![]() ![]() The tuning fork models developed in this study generated different frequencies proposed by the scientific literature as effective in the mobilization of pulmonary secretions. Each equipment reaches a fixed frequency preset of 12, 15 and 20 Hz measured by digital oscilloscope. This study shows the result of the development of others three tuning forks of different dimensions to generate different frequencies. The tuning fork is activated by squeezing the tips of the extensions together and releasing them in a sudden movement. The device is characterized by a bottom end containing a transducer with a diameter of 62 mm and a thickness of 5/16 mm (8''), a rod removable 148 mm, fork length of 362 mm and an extension at the upper end of sinuous shape bilaterally.The tuning forks must be applied at an angle of 90° directly on the chest wall of the patient after pulmonary auscultation for location of secretions. This device generated a frequency of 25 Hz and had a weight of 521 g, with dimensions of 600 mm in total length. The first tuning fork was made with a fixed frequency of 25 Hz and it was recorded in the Brazilian institution of patent registration. The aim of the present study is to develop tuning forks with different frequencies, for use in bronchopulmonary hygiene therapy. It is expected that a tuning fork is able to generate vibrations in the thorax, facilitating bronchial hygiene. The optimal vibration frequency to mobilize secretions is widely debated and varies between 3 and 25 Hz. ![]() The tuning fork therapeutic for the purpose of bronchial hygiene has still not been described in the literature. You can find the helper functions animateSixTuningForkModes and tuningForkFFT and the geometry file TuningFork.stl at matlab/R20XXx/examples/pde/main.The main function of the mucociliary system is the removal of particles or substances that are potentially harmful to the respiratory tract. This example simulates these aspects of the tuning fork dynamics by performing a modal analysis and a transient dynamics simulation. Therefore, a properly excited tuning fork vibrates with a dominant frequency corresponding to the fundamental frequency, producing a pure audible tone. The next higher mode with a symmetric mode shape is about 6.25 times the fundamental frequency. This axial vibration can be used to amplify the audible sound by bringing the end of the handle in contact with a larger surface area, like a metal table top. Transverse vibration of the tines causes the handle to vibrate axially at the fundamental frequency. ![]() The lack of bending at the base enables easy handling of the tuning fork without influencing its dynamics. The fundamental mode of vibration does not produce any bending effect on the handle attached at the intersection of the tines. The first flexible mode of a tuning fork is characterized by symmetric vibration of the tines: they move towards and away from each other simultaneously, balancing the forces at the base where they intersect. When struck on one of its prongs or tines, it vibrates at its fundamental (first) frequency and produces an audible sound. This example shows how to perform modal and transient analysis of a tuning fork.Ī tuning fork is a U-shaped beam. ![]()
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