I. Matsuya, R. Katamura, M. Iba, Hideaki Kondo, K. Kanekawa, T. Hatada, Y. Nitta, T. Tanii, Shoji Shuichi, A. Nishitani, I. Ohdomari
We have developed a novel relative-story displacement sensor for structural health monitoring which is capable of measuring the 5-DOF movement of building layers. Three pairs of infrared-light emitting diode arrays and position sensitive detector units were used for simultaneously measuring the relative displacement, the local inclination angle, and the torsion angle between two adjacent layers. For verification, laboratory tests were carried out using a shaking table, a motorized micrometer, and a rotation stage. In the static experiment, it is verified that the local inclination angle and the torsion angle can be measured as well as the relative-story displacement using the sensor system. The resolution of the sensor system in the displacement measurement, that in the inclination angle measurement, and that in the torsion angle measurement were evaluated to be 0.10 mm, 34.4 μrad, and 14.6 μrad, respectively. In the dynamic response experiment, the accuracy of the sensor system was experimentally evaluated to be 0.20 mm in the relative-displacement measurement, 110 μrad in the inclination angle measurement, and 90 μrad in the torsion angle measurement, respectively. These results indicate that the developed sensor system has a sufficient accuracy for structural health monitoring.
{"title":"Development of 5-DOF relative-story displacement sensor for structural health monitoring","authors":"I. Matsuya, R. Katamura, M. Iba, Hideaki Kondo, K. Kanekawa, T. Hatada, Y. Nitta, T. Tanii, Shoji Shuichi, A. Nishitani, I. Ohdomari","doi":"10.1299/KIKAIC.78.1451","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1451","url":null,"abstract":"We have developed a novel relative-story displacement sensor for structural health monitoring which is capable of measuring the 5-DOF movement of building layers. Three pairs of infrared-light emitting diode arrays and position sensitive detector units were used for simultaneously measuring the relative displacement, the local inclination angle, and the torsion angle between two adjacent layers. For verification, laboratory tests were carried out using a shaking table, a motorized micrometer, and a rotation stage. In the static experiment, it is verified that the local inclination angle and the torsion angle can be measured as well as the relative-story displacement using the sensor system. The resolution of the sensor system in the displacement measurement, that in the inclination angle measurement, and that in the torsion angle measurement were evaluated to be 0.10 mm, 34.4 μrad, and 14.6 μrad, respectively. In the dynamic response experiment, the accuracy of the sensor system was experimentally evaluated to be 0.20 mm in the relative-displacement measurement, 110 μrad in the inclination angle measurement, and 90 μrad in the torsion angle measurement, respectively. These results indicate that the developed sensor system has a sufficient accuracy for structural health monitoring.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115831679","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}
Syunichi Kamura, Yosuke Koba, Koichi Matsuda, S. Kijimoto
Noise control has been developed to establish the comfortable soundscape even if our house life. Floor impact noise such as the sound of footsteps or falling object becomes a problem in an apartment house. Floor impact noise has a peak at the low-frequency range. Passive noise control is not effective against low-frequency noise. Therefore, the purpose of this paper is to control the impact noise using active noise control. Since each impact noise is generated in a short period, LMS algorithm is difficult to use because of its slow convergence characteristics. On the other hand, frequency domain adaptive algorithm is known for fast convergence characteristics. In this paper, the effectiveness of active noise control using frequency domain adaptive algorithm is confirmed through simulations and experiments.
{"title":"Active control against impact noise using frequency domain adaptive algorithm","authors":"Syunichi Kamura, Yosuke Koba, Koichi Matsuda, S. Kijimoto","doi":"10.1299/KIKAIC.78.1655","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1655","url":null,"abstract":"Noise control has been developed to establish the comfortable soundscape even if our house life. Floor impact noise such as the sound of footsteps or falling object becomes a problem in an apartment house. Floor impact noise has a peak at the low-frequency range. Passive noise control is not effective against low-frequency noise. Therefore, the purpose of this paper is to control the impact noise using active noise control. Since each impact noise is generated in a short period, LMS algorithm is difficult to use because of its slow convergence characteristics. On the other hand, frequency domain adaptive algorithm is known for fast convergence characteristics. In this paper, the effectiveness of active noise control using frequency domain adaptive algorithm is confirmed through simulations and experiments.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128170030","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}
Yusuke Orii, Syo Ishigaki, K. Tsugihashi, Kyoko Masuda, M. Saeki
The method of collision analysis between granular materials and a plate is investigated numerically and experimentally. The motions of granular materials and the plate are analyzed by using the discrete element method and the finite element method, respectively. The damping characteristics of the plate are given by the Rayleigh damping. The validity of the analysis method is examined by a comparison of the experimental results. In the experimental approach, the response of an aluminum thin plate was measured when some steel balls collided with it. The contact behavior of the plate is evaluated by the displacement response and the frequency response of the plate.
