Pub Date : 1900-01-01DOI: 10.1299/transjsme.20-00072
Wei Zhao, R. Zheng, X. Yin, Xilu Zhao, Kimihiko Nakano
Vibrational energy harvesting by application of stochastic resonance is receiving more and more attentions at the international level in recent years. However, the vibrational power conversion efficiency is still limited due to small excitation amplitude of the traditional bistable vibration model, and how to develop a high-efficient vibration energy harvester has been become an important research topic. Therefore, this study proposed a diagonally supported spring-mass system as a novel bistable vibration energy harvester using a piezoelectric element. In this system, the ordinary elastic spring has been replaced by an elastic bending plate with a spring; furthermore, the piezoelectric element is attached on the surface of the elastic bending plate to harvest vibration power. On the basis of a comprehensively theoretical analysis, Runge-Kutta method is adopted to propose a numerical analysis method, and the vibrational analysis results are consistent with the measuring results. With the procedure of experimental study, as a result vibrational response amplitude was greatly amplified under the occurrence of stochastic resonance phenomenon.
{"title":"Bistable vibration harvesting system of diagonally supported spring-mass by using piezoelectric element","authors":"Wei Zhao, R. Zheng, X. Yin, Xilu Zhao, Kimihiko Nakano","doi":"10.1299/transjsme.20-00072","DOIUrl":"https://doi.org/10.1299/transjsme.20-00072","url":null,"abstract":"Vibrational energy harvesting by application of stochastic resonance is receiving more and more attentions at the international level in recent years. However, the vibrational power conversion efficiency is still limited due to small excitation amplitude of the traditional bistable vibration model, and how to develop a high-efficient vibration energy harvester has been become an important research topic. Therefore, this study proposed a diagonally supported spring-mass system as a novel bistable vibration energy harvester using a piezoelectric element. In this system, the ordinary elastic spring has been replaced by an elastic bending plate with a spring; furthermore, the piezoelectric element is attached on the surface of the elastic bending plate to harvest vibration power. On the basis of a comprehensively theoretical analysis, Runge-Kutta method is adopted to propose a numerical analysis method, and the vibrational analysis results are consistent with the measuring results. With the procedure of experimental study, as a result vibrational response amplitude was greatly amplified under the occurrence of stochastic resonance phenomenon.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129068600","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}
Pub Date : 1900-01-01DOI: 10.1299/TRANSJSME.18-00437
Mori Atsuo, Yuichi Matsumura, H. Izumiya
On recent machine structures, the size of subsystems is far smaller than the whole structure. Therefore, the compliance of a subsystem is dominated by a rigid body mode at the frequency of interest. In case like this, even if degrees of freedom at the connection are multiple, few degrees of freedom of transmission forces dominate the resonance of a whole structure. Therefore, countermeasure based on existence of one or two dominant degrees of freedom of transmission forces is effective. Then, in this study, a design method in case that a single degree of freedom transmission force is dominant, is organized. A countermeasure method for vibration and noise of a whole structure using FRF based sub-structuring and a neutralizer is proposed. As an original viewpoint of this study, with a restriction that only subsystems can be structurally modified, it is an approach at subsystems only, for reducing vibration of a whole structure at a single target frequency. FRF based sub-structuring is adopted to identify coupling characteristics of two rigidly coupled systems. Neutralizer is adopted to set up virtual fixing end at a transmission path on subsystems, to realize perfect reflection of wave motion at the path. As a result, vibration transmission and wave propagation from an exciting degree of freedom on a subsystem to an evaluating degree of freedom on a whole structure at a target frequency is theoretically zero. There were some worries to occur resonance on the whole system as abuses of the proposed method, but assuming that there is some damping at whole structure, the method proved to be effective on any whole structure.
