- Email: [email protected]
9538834 Torsional rigidity of semi-closed section member
84
Abstracts/JSAE
Review 17 (1996) 83-99
Torsional Rigidity of Semi-Closed Section Member Ken Kirioka, Masayuki Toya, Masao Aritomi (Kagoshima University), Minom Yokoyama (Kagoshima University Graduate School), Takaaki Fujimoto (Hinodesuido) It is know that Wagner’s torsion bending theory gives unxasonably large torsional rigidity values when applied to a short beam subjected to constrained warping conditions. Modification of Wagner’s theory was previously performed by taking into account the deformation induced by secondary shear stress. This theory is applied to semi-closed section members which a constructed from two facing hat-type section members by spot-welding one to the other at the facing flanges. The experimental results are shown to agree well with those based on this theory.
9538834
9538843 Dynamically Bending Strength Performance of Steel Sheet Beams Takao Mori (Toyama Prefectural University), Hidemitsu Hamano, Koji Suzuki (NKK Corporation) A testing method by dropping a weight on test beams was developed in order to obtain dynamically bending strength performance of bumper beams. The load-deflection curves of straight beams, which were made of high tensile strength steel sheet, were measured using this testing method. It was found that the dynamically bending strength performance is not different from the statically bending strength performance for steel sheet beams below the impact speed of 2.2 m/set. The developed testing method is effective for measuring the dynamic strength of bumper beams. 9538852 Evaluation of Nonlinearity in Vibration Analysis for Thin Walled Structures with Curvature (1st Report) Takao Yamaguchi, Shuji Matumura (Subaru Research Center Co. Ltd.), Ken-ichi Nagai (Gumma University) It is of practical importance to use a linearized theory in the vibration of thin walled sIructures, where response amplitudes are regarded as small. However, nonlinear vibration occurs when the strucmres are excited with comparatively large excitation. In this report, differences of vibration phenomena are discussed between the linear analysis and the nonlinear analysis due to geometric nonlinearity. In the typical example, we deal with a partial differential equation of a beam with curvature. The problem is reduced to a set of coupled nonlinear ordinary equations in a multi-degrees of freedom system. Superharmonic resonance, subharmonic resonance and chaotic vibration of the beam are also observed. 9538861 Study on the Load-Stress Simulation Method for Vehicle Structure Hisayuki Ishizu, Yusuke Kondo, Hiroji Iwasa (Mitsubishi Motors Corporation) This paper reports on analytical studies of the dynamic stress generated on the vehicle structure. The dynamic loads applied to a vehicle are calculated by using a dynamic simulation model, and the stresses for each load are calculated by using a finite element analysis constructed by an inertia relief analysis model. The superposition procedure with dynamic loads and finite element information is used to calculate the dynamic stress. These methods are applied to stress analysis of the vehicle body panel. The results show sufficient validity and practicality of this method in simulation of dynamic stress generated in a vehicle structure. 9538870 Research on Elementary Techniques to CalculaL Crashworthiness in the Structural Components - Part 2: Study on the Improvement of Accuracy of Time Integration Schemes - Yoshihiro Yamamoto (Honda R&D Co., Ltd.) On the computational study of crashworthiness in the vehicle structural components, it is pointed out that the conventional technique of explicit time integration, which has been employed in commercial crash codes, generates inaccurate results even on simple transient benchmark problems. A new type of time integration scheme which is an extended explicit type, including the element stiffness matrix, is proposed. Accuracies of the proposed time integration scheme are confirmed on the benchmark experiments and quasi-static crush experiments of simplified front midrails.
