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鄭, 惟 ; 長屋, 幸助 ; 岡, 三津夫
概要:
application/pdf<br />Journal Article<br />This paper presents an electromagnetic actuator consisting of rectangular permanent magnetic chips and a cylindrical coil, which is applicable to bending moment control of plates. The analytical
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expression for obtaining the control force against the control current is obtained based on the electromagnetic theory. A control method is presented for producing the required deflection of the plate by means of the bending-type electromagnetic actuator. Numerical calculations are carried out for some typical problems which will be of practical importance. It is clarified that the actuator and the method of control presented are valid for controlling plate shapes.
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| 2.
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長屋, 幸助 ; 杉浦, 光則
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application/pdf<br />Journal Article<br />Since electromagnetic force is a function of the gap between two magnets, the spring constant has large nonlinearities with respect to the displacement. Hence, the spring constant
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varies significantly with the initial load. This implies that the linear control theory is not applicable in the range of large displacement. To treat a system with variable initial load and large displacement, the present article presents a procedure for obtaining a linear spring by means of a repulsive-type actuator using permanent magnets and an electromagnet. The analytical expression for the linear spring is presented. Experimental tests were carried out, and the theoretical values are compared with the experimental results.
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長屋, 幸助 ; 平田, 康夫 ; 鶴見, 豊明 ; 武田, 定彦 ; 永井, 健一 ; 谷藤, 克也
概要:
application/pdf<br />Journal Article<br />Stresses in elliptical-cross-section coil springs become small as compared to other springs used in practical machines at a certain aspect ratio. This article presents a simplified stress
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expression for designing the elliptical-cross section coil springs. The stresses obtained by the present design formula are compared with those obtained by numerical methods. It is ascertained that the present formula is applicable to design the elliptical-cross section-coil springs.
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長屋, 幸助 ; 武田, 定彦 ; 佐藤, 淳 ; 井開, 重男 ; 関口, 肇 ; 斉藤, 登
概要:
application/pdf<br />Journal Article<br />This paper proposes a thrust bearing lubricated by a magnetic fluid under a magnetic field. The critical pressures of the bearing versus the magnitude of the magnetic flux densities have been
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investigated experimentally. It is clarified that the critical pressures of the proposed bearing are larger than those of the normal lubricant bearing under high speeds.
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長屋, 幸助 ; 大沼, 浩身 ; 佐藤, 淳
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application/pdf<br />Journal Article<br />This paper discusses effects of viscous pumping in a magnetic fluid seal under a rotating load. The Reynolds equation was presented for the seal based on magnetic fluid mechanics, and the
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expressions for obtaining pressures in the seal, eccentricities of the rotating shaft due to the viscous pumping and seal pressures were given. Numerical Calculations were carried out for some sample problems, and the effect of magnetic flux densities on the pressure in the seal and the seal pressures were clarified.
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永井, 健一 ; 長屋, 幸助 ; 武田, 定彦 ; 中村, 欣明
概要:
application/pdf<br />Journal Article<br />Analytical results are presented for nonlinear vibrations of a stretched string connected with a laterally movable end mass at one end. Applying the modified Galerkin method to the basic
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equations, a set of ordinary differential equations with cubic nonlinearity is obtained. The steady-state response is determined by the harmonic balance method. Numerical calculations are carried out for the various values for the end mass to the string and the geometry of the string. It is found that if the mass of the end mass increases to greater than that of the string, the resonant response in the first mode of vibration can be treated as a linear vibration up to a sufficiently large amplitude. However, the resonant curves in the higher mode of vibration show responses with a strong nonlinearity within a small amplitude. The increment of the cross section area of the string also gives a strong nonlinearity to the response in every mode of vibration.
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長屋, 幸助 ; 中田, 雅之 ; 増尾, 芳幸 ; 井開, 重男
概要:
application/pdf<br />Journal Article<br />This study proposes a new type of electromagnetic multiple disk brake for controlling the friction torque of the brake by using a rare earth magnet which generates very strong magnetic fields.
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This brake consists of a rare earth permanent magnet, an electric magnet and multiple friction disks. In this system, a control device such as a microcomputer generates an electric current in a coil of the electric magnet, and controls the friction torque of the brake. In the analysis the design formulae for the brake is first derived, based on the theory of electro-magnetic fields and the theory of tribology, then the transient friction torque is derived using the theories of Dynamics of Machinery and Automatic Control. To verify the present system and the analytical method, experimental tests have been performed for a model of the above-mentioned brake.
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長屋, 幸助 ; 中田, 貴隆 ; 武田, 定彦
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application/pdf<br />Journal Article<br />This paper deals with a method for solving dynamic stress problems of a non-cylindrical viscoelastic coil spring subjected to base excitations. The analysis considers the effects of ends of the
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coil, and applies the three dimensional curved beam theory for obtaining the exact solution of the element of the coil. The resultant forces and the resultant moments in the vibrant coil are decided by means of the transfer matrix method for an arbitrary shape. Both the shear and the normal stresses are obtained by use of the curved beam theory as just mentioned. Numerical calculations have been carried out for two cases of a barrel spring and a hyperboloidal spring.
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| 9.
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長屋, 幸助 ; 小島, 宏行 ; 岩田, 浩明 ; 伊藤, 美津夫 ; 太田, 幸一
概要:
application/pdf<br />Journal Article<br />磁気ダンパとサーボモータを用いた,コンピュータによるパルス信号制御の開ループ位置決め系を提示し,この系の妥当性を検討した.解析では軸振動の影響を考慮し,ばね
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と連続体についての両結果を誘導して両者の比較検討を行い,通常の制御速度でのばね系による解析の妥当性を明らかにした.また軸を剛体とした場合の結果を示して軸振動の影響を検討した.さらに軸の強度設計の観点から,軸のねじりモーメントを与える式をも示した.
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| 10.
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長屋, 幸助
概要:
application/pdf<br />Journal Article<br />This paper presents the theoretical results of the stresses in a coil spring of arbitrary cross section. The analysis consists of two parts one of which is concerned with the displacements,
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the angles of rotation, the resultant forces and the resultant moments which occur in a helical spring during the loading. The results in this problem are derived by application of the curved beam theory in which all displacements and all forces in three orthogonal directions of the coil spring are included with consideration of constraints of the edges of the spring. At the second step, the paper presents the expressions for stresses in the spring due to the compression in the direction of the axis of the cylindrical spring when both edges are kept to be parallel during the deformation by use of the author's results given in the preceding paper (1st report). Numerical calculations have been carried out for four cases of a circular cross-section spring, an elliptical cross section spring, a rectangular cross section spring and an oval section spring.
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