{"title":"Vibration reduction method using passive control of wave propagation by a neutralizer","authors":"Mori Atsuo, Yuichi Matsumura, H. Izumiya","doi":"10.1299/TRANSJSME.18-00437","DOIUrl":"https://doi.org/10.1299/TRANSJSME.18-00437","url":null,"abstract":"On recent machine structures, the size of subsystems is far smaller than the whole structure. Therefore, the compliance of a subsystem is dominated by a rigid body mode at the frequency of interest. In case like this, even if degrees of freedom at the connection are multiple, few degrees of freedom of transmission forces dominate the resonance of a whole structure. Therefore, countermeasure based on existence of one or two dominant degrees of freedom of transmission forces is effective. Then, in this study, a design method in case that a single degree of freedom transmission force is dominant, is organized. A countermeasure method for vibration and noise of a whole structure using FRF based sub-structuring and a neutralizer is proposed. As an original viewpoint of this study, with a restriction that only subsystems can be structurally modified, it is an approach at subsystems only, for reducing vibration of a whole structure at a single target frequency. FRF based sub-structuring is adopted to identify coupling characteristics of two rigidly coupled systems. Neutralizer is adopted to set up virtual fixing end at a transmission path on subsystems, to realize perfect reflection of wave motion at the path. As a result, vibration transmission and wave propagation from an exciting degree of freedom on a subsystem to an evaluating degree of freedom on a whole structure at a target frequency is theoretically zero. There were some worries to occur resonance on the whole system as abuses of the proposed method, but assuming that there is some damping at whole structure, the method proved to be effective on any whole structure.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124552793","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}
Pub Date : 1900-01-01DOI: 10.1299/TRANSJSME.21-00053
T. Matsubara, Akihisa Iwasaki, K. Aida, H. Sakamoto
A method to retain a cask by a retention plate has been developed. In this method, a small fitting gap between the bottom of the cask and the circular hollow of the retention plate controls movement of the cask in the range of the circular hollow area at an earthquake. The fitting of the cask and the retention plate absorbs the seismic energy by the motion of the cask and the collision between them. Characteristics of the vibration behavior of the cask with the retention plate were analyzed by dynamic analysis. As a result of the analysis, the cask does not get out of the retention plate or fall down during an earthquake. The movement of the cask mainly consists of three basic motions, slipping motion, rocking motion, and rotating motion, and reaction force between the cask and the retention plate becomes the maximum in rocking motion. The strength integrity of the retention plate was also confirmed under condition of the maximum reaction force, and the function of the retention plate, which is to keep the cask as standing at an earthquake, was maintained. In addition, characteristics of the vibration behavior of the cask and the design of the retention plate were validated by 1/4 scale mock-up seismic test.
{"title":"Development of retention plate which holds spent fuel cask","authors":"T. Matsubara, Akihisa Iwasaki, K. Aida, H. Sakamoto","doi":"10.1299/TRANSJSME.21-00053","DOIUrl":"https://doi.org/10.1299/TRANSJSME.21-00053","url":null,"abstract":"A method to retain a cask by a retention plate has been developed. In this method, a small fitting gap between the bottom of the cask and the circular hollow of the retention plate controls movement of the cask in the range of the circular hollow area at an earthquake. The fitting of the cask and the retention plate absorbs the seismic energy by the motion of the cask and the collision between them. Characteristics of the vibration behavior of the cask with the retention plate were analyzed by dynamic analysis. As a result of the analysis, the cask does not get out of the retention plate or fall down during an earthquake. The movement of the cask mainly consists of three basic motions, slipping motion, rocking motion, and rotating motion, and reaction force between the cask and the retention plate becomes the maximum in rocking motion. The strength integrity of the retention plate was also confirmed under condition of the maximum reaction force, and the function of the retention plate, which is to keep the cask as standing at an earthquake, was maintained. In addition, characteristics of the vibration behavior of the cask and the design of the retention plate were validated by 1/4 scale mock-up seismic test.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124657793","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}
Pub Date : 1900-01-01DOI: 10.1299/transjsme.22-00073
M. Yamane, H. Uematsu, S. Tanoue
{"title":"Effect of layer thickness of prepreg on tensile properties of quasi-isotropic carbon fiber reinforced polyamide 6","authors":"M. Yamane, H. Uematsu, S. Tanoue","doi":"10.1299/transjsme.22-00073","DOIUrl":"https://doi.org/10.1299/transjsme.22-00073","url":null,"abstract":"","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124757859","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}
Pub Date : 1900-01-01DOI: 10.1299/transjsme.20-00306
S. Matsuoka, Y. Furuya, Etsuo Takeuchi, H. Hirukawa, H. Matsunaga
In order to investigate the effect of hydrogen on Slow Strain Rate Tensile (SSRT) test of austenitic stainless steels, SUS304, SUS316 and SUS316L, two types of SSRT tests were conducted. One is the external hydrogen SSRT test that was conducted in hydrogen gas at temperatures of T = −40 ~ 200°C and pressures of p = 87 ~ 115 MPa using non-charged specimen. Another is the internal hydrogen SSRT test that was conducted in ambient air or 0.1 MPa nitrogen gas at T = −120 ~ 200°C using hydrogen-charged specimen exposed to hydrogen gas at p = 68 or 100 MPa. SSRT properties (i.e., relative reduction in area, RRA, and relative tensile strength, RTS) obtained in the external and internal hydrogen tests corresponded to each other. The results inferred that the internal hydrogen test can be a substitute for the external hydrogen test. Furthermore, the temperature dependence of RRA and RTS was evaluated based on the austenite stability of materials, which was represented by Md30 temperature, in association with martensitic transformation-induced plasticity. It was found that RRA and RTS of SUS304, SUS316 and SUS316L having different austenitic stabilities were successfully unified by using the novel parameter, T−Md30.