{"title":"Collision analysis between granular materials and elastic plate","authors":"Yusuke Orii, Syo Ishigaki, K. Tsugihashi, Kyoko Masuda, M. Saeki","doi":"10.1299/KIKAIC.78.1542","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1542","url":null,"abstract":"The method of collision analysis between granular materials and a plate is investigated numerically and experimentally. The motions of granular materials and the plate are analyzed by using the discrete element method and the finite element method, respectively. The damping characteristics of the plate are given by the Rayleigh damping. The validity of the analysis method is examined by a comparison of the experimental results. In the experimental approach, the response of an aluminum thin plate was measured when some steel balls collided with it. The contact behavior of the plate is evaluated by the displacement response and the frequency response of the plate.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132890506","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 presents control system design for occupant lower extremity protection in the event of a frontal car crash. A semi-active knee bolster is used to protect occupant lower extremities. The semi-active knee bolster varies the damping coefficient of the knee bolster. The control system design of the semi-active knee bolster is based on a design method of an active knee bolster. LQI (Linear Quadratic Integration) control with an initial value compensation input is applied. We obtain an optimal reference signal of the contact force between the knees and the instrument panel by considering characteristics of the semi-active actuator and the closed loop control system. The control system of the semi-active knee bolster follows the reference signal of the contact force. The protective control system with the semi-active knee bolster is effective for reducing the femur load, verified by carrying out simulations and experiments.
{"title":"Control system design for occupant lower extremity protection using semi-active knee bolster","authors":"T. Narukawa, H. Nishimura","doi":"10.1299/KIKAIC.78.1711","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1711","url":null,"abstract":"This paper presents control system design for occupant lower extremity protection in the event of a frontal car crash. A semi-active knee bolster is used to protect occupant lower extremities. The semi-active knee bolster varies the damping coefficient of the knee bolster. The control system design of the semi-active knee bolster is based on a design method of an active knee bolster. LQI (Linear Quadratic Integration) control with an initial value compensation input is applied. We obtain an optimal reference signal of the contact force between the knees and the instrument panel by considering characteristics of the semi-active actuator and the closed loop control system. The control system of the semi-active knee bolster follows the reference signal of the contact force. The protective control system with the semi-active knee bolster is effective for reducing the femur load, verified by carrying out simulations and experiments.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116801357","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 damping force of a magnetic damper is based on the Lorentz force. That is to say, the magnetic damping force is generated in the direction opposite to the relative motion of a conductor with respect to a magnet. Normally, a magnetic damper uses two conducting plates facing the opposite sides of a magnet. If only one side of the magnet is used, the magnetic damping force is less. In the present work, a new magnetic damper composed of Halbach magnet arrays arranged in three parallel lines is proposed. A basic Halbach magnet array consists of five magnet cubes that are glued in the specific directions relative to each other, and is characterized as having a strong magnetic field on one side and a weak field on the other. For this reason, it is possible to realize a high-performance magnetic damper using only one side of a magnet. The magnetic fields of the Halbach magnet arrays of the new magnetic damper we are proposing, together with other magnet arrays, were investigated analytically using Biot–Savart’s Law. Furthermore, the proposed magnetic damper was fabricated and tested. The experimental results were compared with the analytical results. As a result, the effectiveness of the new magnetic damper was confirmed.
