Peak Amplitude Frequency Research Articles

Nonlinear dynamics of ionic liquid enhanced soft composite membrane under electro-mechanical loading

The incorporation of ionic liquids (ILs) into dielectric elastomer composites has attracted significant interest due to their potential applications in soft actuators and optical devices. Their soft and hyperelastic nature make them a distinct dynamic. In this paper, nonlinear dynamics of IL enhanced soft composite (ILESC) dielectric membrane subjected to electro-mechanical loading is investigated. A mixed micromechanical model with the incorporation of an electric double layer (EDL) and Maxwell-Wagner-Sillars (MWS) polarization is developed to estimate mechanical and electrical properties of the ILESC. Governing equations are derived via an energy method with the framework of the hyperelastic membrane theory, Neo-Hookean constitutive model and the couple dielectric theory. These equations are discretized by Taylor series expansion (TSE) and differential quadrature (DQ) methods and are solved by incremental harmonic balance (IHB) method combined with arc-length technique. The developed model and results are verified by comparing to experimental data and previous results. The influence of volume fraction, shape and size of IL fillers, static and dynamic applied electric field and excitation amplitude on forced vibration and resonant response of the ILESC membrane are comprehensively analyzed. It is found that ILESC membrane with slender ellipsoidal ILs displays larger amplitude, lower peak amplitude frequency and more obvious softening behavior.

Piezoelectric Wafer Active Sensor Transducers for Acoustic Emission Applications.

Piezoelectric materials are defined by their ability to display a charge across their surface in response to mechanical strain, making them great for use in sensing applications. Such applications include pressure sensors, medical devices, energy harvesting and structural health monitoring (SHM). SHM describes the process of using a systematic approach to identify damage in engineering infrastructure. A method of SHM that uses piezoelectric wafers connected directly to the structure has become increasingly popular. An investigation of a novel pitch-catch method of determining instrumentation quality of piezoelectric wafer active sensors (PWASs) used in SHM was conducted as well as an investigation into the effects of defects in piezoelectric sensors and sensor bonding on the sensor response. This pitch-catch method was able to verify defect-less instrumentation quality of pristinely bonded PWASs. Additionally, the pitch-catch method was compared with the electromechanical impedance method in determining defects in piezoelectric sensor instrumentation. Using the pitch-catch method, it was found that defective instrumentation resulted in decreasing amplitude of received and transmitted signals as well as changes in the frequency spectrums of the signals, such as the elimination of high frequency peaks in those with defects in the bonding layer and an increased amplitude of around 600 kHz for a broken PWAS. The electromechanical impedance method concluded that bonding layer defects increase the primary frequency peak's amplitude and cause a downward frequency shift in both the primary and secondary frequency peaks in the impedance spectrum, while a broken sensor has the primary peak amplitude reduced while shifting upward and nearly eliminating the secondary peak.

Analysis of the Territorial Vocalization of the Pheasants Phasianus colchicus.

The aim of the study was to assess the impact of the duration of the mating season and the time of day on the parameters of the vocalization pheasants (duration of vocalization, frequency of the sound wave, intervals between vocalizations). In the study, pheasant vocalization recorded in the morning (600-800) and in the afternoon (1600-1800) between April and June 2020 was analyzed. In total, the research material consisted of 258 separate vocalizations. After recognition of the individual songs of each bird, frequency-time indicators were collected from the samples to perform statistical analysis of the recorded sounds. The duration of the first syllable [s], the duration of the second syllable [s], the duration of the pause between the syllables [s], the intervals between successive vocalizations [min], and the peak frequency of the syllables I and II [Hz] were specified for each song. The duration of the syllables and the pauses between the syllables and vocalizations were determined through evaluation of spectrograms. The peak amplitude frequencies of the syllables were determined via time-frequency STFT analysis. Statistically significant differences in the distributions of the values of all variables between the analyzed months were demonstrated. The longest duration of total vocalization and the shortest time between vocalizations were recorded in May. Therefore, this month is characterized by the highest frequency and longest duration of vocalization, which is related to the peak of the reproductive period. The time of day was found to exert a significant effect on all variables except the duration of syllable II. The duration of vocalization was significantly shorter in the morning, which indicates that the cooks are more active at this time of day in the study area. The highest peak amplitude frequencies of both syllables were recorded in April, but they decreased in the subsequent months of observation. The time of day was also shown to have an impact on the peak amplitude frequencies, which had the highest values in the morning.

