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    Wyświetlanie 1-3 z 3
    Tytuł:
    Upper Limb Load as a Function of Repetitive Task Parameters: Part 2 - An Experimental Study
    Autorzy:
    Roman-Liu, D.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/90499.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    electromyography
    upper limb
    handgrip force
    cycle load
    praca powtarzalna
    obciążenie fizyczne
    kończyna górna
    siła mięśni
    elektromiografia
    obciążenie pracą
    Opis:
    The aim of the study was to compare the theoretical indicator of upper limb load with the physiological indicator of musculoskeletal load, which is present while performing a repetitive task (a normalized electromyography [EMG] amplitude recorded from the muscles of the upper limb involved in the performed task). In an experimental study of a repetitive task, the EMG signal from 5 main muscles of the shoulder girdle, arm and forearm was registered: extensor carpi radialis longus, flexor carpi ulnaris, deltoideus anterior, biceps brachii caput breve and trapezius descendent. The results of the study showed a strong correlation between the theoretical indicator (Integrated Cycle Load) and the physiological indicator (root mean square of a normalized EMG amplitude from the 5 muscles). This proves that the developed theoretical indicator can be accepted as an indicator of upper limb musculoskeletal load during a work task.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 103-112
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upper Limb Load as a Function of Repetitive Task Parameters: Part 1 - A Model of Upper Limb Load
    Autorzy:
    Roman-Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/90123.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    external load
    upper limb
    handgrip force
    cycle work
    repetitive task parameters
    praca powtarzalna
    obciążenie fizyczne
    kończyna górna
    siła mięśni
    obciążenie pracą
    Opis:
    The aim of the study was to develop a theoretical indicator of upper limb musculoskeletal load based on repetitive task parameters. As such the dimensionless parameter, Integrated Cycle Load (ICL) was accepted. It expresses upper limb load which occurs during 1 cycle. The indicator is based on a model of a repetitive task, which consists of a model of the upper limb, a model of basic types of upper limb forces and a model of parameters of a repetitive task such as length of the cycle, length of periods of the cycle and external force exerted during each of the periods of the cycle. Calculations of the ICL parameter were performed for 12 different variants of external load characterized by different values of repetitive task parameters. A comparison of ICL, which expresses external load with a physiological indicator of upper limb load, is presented in Part 2 of the paper.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 93-102
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective utilization of man shift through sustainable workload testing for underground mining machine operators. An ergonomic based man-machine interface approach
    Autorzy:
    Dey, Netai Chandra
    Dey, Shibaji
    Powiązania:
    https://bibliotekanauki.pl/articles/2064404.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    fatigue sustainability
    FS
    muscle force
    MF
    heart rate ratio
    HR ratio
    exposure time period
    ETP
    effective utilization of man shift
    EUMS
    workload simulation
    siła mięśni
    obciążenie pracą
    okres ekspozycji
    degradacja zmęczeniowa
    tętno
    środowiskowe warunki pracy
    Opis:
    Insight of man-machine interfaces during mining machine operations, better co-ordinance with human efficiencies and suitable workload selection in underground mining machine operation are the main viewpoints of the study. Total 12 side discharge loader (SDL) and load haul dumper (LHD) operators [N = 12] have been taken as participants of the study. The methodology is divided into two parts first part is devoted to measuring and analyzing workload response of machine operation with polar heart rate monitor. Machine operator’s heart rate ratio (HR ratio) for the whole shift is recorded and metabolic rate (MR) has been analyzed. Additionally, fatigue sustainability (FS) and degradation of muscle force (MF) are recorded for each work cycles up to exposure time period (ETP) of 360 minutes. In the second part of the methodology, based on the HR ratio recorded during the mining operation, a workload simulation study is undertaken on a treadmill at the surface following BRUCE protocol. At treadmill, based on HR ratio, workload achieved from mines along with three different workloads i.e. low, moderate and high has been tested. Differences in FS and degradation rate of MF after each workload experiment have been recorded. A result from the underground operational study shows that there is about 43.2% and 32.4% of decreasing MF for SDL and LHD operators after end of spells at mines. Additionally, a negative correlation (r = -0.99) is found between ETP and MF. The workload simulation study shows that there are significant differences between FS (p < 0.05) and MF (p < 0.05) data of mining and treadmill experiment with the same workload. In comparison to an underground operation, FS rate of low, moderate and high workload is recorded 60%, 35%, and 15% higher respectively than of mine workload. Higher FS rate may achieve due to availability of good environment. Among the tested workload only low kind of workload is found suitable for mining machinery job as degradation of MF is found significantly (p < 0.05) low and FS is found significantly (p < 0.01) high in this kind of workload. Therefore, it can be concluded that in mining machinery operation better to adopt low workload for effective utilization of man shift (EUMS) as it gives comparatively low MF degradation and better FS during continuous work.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 394--403
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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