scholarly journals Functions of Chordotonal Sensilla in Bushcrickets (Orthoptera, Tettigoniidae)

2021 ◽  
Vol 101 (6) ◽  
pp. 755-766
Author(s):  
R. D. Zhantiev ◽  
O. S. Korsunovskaya
Keyword(s):  
Stimulus Frequency ◽  
Vibration Velocity ◽  
Frequency Range ◽  
Vibration Acceleration ◽  
Resonance Vibrations ◽  
Single Sensillum ◽  
Vibrational Sensitivity ◽  
Increased Sensitivity ◽  
Vibration Parameters ◽  
Electrophysiological Methods

Abstract Acoustic and vibrational sensitivity of single identified auditory receptors in bushcrickets was studied by electrophysiological methods. In the intermediate organ, some neurons were identified whose response to acceleration did not depend on the stimulus frequency over a significant frequency range; along with them, there were cells showing increased sensitivity to frequencies of 0.4–0.8 kHz for displacement, and/or 0.1–0.3, 1–1.2, and 1.4–3 kHz for all the vibration parameters. In addition, most of the studied receptors had a zone of increased sensitivity to highfrequency vibrations at 1.5–2.5 kHz. In the sensilla of the crista acustica, increased sensitivity was recorded at frequencies of 0.1–0.3, 0.4–0.8, 1–1.2, and 1.4–2.5 kHz. The best frequencies of a single sensillum may lie in different frequency ranges for different vibration parameters. Such differences in sensitivity to vibration acceleration, vibration velocity, and displacement, and also the different best frequencies in the receptors of the intermediate organ and the crista acustica were probably determined by differences in size, position, and morphological details of the sensilla, their own resonances, and reactions to resonance vibrations of the trachea section bearing the vibroreceptors. Thus, the chordotonal sensillum is a bifunctional mechanoreceptor which, along with auditory sensitivity, can combine the functions of both a displacement receiver and an accelerometer due to the different mechanical properties of its cells and the surrounding structures.

scholarly journals Analyzing vibration parameters of a modern high-speed engine during operation

2021 ◽  
Vol 2061 (1) ◽  
pp. 012056
Author(s):  
V V Gerasidi ◽  
A V Lisachenko
Keyword(s):  
Experimental Research ◽  
High Speed ◽  
Vibration Velocity ◽  
Frequency Range ◽  
Vibration Acceleration ◽  
Vibration Displacement ◽  
Black Sea Region ◽  
High Speed Engine ◽  
Vibration Parameters ◽  
Speed Engine

Abstract The paper presents results of experimental research into vibration parameters of a modern electronic control-enabled main high-speed engine, Caterpillar CAT 3516B as obtained during a running trial of a sea tug. CAT 3500 series Caterpillar high-speed engines are extensively used in sea tugs; there are about 40 units installed in vessels operating in the Azov and Black Sea region. The research technique involved measurement of vibration displacement, vibration velocity, vibration acceleration at an engine and its turbocharger components. The conducted experimental research has shown that in order to evaluate the technical state of an engine, it is necessary to measure vibration displacement and vibration velocity in a frequency range from 1 to 1000 Hz at 0.1 Hz intervals. For turbochargers, the vibration acceleration shall be measured in a frequency range from 1 to 15000 Hz at 1 Hz intervals. The results of the experimental research allowed determining necessary conditions for measurement of vibration parameters of Caterpillar CAT-3500 series modern high-speed engines commonly used in sea tugs. The experimental research into vessel installations by in-place diagnostics at operating sea-going vessels forms a foundation of an autonomous ship control system.

scholarly journals Vibration Transmitted to the Human Body during the Patient’s Ride in a Wheelchair

2017 ◽  
Vol 42 (1) ◽  
pp. 137-148 ◽  
Author(s):  
Zygmunt Dziechciowski ◽  
Magdalena Kromka-Szydek
Keyword(s):  
Spectral Analysis ◽  
Human Body ◽  
The Body ◽  
Frequency Range ◽  
Vibration Acceleration ◽  
Surface Type ◽  
Wheelchair User ◽  
Vibration Parameters ◽  
Floor Surfaces ◽  
Insight Into

Abstract The study investigates the spectra of vibrations transmitted onto the body of a wheelchair user during the ride on typical floor surfaces in public buildings and in their vicinity. Three wheelchair types are considered in the study (universal and active ones). Selected factors are examined that determine the amplitude of vibration acceleration acting upon humans in the analysed frequency range (wheelchair type, user’s body mass, surface type). The spectral analysis gives an insight into some of the factors which lead to a change of the vibration parameters registered at the user’s seat.

