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Influence of Rolling Friction in Linear Ball Guideways on Positioning Accuracy
Tanaka, Toshiharu,Ikeda, Kyohei,Otsuka, Jiro,Masuda, Ikuro,Oiwa, Takaaki Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.2
Linear ball guideways have been used recently in precision or ultra-precision positioning devices. However, when the inner balls begin to roll or the moving direction reverses, these guideways are subject to rolling friction or nonlinear spring behavior. An ultra-precision device with a linear motor, referred to as a 'tunnel actuator' (TA), has been constructed to measure these phenomena. The application of a TA is beneficial for two reasons: it mostly cancels the attractive magnetic force between the stator and mover (armature), and its magnetic flux leakage is very low. The influence of the nonlinear spring behavior in ball guideways was investigated in this study using the pure driving force from a TA. The equilibrium between the driving force from the TA and the nonlinear spring force provided great accuracy for a positioning stage using a linear ball guideway.
Toshiharu Tanaka,Takaaki Oiwa,Akira Kotani 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.11
A gear is used not only for power transmission but also in precision positioning. A conventional and general gear has only one degree of freedom motion. Therefore, the case of its use is limited. In this paper, we propose and manufacture an innovative spherical gear. The proposed spherical gear has a multiple degrees of freedom motion. Compared with other spherical gear, the proposed spherical gear does not have complex shape. Moreover, the handle of the proposed spherical gear is similar to that of a spur gear. The experimental apparatus using the spherical gear pair measures a transmission efficiency and an angular backlash between the gears. According to experimental results, the spherical gear teeth could mesh firmly and transmit power at any shaft angle. In addition, the maximum transmission efficiency and the angular backlash become about 87.1% and 16.9 mrad when the shaft angle is 0°, respectively.
Influence of Rolling Friction in Linear Ball Guideways on Positioning Accuracy
Toshiharu Tanaka,Kyohei Ikeda,Jiro Otsuka,Ikuro Masuda,Takaaki Oiwa 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.2
Linear ball guideways have been used recently in precision or ultra-precision positioning devices. However, when the inner balls begin to roll or the moving direction reverses, these guideways are subject to rolling friction or nonlinear spring behavior. An ultra-precision device with a linear motor, referred to as a 'tunnel actuator' (TA), has been constructed to measure these phenomena. The application of a TA is beneficial for two reasons: it mostly cancels the attractive magnetic force between the stator and mover (armature), and its magnetic flux leakage is very low. The influence of the nonlinear spring behavior in ball guideways was investigated in this study using the pure driving force from a TA. The equilibrium between the driving force from the TA and the nonlinear spring force provided great accur acy for a positioning stage using a linear ball guideway.
일본 하치노헤시(八戶市)유아의 체격과 운동능력에 관한 종단적 연구
三島隆章(Takaaki Mishima),岩千步(Chiho Iwadate),田中望(Nozomi Tanaka),김준동(Jun Dong Kim) 한국발육발달학회 2009 한국발육발달학회지 Vol.17 No.4
In a survey of the motor ability of young children in the city of Hachinohe, the motor ability of 60 children in a nursery school associated with Hachinohe Junior College was measured over two years. In addition, to compare the findings with national surveys, the results of 604 children enrolled at this nursery school in the 2007 and 2008 school years were classified by age at the time the measurements were made, and totaled. It was found that boys had significantly lower scores for timed body support, long jump, and softball throw than the results of the national test. For girls a difference with the national survey was seen in timed body support only. These results suggest that among young children in Hachinohe, boys have lower instantaneous strength, muscle endurance, and throwing strength, and girls have lower muscle endurance, compared with the national average.
( Toshikazu Tanaka ),( Yoshihito Suda ),( Tomoyuki Kamenaga ),( Akira Saito ),( Takaaki Fujishiro ),( Koji Okamoto ),( Takafumi Hiranaka ) 대한슬관절학회 2022 대한슬관절학회지 Vol.34 No.-
Background: This study aims to assess the influence of intramedullary rods on the implantation positions of femoral components using Microplasty instrumentation in Oxford unicompartmental knee arthroplasty. We hypothesized that femoral components can be laterally implanted incorrectly when using intramedullary rods. Methods: This prospective study included all 45 consecutive patients (53 knees) who underwent Oxford unicompartmental knee arthroplasty surgery for anteromedial osteoarthritis or spontaneous osteonecrosis of the knee at our hospital during the study period. A custom-made toolset comprising a triangular caliper and circular trial bearings was used to evaluate the distance between the bearing and the vertical wall of the tibia implant (wall-bearing space) using the caliper at 90° flexion both with and without intramedullary rods. Results: The wall-bearing space was significantly larger when the intramedullary rod was used than when intramedullary rod was not used (1.8 ± 1.1 mm versus 3.4 ± 1.2 mm, P < 0.001). The mean difference of wall-bearing space with and without intramedullary rod was 1.6 ± 0.7 mm. Conclusions: Femoral components can be laterally implanted incorrectly by an average of 1.6 mm when using intramedullary rods. The wall-bearing space should be evaluated using trial components, and if the relationship is improper, it should be corrected before keel slot preparation.
