ifcopenshell.api.sequence.calculate_task_duration

Module Contents

class ifcopenshell.api.sequence.calculate_task_duration.Usecase

calculate_duration_in_days(resource)

calculate_max_resource_usage_duration()

calculate_seconds_per_workday()

execute()

set_task_duration(duration)

ifcopenshell.api.sequence.calculate_task_duration.calculate_task_duration(file: ifcopenshell.file, task: ifcopenshell.entity_instance) → None

Calculates the task duration based on resource usage

If a task has labour or equipment resources assigned to it, its duration may be parametrically derived from the scheduled work of the resource. For example, a labour resource with scheduled work of 10 working days and a resource utilisation of 200% (i.e. two labour teams) will imply that the task duration is 5 working days.

If this data is not available, such as if the task has no resources, then nothing happens.

Parameters:

task (ifcopenshell.entity_instance) – The IfcTask to calculate the duration for.

Returns:

None

Return type:

None

Example:

# Add our own crew
crew = ifcopenshell.api.resource.add_resource(model, ifc_class="IfcCrewResource")

# Add some labour to our crew.
labour = ifcopenshell.api.resource.add_resource(model,
    parent_resource=crew, ifc_class="IfcLaborResource")

# Labour resource is quantified in terms of time.
quantity = ifcopenshell.api.resource.add_resource_quantity(model,
    resource=labour, ifc_class="IfcQuantityTime")

# Store the unit time used in hours
ifcopenshell.api.resource.edit_resource_quantity(model,
    physical_quantity=quantity, attributes={"TimeValue": 8.0})

# Let's imagine we've used the resource for 10 days with a
# utilisation of 200%.
time = ifcopenshell.api.resource.add_resource_time(model, resource=labour)
ifcopenshell.api.resource.edit_resource_time(model,
    resource_time=time, attributes={"ScheduleWork": "PT80H", "ScheduleUsage": 2})

# Let's imagine we are creating a construction schedule. All tasks
# need to be part of a work schedule.
schedule = ifcopenshell.api.sequence.add_work_schedule(model, name="Construction Schedule A")

# Let's create a construction task. Note that the predefined type is
# important to distinguish types of tasks.
task = ifcopenshell.api.sequence.add_task(model,
    work_schedule=schedule, name="Foundations", identification="A")

# Assign our resource to the task.
ifcopenshell.api.sequence.assign_process(model, relating_process=task, related_object=labour)

# Now we can calculate the task duration based on the resource. This
# will set task.TaskTime.ScheduleDuration to be P5D.
ifcopenshell.api.sequence.calculate_task_duration(model, task=task)