A multi-axis biodynamic measuring handle for a human hand-arm system/Vecosni biodinamicni merilni rocaj za merjenje sistema dlan-roka

The biodynamic response method is increasingly being used to study the human hand-arm system and vibration-induced injuries that affect the hand. Most measurements are made in the dominant forearm direction of excitation, but recently research has turned to multi-axis measurements as well as excitation. This study looks at a new instrument handle that measures the biodynamic responses at the palm and the fingers in multiple directions and, at the same time, removes the need to stop the test and change the orientation of the handle. In addition to the biodynamic response, the sensors inside the handle are able to measure the static push and grip forces simultaneously and therefore remove the need for an additional force plate or force sensor at the handle base, which is typically used to measure the push force. The apparent mass of the handle was measured in order to determine the usable frequency range of the system. Additionally, the apparent mass distribution along the hand was investigated and it was found that the apparent mass distribution along the hand varies with frequency. Keywords: biodynamic response, human hand-arm system, multi-axis measurement, apparent mass distribution, instrument handle Metoda biodinamicnega odziva se vse pogosteje uporablja za raziskovanje vpliva vibracij na cloveske roke ter za proucevanje vibracijskih bolezni, ki prizadenejo roko. Kot pove ze ime, pride do nastanka vibracijskih bolezni takrat, kadar je roka ali njen del daljse casovno obdobje izpostavljena vibracijam. Prenosnost vibracij v posamezne dele roke, ki jih s skupno besedo poimenujemo sistem dlan-roka, razberemo iz dinamskih lastnosti rok, merjenih na dlani, pri prstih ter naprej po roki do rame. Vecina meritev se izvaja le v glavni smeri vzbujanja, tj. v smeri podlakti, pred kratkim pa se je zacelo raziskovati tudi vecosno vzbujanje rok. Merilni rocaji, ki bi bili sposobni meriti biodinamicne odzive rok v vec smereh, so se v fazi razvoja, zato je to podrocje se bolj ali manj neraziskano. Ta clanek predstavlja nov merilni rocaj, ki meri biodinamicni odziv loceno na dlani in pri prstih za vec smeri vzbujanj. Ena od prednosti razvitega rocaja je socasna meritev biodinamicnega odziva dlani in prstov, zato ni vec treba ustavljati meritve in spreminjati polozaj rocaja, kot je bilo obicajno pri do sedaj razvitih napravah. Poleg samega biodinamicnega odziva lahko zaznavala v rocaju merijo tudi kvazi staticne sile. Meritve staticne pridrzalne in delovne sile so bistve