EVALUASI GETARAN DI TEMPAT KERJA OCCUPATIONAL VIBRATION SUSENO

EVALUASI GETARAN DI TEMPAT KERJA (OCCUPATIONAL VIBRATION) SUSENO HADI PUSAT KESELAMATAN DAN KESEHATAN KERJA DEPNAKERTRANS RI 2010

Apakah yang disebut sebagai getaran? v. Frequency v. Amplitude v. Acceleration Pusat K 3 ©

Apakah Vibrasi itu? Vibration is defined by its magnitude and frequency. The magnitude of vibration could be expressed as the vibration displacement (in meters), the vibration velocity (in meters per second) or the vibration acceleration (in meters per second or m/s²). Most vibration transducers produce an output that is related to acceleration; so acceleration has traditionally been used to describe vibration

Vibration Exposure Contact with Vibrating Machine: • Segmental Vibration ‘Segment of body’ such as hand-transmitted vibration (known as hand-arm vibration or HAV) • Whole Body Vibration transmitted through the seat or feet (known as wholebody vibration or WBV). Pusat K 3©

Hand Arm Vibration • WHAT IS HAV? HAV is vibration transmitted from work processes into workers’ hands and arms. It can be caused by operating hand-held power tools such as road breakers, hand-guided equipment such as lawn mowers, or by holding materials being processed by machines such as pedestal grinders. • WHEN IS IT HAZARDOUS? Regular and frequent exposure to high levels of vibration can lead to permanent injury. This is most likely when contact with a vibrating tool or process is a regular part of a person’s job. Pusat K 3 ©

Hand Arm Vibration High vibration v impact wrenches Moderate vibration v carpet strippers v chain saws v percussive tools • jack hammers • scalers • riveting or chipping hammers v grinders v sanders v jig saws Pusat K 3 ©

Hand Arm Vibration - Causes & Effects WHAT INJURIES CAN HAV CAUSE? Regular exposure to HAV can cause a range of permanent injuries to hands and arms including damage to the: v Blood circulatory system (e. g. vibration white finger) v Sensory nerves v Muscles v Bones v Joints Pusat K 3 ©

Hand Arm Vibration Management & Control Risk Management Process Identify Sources Assess Exposures Monitor & Evaluate Implement Controls Pusat K 3 ©

Hand Arm Vibration – Management & Control Tool & Machine Manufacturers are required by law to: v Design and construct equipment which will cause the minimum risk of vibration injury; v Provide you with warning of any residual risks from vibration; v Provide you with information on vibration levels; v Provide you with instructions on how to use the equipment to avoid risks from vibration. Manufacturers’ vibration data needs careful interpretation Pusat K 3 ©

Remote control vibratory plate Operator vibration exposure - Zero Pusat K 3 ©

Vibration reduced breaker v. Keep the moil point sharp v. Break a little at a time, v. Don’t get jammed v. Don’t force anti-vibration handles v. Stop breaker before pulling out Pusat K 3 ©

• Found in electric, pneumatic or gas driven tools • Industries: – Construction – Logging – Equipment and machinery repair – Ship Yards – Automobile manufacturing and repair – Building and maintenance of roads and railways – Foundries – Mines and quarries – Plate and sheet metal manufacturing – Public Services and public utilities

What is Hand-Arm Vibration? Hand-Arm Vibration is the transfer of vibration from a tool to a worker’s hand arm. The amount of HAV is related to the acceleration level of the tool when grasped by the worker and in use. The vibration is typically measured at the handle of the tool while in use to determine the acceleration levels transferred to the worker. Acceleration - the rate of change of velocity in speed or direction per unit time (e. g. , per second) …another way of putting it is the speed at which the vibrating surface goes back and forth…

