Misją Instytutu jest dzialalność naukowo-badawcza prowadząca do nowych rozwiązań technicznych i organizacyjnych użytecznych w kształtowaniu warunków pracy zgodnych z zasadami bezpieczeństwa pracy i ergonomii oraz ustalanie podstaw naukowych do właściwego ukierunkowywania polityki społeczno-ekonomicznej państwa w tym zakresie.
SOURCES OF EXPOSURE TO ULTRASONIC NOISE IN THE WORKING ENVIRONMENT
Ultrasonic noise sources can be divided into two main groups:
- technological, i.e. sources in which ultrasounds are produced intentionally for the implementation of technological processes,
- non-technological, in the case of which low-frequency ultrasound arises as an unintended and undesirable effect of a technological process.
In technological sources of ultrasonic noise, this noise is most often emitted in narrow frequency bands related to the rated operating frequency of the ultrasonic device (in the range of 18-40 kHz). These sources are also characterized by considerable acoustic power. The most important of the technological sources of ultrasonic noise are:
- ultrasonic washers (rinsers) - they constitute about 2/3 of all technological ultrasonic devices and are used for cleaning parts and components (the sound pressure levels of ultrasonic components for these devices reach up to 130 dB),
- ultrasonic welders - used for ultrasonic welding of metals and plastics, they are sources of noise with the highest levels of acoustic pressure ( up to 140dB) and, additionally, their operation is often impulse / shock,
- ultrasonic drilling machines, used to create cavities and holes in various materials (acoustic pressure levels in the range of 90 - 120 dB).
The non-technological sources of ultrasonic noise include, but are not limited to:
- machines and tools for processing metal and wood (high-speed) such as milling machines, grinders, circular saws,
- machines and tools with compressed air (pneumatic tool, textile machines),
- machines and devices for cutting with plasma or oxy-acetylene torch.