{"title":"Study on magnetic damper composed of combined magnets (magnetic damper composed of basic halbach magnet arrays)","authors":"T. Kimura, Y. Takayama, T. Kondou, S. Kijimoto","doi":"10.1299/KIKAIC.78.1691","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1691","url":null,"abstract":"The damping force of a magnetic damper is based on the Lorentz force. That is to say, the magnetic damping force is generated in the direction opposite to the relative motion of a conductor with respect to a magnet. Normally, a magnetic damper uses two conducting plates facing the opposite sides of a magnet. If only one side of the magnet is used, the magnetic damping force is less. In the present work, a new magnetic damper composed of Halbach magnet arrays arranged in three parallel lines is proposed. A basic Halbach magnet array consists of five magnet cubes that are glued in the specific directions relative to each other, and is characterized as having a strong magnetic field on one side and a weak field on the other. For this reason, it is possible to realize a high-performance magnetic damper using only one side of a magnet. The magnetic fields of the Halbach magnet arrays of the new magnetic damper we are proposing, together with other magnet arrays, were investigated analytically using Biot–Savart’s Law. Furthermore, the proposed magnetic damper was fabricated and tested. The experimental results were compared with the analytical results. As a result, the effectiveness of the new magnetic damper was confirmed.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131037176","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}
Yoshiko Ohno, I. Ikeda, Yosuke Koba, Koichi Matsuda, S. Kijimoto
In three-dimension acoustic field, it is difficult to control in the whole room using active noise control (ANC) technique. Instead, around-head-control is investigated in this paper. By using around-head-control method, an object person can get the noise reduction effect without controlling in the whole space, because it makes around the head quiet locally. Therefore, to realize around-head-control, it is necessary for a controller to follow the head movement. However, there is a problem that the control effect under the movement is worse, and the recovery of control effect after movement is slow by conventional ANC. Against this problem, we propose the new method of improving the adaptation speed when an evaluation point moves. In the algorithm, the updating size appropriate to each coefficient of the adaptive filter is calculated by using a step size vector. The step size vector is calculated from the coefficient of adaptive filter before updating. The validity of the proposal method is shown by the numerical simulation and the experiment in an anechoic chamber.
{"title":"Active noise control for a moving evaluation point using stepsize vector","authors":"Yoshiko Ohno, I. Ikeda, Yosuke Koba, Koichi Matsuda, S. Kijimoto","doi":"10.1299/KIKAIC.78.1670","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1670","url":null,"abstract":"In three-dimension acoustic field, it is difficult to control in the whole room using active noise control (ANC) technique. Instead, around-head-control is investigated in this paper. By using around-head-control method, an object person can get the noise reduction effect without controlling in the whole space, because it makes around the head quiet locally. Therefore, to realize around-head-control, it is necessary for a controller to follow the head movement. However, there is a problem that the control effect under the movement is worse, and the recovery of control effect after movement is slow by conventional ANC. Against this problem, we propose the new method of improving the adaptation speed when an evaluation point moves. In the algorithm, the updating size appropriate to each coefficient of the adaptive filter is calculated by using a step size vector. The step size vector is calculated from the coefficient of adaptive filter before updating. The validity of the proposal method is shown by the numerical simulation and the experiment in an anechoic chamber.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"03 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131011739","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 nonlinear controller for accelerating a mobile inverted pendulum (MIP) with interconnection and damping assignment passivity-based control (IDA-PBC) is proposed. For underactuated systems, nonlinear partial differential equations (PDEs) must be solved to derive the IDA-PBC and it is a difficult task in general. However, this study shows that the MIP can be properly described as a full actuated port-Hamiltonian system focusing only on the pendulum dynamics. The controller is derived without solving the PDEs. Although our controller is for only the pendulum part of the system, the translational acceleration can be indirectly controlled utilizing the relation between the inclination of the pendulum and the acceleration arising from instability of the system. The controller can achieve various properties through energy shaping procedure of the IDA-PBC. Especially an energy function which will lead to safe operation of the MIP is proposed in this study. The function ensures that motion of the pendulum is restricted in a predefined region and converges to a desired pendulum angle. The controller also gets the pendulum back to the desired angle with a large state-dependent gain when the pendulum comes close to fall over. Effectiveness of the controller is verified through simulations.
