Papers by Keyword: Damping Force

Abstract: Although aircraft carriers operating in the seas have developed considerably from a constructive point of view, naval aviation continues to face significant challenges due to short runways, often in motion or unpredictable weather conditions, as a rule. This paper aims to analyze the concept of aircraft's rapid deceleration to landing, as well as to study the dynamic behavior of the aircraft restraint system used by aircraft carriers.

Abstract: This paper presents the characteristics of damping force and energy regeneration of a pendulum. The damping force analysis includes force-displacement and force velocity loops when the pendulum, attached in a cart, is subjected with sinusoidal displacement input. The energy regeneration analysis includes the voltage, the current and the power generated by a generator. The main objectives of this paper are to obtain the mathematical models and to characterize both force and energy regeneration based on the inputs. The results show that the amplitudes and the frequencies at low level are most likely basic damper behavior. Moreover, the energy regeneration increases as well as the amplitude and the frequency.

Abstract: Magnetorheological (MR) damper is one of the most advanced application of semi active devices. Its use is increasing day by day due to its huge advantages and wide range of application. The force delivered by MR damper can be varied by changing the viscosity of its internal MR fluids. Till now no details experimental analysis has been accomplished by considering various parameters. In this paper a brief experimental analysis has been investigated with the help of Universal Testing Machine to characterize MR damper. To characterize accurately MR damper has been analyzed experimentally for different stroke length, stroke rate, stroke mode. From the experimental results it is seen that the force delivered by MR damper has a proportional relation with input excitation current, stroke length and stroke rate.

Abstract: This paper presents a comparative study of the damping force and energy absorbtion capacity of a typical conventional-viscous and a regenerative shock absorber for vehicle suspension. Regenerative shock absorber (RSA) is a shock absorber which can regenerate the dissipated vibration energy from vehicle suspension into electricity. In this research, a prototype of regenerative shock absorber was developed, its damping force and energy absorbtion capacity were tested, and the results were analized and compared with those of a typical conventional-viscous shock absorber. The regenerative and viscous shock absorber were compressed and extended in various excitation frequency using damping force testing equipment to obtain force-velocity and the force-displacement curves. The force-velocity and force-displacement curves indicate the damping force and energy absorbtion capacity of the shock absorber. The results show that the damping force of the typical-viscous shock absorber closed to linear at all exciation frequencies. For regenerative shock absorber, nonlinearity and large hysteresis area of the damping force occur at all excitation frequencies. Further, the energy absorbtion capacity of the typical-viscous shock absorber shows an elliptical area with the compression part bigger than the extension one, while those of the regenerative shock absorber shows an asymmetric square area, which indicates a smaller energy absorbtion capacity. These phenomena indicate the significant effect of implementing dry friction damper and elctrical damper to the characteristics of regenerative shock absorber.

Abstract: The traditional hydraulic shock absorber suspension converts the vibration energy between the sprung mass and unsprung mass into heat energy. The realization of vibration energy recycling can reduce vehicle's energy consumption, developing ideals for the research of the active suspension/ semi-active suspension. Four kinds of energy reclaiming suspension's structure principle is introduced in detail and the development restricting factors of the suspension at present are worked out through the unified measure, indicating the technology breakthrough points.

Abstract: Abst r a c t -Magneto rheological aqueous is an old advancing to the bazaar at top speed. Excellent appearance like fast response, simple interface amid electrical ability ascribe and automated ability output, and absolute controllability accomplish MRF technology adorable for abounding applications.The aim of this project is preparation of MR-fluids by using the different types of carrier fluid mixed with iron powder and stability and magnetic properties are analysed. Thesedimentation of iron particles can be reduced by using additives. The sedimentation can be analysed by boundary variation of the clear fluid to the fluid turbulence. The viscosity of smart fluid can be increased by varying the applied magnetic field.The performance of the MR-damper depends on the applied maximum magnetic field and the hydraulic circuit design. The MR-damper force by increasing the magnetic field can be analysed by sing the FEMM V4 Software.Damping force depends on the excitation of current and magnetic field.Key words: Rheological, magnetic field, damping force, FEMM, flux density

Abstract: This paper mainly introduces three types of hydraulic energy-dissipation dampers, which adopts the damping hole, relief valve, and relief throttle valve, and the structures, operation principles and energy dissipation mechanisms in detail. Using AMESim to analyze the performance parameters comparatively, it can be concluded that the hydraulic damper adopting relief valve has strong capability of energy consumption and effectively ensures the safety of engineering structures.

Abstract: Eddy currents induced in a conductor in a changing magnetic field produce a damping force proportional to the heat generated in the conductive material. In this paper, the damping force of short-stroke DC Linear Motor (DCLM) is researched, and then model of damping force is established. In the preliminary work, the analytical expression of magnetic field distribution is obtained by the charge model, so the eddy current inducted in the conductor is calculated. Then the damping force is obtained after the equivalent resistance and inductance of conductors are calculated. The formula of damping force is obtained to optimize damping structure of short-stroke DCLM. The accuracy of damping force model is proved by the experiment.

Abstract: The force transducer for dynamic calibration in absorber dynamometer is usually statically calibrated. To solve the problem, a new kind of dynamic calibration device and its working principle is discussed. Furthermore , the principle of its core member, linear damper, is particularly analyzed. Moreover dampers in different structures are discussed in depth and the production of its damping force is deduced. Thus, the theoretical premise of dynamic calibration device and linear damper is provided in this essay.

Abstract: In this paper, the damping force loci of a twin tube shock absorber were estimated by using the empirical data. The variation of the damping force was investigated for movements of piston such as the expansion. The relationship between the piston velocity and the damping force were estimated by using the empirical data of four different conditions of coil spring turns. Also the relationship between the coil spring turns and the damping force were estimated by using the empirical data of four different piston velocities. Based on the experiment results, the estimated damping force variation functions provide the physical information of the components of the main piston valve system to save the manufacturing time and cost for the shock absorber