A parallel Newmark-β algorithm for dynamic differential equations based on GPU has been proposed, whose reliability and acceleration performance has been varified with a cantilever beam. The results show that when the degree of freedom of model reaches 20000, the calculation speed of the algorithm is 12.99 times that of Newmark-β algorithm based on CPU, and shows a good trend with the increase of the degree of freedom. Furthermore, the proposed algorithm has been used to solve the dynamic differential equation of the rocket sled system, the result shows that despite the frequent data transmission between CPU and GPU in the solution of nonlinear time-varying differential equations, the algorithm proposed can still reduce the calculation time by 62%.

Ultra-compact mobility has been proposed as a new means of transportation in consideration of short-distance travel and environmental considerations in tourist destinations and urban areas. Since these vehicles are small and lightweight, it is expected that the ride quality will be uncomfortable due to vibration and the driver's discomfort will increase. Therefore, our research group proposes to improve the ride quality by mounting the active seat suspension on the seat. In this study, we conducted a basic study on ride comfort estimation considering the psychological state.

Noncontact magnetic levitation conveyance of thin steel plates using the attractive force of electromagnets has been proposed. In this study, magnetic levitation experiments were conducted on steel plates using the optimum arrangement of permanent magnets for each condition obtained by the genetic algorithm, and the stability of levitation was experimentally investigated. The results confirmed that the levitation performance of the steel plates was different for each gap and distance between horizontal electromagnets.

This study is being conducted to construct an active steering wheel system that provides an appropriate steering reaction torque for each driver. We conducted load experiments and confirmed that the results were consistent with the amount of steering burden, and found that the steering burden can be evaluated quantitatively.

During the hypersonic flight of the vehicle, the intense aerodynamic heating causes the temperature within the shock layer to rise sharply. Complex physicochemical reactions occur in the gas mixture accompanied by excitation of species in different energy modes, forming a plasma ionized flow. Applying a magnetic field to the flow can push the shock wave away from the body, producing good thermal protection and some reduction in resistance. However, the effect of the Lorentz force causes more additional drag, which makes the drag environment harsher. To achieve better heat shield and minimal drag growth of magnetohydrodynamics (MHD) flow control, researches on the drag and heat characteristics under a uniform and dipole magnetic field are carried out for several typical geometrical bodies. We obtained the influence of body’s shapes and magnetic field layouts on the aerodynamic characteristics of vehicles, which can help us to extend the application of MHD flow control.

To isolate low frequency vibration, this study proposed a magnetic high-static-low-dynamic

stiffness vibration isolator (MHSLDs-VI), which is composed of a spiral flexure spring (SFS) and

a magnetic negative stiffness spring (MNSS) based on variable reluctance stress. Theoretical study

and simulation of the MNSS stiffness-displacement relationship shows that an approximate linear

high negative stiffness is generated under small working air gap by employing the variable

reluctance stress. Comparing with existing single mover configuration, the negative stiffness of the

proposed double mover configuration increase two times. Besides, the optimization of the location

of the non-working air gap effectively improves the negative stiffness density. The axial positive

stiffness of SFS is analyzed by finite element method (FEM) and then the MHSLDs-VI is designed.

The dynamic model of the proposed isolator is established and the derived transmissibility

demonstrates that the isolation band is expanded towards low frequency. Therefore, the proposed

MHSLDs-VI can isolate low frequency vibration with high load-capacity and small size.

In production lines for thin steel sheets, which are often used in industrial products, contact conveyance by rollers is used. However, quality deterioration due to contact has become a problem. Therefore, non-contact magnetic levitation conveyance of thin steel sheets using the attractive force of electromagnets has been proposed. In this report, the effect of horizontal electromagnets on levitation performance is experimentally investigated.

One of the problems with ultra-compact vehicle is the resultant ride quality by vibrations in the vertical and pitch directions. Therefore, active seat suspension system using voice coil motor was proposed. Active seat suspension is mounted under the seat and directly suppresses vibrations transmitted to the occupant. In this report, the vibration suppression effect of using a voice coil motor was investigated.

Design a novel High-Static-Low-Dynamic Stiffness (HSLDS) magnetic spring consisting of permanent magnet and electromagnetic coil. Establishes the mathematical model and dynamic model of magnetic spring stiffness. Without adjusting the structural parameters, the initial vibration isolation frequency and peak transmissibility can be reduced by changing the magnitude and direction of current in the coil, thereby broaden the effective vibration isolation frequency band.

In this paper, a new permanent magnetic levitation system is proposed, which achieves stable levitation by controlling the magnetic force generated by the rotation of two permanent magnetic sticks acting on the iron ball below. We firstly design the structure and dimensions of this magnetic levitation system. Secondly, we determine the optimal rotation angle of the two permanent magnet sticks when the iron ball is in different positions. Finally, the control system of the magnetic levitation system is designed by using LQR (Linear Quadratic Regulator) control method. The simulation results show that the magnetic levitation system has good dynamic performance and can effectively realize the stable levitation of the iron ball.

In this paper, we proposed a novel piezoelectric damper which is designed for multi-mode vibration control of mechanical structures. This damper is composed of three butterfly-shaped energy converters, in which the piezoelectric stacks are embedded. Each energy converter is connected with a shunt circuit. For realizing the multi-mode vibration control of mechanical systems, these circuits’ electric resonant frequencies should be tuned to the structure’s targeted modal frequencies in one-to-one correspondence. To validate the proposed damper, the numerical simulation is carried out. In the presented numerical example, the damper is placed at three quarters of a hinged-hinged beam, and a point force with sweep sinusoidal frequency is applied at one quarter of that beam. Simulation results show that the proposed damper can significantly suppress the targeted modal vibrations.

As a fundamental study to improve the cornering performance of a yaw moment control system that assists the self-spinning motion of a competition vehicle, a quasi-static analysis of a vehicle subjected to electric motor drive torque and brake torque using an actuator was conducted. As a result of the analysis, the vehicle cornering performance with and without the system was evaluated, and the torque of the electric motor and the force of the actuator were calculated to satisfy the requirements for the amount of yaw moment change due to the system.

Deterioration of surface quality of steel plates due to conveyance by rollers has been a problem. As a solution, a technology for non-contact gripping and conveyance using electromagnetic force has been proposed. In this study, as a consideration of electromagnet units in magnetic levitation systems, the characteristics of magnetic field was investigated when the electromagnets are tilted.