{"title":"Effect of external/internal hydrogen on SSRT properties of austenitic stainless steels and the role of martensitic transformation-induced plasticity","authors":"S. Matsuoka, Y. Furuya, Etsuo Takeuchi, H. Hirukawa, H. Matsunaga","doi":"10.1299/transjsme.20-00306","DOIUrl":"https://doi.org/10.1299/transjsme.20-00306","url":null,"abstract":"In order to investigate the effect of hydrogen on Slow Strain Rate Tensile (SSRT) test of austenitic stainless steels, SUS304, SUS316 and SUS316L, two types of SSRT tests were conducted. One is the external hydrogen SSRT test that was conducted in hydrogen gas at temperatures of T = −40 ~ 200°C and pressures of p = 87 ~ 115 MPa using non-charged specimen. Another is the internal hydrogen SSRT test that was conducted in ambient air or 0.1 MPa nitrogen gas at T = −120 ~ 200°C using hydrogen-charged specimen exposed to hydrogen gas at p = 68 or 100 MPa. SSRT properties (i.e., relative reduction in area, RRA, and relative tensile strength, RTS) obtained in the external and internal hydrogen tests corresponded to each other. The results inferred that the internal hydrogen test can be a substitute for the external hydrogen test. Furthermore, the temperature dependence of RRA and RTS was evaluated based on the austenite stability of materials, which was represented by Md30 temperature, in association with martensitic transformation-induced plasticity. It was found that RRA and RTS of SUS304, SUS316 and SUS316L having different austenitic stabilities were successfully unified by using the novel parameter, T−Md30.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129636209","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}
Pub Date : 1900-01-01DOI: 10.1299/JSMEMECJ.2018.S1320203
A. Miyake, Ayako Kitakaze, Seiko Katoh, Masahiro Muramatsu, Noguchi Kenji, K. Sannomiya, Takaichi Nakaya, H. Sasahara
LFV is one of effective machining technologies to break long and continuous chips in the turning process. LFV technology stands for low frequency vibration cutting. Vibration in the tool feed direction is applied in LFV and it is synchronously controlled with the spindle rotation. When the machined surface is focused on, characteristic surface patterns are formed in LFV turning process because of the tool vibration in feed direction. In this paper, a simulation technique to visualize the surface profile generated on the cutting process with LFV was developed. By visualizing the surface shape and contour shape, it is possible to clarify its features and calculate the surface roughness and roundness. During LFV operation, unlike conventional turning with constant feed rate, a cutting edge moves on the machined surface while vibrating in feed direction; hence characteristic patterns are formed by the uncut portion corresponding to the crossing cutter marks depending on the vibration conditions. The influence of such characteristic patterns on the surface roughness and the contour profile was clarified in detail. In addition, the vibration condition which can minimize roundness of the machined object was identified by using the developed simulation. Then the contour profile of the machined parts during LFV operation could be controlled.