9538889 Development of the Total Management System for Distributed CAE Nobuyuki Wada, ItaruFujiwara (Hino Motors, Ltd.) Recently the CAE environment has been shifting gradually to distributed computing and, at the same time, CAE usage is spreadmg rapidly to mechanical designers as CAE is getting easier lo use. This has led to additional responsibilities for the designer, such as the maintenance of computer systems. The management of CAE data has also burdened the designer. We have developed a system that removes these burdens and frees and guides the designer to do the standard CAE tasks. By using this system, the designer is able to concentrate on the real task of designing. 9538898 Improved Fuel Consumption for an Automatic Transmission Using a Driven Power Control System with Powertrain Model Toshimichi Minowa, Hiroshi Kimura, Naoyuki Ozaki, Masahiko Ibamoto (Hitachi, Ltd.) A total control system using a powertrain model is investigated for an automotive automatic transmission in order to enhance drivability and improve fuel economy. The system provides efficient control for both the engine and transmission, which leads to better fuel consumption and acceleration feeling by optimizing shift timing and throttle valve opening. The new driven power control method using the total control system is described. A test vehicle equipped with an electronically controlled throttle valve is developed and the effectiveness of the proposed control method is verified. 9538906 Transient Control of Gear Shift by Means of Estimated Torque Feedback without Turbine Speed Sensor - Part 3: Reducing Method of Shift Shock Based on Estimating Drive Torque - Masahiko Ibamoto, Makoto Uchida, Hiroshi Kuroiwa, Toshimichi Minowa (Hitachi, Ltd.), Kazuhiko Sato (Hitachi Car Engineering Co.) Engine torque reduction is well known as a method of decreasing torque fluctuation during gear shift. We are developing a reducing method of shift shock by feedback control of drive torque using torque estimating technology without a torque sensor. It’s main purpose is to make a tuning free system eliminating data tables. In this paper a torque estimating method suitable for a car without a turbine speed sensor is described. 953I3915 Study of Fuel Consumption Improvement of Dry Hybrid Belt CVT Toshitaka Tsuji, Masaki Takeoka (Aichi Machine Industry Co., Ltd.) The fuel consumption of the dry hybrid belt CVT has been proven superior to a manual transmission (MT), by reducing transmission loss using a transmission ratio control system which employs an electronically controlled DC motor, and optimizing the transmission radio control. This paper reports on the analysis of transmission loss and this transmission ratio control method. 9538924 Simulation of a Paw1 and Gear Parking System for an Automatic Transmission Time Response Analysis of a Paw1 and Gear Parking System Kiyoshi Kudo (Aichi Machine Industry Co., Ltd.), Yoshihiro Wakabayashi (ESTECH Corp.) The meshing behaviour of a paw1 and gear parking mechanism in an automatic transmission was succesfully reproduced using ADAMS. The time domain kinetic forces and displacements of the mechanism, after the parking gear was engaged at a certain initial vehicle velocity, were calculated. This anaylsis achieved visualization of the meshing of a paw1 and gear parking mechanism and can be considered a valuable tool for use in the design process of a parking system. 9538933 Effect of Temperature Dependency of Lock-up Clutch Friction Characteristics on Shudder Vibration Narihiko Yoshimura (Tonen Corporation) A theoretical analysis of shudder vibration in a lock-up clutch, taking temperature increase on the friction surface into consideration, was established
Abstracts/JSAE
Review 17 (1996) 83-99
Torsional Rigidity of Semi-Closed Section Member Ken Kirioka, Masayuki Toya, Masao Aritomi (Kagoshima University), Minom Yokoyama (Kagoshima University Graduate School), Takaaki Fujimoto (Hinodesuido) It is know that Wagner’s torsion bending theory gives unxasonably large torsional rigidity values when applied to a short beam subjected to constrained warping conditions. Modification of Wagner’s theory was previously performed by taking into account the deformation induced by secondary shear stress. This theory is applied to semi-closed section members which a constructed from two facing hat-type section members by spot-welding one to the other at the facing flanges. The experimental results are shown to agree well with those based on this theory.
9538834
9538843 Dynamically Bending Strength Performance of Steel Sheet Beams Takao Mori (Toyama Prefectural University), Hidemitsu Hamano, Koji Suzuki (NKK Corporation) A testing method by dropping a weight on test beams was developed in order to obtain dynamically bending strength performance of bumper beams. The load-deflection curves of straight beams, which were made of high tensile strength steel sheet, were measured using this testing method. It was found that the dynamically bending strength performance is not different from the statically bending strength performance for steel sheet beams below the impact speed of 2.2 m/set. The developed testing method is effective for measuring the dynamic strength of bumper beams. 9538852 Evaluation of Nonlinearity in Vibration Analysis for Thin Walled Structures with Curvature (1st Report) Takao Yamaguchi, Shuji Matumura (Subaru Research Center Co. Ltd.), Ken-ichi Nagai (Gumma University) It is of practical importance to use a linearized theory in the vibration of thin walled sIructures, where response amplitudes are regarded as small. However, nonlinear vibration occurs when the strucmres are excited with comparatively large excitation. In this report, differences of vibration phenomena are discussed between the linear analysis and the nonlinear analysis due to geometric nonlinearity. In the typical example, we deal with a partial differential equation of a beam with curvature. The problem is reduced to a set of coupled nonlinear ordinary equations in a multi-degrees of freedom system. Superharmonic resonance, subharmonic resonance and chaotic vibration of the beam are also observed. 9538861 Study on the Load-Stress Simulation Method for Vehicle Structure Hisayuki Ishizu, Yusuke Kondo, Hiroji Iwasa (Mitsubishi Motors Corporation) This paper reports on analytical studies of the dynamic stress generated on the vehicle structure. The dynamic loads applied to a vehicle are calculated by using a dynamic simulation model, and the stresses for each load are calculated by using a finite element analysis constructed by an inertia relief analysis model. The superposition procedure with dynamic loads and finite element information is used to calculate the dynamic stress. These methods are applied to stress analysis of the vehicle body panel. The results show sufficient validity and practicality of this method in simulation of dynamic stress generated in a vehicle structure. 9538870 Research on Elementary Techniques to CalculaL Crashworthiness in the Structural Components - Part 2: Study on the Improvement of Accuracy of Time Integration Schemes - Yoshihiro Yamamoto (Honda R&D Co., Ltd.) On the computational study of crashworthiness in the vehicle structural components, it is pointed out that the conventional technique of explicit time integration, which has been employed in commercial crash codes, generates inaccurate results even on simple transient benchmark problems. A new type of time integration scheme which is an extended explicit type, including the element stiffness matrix, is proposed. Accuracies of the proposed time integration scheme are confirmed on the benchmark experiments and quasi-static crush experiments of simplified front midrails.
