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task library
built templatefundamental-calculationswith-tool

Distance Attenuation

Calculates the free-field sound pressure level at a target distance from a known reference level and distance. The template uses inverse-square geometric spreading, expressed as L2 = L1 - 20 log10(r2/r1), for deterministic first-pass acoustic propagation checks.

inputs

3 fields

context

3 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

3 inputs to 3 scored outputs

  • reference_spl_db

    float

    Sound pressure level at the reference distance

    40 to 130dB

  • reference_distance_m

    float

    Reference distance from the point source

    0.5 to 50m

  • target_distance_m

    float

    Target distance from the point source

    1 to 500m
distance_ratiotol 0.03

Distance ratio r2/r1

attenuation_dbtol 0.03

Geometric spreading attenuation

target_spl_dbtol 0.03

Sound pressure level at the target distance

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for nearby plant equipment

all fields visible
all_givenmedium

All parameters given across plant and industrial noise scenarios

all fields visible
all_givenhard

All parameters given for longer-distance environmental noise checks

all fields visible

scenario bands

Archetype Atlas

plant_room_equipment

2 contexts

Mechanical plant item assessed at occupied-area setback

reference_spl_db75 to 100
reference_distance_m1 to 3
target_distance_m5 to 50

hospital-plant-room / commercial-rooftop-plant

industrial_fan

2 contexts

Industrial fan or blower assessed at site boundary

reference_spl_db85 to 115
reference_distance_m1 to 10
target_distance_m25 to 250

water-treatment-plant / industrial-process-building

construction_noise

2 contexts

Temporary construction equipment assessed at a receiver

reference_spl_db80 to 120
reference_distance_m5 to 15
target_distance_m20 to 500

urban-construction-site / rail-corridor-works

rendered task

Generation Preview

water-treatment-plant-industrial-fan-preview

difficulty
hard
visibility
all_given
archetype
industrial_fan
site context
water-treatment-plant
instruction excerptdistance-attenuation_calc.py

visible fields

  • reference_spl_db85 to 115 dB
  • reference_distance_m1 to 10 m
  • target_distance_m25 to 250 m

withheld schema

distance_ratioattenuation_dbtarget_spl_db
Industrial fan or blower assessed at site boundary. water-treatment-plant. Required outputs: distance_ratio, attenuation_db, target_spl_db