The effects of temperature and pH change on the snapping sound characteristic of Alpheus edwardsii

Aim: The current study undertook manipulative experiments to observe changes in snapping shrimp sound signals in relation to temperature and pH changes. Methodology: Sounds of intertidal snapping shrimp (Alpheus edwardsii) sequentially exposed to different temperature/pH treatments manipulation for a period of 2 week each, were recorded in the laboratory and analysed. The acoustic characteristics of snapping sound signal were examined to relate to the change in temperature, pH and combination of both parameters. Results: Our results showed that there was a significant reduction in the frequency of peak amplitude of snapping sound wave following a two week exposure to a combination of temperature and pH treatments. The frequency of snapping shrimp sound decreased by approximately 30% when exposed to a 2°C increase in temperature and a 0.7 unit decrease in pH, however, elevated temperature alone caused no significant effect on the peak frequency of snapping shrimp sound. Interpretation: The finding suggests that following the prediction values of temperature and pH changes due to climate change in the coming century may implicate the ambient noise at habitats where snapping shrimps dominate.

Signal time–frequency representation and decomposition using partial fractions

Summary The Z-transform of a complex time signal (or the analytic signal of a real signal) is equal to the Z-transform of a prediction error divided by the Z-transform of the prediction error operator. This inverse is decomposed into a sum of partial fractions, which are used to obtain impulse response operators formed by non-causal filters that complex-conjugate symmetric coefficients. The time components are obtained by convolving the filters with the original signal, and the peak frequencies, corresponding to the poles of the prediction error operator, are used for mapping the time components into frequency components. For non-stationary signals, this decomposition is done in sliding time windows, and the signal component values, in the middle of each window, are attributed to the peak value of its frequency response that corresponds to the pole of this partial fraction component. The result is an exact, but non-unique, time–frequency representation of the input signal. A sparse signal decomposition can be obtained by summing along the frequency axis in patches with similar characteristics in the time–frequency domain. The peak amplitude frequency of each new time component is obtained by computing a scalar prediction error operator in sliding time windows, resulting in a sparse time–frequency representation. In both cases, the result is a time–frequency matrix where an estimate of the frequency content of the input signal can be obtained by summation over the time variable. The performance of the new method is demonstrated with excellent results on a synthetic time signal, the LIGO gravitational wave signal and seismic field data.

Preliminary Experience With Inertial Movement Technology to Characterize Endotracheal Intubation Kinematics.

Endotracheal intubation (ETI) is an important emergency intervention. Only limited data describe ETI skill acquisition and often use bulky technology, not easily transitioned to the clinical setting. In this study, we used small, portable inertial detection technology to characterize intubation kinematic differences between experienced and novice intubators. We performed a prospective study including novice (<10 prior clinical ETI) and experienced (>100 clinical ETI) emergency providers. We tracked upper extremity motion with roll, pitch, and yaw using inertial measurement units (IMU) placed on the bilateral hands and wrists of the intubator. Subject performed 6 simulated emergency intubations on a mannequin. Using machine learning algorithms, we determined the motions that best discriminated experienced and novice providers. We included data on 12 novice and 5 experienced providers. Four machine learning algorithms (artificial neural network, support vector machine, decision tree, and K-nearest neighbor search) were applied. Artificial neural network had the greatest accuracy (95% confidence interval) for discriminating between novice and experienced providers (91.17%, 90.8%-91.5%) and was the most parsimonious of the tested algorithms. Using artificial neural network, information from 5 movement features (right hand, roll amplitude; right hand, pitch amplitude; right hand, yaw standard deviation; left hand, yaw standard deviation; left hand, pitch frequency of peak amplitude) was able discriminated experienced from novice providers. Novice and experienced providers have different ETI movement patterns and can be distinguished by 5 specific movements. Inertial detection technology can be used to characterize the kinematics of emergency airway management.

