Chapter 10: ANTHROPOMETRY

1
Chapter 10 ANTHROPOMETRY
Anthropometric data permit the designer to design
to fit the individual (to have a design to fit
most of the workforce)
Its a Greek word made up of two words Anthropos
(Man) Metrein (To measure) explains how people
vary
2
FIT THE JOB TO THE PERSON

• 1. Variability
• As we discussed previous slide, metrein explains
  how people vary in
• Initiative
• Needs
• Intelligence
• Imagination
• Age
• Upper back strength..

3
FIT THE JOB TO THE PERSON
2. Selection Versus Job Modification

• Assume a box of 20lbs to be lifted
• Two Alternatives
• Selection select the strongest person
• Job Modification Modify environment so that
  every one could do it
• Dont forget the bottom line Your Resources

4
FIT THE JOB TO THE PERSON
3. Exclude as few as possible

• Workplace should be designed to exclude as few
  people as possible.
• The percent of people to exclude depend on the
  tradeoff between the seriousness of exclusion
  versus the cost of inclusion

5
POPULATION VALUES
1. Dimensions (Figure 10.1) (Should not have the
basis as personal dimensions) Some typical
examples are that on an average Americans are
taller than Chinese or Japanese People Also, two
characteristics cannot be mixed like.. If a
person is short than that does not imply that she
has less intelligence too or vice versa.
6
POPULATION VALUES
2. Strengths On average, females have 63 of the
isometric strength of males but this ratio is
dependent on part of the body as well In
summary 1. The leg is approximately three times
stronger than the arm 2. Direction of force is
very important 3. There seems to be not much
difference in right and left legs
7
POPULATION VALUES
3. Other Characteristics
Weight and Center of Mass can be predicted from
standard tables
4. Anthropometric Sources See reference books and
MODAPTS
8
STATISTICAL CALCULATIONS

• 1. Normal Distribution (Cannot be generalized
  but can have a representative sample)
• Most useful single predictor is population mean
• Absolute variability of a population is given by
  the standard deviation
• Relative variability of a population is given by
  the coefficient of variation.

9
STATISTICAL CALCULATIONS
Designing for a Population / Person 1.
Population or Person 2. Sizes (Shoe size
example) variability, no. of sizes)