{"title":"Energy Shaping Nonlinear Acceleration Control for a Mobile Inverted Pendulum Utilizing Instability","authors":"Kazuto Yokoyama, Masaki Takahashi","doi":"10.1299/KIKAIC.78.1097","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.1097","url":null,"abstract":"A nonlinear controller for accelerating a mobile inverted pendulum (MIP) with interconnection and damping assignment passivity-based control (IDA-PBC) is proposed. For underactuated systems, nonlinear partial differential equations (PDEs) must be solved to derive the IDA-PBC and it is a difficult task in general. However, this study shows that the MIP can be properly described as a full actuated port-Hamiltonian system focusing only on the pendulum dynamics. The controller is derived without solving the PDEs. Although our controller is for only the pendulum part of the system, the translational acceleration can be indirectly controlled utilizing the relation between the inclination of the pendulum and the acceleration arising from instability of the system. The controller can achieve various properties through energy shaping procedure of the IDA-PBC. Especially an energy function which will lead to safe operation of the MIP is proposed in this study. The function ensures that motion of the pendulum is restricted in a predefined region and converges to a desired pendulum angle. The controller also gets the pendulum back to the desired angle with a large state-dependent gain when the pendulum comes close to fall over. Effectiveness of the controller is verified through simulations.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128803052","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}
Kunito Okuyama, Satoshi Kamidozono, Jun Iyeshima, Shunske Kato, S. Mori
Oscillation behavior and heat transport characteristics in a pulsating heat pipe consisting of a single and straight tube with an open end are investigated experimentally. Periodic oscillation of a vapor plug with a large stroke over two thirds of the heat transport tube length is excited for heating powers larger than 20 W at horizontal orientation and continues for a long period over 8,000 s without cease. Heat transport rate and the effective thermal conductivity increase with heating power up to approximately 75 W and 40 kW/(m·K), respectively. Heating section, which has an inner diameter little larger than that of the heat transport section, is maintained at almost the saturation temperature of the working liquid throughout the succession of oscillation. Liquid film beneath the vapor plug is partially pushed back to the heating section to spread on the wick each time the vapor plug shrinks. The small step at the tube connection between the heating section and the heat transport tube section and the wick inside the heating section are shown to be essential structures for realizing the stable oscillation leading to high heat transport characteristics.
{"title":"Study of a single, straight tube pulsating heat pipe (oscillation behavior and heat transport characteristics)","authors":"Kunito Okuyama, Satoshi Kamidozono, Jun Iyeshima, Shunske Kato, S. Mori","doi":"10.1299/KIKAIB.78.881","DOIUrl":"https://doi.org/10.1299/KIKAIB.78.881","url":null,"abstract":"Oscillation behavior and heat transport characteristics in a pulsating heat pipe consisting of a single and straight tube with an open end are investigated experimentally. Periodic oscillation of a vapor plug with a large stroke over two thirds of the heat transport tube length is excited for heating powers larger than 20 W at horizontal orientation and continues for a long period over 8,000 s without cease. Heat transport rate and the effective thermal conductivity increase with heating power up to approximately 75 W and 40 kW/(m·K), respectively. Heating section, which has an inner diameter little larger than that of the heat transport section, is maintained at almost the saturation temperature of the working liquid throughout the succession of oscillation. Liquid film beneath the vapor plug is partially pushed back to the heating section to spread on the wick each time the vapor plug shrinks. The small step at the tube connection between the heating section and the heat transport tube section and the wick inside the heating section are shown to be essential structures for realizing the stable oscillation leading to high heat transport characteristics.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123879977","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 novel imaging technique combining Glare-Points technique (GPT) with interferometric laser imaging for droplet sizing (ILIDS) has been developed to measure droplet size, velocity and spatial distribution of mass flux in a spray. This technique enables to advance the droplet positioning error by ILIDS and expand the dynamic range of droplet sizing, because the large and small sized droplets were obtained by using GPT and ILIDS, respectively. The novel receiving optical system called as Double-planes Particle Imaging (DPI) was constructed in order to capture the focus plane (Glare-Points) and the defocus plane (interferometric fringe) with only one imaging sensor. Firstly, the captured image is processed for calculating of the droplet position, size and velocity by GPT and ILIDS, respectively. The droplet position by ILIDS is corrected by the mapping function which is obtained from the ray tracing simulation. Secondly, the same droplet image is matched with the aid of velocity information. In addition, the droplet position is defined as the one of GPT, the droplet size is employed the ILIDS' for smaller and the GPT's for larger than threshold value. Finally, the depthwise positions of droplet are estimated from the optical path difference between the focus and defocus images. From the result of validation experiment using a mono-disperse generator, the DPI enables to estimate the three-dimensional droplet position within the measurement error of 8.4% and expand the dynamic range of the accurate droplet sizing up to approximately 200 μm. Furthermore, this developed technique was applied to a spray flow, and the spatial distribution of mass flux was evaluated from the obtained droplet position, size and velocity information.
