The article notes that occupational safety in industry largely depends on the working equipment reliability. Among the various methods of maintaining equipment operability, there is a diagnostic method that helps to identify hidden defects before they appear. Thanks to equipment diagnostics, it is possible to increase safety, avoid accidents, catastrophes, and minimize repair and operation costs. There are two types of diagnostic methods: contact and non-contact. The most efficient non-contact methods are acoustic methods that are not associated with the destruction of the equipment under study. The possibility of applying the methods of auscultation used in medicine for diagnosing the state of industrial equipment is shown. Various methods and devices of auscultation are considered. The advantages and disadvantages of currently existing auscultation devices are noted. The design of an auscultation device with a mechanical sound flux seal is presented. Mechanical sealing of the sound flux is based on the parabolic reflectors use. The efficiency of using parabolic reflective surfaces is shown. A relationship is obtained that relates the magnitude of the amplification of the sound flux with the dimensions of the auscultation device. The results of calculations of the increase in the sound level in the auscultation device show that even with a sufficiently small ratio of the diameter of the inlet for the sound flux to the diameter of the outlet cross section of the sound flux and the diameter of the reduced parabolic reflector, a noticeable increase in the sound level is obtained when using a mechanical amplifier of the sound flux in the auscultation device.
2. Starodubtseva A.M., Fedotova A.G. Acoustic Methods for Detection of Quarantine Pests of Wood. Zashchita i karantin rasteniy = Plant protection and quarantine. 2018. № 8. pp. 33–36. (In Russ).
3. Khokhlova T.D., Pelivanov I.M., Karabutov A.A. Methods for optical-acoustic diagnostics of the biological tissues. Akusticheskiy zhurnal = Acoustic Journal. 2009. Vol. 55. № 4–5. pp. 672–683. (In Russ).
4. Kachalov A.Yu., Krutyakov Yu.A., Neustroev V.P., Yankov V.I. Method for correcting the direction of the axis of the reflective receiver of sound waves to visually difficult to observe or unobservable sound sources. Patent RU 2643690 C2. Applied: February 20, 2016. Published: February 5, 2018. Bulletin № 4. (In Russ).
5. Yuzbashev Z.Yu., Skvortsov Yu.I., Skvortsov K.Yu., Bogdanova T.M. Heart Auscultation: Misunderstanding and Last Scientific Facts. Uspekhi sovremennogo estestvoznaniya = Advances in Current Natural Sciences. 2015. № 4. pp. 97–105. (In Russ).
6. Murzinov V.L., Murzinov Y.V., Popov S.V., Tatarinova Y.V. Formation of given sound field by modeling sound reflecting surface. Akustika. 2019. Vol. 34. pp. 28–31.
7. Murzinov V.L., Popov S.V., Tatarinova Yu.V. Modeling the shape of a sound-reflecting surface for obtaining the given sound field. Noise Theory and Practice. 2019. Vol. 5. № 2 (16). pp. 14–19. (In Russ).
8. Blashkin I.I. Device for auscultation. Copyright certificate SU 1168200 A1. Applied: June 3, 1982. Published: July 23, 1985. Bulletin № 27. (In Russ).
9. Eremenko S.V., Zinkovich I.I., Shlyakhover V.E. Device for auscultation. Copyright certificate SU 1202553 A. Applied: June 28, 1984. Published: January 7, 1986. Bulletin № 1. (In Russ).
10. Pavlov A.V., Smergina E.Yu., Petlyakovskiy A.V. Device for auscultation. Patent RU 102485 U1. Applied: August 17, 2010. Published: March 10, 2011. Bulletin № 7. (In Russ).
11. Murzinov V.L., Murzinov P.V., Murzinov Yu.V. Tatarinova Yu.V., Popov S.V. Device of the sound flux seal for auscultation. Patent RU 192449 U1. Applied: July 23, 2019. Published: September 17, 2019. Bulletin № 26. (In Russ).
12. Sapozhkov M.A. Electroacoustics. Мoscow: Svyaz, 1978. 272 p. (In Russ).