In this paper, a new-style isolator system in ship is solve this problem, a new-style ship isolator composed of MR presented, which is composed of wire rope and MR damper in damper and steer wire spring in parallel is designed. parallel. By taking advantages of the high damping and damping variability of MR damper, it is possible to make the mechanics II. EXPENRIMENTAL PLAN characteristics of isolator controllable and then solve the problem of vibration reduction in low frequency and impact resistance in In this paper, the ship isolator is designed to study the high frequency of ship equipment. In the researches on the impact vibration reduction and impact resistance[ , it makes sense to resistance and vibration reduction performances, numerical practical application of isolator .o solve this problem, a new experiment ad pship isolator composed of traditional vibration absorber and e power component in parallel is presented as shown in Figl, of results indicate that the new isolator has a good active controllable which the dynamic characteristics can be controllable[3], so that effect on the vibration and impact, especially for controlling it will improve the vibration reduction effect in wide frequency resonance and low-frequency vibration of system. range in this paper, the ship isolator is composed of steer wire Keywords-intelligent material; MR damper; vibration springs and MR dampers in parallel. reduction; impact resistance I.
Hydrodynamic noise is one of the main sound source of underwater vehicle. Flow noise and flow-excited noise are important part of hydrodynamic noise. In this paper, large eddy simulation is applied to simulate the flow field around a cone-column combined structure to obtain dipole sound source and turbulence fluctuating pressure. The surface pressure distribution is validated by experiment measured data. Structure dynamic response can be obtained by solving fluid-structure coupling equation. The flow noise and flow-excited noise of the structure are calculated according to acoustic analogy theory. From the numerical result, it can be seen the spectra characteristic of flow-excited noise is different from flow noise. The flow-excited noise obviously increases when system resonance occurs.
In this paper, by using the fast response, controllable isolator system. In this paper, a series of characteristics curves damp, small consume, wide dynamic scope, great adaptation of of MR damper are obtained through the vibration experiment the MR damper, a new isolator composed of steel rope spring and on isolator system. According to the experimental results, the MR damper is designed and a study on the low-frequency relations of damping force and its influencing factors are mechanics characteristics of MR damper in isolator is carried out, analyzed and some useful conclusions are obtained, which is then the relations between MR damping force and other factors very significant to practical application of MR damper on ship.are analyzed with experimental data, it shows that damping force not only has something to do with structural dimension, but also is related to controllable current and vibration frequency. Finally, II. EXPENRIMENTAL PLAN the experiential formula of damping force is corrected and the In this paper, the ship isolator is designed to study the relations between corrected coefficients and factors are obtained. mechanical characteristics of MR damper, it makes sense to practical application of isolator .To solve this problem, a new Keywords-ship isolator; maganeto fi dship isolator composed of traditional vibration absorber and low-frequency; mechanical characteristics power component in parallel is presented as shown in Figl, of which the dynamic characteristics can be controllable, so that it
A new isolator composed of a steel rope spring and a magneto-rheological (MR) damper was designed and a study on low-frequency mechanical characteristics of MR dampers in isolators was carried out. It used the characteristics of the MR damper, such as fast response, controllable damping, small energy consumption, wide dynamic scope, and great adaptation. The relationships between MR damping forces and influencing factors were analyzed based on experimental data. The results show that damping force is not only related to structural dimensions, but also closely related to controllable current and vibration frequency. Finally, the empirical formula for damping forces was corrected, and the relationship between correction coefficients and factors analyzed.
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