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    Tractor Ergonomics: TO - Er. H S Dhingra

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    Rohit Saini
    The document discusses ergonomic measurements and improvements made to tractor design. It measures steering angle using a bevel protector, selects test participants of varying heights and weights, and ensures actuator force limits comply with standards. Force measurements are made using an electrical load cell and push-pull gauge. Vibration is measured to ensure levels are within limits. After modifications, the tractor was found to be safe, comfortable and in compliance with ergonomic standards.

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    Tractor Ergonomics: TO - Er. H S Dhingra

    Uploaded by

    Rohit Saini
    40 views14 pages
    The document discusses ergonomic measurements and improvements made to tractor design. It measures steering angle using a bevel protector, selects test participants of varying heights and weights, and ensures actuator force limits comply with standards. Force measurements are made using an electrical load cell and push-pull gauge. Vibration is measured to ensure levels are within limits. After modifications, the tractor was found to be safe, comfortable and in compliance with ergonomic standards.

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    The document discusses ergonomic measurements and improvements made to tractor design. It measures steering angle using a bevel protector, selects test participants of varying heights and weights, and ensures actuator force limits comply with standards. Force measurements are made using an electrical load cell and push-pull gauge. Vibration is measured to ensure levels are within limits. After modifications, the tractor was found to be safe, comfortable and in compliance with ergonomic standards.

    Copyright:

    © All Rights Reserved
    Download as RTF, PDF, TXT or read online from Scribd
    Download as rtf, pdf, or txt
    40 views14 pages

    Tractor Ergonomics: TO - Er. H S Dhingra

    Uploaded by

    Rohit Saini
    The document discusses ergonomic measurements and improvements made to tractor design. It measures steering angle using a bevel protector, selects test participants of varying heights and weights, and ensures actuator force limits comply with standards. Force measurements are made using an electrical load cell and push-pull gauge. Vibration is measured to ensure levels are within limits. After modifications, the tractor was found to be safe, comfortable and in compliance with ergonomic standards.

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    TRACTOR

    ERGONOMICS

    TO - Er. H S Dhingra

    BY- Rohit Saini


    L-2014/15-AE-99-BIV
    INTRODUCTION

    •Ergonomics is the feld of study that examines human behavior, psychological and
    physiological capabilites and can design and modify established work environment
    to maximize, the productvity worker’s comfort and overall efciency.

    • Modern agricultural industry is inclined towards high speed, power and efcient
    agricultural tractor.

    •The nature of tasks on a tractor necessitates a number of actons to be performed


    by the operator, which puts varying physiological demands on the body.
    WORK PLACE DESIGN
    MEASUREMENT (overview)

    • Measurement of steering angle.


    • Selecton of person for taking observaton(feed back).
    • Force Limits for Actuatng Various Controls.
    • Electrical Load Cell .
    • Push-Pull Gauge .
    • Measurement of Vibraton Transmited in Tractor.
    Measurement of steering angle

    • A Workplace design measurement of tractor includes the


    measurements of steering angle and it is done by using ‘Bevel
    protector’ a bevel protector is a circular or semicircular tool for
    measuring an angle or a circle. The utlized are usually degrees. Bevel
    protector has one or two swinging arm which can be used to help
    measure the angle. Also bevel protector is a graduated circular
    protector having a pivoted arm, used for measuring or marking of
    lines.
    Selection of person for taking
    observation

    • In selecton of person following consideratons can be adopted,


    Persons are having the diferent height; Persons are having diferent
    state.

    • Anthropometric data taken as Height in mm, weight in kg. Hand


    length in mm (hand length is upper most shoulder to the tp of middle
    fnger), Foot length in mm, Eye height (seatng) in mm, Body girth (at
    seatng) in mm.
    Force Limits for Actuating
    Various Controls

    • As the pedals are moved laterally from the middle of the leg, the force
    executable decreases and the discomfort increases . The Indian standard IS:
    10703-1992 specifes the limits for actuatng forces for the various controls.

    • Measurements of various controls are essental for the operator comfort


    and check standard and actual are equal.
    Electrical Load Cell

    • An electrical load cell is a device (Transducer) that is used for convert a force in
    the electrical signal. This conversion is indirect and happens in two stages.
    Through a mechanical arrangement, the force being sensed deforms a strain
    gauge. The Strain gauge converts deformaton (strain) to electric signal.
    Push-Pull Gauge

    • A push pull gauge is a device also used for the force measurements it
    is used for the force measurements of gear shifing lever in the case of
    push pull the controls. Push pull gauge has a limit of 30 kgf.
    Measurement of Vibration Transmitted
    in Tractor

    • Comfort in farm machinery units requires the absence of unpleasant


    intrusions. Vibraton is the principle cause of discomfort in tractors. The
    vibraton level is dependent primarily on factor such as driving surface,
    speed, the RPM of the engine, the type of seat, the kind of tres and the
    constructon of the machine. Afer measurements of vibraton on seat and
    controls check whether it is in limit or not. Vibraton analyzer is used for
    measure vibraton of improved tractor.
    conclusion
    1. The tractor afer ergonomic modifcatons was measured and tested for
    compliance with the Budni recommendatons for tractor workspace design, and
    was found to be OK.

    2. The tractor operators in the survey found that modifed tractor is safe and
    comfortable for driving.
    3. The forces were measured by load cell and push-pull gauge were found to be
    within the physiological force limits specifed by the standards IS: 10703-1992.
    4. The vibratons measured by hand analyzer afer modifcaton was found to be
    within limits specifed by the standard ISO 2041: 1990, ISO 6007.

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