{"title":"焦点・非焦点画像併用による噴霧流中の液滴の粒径，速度および質量流束の空間分布測定","authors":"雄基 重田, 林田 健太郎, 満久 一柳, 公一 菱田","doi":"10.1299/KIKAIB.78.867","DOIUrl":"https://doi.org/10.1299/KIKAIB.78.867","url":null,"abstract":"The novel imaging technique combining Glare-Points technique (GPT) with interferometric laser imaging for droplet sizing (ILIDS) has been developed to measure droplet size, velocity and spatial distribution of mass flux in a spray. This technique enables to advance the droplet positioning error by ILIDS and expand the dynamic range of droplet sizing, because the large and small sized droplets were obtained by using GPT and ILIDS, respectively. The novel receiving optical system called as Double-planes Particle Imaging (DPI) was constructed in order to capture the focus plane (Glare-Points) and the defocus plane (interferometric fringe) with only one imaging sensor. Firstly, the captured image is processed for calculating of the droplet position, size and velocity by GPT and ILIDS, respectively. The droplet position by ILIDS is corrected by the mapping function which is obtained from the ray tracing simulation. Secondly, the same droplet image is matched with the aid of velocity information. In addition, the droplet position is defined as the one of GPT, the droplet size is employed the ILIDS' for smaller and the GPT's for larger than threshold value. Finally, the depthwise positions of droplet are estimated from the optical path difference between the focus and defocus images. From the result of validation experiment using a mono-disperse generator, the DPI enables to estimate the three-dimensional droplet position within the measurement error of 8.4% and expand the dynamic range of the accurate droplet sizing up to approximately 200 μm. Furthermore, this developed technique was applied to a spray flow, and the spatial distribution of mass flux was evaluated from the obtained droplet position, size and velocity information.","PeriodicalId":337733,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. C","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129708698","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}
Generally, rolling bearings are fixed at both ends of a rotating axis and a reference target is provided to give allowable fixing error of the bearings as appropriate according to the category and application. The allowable fixing error of a spindle, in which high rotational accuracy is required, should be very small. However, there is no research report which investigates closely the relationship between the fixing error and the rotational accuracy. Thus, eventually, this research intends to clarify the relationship between them and this report describes the relationship between the inclination error in bearing unit and the non-repetitive run-out using small ball rolling bearing. Consequently, using a measuring equipment of rotational error for single ball bearing, it was made known that the amplitude of the ball-cage rotation becomes very large when the inclination error increases. Thus, the conclusions of this research are as follows. (1) When the inclination error increases, the amplitude of frequency of cage rotation becomes large even supposing that the inclination error is in an allowable range. (2) When the inclination error increases, the amplitude of the doubled frequency of cage rotation becomes prominent. (3) When the number of rolling elements becomes large, the increment of variation of rotational period for the ball-cage is small.
{"title":"Influence of inclination error on non repetitive run-out of the single ball bearing","authors":"S. Noguchi, Yuta Sato, T. Nogi, T. Kanada","doi":"10.1299/KIKAIC.78.272","DOIUrl":"https://doi.org/10.1299/KIKAIC.78.272","url":null,"abstract":"Generally, rolling bearings are fixed at both ends of a rotating axis and a reference target is provided to give allowable fixing error of the bearings as appropriate according to the category and application. The allowable fixing error of a spindle, in which high rotational accuracy is required, should be very small. However, there is no research report which investigates closely the relationship between the fixing error and the rotational accuracy. Thus, eventually, this research intends to clarify the relationship between them and this report describes the relationship between the inclination error in bearing unit and the non-repetitive run-out using small ball rolling bearing. Consequently, using a measuring equipment of rotational error for single ball bearing, it was made known that the amplitude of the ball-cage rotation becomes very large when the inclination error increases. Thus, the conclusions of this research are as follows. (1) When the inclination error increases, the amplitude of frequency of cage rotation becomes large even supposing that the inclination error is in an allowable range. (2) When the inclination error increases, the amplitude of the doubled frequency of cage rotation becomes prominent. (3) When the number of rolling elements becomes large, the increment of variation of rotational period for the ball-cage is small.","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":"125615459","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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