Fabrication and finite element analysis of vibrating parallel film actuator made with cellulose acetate for potential haptic application

2016 ◽  
Vol 230 (15) ◽  
pp. 2720-2727 ◽  
Author(s):  
Md Mohiuddin ◽  
Asma Akther ◽  
Eun Byul Jo ◽  
Hyun Chan Kim ◽  
Jaehwan Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cellulose Acetate ◽  
Vibration Characteristics ◽  
Experimental Results ◽  
Vibration Velocity ◽  
Frequency Range ◽  
Actuation Frequency ◽  
Element Analysis ◽  
Wide Range

The present study investigates a film actuator made with dielectric cellulose acetate films separated by narrow spacers as a means of electrostatic actuation for potential haptic application. Fabrication process for the actuator is explained along with experiments conducted over a wide frequency range of actuation frequency. A valid finite element simulation of the actuator is made on the quarter section of the actuator by using full 3D finite elements. Vibration characteristics such as fundamental natural frequency, mode shape and output velocity in the frequency range for haptic feeling generation are obtained from the finite element analysis and compared with the experimental results. Experimental results demonstrate that the finite element model is practical and effective enough in predicting the vibration characteristics of the actuator for haptic application. The film actuator shows many promising properties like high transparency, wide range of actuation frequency and high vibration velocity for instance.

Comparative results of evaluating the smoothness of automatic transmission gear shifting during car operation

2020 ◽  
Keyword(s):  
Longitudinal Vibration ◽  
Automatic Transmission ◽  
Quality Criteria ◽  
Technical Condition ◽  
Vibration Velocity ◽  
Vibration Acceleration ◽  
Passenger Cars ◽  
Shift Quality ◽  
Vibroacoustic Diagnostics ◽  
Comparative Results

The authors have studied the process of gear shifting, smoothness of it and peculiarities of automatic gearbox functioning of during car operation. The article describes the urgency of the problem of jerks and vibrations when changing gears. When assessing the smoothness of gear shifting, the method of technical state vibroacoustic diagnostics is applied. The method is based on the recorded parameters of vibration velocity, vibration acceleration, vibration movement with their further conversion (fast Fourier transform) into a spectralsignal. The procedure of longitudinal vibration acceleration measurements on cars in operation is described. A comparative analysis of the smoothness of gear shifting in an automatic transmission was carried out using the example of modern passenger cars. Keywords car; car operation; automatic gearbox; technical condition; gearbox malfunction; smoothness; jerks; jolts; gear shift quality criteria; vibration acceleration

Expansion and Contraction of the Oral Disc in the Sea Anemone Tealia Felina

1972 ◽  
Vol 57 (3) ◽  
pp. 633-649
Author(s):  
I. D. MCFARLANE ◽  
I. D. LAWN
Keyword(s):  
Recovery Period ◽  
Stimulus Frequency ◽  
Sensory Response ◽  
Frequency Range ◽  
Oral Disc ◽  
Nerve Net ◽  
Slow Contraction ◽  
Slow Onset ◽  
Radial Muscle ◽  
Stimulation Of

1. Electrical stimulation of the SS 1 of Tealia felina causes inhibition of spontaneousactivity and increase in length of oral disc radial muscle preparations. This response is elicited over a wide stimulus frequency range (1 every 2 sec to 1 every 30 sec). The response shows a slow onset and a long recovery period. 2. Stimulation of the nerve net at frequencies between 1 shock every 5 sec and 1 shock every 20 sec produces slow contraction. The radials also show fast contractions to shocks less than 2 sec apart. 3. Dissolved food substances excite the SS 1 in the column. The sensory response to application of food extract to a small area of the column shows evidence of sensory adaptation. 4. These observations are related to the pre-feeding response of Tealia and a model for oral disc expansion is described.

Vibration Parameters Optimization Experiment on Seeder of Rice Bud-Seed for Field Seedling Raising Based on Virtual Prototyping Technology

2013 ◽  
Vol 341-342 ◽  
pp. 456-461
Author(s):  
Wang Yang ◽  
Jian Yang ◽  
Hui Ruan ◽  
Zhao Xin Liang ◽  
Jian Lin Mo
Keyword(s):  
Influencing Factors ◽  
Virtual Prototype ◽  
Optimal Combination ◽  
Parameters Optimization ◽  
Variation Coefficient ◽  
Dynamics Simulation ◽  
Vibration Velocity ◽  
Passing Rate ◽  
Velocity Interval ◽  
Vibration Parameters

The seeder of rice bud-seed for field seedling raising is a new seedling equipment for field seedling raising, which is a complicated vibration system with multi-freedom. And the effect of the vibration parameters and interactions on the vibration velocity at different locations of the moving rail of two electromagnetic vibration metering devices which are installed side by side is large, and the passing rate of seeding is affected. In this paper, the virtual prototype of seeder of rice bud-seed for field seedling raising is established by ANSYS and ADAMS. The virtual prototype is developed to carry out dynamics simulation by using four-factor quadratic regression orthogonal rotary combination design. Mathematical models of influencing factors of vibration and variation coefficient of vibration velocity, and the factors and average velocity of seeding are established. The factors are optimized. And optimal combination of vibration influencing factors and the variation coefficient of vibration velocity interval with 95% reliability are achieved. The result shows that optimal combination of factors is achieved under the condition that the excitation force amplitude is 39.8N, vibration frequency is 32.7Hz, the velocity is 58.5mm/s, stiffness of vibration isolating rubber pad is 1167N/mm. The corresponding variation coefficient of the vibration velocity is 6.287%, and the average seeding velocity is 18mm/s. The variation coefficient of the vibration velocity interval with 95% reliability is from 2.909% to 9.665%.