Whole Body Vibration -WBV v WBV is caused by machinery vibration passing through the buttocks of seated people or the feet of standing people. The most widely reported WBV injury is back pain. v Many sources of back injury in addition to WBV, which must be adequately controlled if risk of back pain and injury is to be minimised v Those at risk include regular drivers of: Construction and quarrying vehicles and machinery Tractors and other agricultural and forestry machinery Industrial trucks such as lift trucks Road haulage vehicles, rail vehicles, and buses Those operating large static compaction, hammering and mobile crushers can be exposed to high levels of WBV v Those working on vibrating platforms v v v Pusat K 3 ©

Whole Body Vibration(WBV) WBV refers to mechanical energy oscillations which are transferred to the body as a whole (in contrast to specific body regions), usually through a supporting system such as a seat or platform. Typical exposures include driving automobiles and trucks, and operating industrial vehicles.

Pelaksanaan Pengukuran Getaran Persiapan alat serta pernak-perniknya Memastikan kalibrasi Memasang pernak-pernik alat sesuai dgn getaran yang akan diukur Memasangkan transducer pada obyek pengukuran Merekam hasil pengukuran mencatat Menginterpretasi hasil pengukuran Menuangkan dalam laporan

VI-400 PRO The VI-400 PRO is an all digital, four channel, Type 1 vibration meter and analyzer, with optional Class 1 sound analysis. It is an ideal choice for machine, hand-arm or whole body vibration measurement using channels 1, 2 and 3 with appropriate accelerometer/s and sound measurement using channel 4 with a microphone and preamp.

Tampilan Depan VI-400 PRO The front panel of the VI- 400 Pro instrument contains the following control pushbuttons: 1. <Enter>, (<Menu>). 2. <Esc> escape, (<�� >) backlight. 3. <Alt f> alternate function. 4. <�� > up arrow. 5. <�� > left arrow. 6. <�� > right arrow. 7. <�� > down arrow. 8. <Pause>, (<Proceed>). 9. <Start / Stop>.

Persiapan Peralatan Alat utama pengukur getaran Baterrei Transducers (dan kabelnya) Formulir pencatat hasil

Proses Pengukuran 1. 2. 3. 4. 5. 6. 7. Setting peralatan Mengetest alat kalibrasi Pemasangan transducer ke obyek yang diukur Pengukuran hingga waktu tertentu selama obyek berproses Merekam/mencatat angka maximum yang tertera didisplay Interpretasi hasil pengukuran Menuangkan dalam laporan

Setting Alat

Kalibrasi Alat 1. Sensitivity 2. Measurement Connecting the shaker and accelerometer

EN ISO 5349 -2: 2001 Mechanical vibration — Measurement and evaluation of human exposure to hand-transmitted vibration — Part 2: Practical guidance for measurement at the workplace

Memasang tranducers pada hand arm

Memasang transducers pada whole body

Connect Hand-Arm Accelerometer to VI-400 Pro

Attach Hand-Arm Accelerometer to Tool to be Monitored

Have Worker Operate Tool Collect Data While Tool is in Use

Letakan Seat Pad Accelerometer pada obyek yang akan dimonitor

Have Vehicle Operator Sit on Seat Pad Collect Data While Vehicle is in Use

Turn on VI-400 Pro using the Proceed/Pause and Start/Stop button simultaneously

Place VI-400 Pro in Run Mode to Recording Data by pressing the Start/Stop button

Stop Recording at End of Desired Monitoring Period by pressing the Start/Stop button

Connect USB Computer Interface Cable between VI-400 Pro and PC

Standar Evaluasi Getaran di Tempat Kerja Kep Menaker No. 51/MEN/1999 – Nilai Ambang Batas Faktor Fisika di Tempat Kerja Hand-arm (8 jam) = 0. 4 m/s 2 Whole Body (8 jam) = 0. 5 m/s 2 Standar lain (Kep Men LH 49 Tahun 1996 – Baku Mutu Tingkat Getaran) Konversi : Percepatan = (2 pf)2 x simpangan Kecepatan = 2 pf x simpangan p = 3, 14