L1 and Gender Effects in Korean Learners' Production of English /s/

This study investigated the influence of L1 allophonic rule, L1 segment articulation, and gender in Korean learners'' production of English /s/ in two different contexts (i.e., before a high front vowel vs. elsewhere) and at three different proficiency levels in English (i.e., low vs. intermediate vs. high). The influence of the Korean allophonic rule realizing /s/ as [∫] before a high front vowel was not attested. The low and intermediate groups did not exhibit any significant difference between English /s/ before a high front vowel and English /s/ elsewhere regarding centroid frequency (CF). This result illustrates that the low and intermediate groups did not differentiate the articulation of English /s/ in the two contexts regarding its place of articulation. In addition, the high group illustrated a significantly higher CF for English /s/ before a high front vowel than for English /s/ elsewhere, illustrating that the high group pronounced English /s/ before a high front vowel in a more front region of a vocal tract. All the three groups of Korean learners showed significantly higher CF for English /s/ occurring in the context elsewhere in comparison to the native English group, and this may have been due to the influence of an alveo-dental or dental articulation of Korean /s/ (Lee, 1996; Sohn, 1996). Finally, gender effects were attested in the production of English /s/. Male Korean groups at three different proficiency levels in English showed significantly higher CF and PAF (Peak Amplitude Frequency) than the male native English group when pronouncing English /s/ while there was no significant difference among the female groups. It is required to examine whether an alveo-dental or dental articulation of Korean /s/ is more frequently observed in males'' speech than in females'' in order to say that the result of English /s/ in this study occurred due to the influence of the articulation of Korean /s/.

Effect of the radial support stiffness of the ring gear on the vibrations for a planetary gear system

Planter gear system is one of the critical components of various industrial transmission systems. In general, the ring gear is elastically fixed with the gearbox. The gearbox materials and their assembly relationships will affect the support stiffness of the ring gear and system vibrations. In this paper, a multi-body dynamic model for a planetary gear system with the elastic support of ring gear is developed to discuss the influence of the radial support stiffness of ring gear on the system vibrations. The planet bearings are also considered in the multi-body dynamic model. The rotational speed of the planet gear and carrier from the simulation and theoretical results are compared to validate the developed multi-body dynamic model. The influences of the radial support stiffness of the ring gear, carrier moment, and sun gear speed on the time- and frequency-domain vibrations of the planetary gear system are analyzed. The results denote that the waveform and amplitude of the time-domain vibration of the ring gear are greatly affected by the radial support stiffness of ring gear as well as the peak frequency amplitude and its sidebands. The peak frequency in the spectrum of ring gear is slightly affected by the radial support stiffness. It indicates that this study can give some guidance for the vibration control approaches for the planetary gear systems.

The Relation between Lexical Knowledge and L2 Production of English /z/-/ʒ/

This study examined Korean learners’ production of English /z/-/ʒ/ contrast. In doing so, the acoustic measurements such as centroid frequency (CF), peak amplitude frequency (PAF) and friction ratio of a target fricative within a word were compared between native English speakers and Korean learners at three different proficiency levels in English (i.e., low, intermediate and high). It was found that Korean learners exhibited different patterns regarding friction ratio of /z/ and /ʒ/ depending on their proficiency levels in English. In general, the low and intermediate groups illustrated significantly lower friction ratio than the high and native English groups. On the other hand, there were no significant differences of CF and PAF among the four groups, indicating that Korean learners were able to pronounce places of articulation of /z/ and /ʒ/ like native English speakers regardless of their proficiency levels. In addition, a significant relationship between Korean learners’ production of /z/-/ʒ/ and lexical knowledge was found in the high group’s production of /z/. CF and PAF of /z/ were higher for the tokens with no lexical knowledge than the ones with lexical knowledge, suggesting that the high group pronounced /z/ included in the tokens with no lexical knowledge in a more front region, possibly as the result of hyperarticulation. (Hannam University, University of Seoul)

The role of perceptual ability and lexical knowledge in L2 sound production

This study examined the relationship between L2 sound production and perceptual ability/lexical knowledge through the analysis of Korean learners’ production of English /s/ and /∫/ measured by friction ratio, Centroid Frequency (CF), and Peak Amplitude Frequency (PAF). It was found that Korean learners’ perceptual ability of the sounds were related to their production. Friction ratio for /s/ and /∫/ was significantly longer for the accurately perceived tokens than for the inaccurately perceived tokens. Korean learners’ production of /s/ and /∫/ was also related to Korean learners’ lexical knowledge of English tokens. Even when English tokens were perceived accurately by Korean learners, their production of /s/ and /∫/ showed different patterns depending on whether the tokens had accurate or inaccurate lexical knowledge. Finally, Korean learners’ production of English /s/ and /∫/ showed the influence of L1 phonology and proficiency level in English.

