scholarly journals The nature of alarm communication in Constrictotermes cyphergaster (Blattodea: Termitoidea: Termitidae): the integration of chemical and vibroacoustic signals

Biology Open ◽  
2015 ◽  
Vol 4 (12) ◽  
pp. 1649-1659 ◽  
Author(s):  
P. F. Cristaldo ◽  
V. Jandak ◽  
K. Kutalova ◽  
V. B. Rodrigues ◽  
M. Brothanek ◽  
...  
Keyword(s):  
Alarm Communication ◽  
Vibroacoustic Signals

scholarly journals Research of vibroacoustic signals in diagnostics of technical condition of engines of beet harvesters combines

2020 ◽  
Vol 1679 ◽  
pp. 042032
Author(s):  
I L Rogovskii ◽  
O S Zapadlovskij ◽  
S A Voinash ◽  
K Y Maksimovich ◽  
V A Sokolova ◽  
...  
Keyword(s):  
Technical Condition ◽  
Vibroacoustic Signals

Nonlinear Analysis of Combustion Engine Vibroacoustic Signals for Misfire Detection

2003 ◽  
Author(s):  
Piotr Boguś ◽  
Jerzy Merkisz ◽  
Rafał Grzeszczyk ◽  
Stanisław Mazurek
Keyword(s):  
Nonlinear Analysis ◽  
Combustion Engine ◽  
Misfire Detection ◽  
Vibroacoustic Signals

Chemical and vibratory signals used in alarm communication in the termite Reticulitermes flavipes (Rhinotermitidae)

2018 ◽  
Vol 66 (2) ◽  
pp. 265-272 ◽  
Author(s):  
O. Delattre ◽  
J. Šobotník ◽  
V. Jandák ◽  
J. Synek ◽  
J. Cvačka ◽  
...  
Keyword(s):  
Reticulitermes Flavipes ◽  
Alarm Communication ◽  
Vibratory Signals

scholarly journals Assessment of disc brake vibration in rail vehicle operation on the basis of brake stand

2021 ◽  
Vol 23 (2) ◽  
pp. 221-230
Author(s):  
Wojciech Sawczuk ◽  
Agnieszka Merkisz-Guranowska ◽  
Armando-Miguel Rilo Cañás
Keyword(s):  
Mass Distribution ◽  
System Component ◽  
Brake Disc ◽  
Imaging Method ◽  
Disc Brake ◽  
Lever System ◽  
Vehicle Operation ◽  
Lever Mechanism ◽  
The Right ◽  
Vibroacoustic Signals

The scientific aim of the article is to present the relationship between the vibroacoustic signals of the right and left friction pad during braking, depending on the mass distribution, as an element of the lever system. This article presents the results of tests of a railway disc brake in the scope of vibrations generated by pads in various states of wear located on both sides of the brake disc. The tests were carried out on the brake stand using the vibroacoustic method including the analysis of amplitudes and frequencies and the thermal imaging method. Special attention was paid to the analysis of the classic lever mechanism as a multimass system influencing the thermo-mechanical characteristics and vibrations of the pads on the right and left side of the brake disc. Uneven mass distribution of the system translates into uneven wear of the friction components. The scientific aim of this paper is to present the relation between vibroacoustic signals of the right and left friction pad during braking depending on the mass distribution of the lever system component.

scholarly journals Estimation of differences in selected indices of vibroacoustic signals between healthy and osteoarthritic patellofemoral joints as a potential non-invasive diagnostic tool

2021 ◽  
Vol 2130 (1) ◽  
pp. 012009
Author(s):  
R Karpiński ◽  
P Krakowski ◽  
J Jonak ◽  
A Machrowska ◽  
M Maciejewski ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Invasive Procedure ◽  
Superficial Layer ◽  
Degenerative Changes ◽  
Joint Disease ◽  
Control Group ◽  
Kinetic Chain ◽  
Non Invasive ◽  
Joint Surfaces ◽  
Vibroacoustic Signals

Abstract Osteoarthritis (OA) is currently the most generic form of joint disease. It is a complex process in which degenerative changes occur in the articular cartilage [AC], subchondral bone, and synovial membrane and can lead to permanent joint failure. The primary and most commonly used method of diagnosing degenerative changes is classic radiography. Magnetic resonance imaging (MRI) may be used to assess the extent of damage to joint surfaces, but this method is limited by the availability of specialised equipment and the excessive cost of the examination. Arthroscopy, an invasive procedure, is considered the “gold standard” in joint diagnosis. The occurrence of degenerative changes is closely related to the friction and lubrication processes within the joint. The main causes of osteoarthritis are a change or lack of synovial fluid, deformation of the joint bones, local damage to the articular cartilage, and a change in the mechanical properties of the articular cartilage due to water loss from the damaged superficial layer. An alternative, non-invasive method that allows for a delicate assessment of the condition of moving joints is vibroarthrography (VAG). The analysis of vibroacoustic signals generated by moving joint surfaces has an immense potential in the non-invasive assessment of the degree of damage to articular cartilage, meniscus and ligaments and the general diagnosis of degenerative diseases. The purpose of this study is to analyse and statistically compare the basic characteristics of vibroacoustic signals recorded with a CM-01B contact microphone placed on the patella for motion in the 90°–0°–90° range in a closed kinetic chain (CKC) in a control group (HC) and a group of patients diagnosed with osteoarthritis (OA), qualified for the knee alloplasty.

The method of fundamental harmonic frequency determination

2021 ◽  
Vol 63 (1) ◽  
pp. 38-42
Author(s):  
Tomasz Szczepański ◽  
Stanisław Traczyk ◽  
Paweł Dziedziak
Keyword(s):  
Fundamental Frequency ◽  
Patent Application ◽  
Diagnostic Methods ◽  
Main Process ◽  
Harmonic Frequency ◽  
Frequency Determination ◽  
The Subject ◽  
Mechanical Devices ◽  
Vibroacoustic Signals ◽  
Better Than

Analysis of vibroacoustic signals is one of the more frequently used mechanical devices diagnostic methods occurring among others in car diagnostics. Often, it happens that the most important element of the recorded course is the fundamental harmonic frequency of vibrations. Fundamental frequency indicates the main process related to the operation of the device and allows to follow its course. In the article the author's method of determining the fundamental frequency in the signal will be presented which is the subject of a patent application. Its theoretical basis and application examples were discussed comparing the accuracy of its use with the accuracy of other methods. The frequency range where the method finds application is shown. That is, where its accuracy turns out to be better than the accuracy of popular used methods to fundamental harmonic frequency determination.

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