{"title":"Influence on surface characteristics generated in Low Frequency Vibration Cutting","authors":"A. Miyake, Ayako Kitakaze, Seiko Katoh, Masahiro Muramatsu, Noguchi Kenji, K. Sannomiya, Takaichi Nakaya, H. Sasahara","doi":"10.1299/JSMEMECJ.2018.S1320203","DOIUrl":"https://doi.org/10.1299/JSMEMECJ.2018.S1320203","url":null,"abstract":"LFV is one of effective machining technologies to break long and continuous chips in the turning process. LFV technology stands for low frequency vibration cutting. Vibration in the tool feed direction is applied in LFV and it is synchronously controlled with the spindle rotation. When the machined surface is focused on, characteristic surface patterns are formed in LFV turning process because of the tool vibration in feed direction. In this paper, a simulation technique to visualize the surface profile generated on the cutting process with LFV was developed. By visualizing the surface shape and contour shape, it is possible to clarify its features and calculate the surface roughness and roundness. During LFV operation, unlike conventional turning with constant feed rate, a cutting edge moves on the machined surface while vibrating in feed direction; hence characteristic patterns are formed by the uncut portion corresponding to the crossing cutter marks depending on the vibration conditions. The influence of such characteristic patterns on the surface roughness and the contour profile was clarified in detail. In addition, the vibration condition which can minimize roundness of the machined object was identified by using the developed simulation. Then the contour profile of the machined parts during LFV operation could be controlled.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130323815","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}
Pub Date : 1900-01-01DOI: 10.1299/transjsme.22-00099
Fumihiko Hakoda
{"title":"Model Construction Based on Real-Time System Identification Method (Proposal of a Model Construction Method for Anomaly Detection of Control Systems)","authors":"Fumihiko Hakoda","doi":"10.1299/transjsme.22-00099","DOIUrl":"https://doi.org/10.1299/transjsme.22-00099","url":null,"abstract":"","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130543417","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}
Pub Date : 1900-01-01DOI: 10.1299/transjsme.21-00156
T. Nakagaki, Tomohiro Suzuki, Tatsuyuki Amago, T. Kakiuchi, Y. Uematsu, Koushirou Kitayama, H. Kawabata
To investigate the effect of continuous casting direction and extrusive direction on fatigue strength of Al-Si eutectic alloys which have fine eutectic Si, tension-compression fatigue tests which have been developed to evaluate fatigue properties of extruded bars by small size specimen, and rotational bending fatigue tests were carried out. The results show that the fatigue strength of the extruded bar with homogenizing distribution of eutectic Si and another metallic compound is higher than that of continuous casting bar. The specific fatigue strength, which is defined as the fatigue limit, σ w , normalized by tensile strength, σ B , is 0.44 for the specimen sampled in the longitudinal direction of extrusion, that is higher than powder metallurgy aluminum. The fatigue fracture mode of continuous casted bar is shear type caused by the dendrite morphology which has inhomogeneous distribution of eutectic Si and another metallic compound, and the fatigue strength depends on the direction of continuous casting. In case of extruded bars, caused by homogenized distribution of eutectic Si and another metallic compound, the fatigue fracture is tensile type and the fatigue strength dependence on the direction of extrusion is smaller than in case of continuous casted bars. The developed fatigue test method using small size specimen which has 7mm length is able to evaluate the fatigue properties vertical to the extrusive direction using high strength extruded bar with small diameter.
{"title":"Influences of continuous casting and extruding direction on fatigue strength of Al-Si eutectic alloy","authors":"T. Nakagaki, Tomohiro Suzuki, Tatsuyuki Amago, T. Kakiuchi, Y. Uematsu, Koushirou Kitayama, H. Kawabata","doi":"10.1299/transjsme.21-00156","DOIUrl":"https://doi.org/10.1299/transjsme.21-00156","url":null,"abstract":"To investigate the effect of continuous casting direction and extrusive direction on fatigue strength of Al-Si eutectic alloys which have fine eutectic Si, tension-compression fatigue tests which have been developed to evaluate fatigue properties of extruded bars by small size specimen, and rotational bending fatigue tests were carried out. The results show that the fatigue strength of the extruded bar with homogenizing distribution of eutectic Si and another metallic compound is higher than that of continuous casting bar. The specific fatigue strength, which is defined as the fatigue limit, σ w , normalized by tensile strength, σ B , is 0.44 for the specimen sampled in the longitudinal direction of extrusion, that is higher than powder metallurgy aluminum. The fatigue fracture mode of continuous casted bar is shear type caused by the dendrite morphology which has inhomogeneous distribution of eutectic Si and another metallic compound, and the fatigue strength depends on the direction of continuous casting. In case of extruded bars, caused by homogenized distribution of eutectic Si and another metallic compound, the fatigue fracture is tensile type and the fatigue strength dependence on the direction of extrusion is smaller than in case of continuous casted bars. The developed fatigue test method using small size specimen which has 7mm length is able to evaluate the fatigue properties vertical to the extrusive direction using high strength extruded bar with small diameter.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126924549","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}
Pub Date : 1900-01-01DOI: 10.1299/transjsme.19-00328
Hirose Tomohiro, Keiichi Watanabe, Sato Yasumoto, T. Kitayama, Suhara Katsuhiro, Yuuto Chokushi, Suzuki Tetsuya, Kato Takehiko
One of the most important stages in automatic visual inspection for specular surface objects is to generate an image data including features of defects for the inspection. We define the image for inspection as an image data including an intensity change due to surface defects. The type of surface defects on the specular object is classified into local reflectivity losses and local unevennesses. In this paper, we report a study on illuminating, imaging and image processing methods to generate the image for inspection in order to detect the local unevennesses. We considered a situation where a light emitting source displays a sinusoidal intensity pattern and a camera captures the reflection pattern on the specular surface. Numerical computations based on our theoretical analysis shows that the local unevennesses appears as phase gaps of the sinusoidal intensity pattern in the image data captured by the camera. We propose a processing method to convert the phase gaps into the intensity changes in the image for inspection. In addition, we mentioned operational problems to be solved when we apply our methods to an automatic visual inspection system. Furthermore, we discussed a possible method for detecting the local unevennesses with a depth of 1x10-3 mm from the image for inspection.
