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“Uncertainty-noise” Le Mans
23
Acoustique
&
Techniques n° 40
The seductor : his relations to others are oriented to seduction.
He wants to be loved. This actor is very often charismatic and
fascinating. He wants to be an idol and you must be his fan.
The humanist : his relations to others are oriented to respect.
He considers other persons as equal to himself.
Phase 2 : formulating an offer and contracting
When the consultant has identified the problem, the needs and
the various actors, it is time to formulate an offer.
The content of the offer needs to be the best answer to the
needs of the client taking into account the personality and the
objectives of the different actors.
- For instance, if a client is obliged to “conformity to regulation”
measurements, the content must assure the client that all
legal aspects are included in the offer. The price will probably
be a key factor.
- As another example, if a client needs an study that will
increase his ego, nice acoustical mapping and imaging must
be included in the offer.
- etc.
The price of the acoustical work plays of course an important
role. From that point of view, the offer can be done in two
ways :
- The price based on the “offer” : the consultant establishes
first a content (or the need is very precise in terms of contents
like for some quotations). He calculates his costs (time spent
x hourly rate + specific costs) to realize the work and adds
a margin to it.
- The price based on the “demand” : the consultant fixes the
sell price independently of the content of his offer. When he
fixes the price, the consultant tries to determine the maximum
above which the client will not buy it. He will also determine
the minimum price under which the client will not consider his
offer as credible to respond to the need.
Both ways of evaluating the price of an offer have their own
advantages and depend on the context and the personality of
the actors and especially the decider. In practice both methods
are very often interdependent and used together.
Phase 3 : Realizing the work (measurements,
simulations, recommendations, solutions, follow-up
and receipt of the solutions, …)
The quality of the result will be a conjunction of the quality of
the tools used and the competence of the specialist.
It is impossible to determine a priori an uncertainty for all
acoustical problems. Each problem is specific and even inside
one project there will be no unique value for the uncertainty.
Based on his experience, the acoustical consultant can
develop some simplified schemes which will help him in globally
evaluating the uncertainties and looking which particular point
need to be investigated further.
Example of global approach of uncertainties in building
acoustics
Fig. 5 : quality: a combination of tools and competence
Fig. 6 : global approach of the uncertainties in prediction of acoustic insulation in buildings
The various sources of uncertainties in acoustic consultancy work