A Study on Ship Assignment Strategies of Shipping Companies Accounting for Shipper Time Value
Kenji Tanaka,Heng Wang,Takaaki Kawanaka,Jing Zhang 대한산업공학회 2020 Industrial Engineeering & Management Systems Vol.19 No.2
The three major shipping companies consolidated their liner business. However, the global share of the newly consol-idated company was a low 6.5%, making it only the 6th largest in the world. Thus, the Japanese shipping industry still remain in a disadvantageous position in terms of competing with more efficient large-scale shipping companies. Hence, Japanese shipping companies require a strategy not based upon price competition in order to survive. In this study, we propose a method for formulating vessel assignment plans accounting for inter-company competition. The flow of research is as follows: 1) Estimates time value accounting for shipper demand fluctuation risk, 2) Evaluates vessel assignment plans in terms of shipping company container transport volume and profit, 3) As an example, fo-cuses on a regional dominance strategy for Japanese shipping company vessel assignment, conducts a case study through simulation, and then evaluates it. From the simulation results, a regional dominance strategy based on the vessel assignment plan formulation method proposed in this study is thought to be superior in the long term as a strat-egy for The Alliance in Southeast Asia.
Atsuhito Kakuta,Takaaki Tanaka,Masaaki Chazono,Hirokazu Komaki,Seiichiro Kitasato,Naoya Inagaki,Shoshi Akiyama,Keishi Marumo 한국생체재료학회 2019 생체재료학회지 Vol.23 No.3
Background: It has been reported that the microporous structure of calcium phosphate (CaP) ceramics is important to osteoconduction. Bone morphogenetic protein-2 (BMP-2) has been shown to be a promising alternative to bone grafting and a therapeutic agent promoting bone regeneration when delivered locally. The aim of this study was to evaluate the effects of micro-porosity within beta-tricalcium phosphate (β-TCP) cylinders and local BMP-2 administration on β-TCP resorption and new bone formation. Methods: Bilateral cylindrical bone defects were created in rabbit distal femora, and the defects were filled with β-TCP. Rabbits were divided into 3 groups; defects were filled with a β-TCP cylinder with a total of approximately 60% porosity (Group A: 13.4% micro- and 46.9% macropore, Group B: 38.5% micro- and 20.3% macropore, Group C: the same micro- and macro-porosity as in group B supplemented with BMP-2). Rabbits were sacrificed 4, 8, 12, and 24 weeks postoperatively. Results: The number of TRAP-positive cells and new bone formation in group B were significantly greater than those in group A at every period. The amount of residual β-TCP in group C was less than that in group B at all time periods, resulting in significantly more new bone formation in group C at 8 and 12 weeks. The number of TRAPpositive cells in group C was maximum at 4 weeks. Conclusions: These results suggest that the amount of submicron microporous structure and local BMP-2 administration accelerated both osteoclastic resorption of β-TCP and new bone formation, probably through a coupling-like phenomenon between resorption and new bone formation.
A Modified Under-Vastus Approach for Knee Arthroplasty with Anatomical Repair of Soft Tissue
Takafumi Hiranaka,Toshikazu Tanaka,Takaaki Fujishiro,Kensuke Anjiki,Naosuke Nagata,Daiya Kitazawa,Ken Kotoura,Koji Okamoto 대한정형외과학회 2019 Clinics in Orthopedic Surgery Vol.11 No.4
The under-vastus approach (UVA) is a modification of the conventional subvastus approach for knee arthroplasty. Our modified UVA allows the muscles to be spared while offering good exposure of the operative field and facilitating anatomical repair of the capsule and fascia. A medial parapatellar incision is made and the vastus medialis fascia is incised along the same line. The muscle belly is not incised but detached from the surrounding fascia and retracted laterally. The suprapatellar pouch capsule is then laterally incised under the vastus muscles. The patella can then be easily retracted laterally and adequate exposure is possible. After the procedure, both capsule and fascia can be anatomically repaired. We use this approach for all primary arthroplasties in our practice. There has been no case in which an additional muscle incision was required, and there were no intraoperative complications. The modified UVA allows for excellent exposure of the operative field as well as muscle retention in both primary total and unicompartmental knee arthroplasties.