Ultrasonic monitoring of spontaneous imbibition experiments: Acoustic signature of fluid migration

AbstractCapillary rise experiments (spontaneous imbibition tests) were conducted in the laboratory with ultrasonic and X‐ray monitoring on the Sherwood sandstone and the Majella grainstone. The aim was to provide a direct comparison between the variation in seismic attributes (amplitude, velocity, spectral content, and energy) and the actual fluid distribution in the rock. Two pairs of ultrasonic P wave sensors located at different heights on a cylindrical rock specimen recorded every 5 s the waveforms when capillary forces make water rise up into the rock from the bottom in contact with a water tank. Simultaneously, computerized tomography scan images of a vertical cross section were also recorded. Two important results were found. (i) The amplitude of the first P wave arrival is impacted by the upward moving fluid front before the P wave velocity is, while the fluid front has not yet reached the sensors level. In contrast, the P wave velocity decreases when the fluid front reaches the Fresnel clearance zone. The spectral analysis of the waveforms shows that the peak frequency amplitude is continuously decreasing without noticeable frequency shift. (ii) A methodology based on the calculation of the analytical signal and instantaneous phase was designed to decompose each waveform into discrete wavelets associated with direct or reflected waves. The energy carried by the wavelets is very sensitive to the fluid substitution process: the coda wavelets related to reflections on the bottom end face of the specimen are impacted as soon as imbibition starts and can be used as a precursor for the arriving fluid.

Effect of oxygenated fuels on performance, combustion, emission and vibration characteristics of a compression ignition engine

ABSTRACTOxygenated fuels are set to replace fossil fuels, as they are biodegradable, renewable and have less impact on the environmental. Experiments have been carried out to find performance, combustion, emission and vibration characteristics of a single cylinder, four stroke, variable compression ratio, compression ignition engine. In this study, the fuels used are diesel, oxygenated fuels like neem methyl ester (NME), B1 (diesel 50%, neem methyl ester 45%, methanol 5%) and B2 (diesel 50%, neem methyl ester 40%, methanol 10%). Engine tests are conducted at the rated speed of 1500 rpm for different loading conditions at the fixed compression ratio of 17.5. At full load condition, brake thermal efficiency is higher by 24.74% for B2 over diesel. Maximum net heat release rate and maximum rate of pressure rise are higher for NME compared to blends B1 and B2. The smoke density of diesel–biodiesel–methanol blended fuel B1 is low compared to other fuels up to 50% load. At full load condition, vibration is reduced by 36.4, 50.7 and 40.4% for NME compared to diesel at first, second and third highest peak amplitude frequencies. Therefore, NME and diesel–biodiesel–methanol blended fuel B1 are recommended as alternate fuels for a compression ignition engine in view of reduced engine vibration and emissions.

SP 2. Pallidal low frequency activity correlates with dystonic symptoms in patients with cervical dystonia

Question Low frequency (4–12 Hz) oscillations in the internal pallidum (GPi) have been shown to be correlated and coherent with dystonic EMG activity and have therefore been proposed as a pathophysiological signature in patients with dystonia. The aim of this study was to investigate the potential association between pallidal 4–12 Hz activity and symptom severity as quantified by the Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS) in patients with cervical dystonia. Methods 27 patients undergoing functional neurosurgery for therapeutic deep brain stimulation targeting the GPi were included in our study. Pallidal local field potentials were recorded bilaterally at rest from adjacent contact pairs (01, 12, 23) of the externalized leads before implantation of the impulse generator. All time-series data were taken to the frequency domain using fourier transform based methods. Resulting power spectra were normalized and visually inspected for peaks in the low-frequency ( θ : 4–12 Hz) and beta band ( β : 13–30 Hz). Additionally, inter-hemispheric coherence as a measure of spatial oscillatory connectivity has been analysed. Spearman’s correlations have been conducted to investigate a potential association between coherence and peak amplitude and preoperative dystonic symptom severity (TWSTRS) for each frequency band. Results All patients had distinct peaks in the low frequency band (4–12 Hz, mean: 6.6 Hz ± 0.26 S.E.M.) and in the beta band (13–30 Hz, mean: 17 Hz ± 0.68 S.E.M.). Both, averaged low frequency peak amplitude across available contact pairs and averaged inter-hemispheric low frequency band coherence correlated significantly with the patients’ dystonic symptom severity, as measured by preoperative TWSTRS (N = 27, Spearman’s ρ = 0.39, P = 0.02 and Spearman’s ρ = 0.54, P = 0.002 for peak amplitude and coherence respectively) and the correlation got better when only the highest peak amplitude was chosen in each electrode (N = 27, Spearman’s ρ = 0.47, P = 0.006). None of the correlations were significant for the beta band peak amplitudes, nor the beta band coherence. Conclusions The results of our study suggest that pallidal low frequency oscillations have a functional role in the pathophysiology of dystonia and may be a biomarker for dystonic symptom severity, which could potentially be used for adaptive deep brain stimulation.