Vibrations arise when a body moves back and forth due to external and internal forces, Figure B. 1. In the case of whole-body vibration, it may be the seat of a vehicle or the platform on which a worker is standing that vibrates, and this motion is transmitted into the body of the driver

Vibration is defined by its magnitude and frequency. The magnitude of vibration could be expressed as the vibration displacement (in metres), the vibration velocity (in metres per second) or the vibration acceleration (in metres per second or m/s²). However, most vibration transducers produce an output that is related to acceleration (their output is dependent on the force acting on a fixed mass within the transducer and, for a fixed mass, force and acceleration are directly related); so acceleration has traditionally been used to describe vibration.

Frequency represents the number of times per second the vibrating body moves back and forth. It is expressed as a value in cycles per second, more usually known as hertz (abbreviated to Hz). For whole-body vibration, the frequencies thought to be important range from 0. 5 Hz to 80 Hz. However, because the risk of damage is not equal at all frequencies a frequency-weighting is used to represent the likelihood of damage from the different frequencies. As a result, the weighted acceleration decreases when the frequency increases. For whole-body vibration, two different frequency weightings are used. One weighting (the Wd weighting) applies to the two lateral axes: x and y, and another (the Wk weighting) applies to the vertical, z-axis vibration

Both parameters A(8) and VDV are defined in ISO 2631 -1: 1997 The vibration directive allows for two vibration assessment methods: • the daily exposure, A(8) - the continuous equivalent acceleration, normalised to an 8 hour day, the A(8) value is based on root-meansquare averaging of the acceleration signal and has units of m/s²; and • the vibration dose value (VDV) is a cumulative dose, based on the 4 th root-meanquad of the acceleration signal with units of m/s 1. 75

ISO 2631 -1: 1997 Mechanical vibration and shock – Evaluation of human exposure to whole-body vibration – Part 1: General requirements

Whole Body Vibration a daily exposure action value of 0. 5 m/s² (or, at the choice of the EC Member State, a vibration dose value of 9. 1 m/s 1. 75); • a daily exposure limit value of 1. 15 m/s² (or, at the choice of the EC Member State, a vibration dose value of 21 m/s 1. 75);

Human exposure to whole-body vibration should be evaluated using the method defined in International Standard ISO 2631 -1: 1997 and detailed practical guidance on using the method for measurement of vibration at the workplace is given in EN 14253: 2003.

The root-mean-square (r. m. s) vibration magnitude is expressed in terms of the frequency-weighted acceleration at the seat of a seated person or the feet of a standing person (see Annex B), it is expressed in units of metres per second squared (m/s²). The r. m. s vibration magnitude represents the average acceleration over a measurement period. It is the highest of three orthogonal axes values (1. 4 awx, 1. 4 awy or awz) that is used for the exposure assessment.

The vibration dose value (or VDV) provides an alternative measure of vibration exposure. The VDV was developed as a measure that gives a better indication of the risks from vibrations that include shocks. The units for VDV are metres per second to the power 1. 75 (m/s 1. 75), and unlike the r. m. s vibration magnitude, the measured VDV is cumulative value, i. e. it increases with measurement time. It is therefore important for any measurement of VDV to know the period over which the value was measured. It is the highest of three orthogonal axis values (1. 4 VDVwx, 1. 4 VDVwy or VDVwz) that is used for the exposure assessment

Any questions? Links to information including vibration databases on occupational vibration available at: http: //www. consultnet. ie/vibration. htm Also for guidance & solutions see: www. hse. gov. uk/vibration Pusat K 3 ©

1. 2. 3. 4. 5. 6. 7. Gather Required Equipment VI-400 Pro Advanced Vibration Analyzer Hand-Arm Accelerometer with Cable Hose Clamp and Mounting Block USB Computer Interface Cable IBM-compatible PC with USB Port Quest. Suite® Professional II (QSP II) Application Software CD