The estimation of changes in the noise level generated by devices equipped with two-stroke internal combustion engines with small displacement volume

Abstract

Two-stroke single-cylinder internal combustion engines with small displacement volume belong to a group of driving units which are characterized by considerably noisy operation. These engines, owing to small sizes, small weight and the convenience of their use, are applied in devices such as grass trimmers, brush cutters or chainsaws for cutting wood. Their influence on the environment and labourers lowers the comfort of staying in a place where such devices are operated and poses a threat to human health. This paper presents the results of noise measurements carried out by the authors to assess a change in the noise level emitted by two-stroke single-cylinder internal combustion engines with small displacement volume, which are used as a drive in grass trimmers. In the tests and in an analysis of the results, the influence was determined of parameters such as displacement volume, power and the technical condition of the engine, on the level of the emitted noise which reaches the operator.

Keywords

• combustion engine
• noise
• grass trimmers
• operation