9538889 Development of the Total Management System for Distributed CAE Nobuyuki Wada, ItaruFujiwara (Hino Motors, Ltd.) Recently the CAE environment has been shifting gradually to distributed computing and, at the same time, CAE usage is spreadmg rapidly to mechanical designers as CAE is getting easier lo use. This has led to additional responsibilities for the designer, such as the maintenance of computer systems. The management of CAE data has also burdened the designer. We have developed a system that removes these burdens and frees and guides the designer to do the standard CAE tasks. By using this system, the designer is able to concentrate on the real task of designing. 9538898 Improved Fuel Consumption for an Automatic Transmission Using a Driven Power Control System with Powertrain Model Toshimichi Minowa, Hiroshi Kimura, Naoyuki Ozaki, Masahiko Ibamoto (Hitachi, Ltd.) A total control system using a powertrain model is investigated for an automotive automatic transmission in order to enhance drivability and improve fuel economy. The system provides efficient control for both the engine and transmission, which leads to better fuel consumption and acceleration feeling by optimizing shift timing and throttle valve opening. The new driven power control method using the total control system is described. A test vehicle equipped with an electronically controlled throttle valve is developed and the effectiveness of the proposed control method is verified. 9538906 Transient Control of Gear Shift by Means of Estimated Torque Feedback without Turbine Speed Sensor - Part 3: Reducing Method of Shift Shock Based on Estimating Drive Torque - Masahiko Ibamoto, Makoto Uchida, Hiroshi Kuroiwa, Toshimichi Minowa (Hitachi, Ltd.), Kazuhiko Sato (Hitachi Car Engineering Co.) Engine torque reduction is well known as a method of decreasing torque fluctuation during gear shift. We are developing a reducing method of shift shock by feedback control of drive torque using torque estimating technology without a torque sensor. It’s main purpose is to make a tuning free system eliminating data tables. In this paper a torque estimating method suitable for a car without a turbine speed sensor is described. 953I3915 Study of Fuel Consumption Improvement of Dry Hybrid Belt CVT Toshitaka Tsuji, Masaki Takeoka (Aichi Machine Industry Co., Ltd.) The fuel consumption of the dry hybrid belt CVT has been proven superior to a manual transmission (MT), by reducing transmission loss using a transmission ratio control system which employs an electronically controlled DC motor, and optimizing the transmission radio control. This paper reports on the analysis of transmission loss and this transmission ratio control method. 9538924 Simulation of a Paw1 and Gear Parking System for an Automatic Transmission Time Response Analysis of a Paw1 and Gear Parking System Kiyoshi Kudo (Aichi Machine Industry Co., Ltd.), Yoshihiro Wakabayashi (ESTECH Corp.) The meshing behaviour of a paw1 and gear parking mechanism in an automatic transmission was succesfully reproduced using ADAMS. The time domain kinetic forces and displacements of the mechanism, after the parking gear was engaged at a certain initial vehicle velocity, were calculated. This anaylsis achieved visualization of the meshing of a paw1 and gear parking mechanism and can be considered a valuable tool for use in the design process of a parking system. 9538933 Effect of Temperature Dependency of Lock-up Clutch Friction Characteristics on Shudder Vibration Narihiko Yoshimura (Tonen Corporation) A theoretical analysis of shudder vibration in a lock-up clutch, taking temperature increase on the friction surface into consideration, was established