Vibration analysis of a novel magnetic-viscous nonlinear passive isolator via finite element simulation

Abstract

In this paper, the design and the finite element simulation of a novel magnetic-viscous vibration isolator have been presented. The proposed isolator consists of permanent magnets axially aligned in repulsion position and a viscous damper in parallel with them. The nonlinear spring characteristic of the permanent magnets provides a good damping property with this configuration. Explicit finite element analyses have been conducted to examine the dynamic behavior of the isolator. Output displacements and transmissibility ratios were measured for various magnet configurations, dashpot coefficients, and input displacement excitation frequencies to determine the best damping properties. The results of the finite element modeling revealed that the performance of the isolator is highly sensitive to the quantity of magnets. Isolators with four or more magnets can successfully reduce the output displacement. The results indicate that the isolator significantly reduces the displacement transmissibility in frequencies over the resonant frequency region. It is possible to ensure an infinite operating life for magnet-viscous vibration isolators by protecting the magnets against breakage.

Design and analysis of a d33 mode piezoelectric energy generator for vehicle braking system

“…Following the method in [29], the magnetic repulsion F rpl between two cylindrical magnets as a function of their separation gap can be written as: where x is the separation gap between the two magnets during the braking process, we assume x to be 1 mm; r and t are the radius and thickness of cylindrical magnet, respectively; B 0 is the flux density in tesla (T), B 0 is between 1 to 1.5 for Neodymium and B 0 is 1.45 for N52 grade neodymium magnet which will be used for our study [30]; µ 0 is the permeability of space, which equals 4π × 10 −7 Tm A −1 . However, for small values of x, the result from equation ( 2) becomes inaccurate and large [31]. Most of the theoretical magnetic repulsion calculation models are simplified with different assumptions and the results often fail to match with experimentally measured data.…”

Archives of Control Sciences

“…The actuator failure is the main drawback in automotive field and it can be solved by fuzzy fault tolerant control technique [23]. Vibration isolator is discussed to minimise vibration in mass spring and damper system [24]. The cuckoo search optimisation [25] and Fuzzy PID technique [26] is addressed to enhance the ride comfort and stability of the Semi ASS.…”