title":"Development of electrostatic separator using cylindrical electrodes","authors":"M. Saeki","doi":"10.1299/KIKAIC.77.2953","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.2953","url":null,"abstract":"In this paper, the results of experimental and analytical studies of the performance of a new electrostatic separator for plastic mixtures for recycling are presented. The separator is of the free fall type and consists of four cylindrical electrodes. Prior to separation, plastic mixtures to be separated are tribocharged. When the charged particles are fed into the center of the space between the four electrodes, they are attracted to the space between the electrodes with voltages of polarity opposite to the particles' charge because of Coulomb force. Therefore, the plastic mixtures can be separated as a result of the different positions to which they fall. Separation tests were performed on a sample containing 50% polystyrene and 50% ABS plastics. Plastic particles obtained from crushed plastic plates were used. It was found that the separation efficiency depends on the electric potential difference between positive and negative electrodes, tribocharging time, the rotation speed of the tribocharger and the length of the electrodes. It was also found that it is possible to obtain a high purity and a high recovery rate for a binary plastic mixture.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"32 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":"121233377","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 this paper we revisit the PID control design in terms of descriptor expression. Based on the descriptor expression of the derivative action in the PID controller, we consider PID control design utilizing standard nonlinear optimal control problem. Therefore, although the resultant control problem includes mixed constraint conditions with states and inputs, the real time optimization tool (MPC, for instance) can be applicable as one of the most powerful methods for tuning of PID parameters. Finally, some simulations are given to illustrate the effectiveness of the proposed approach.
{"title":"Lid control design via descriptor expression","authors":"J. Imae, K. Yoshimura, G. Zhai, Tomoaki Kobayashi","doi":"10.1299/KIKAIC.77.755","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.755","url":null,"abstract":"In this paper we revisit the PID control design in terms of descriptor expression. Based on the descriptor expression of the derivative action in the PID controller, we consider PID control design utilizing standard nonlinear optimal control problem. Therefore, although the resultant control problem includes mixed constraint conditions with states and inputs, the real time optimization tool (MPC, for instance) can be applicable as one of the most powerful methods for tuning of PID parameters. Finally, some simulations are given to illustrate the effectiveness of the proposed approach.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"36 6 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":"123354183","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 this paper, we propose a passive gravity compensation mechanism with two cylinders connected pipeline and a spring element, which named “Hydraulic Gravity Canceller (HGC).” From development and experiments of a single link model equipped with the HGC, it is clarified that this new device has many advantages in comparison with the original ”Mechanical Gravity Canceller (MGC)”and other passive gravity compensation mechanisms. First, this paper describes the new mechanism generates accurate weight compensation torque as same as the MGC without restrictions of spring arrangement and spring constant, because it consists of Pascal's principle-driven mechanism. Next, it is shown that the new mechanism can be installed into heavy manipulators or carry heavy loads while ensuring high rigidity and safety, since there is no risk for amputation of wire. Finally, the new mechanism can be easily added other functions as well as compensation mechanism by fluid pipeline networks. From there, the HGC is new device succeeds to change basic concepts of weight compensation mechanism.
{"title":"Development of hydraulic gravity canceller with a booster","authors":"Yasuyuki Yamada, T. Morita","doi":"10.1299/KIKAIC.77.2576","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.2576","url":null,"abstract":"In this paper, we propose a passive gravity compensation mechanism with two cylinders connected pipeline and a spring element, which named “Hydraulic Gravity Canceller (HGC).” From development and experiments of a single link model equipped with the HGC, it is clarified that this new device has many advantages in comparison with the original ”Mechanical Gravity Canceller (MGC)”and other passive gravity compensation mechanisms. First, this paper describes the new mechanism generates accurate weight compensation torque as same as the MGC without restrictions of spring arrangement and spring constant, because it consists of Pascal's principle-driven mechanism. Next, it is shown that the new mechanism can be installed into heavy manipulators or carry heavy loads while ensuring high rigidity and safety, since there is no risk for amputation of wire. Finally, the new mechanism can be easily added other functions as well as compensation mechanism by fluid pipeline networks. From there, the HGC is new device succeeds to change basic concepts of weight compensation mechanism.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"34 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":"128779626","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 vibration testing and health monitoring system based on an impulse response excited by a laser ablation. High power YAG pulse laser is used in this system for producing an ideal impulse force on structural surface. It is possible to measure high frequency vibration responses in this system. A health monitoring system is constructed by this vibration testing system and a damage detecting algorithm. A microscopic damage of structures can be extracted by detecting fluctuations of high frequency vibration response with the present health monitoring system. In this study, loosening of bolt tightening torques is defined as the damage of the system. The damage is detected and identified by statistical evaluations of measured frequency response data with Recognition-Taguchi method.
{"title":"Health monitoring based on high frequency vibration measurement with laser","authors":"D. Miyamoto, I. Kajiwara, N. Hosoya, C. Nishidome","doi":"10.1299/KIKAIC.77.1760","DOIUrl":"https://doi.org/10.1299/KIKAIC.77.1760","url":null,"abstract":"This paper proposes a vibration testing and health monitoring system based on an impulse response excited by a laser ablation. High power YAG pulse laser is used in this system for producing an ideal impulse force on structural surface. It is possible to measure high frequency vibration responses in this system. A health monitoring system is constructed by this vibration testing system and a damage detecting algorithm. A microscopic damage of structures can be extracted by detecting fluctuations of high frequency vibration response with the present health monitoring system. In this study, loosening of bolt tightening torques is defined as the damage of the system. The damage is detected and identified by statistical evaluations of measured frequency response data with Recognition-Taguchi method.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"20 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":"121843889","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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