Some Aspects Regarding the Action of Vibrations on the Human Knee Joint

Machines that use vibrations in the work process are found in various activities, on construction sites or within the premises of some constructions. Their operators are affected over time by mechanical oscillations. Entering the body through the hand-arm assembly, through the legs, or while sitting, the vibrations affect the human body, usually in a negative way. The positive effects are currently being studied in order to be able to improve various human joint conditions or to improve physical condition, but exposure must be done in a controlled environment and under well-established conditions defined by specialists.Over time, various studies have been carried out and solutions have been sought to reduce the effects of vibrations on the human body. The difficulty of performing in vivo experiments on people has led to the use of increasingly complex theoretical models to study the problem. By comparing the results obtained from modeling with experimental results collected through measurements under different conditions on the construction site or in the laboratory, useful information was obtained, which can be used to improve the working conditions of workers.The search for a theoretical model as efficient as possible, and for methods as fast as possible to obtain information about the vibrations that affect the human body, is ongoing, the human body being very complex and difficult to model.This article investigates the effect of mechanical oscillations on the knee joint of rotary hammer operators, comparing results obtained through laboratory measurements with those obtained from modeling.