Female Attraction to Higher Pitched Male Enticement Calls in Barn Swallows

AbstractCurrent sexual selection studies demonstrate that female mate preference almost always favors exaggerated male traits, such as colorful plumage and elongated tails. However, such studies focused mainly on secondary sexual characteristics, i.e., traits that are fully developed at maturation, while ignoring others, which precludes generalization of the findings. We studied the expression of the male enticement call, a nestling‐like courtship trait, in relation to female attraction and to the expression of secondary sexual ornaments in the Japanese barn swallowHirundo rustica gutturalis. First, we showed that the peak amplitude frequency of male enticement calls was, on average, lower than that of nestling food‐begging calls, indicating that higher pitched calls are more similar to nestling food‐begging calls than are lower pitched calls. Second, we conducted an experimental playback of male enticement calls during the courtship period with the female's mate removed, and found that females were more attracted to heightened‐pitch calls than to control calls. Lastly, the peak amplitude frequency of male enticement calls was negatively related to the ornamentation, as measured by throat coloration. Taken together, these findings suggest the following: (1) females are attracted to a more nestling‐like trait, and (2) similarity to nestling food‐begging calls increases with decreasing secondary sexual ornaments. Nestling‐like male traits that are not secondary sexual characteristics should be considered when studying the general pattern of female attraction to male traits.

Response shaping using a subordinate oscillator array

Recent research has shown that arrays of small dynamic elements attached to a master structure can be tuned to significantly alter the time or frequency response of the system. Colloquially known as “fuzzy structures,” subordinate oscillators have led to applications including damping, radio frequency filtering, energy harvesting, and micro electro-mechanical system (MEMS) chemical vapor sensing. A passive machinery damping system will be designed and tested for silencing properties. The current subordinate oscillator array (SOA) design consists of a plate of sheet metal with arrays of cantilevers machined of similar but different lengths. These cantilevers will have a range of natural frequencies, which correspond to a desired frequency suppression range. When the SOA is mounted to a vibration source, it functions as an acoustic meta-material which traps and dissipates energy. This is accomplished by synchronizing the phase and frequency of the cantilevers with machinery peak amplitude frequencies. By designing cantilevers properly, the SOA acts as a mechanical broadband filter as opposed to a notch filter. The SOA will be tested primarily for vibration suppression performance but also for sensitivity to tolerance and energy storage density.

Electromyographic evaluation of approach stride, jump stride and intermediate stride in selected superficial muscles of the jumping horse: a preliminary study

The horse's ability to execute the diverse physical demands of jumping is greatly influenced by muscular adaptations to training. The aim of the study was to provide preliminary insight into potential differences in the functional activity of muscles recruited during phases of the equine jumping effort. An exploratory case study was conducted to investigate muscle activity and recruitment in one jumping horse, experienced in 1.40 m competition. Wireless sEMG electrodes were utilised to quantitatively investigate the degree of muscle activation by recording potentials from the Superficial gluteal (SG), Triceps brachii (TB) and Longissimus dorsi muscles. Data were collected as the horse executed a related combination of fences with a maximum height of 1.25 m. Mean motor unit action potential (mMUAP) and mean peak amplitude frequency (PAF) were determined for each muscle during approach, jump and intermediate strides, and were analysed using Friedman and Wilcoxon Signed Rank tests to establish whether significant differences occurred between strides. Statistical analyses did not reveal significant differences between mMUAP values for muscles investigated across strides (P≯0.05). However, significant differences were found for mean PAF values in the left SG between approach and jump strides (P&lt;0.025), and between jump and intermediate strides (P&lt;0.025) in the left TB. The lack of significant differences between strides may reflect the theory that the jump stride is a form of extended suspension incorporated into the canter stride and may support current anecdotal training methods of the jumping horse, which place emphasis on developing a regular and collected canter. However, results from this study were based on one horse and therefore application to the wider population of jumping horses should be undertaken with caution until further research in more subjects is conducted to support the results from this preliminary study.

