A new type of semi-active hydraulic engine mount using controllable area of inertia track

Experimental study of hydraulic engine mounts using multiple inertia tracks and orifices: Narrow and broad band tuning concepts

“…However, using the o n,num , o n,den , z num , and z den parameters of the X r ¼ 0.3 mm case in place of the X r ¼ 1.0 mm case shows good agreement in predicting o n,num , o n,den , z num , and z den for designs D2 and D3 when using Eq. (13). For this reason, it is suspected that o j K n ,max for design 1, X r ¼ 1.0 mm, may be incorrect on the basis of tuning predictions being otherwise consistent.…”

“…Note that since all published results [1][2][3][4][5][6][7][8][9][10][11][12][13] focus on narrow-tuned devices, it is difficult to validate the accuracy of broad-tuned K n 22 ðjoÞ spectra with prior formulations. Nonetheless the K n 22 ðjoÞ expression is developed in the same manner as the linear models formulated by Singh et al [1] for n ¼ 1.…”

“…For instance, capillary-type inertia track geometries of d i ¼ 4-6 mm and l i ¼ 10-25 cm are typical for narrow-tuned devices [1][2][3][4][5][6][7][8][9][10][11][12][13]. For this reason, it is not very difficult to design a narrow-tuned device given the ability to change d i and/or l i of a single capillary tube-type track.…”

Quantification of Active Structural Path for Vibration Reduction Control of Plate Structure under Sinusoidal Excitation

“…To express the equation of motion in a simple matrix form, the mass, stiffness, forces, and displacement vector are defined in Equations (10)- (14). M = diag( m s m r m st1 m st2 m st3 I s,y I r,y I s,x I r,x ) (10)…”

“…Wu et al [13] developed a vibration insulator using a magnetic spring with negative stiffness (MS-NS) with high-static-low-dynamic stiffness characteristics and showed that it can reduce the natural frequency of vibration. Truong [14] proposed a new type of hydraulic engine mount capable of inertial track control. Mathematical modeling was performed, and the simulation showed that the resonance peak and resonance frequency were changed through the optimal tuning of the inertia track region.…”