Analysis of Shock Resistance on GWC6066 Marine Gearbox

2014 ◽  
Vol 602-605 ◽  
pp. 135-138
Author(s):  
Wen Liu ◽  
Teng Jiao Lin ◽  
Ze Yin He
Keyword(s):  
Dynamic Stress ◽  
Strength Criterion ◽  
Element Model ◽  
Vibration Velocity ◽  
Vibration Acceleration ◽  
Dynamic Finite Element ◽  
Spring Element ◽  
Equivalent Time ◽  
Shock Resistance ◽  
Resistance Performance

The dynamic finite element model of entire gearbox, including gears, shafts, bearings and gearbox housing was established by using the truss element, spring element and tetrahedral element at first. Then the shock spectrum of GWC6066 gearbox was gotten according to German specification BV043/85. After the shock spectrum converted into equivalent time-domain acceleration curve, the vibration velocity, vibration acceleration and dynamic stress of GWC6066 gearbox under the double half-sine acceleration shock excitation were simulated. At last, the shock resistance performance of gearbox was analyzed combining with the strength criterion.

Experimental Evaluation of Vibration Effects Induced by Planed Railway Line on Surrounding Historic Tower

2014 ◽  
Vol 501-504 ◽  
pp. 861-866
Author(s):  
Yuan Tian ◽  
Nan Zhang ◽  
Wei Guo Yang ◽  
Jia Ming Niu
Keyword(s):  
Field Experiments ◽  
Dominant Frequency ◽  
Vibration Velocity ◽  
Vibration Source ◽  
Vibration Level ◽  
Frequency Range ◽  
Structural Vibrations ◽  
Upward Trend ◽  
Railway Line ◽  
Different Types

Using field experiments, the vibration effects of historic tower induced by planed railway line are estimated. The vibrations include the construction vibration and the traffic-induced vibration. The results show that the blasting construction leads to the significant increase in vertical velocity and acceleration. There is no difference between the background vibration of field and foundation of tower. Different types of the sites soil around the tower cause little change. Each measurement time showed an upward trend of vibration level with the increase of frequency. The closer the tower is to the vibration source, the larger the structural vibrations would be. The dominant frequency range for highway-induced vibration is 10-20Hz. For train-induced vibration, the dominant frequency range is more than 40Hz. Surface waves will result in amplification phenomenon of vibration velocity of ancient structures within a certain range.

Research on the Safety Distance Affected by Ultrahigh Energy Dynamic Compaction

2014 ◽  
Vol 1065-1069 ◽  
pp. 172-179
Author(s):  
Zhi Fa Yu ◽  
Shu Wang Yan ◽  
Sheng Li Zhu
Keyword(s):  
Dynamic Compaction ◽  
Vibration Velocity ◽  
Ultrahigh Energy ◽  
Vibration Acceleration ◽  
Safety Distance ◽  
Practical Engineering

By taking practical engineering cases as an example, this article judges the safety distance affected by ultrahigh energy dynamic compaction. Through the organization and analysis of the data of several ultrahigh energy dynamic compaction projects, the opinion that the judgment method of vibration acceleration exists flaws is proposed. Considering the possible influence of dynamic compaction vibration on person and other non-buildings, it suggests to use the method of vibration velocity to judge affected safety distance.

scholarly journals The inverse problem of stabilization of a spherical pendulum in a given position under oblique vibration

2021 ◽  
Vol 8 (2) ◽  
pp. 255-269
Author(s):  
Аlexander G. Petrov ◽  
Keyword(s):  
Inverse Problem ◽  
High Frequency ◽  
Initial Conditions ◽  
Vibration Velocity ◽  
Spherical Pendulum ◽  
Acceleration Vector ◽  
Long Time ◽  
Minimum Amplitude ◽  
Vibration Parameters ◽  
Gravity Acceleration

The inverse problem is posed of stabilizing a spherical pendulum (a mass point at the end of a weightless solid rod of length l ) in a given position using high-frequency vibration of the suspension point. The position of the pendulum is determined by the angle between the pendulum rod and the gravity acceleration vector. For any given position of the pendulum, a series of oblique vibration parameters (amplitude of the vibration velocity and the angle between the vibration velocity vector and the vertical) were found that stabilize the pendulum in this position. From the obtained series of solutions, the parameters of optimal vibration (vibration with a minimum amplitude of velocity) are selected depending on the position of the pendulum. The region of initial conditions is studied, of which the optimal vibration leads the pendulum to a predetermined stable position after a sufficiently long time. This area, following N. F.Morozov et al., called the area of attraction.

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