The detection threshold for extremely low frequency magnetic fields may be below 1000 nT‐Hz in mice

Previous experiments with mice have shown that a repeated 1 h daily exposure to an ambient magnetic field shielded environment induces analgesia (anti-nociception). This shielding reduces ambient static and extremely low frequency magnetic fields (ELF-MF) by approximately 100 times for frequencies below 120 Hz. To determine the threshold of ELF-MF amplitude that would attenuate or abolish this effect, 30 and 120 Hz magnetic fields were introduced into the shielded environment at peak amplitudes of 25, 50, 100 and 500 nT. At 30 Hz, peak amplitudes of 50, 100, and 500 nT attenuated this effect in proportion to the amplitude magnitude. At 120 Hz, significant attenuation was observed at all amplitudes. Exposures at 10, 60, 100, and 240 Hz with peak amplitudes of 500, 300, 500, and 300 nT, respectively, also attenuated the induced analgesia. No exposure abolished this effect except perhaps at 120 Hz, 500 nT. If the peak amplitude frequency product was kept constant at 6000 nT-Hz for frequencies of 12.5, 25, 50, and 100 Hz, the extent of attenuation was constant, indicating that the detection mechanism is dependent on the nT-Hz product. A plot of effect versus the induced current metric nT-Hz suggests a threshold of ELF-MF detection in mice at or below 1000 nT-Hz.

Discrimination of False-Positive Events Transmitted via Optivol Fluid Status Monitoring Using an Analysis of Rising Pattern of Optivol Fluid Index

OptiVol fluid status monitoring measures intrathoracic impedance and OptiVol Fluid Index (OVFI) provides an early warning of thoracic fluid retention. We evaluated the predictive value of these data as early warning of exacerbation of heart failure (HF). 82 consecutive patients with structural heart disease treated with Medtronic CRT-D or ICD were enrolled. During a mean follow-up period of 352±131 days, 531 clinical data were transmitted via CareLink Network. The ratio of OptiVol fluid alerts was 31% (163 episodes) of all episodes. 56 patients (68%) presented positive results, 18% (30 episodes) of them presented the signs of worsening of HF (group A). In contrast, 133 episodes presented no signs of worsening HF (group B). The mean time between the initial OVFI threshold crossing and peak amplitude in group A was longer than group B (19.1±6.8 vs 12.6±10.2 days, P=0.0014). The mean duration above the OVFI threshold in group A was longer than group B (49.1±34.2 vs 17.6±16.2 days, P<0.0001). The frequency of peak amplitude of OVFI exceeding 200 (ohm) was higher in group A than group B (76.7% vs 9.0%). These results suggest that gradual elevation, extended thereshold crossing period and higher amplitude of OVFI may be useful to discriminate false-positive events.

An average inverse power ratio method for the damping estimation from a frequency response function

The well-known bandwidth method, especially the half-power bandwidth method [1,3,4] (Bishop and Gladwell, 1963; Nashif et al., 1985; Yin, 2008) is probably the simplest method for the damping estimation from a frequency response function (FRF). This method is quite efficient for simple model test cases when modes are well separated. However, the determination of the two frequencies corresponding to a given power ratio value requires numerical interpolations of experimental discrete data of frequency response functions. In this paper, an average inverse power ratio method is proposed. The average value is computed at two frequencies symmetrically located from a peak amplitude frequency. Then the damping ratio can be estimated by using a formula similar to that of the bandwidth method. In this way, the damping estimation becomes straightforward from the FRF data. This new method could be useful for engineers in practice due to its extreme simplicity.

Tone burst vestibular evoked myogenic potentials: diagnostic criteria in patients with Ménière's disease

Conclusion: We suggest that 1/0.5 kHz FPA would be clinically useful in the diagnosis of Ménière's disease. Objective: To determine whether clinically useful VEMP parameters could be identified using different tone burst stimuli for the diagnosis of Ménière's disease. Subjects and methods: The Ménière's group included 24 affected ears from definite Ménière's disease and 26 affected ears from probable Ménière's disease. The control group included 20 normal ears. Using tone bursts of 0.5 and 1 kHz, two parameters were examined: 1) the frequency peak amplitude ratio (1/0.5 kHz FPA), where the peak amplitude was determined by the difference in amplitude between peak p13 and peak n23 ipsilaterally; and 2) the interaural amplitude difference (IAD) ratio, defined as the difference in amplitude between peaks p13 and n23 (p13–n23) in the right and left ears divided by the sum of p13–p23 in both ears. Results: Data showed that the 1/0.5 kHz FPA ratios in the Ménière's group were significantly elevated compared with those of the control group (p<0.001) and the recommendable cut-off value for the diagnosis of Ménière's symptoms using 1/0.5 kHz FPA was > 0.7. However, the IAD ratio did not show significant differences in either the 0.5 or 1 kHz stimulus conditions.