{"title":"Theoretical analysis on imaging technique of local unevennesses occurred on specular surface objects","authors":"Hirose Tomohiro, Keiichi Watanabe, Sato Yasumoto, T. Kitayama, Suhara Katsuhiro, Yuuto Chokushi, Suzuki Tetsuya, Kato Takehiko","doi":"10.1299/transjsme.19-00328","DOIUrl":"https://doi.org/10.1299/transjsme.19-00328","url":null,"abstract":"One of the most important stages in automatic visual inspection for specular surface objects is to generate an image data including features of defects for the inspection. We define the image for inspection as an image data including an intensity change due to surface defects. The type of surface defects on the specular object is classified into local reflectivity losses and local unevennesses. In this paper, we report a study on illuminating, imaging and image processing methods to generate the image for inspection in order to detect the local unevennesses. We considered a situation where a light emitting source displays a sinusoidal intensity pattern and a camera captures the reflection pattern on the specular surface. Numerical computations based on our theoretical analysis shows that the local unevennesses appears as phase gaps of the sinusoidal intensity pattern in the image data captured by the camera. We propose a processing method to convert the phase gaps into the intensity changes in the image for inspection. In addition, we mentioned operational problems to be solved when we apply our methods to an automatic visual inspection system. Furthermore, we discussed a possible method for detecting the local unevennesses with a depth of 1x10-3 mm from the image for inspection.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129115146","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}
Pub Date : 1900-01-01DOI: 10.1299/transjsme.19-00241
Takanori Chihara, J. Sakamoto
Improving space sufficiency of cabin is one of significant factor in enhancing the value of automobiles. However, experiment with actual automobile mock-up requires excessive time and cost. Our aim of this study was to investigate the feasibility of spaciousness evaluation of automobile cabin by using virtual reality (VR). Twelve students (6 males and 6 females) participated in this study. The participants evaluated the visual spaciousness of automobile CG models with different roof heights R (0, +50, and +100 mm) and windshield depth W (0, +100, and +200 mm). The views from driver seat in the VR space were provided, and the subjective space sufficiency was measured in a 7-point Likert scale. The result showed that the average space sufficiency increased with the increase of the roof height and windshield depth, whereas it was almost constant irrespective of the windshield depth when R = +100 mm. The effect of roof height was statistically significant, whereas that of windshield was not significant. The relationship between the probability of the subjective score and the two factors (i.e., roof height and windshield depth) was formulated by applying the ordered logistic regression to the measured data. In addition, the results of ordered logistic regression were compared with a previous study in which the space sufficiency was measured in real space using an actual automobile mock-up. The results of the ordered logistic regression of this study roughly agreed with the previous study.
{"title":"Effect of design changes of automobile cabin in the virtual reality space on visual spaciousness","authors":"Takanori Chihara, J. Sakamoto","doi":"10.1299/transjsme.19-00241","DOIUrl":"https://doi.org/10.1299/transjsme.19-00241","url":null,"abstract":"Improving space sufficiency of cabin is one of significant factor in enhancing the value of automobiles. However, experiment with actual automobile mock-up requires excessive time and cost. Our aim of this study was to investigate the feasibility of spaciousness evaluation of automobile cabin by using virtual reality (VR). Twelve students (6 males and 6 females) participated in this study. The participants evaluated the visual spaciousness of automobile CG models with different roof heights R (0, +50, and +100 mm) and windshield depth W (0, +100, and +200 mm). The views from driver seat in the VR space were provided, and the subjective space sufficiency was measured in a 7-point Likert scale. The result showed that the average space sufficiency increased with the increase of the roof height and windshield depth, whereas it was almost constant irrespective of the windshield depth when R = +100 mm. The effect of roof height was statistically significant, whereas that of windshield was not significant. The relationship between the probability of the subjective score and the two factors (i.e., roof height and windshield depth) was formulated by applying the ordered logistic regression to the measured data. In addition, the results of ordered logistic regression were compared with a previous study in which the space sufficiency was measured in real space using an actual automobile mock-up. The results of the ordered logistic regression of this study roughly agreed with the previous study.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129212788","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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