Week 4 Lectures Flashcards
(16 cards)
Steps to address ergonomic issues in the workplace
Planning
Assessing Need/Benchmarking
Gathering background information
Risk identification
Risk assessment
Risk contorl
Evaluation
What is the ACE code of conduct
Integrity, Impartiality, Respect
* The interest, safety and welfare of those in receipt of
your services or affected by those services is
paramount at all times
* Safeguard the interests of participants, and ensure
that your work is in keeping with the highest
standards of scientific integrity
* Maintain confidentiality
How can we gather background information for an ergo report?
Work Analysis
Job Demands Analysis
Task Analysis
Observation
SPARK
Walkthrough talkthrough
SHELL
Process flow charts
Time and motion studies
Link analysis
MONOTASK vs MULTITASK
- Monotask – one task with the same
movement patterns for the whole duty time - Multitask – more than one task with the same movement patterns for the whole duty time
Check and bag groceries: check + bag
Repetitive vs non-repetitive tasks
recovery periods
Repetitive tasks
- Characterized by cycles with “technical/mechanical” actions
* Non-repetitive tasks
- Characterized by cycles of mechanical actions that are
not repetitive
Recovery periods
- Characterized by non-movement tasks
(examination/inspection)
How should you sample a short cycle mono task vs multitask
Monotask
* 15-minute samples of whole task (3 cycles)
Multitask
* 10-minute samples of each task (max 4 tasks)
Video analysis, watching in real time, look for averages/typical work but also maximum loads/ degrees of motion
How should you sample a short cycle mono task vs multitask
Monotask
* 15-minute samples of whole task (or at least 2 cycles whichever is longer)
Multitask
* 10-minute samples of each task (or at least 2 cycles whichever is longer) (max 4 tasks)
How should you sample non-cyclical tasks (no duties/tasks repeat in a systematic way within 1 hour)
– Monotask
* At least 3 5-minute samples at different times
of the day Bao, S. et al. (2006)
– Multitask
* At least 2 5-minute samples for each task (<4)
at different times of the day Bao, S. et al. (20
HIERARCHICAL TASK DESCRIPTION
Every system (worker) has specific functions (aka duties) which must be carried out to meet the system’s objectives
Duties are made up of TASKS
Some tasks will have related SUBTASKS
Some sub-tasks may have related ACTIVITIES
Cycle time
Cycle time: The time required to complete a sequence of technical actions that repeats itself in the same way
Exposure
How long does the worker perform the task each day
EFFECTIVE DURATION
length of time each risky or technical action takes within a cycle
DUTY CYCLE
Duty cycle (DC) is the percentage of time an
individual is engaged in the effort
(effective duration x frequency) / cycle time
For example, if a worker performs 10 thumb push efforts
within each 65-s cycle and each effort is 0.55 s in duration
* then = DC is (10 efforts/cycle × 0.55 s/effort)/65 s per cycle,
or DC = 0.085 (8.5% of each cycle).
Calculate duty cycle using class example
(effective duration x frequency ) / total cycle time = duty cycle
What is captiv
Software for recording, synchronizing and analyzing video
Video-based system
Code for various actions
Can see how many times they did a certain activity
Task is broken down into subtasks
Task can also be coded for posture
IMU
inertial measurement unit
Device that picks up acceleration relative to each other
I.e. relative to gravity or to one another
Gives you data around joint movements,
Data gets synced up to video
