Evaluation of outer hair cell function and medial olivocochlear efferent system in patients with type II diabetes mellitus

Abstract

The aim of this study is to control the residual vibrations of a clamped-free beam subjected to a moving load. The dynamic response of the beam is calculated by using the finite element method in order to design a suitable control technique and the numerical results are verified by vibration measurements. All the numerical calculations are performed by a commercial finite element package. Two laser displacement sensors are used to measure the dynamic response of the beam. The moving load is obtained by pressured air directed to the beam via a nozzle, and the movement of the load is achieved by an industrial robot manipulator having 6 degrees of freedom. In this study, the suppression of the residual vibrations that occur after the moving load has left the beam is considered as the main subject. Piezoelectric actuators are used for active vibration control study and displacement feedback is employed. The numerical results agree well with the experimental results. The results show that the finite element method can be used effectively for designing a suitable vibration control strategy.

Características audiológicas de pacientes com diabetes mellitus Tipo 2

“…The same study also showed decreased amplitude of DPOAE and TEOAE, as well as damage to the efferent system. Other studies, involving diabetic patients with up to 70 years of age, also found reduced amplitude inTEOAE and DPOAE 2,15 .…”

“…There was no association of age with the absence of responses in the OAE. Some studies involving individuals with older age, observed the relation of DM with the hearing loss 14,18,23 and with the absence of OAE 2 , while others found no association 15,24 .…”

“…Others have not showed a predominance of tonal thresholds 25 . Karabulut et al 15 , analyzing the OAE, also did not pointed out the difference between the sides. Frisina et al 30 , when realized the DPOAE, right commitment was found, Cabrer 28 to the left.…”

“…Some studies point out the loss attributed to the DM as the sensorioneural bilateral type, affecting mainly high frequencies 9,12,13,15,25,28 ; others have found worse thresholds at low frequencies 30 , low and medium-sized 14 or low and high 2 ; and some refer to predominant 14 flat configuration. As for the degree, most research concerns take hearing loss on the DM 12,13,18,25,28 .…”

“…Some studies indicate sensorioneural hearing loss at high frequencies 12,13 , while others have found low and medium frequencies deficit 14 . Studies involving the analysis of the OAE are also diverging to findings, while some showed reduction of amplitude of responses in diabetic patients 2,15 ; others found no significant difference between the groups with DM and the control 16 .…”