Нагрузки на двигатель
Tools/Инструменты > Project Settings/Настройки проекта > Travel Time/Время в пути > Engine Loads/Нагрузки на двигатель
Средние значения нагрузок на двигатель во время простоя, ожидания, выгрузки и работы с троллейным электроприводом могут быть вычислены из бортовых систем управления карьерным самосвалом (например, VIMS, KOMTRAX и пр.).
Ускорение
Tools/Инструменты > Project Settings/Настройки проекта > Travel Time/Время в пути > Acceleration/Ускорение
Пределы ускорения измеряются в «километры в час в секунду». Значения по умолчанию устанавливаются с заниженным стандартом, их следует обновить в соответствии с фактическими наблюдениями в процессе эксплуатации.
Для измерения ускорения и замедления самосвала пронаблюдайте за его работой с грузом и без в течение нескольких циклов, обращая внимание на:
- время (секунды) резкого торможения с 10 км/ч до останова,
- время (секунды) резкого ускорения из состояния останова до 10 км/ч.
Далее, значение максимального ускорения/замедления следует заменить на результат деления скорости (10 км/ч) на время (измеренное в секундах).
При измерении пределов торможения, узнайте у операторов оптимальные методы сокращения просыпания груза и эксплуатации дорог.
Traction
Tools > Project Settings > Travel Time > Traction
The coefficient of traction is the maximum percentage of the normal component of the truck's weight on the driven axle(s) which can be used to accelerate or decelerate the truck. Braking reliance on traction applies another coefficient, which specifies how close the truck driver will approach skidding when decelerating. More traction means that a truck can use faster acceleration and braking without skidding. If traction is so low that a truck would spin its wheels on the ramp, then Haul Infinity will report a “steep segment” error.
Usable Rimpull = Machine Weight * Coefficient of Traction
Coefficient of traction factors (Caterpillar Performance Handbook, 2013)
Adjust the coefficient of traction to match the conditions on your site.
Retarder
Tools > Project Settings > Travel Time > Retarder
Applying brakes with too much force can cause premature brake failure, reduce tyre life expectancy, increase road maintenance costs and/or cause strut damage from digging potholes in the road surface. The default max use of retarder is set to 70% as a conservative estimate of safe operating behaviour. Consider your truck types and maximum ramp gradients when setting the max use of retarder.
Rolling Resistance
Tools > Project Settings > General > Network Defaults
Rolling resistance is the force (as a percentage of gross vehicle weight) required to propel a vehicle at constant speed over level terrain, caused by the tire climbing up out of the depression created by its own load.
Typical rolling resistance factors (Caterpillar Performance Handbook, 2013)
TKPH Constants
Refer to the TKPH rating tables provided by your tyre manufacturer.
Trolley Assist Curves
Rimpull is the total linear force that a vehicle can exert on the ground. Also called “tractive effort,” it is the axle torque divided by the distance from the axle to the road surface.
Power (N*m/s) = Rimpull (N) * Velocity (m/s)
Follow these steps to create a trolley assisted rimpull curve.
- Find the rated power of the truck engine
- Find the power available to the truck in trolley-assist
- In Haul Infinity, copy the Rimpull curve and paste to excel
- In Excel, factor the rimpull points by the ratio of k = (trolley rated power) / (oem power)
- Copy the data points from excel
- Paste them into the Trolley Assist curve for the truck.
Take careful note to use the right units if doing conversions. Haul Infinity uses kilograms of force (kgF) as the default unit of rimpull measurement.
Кривые расхода топлива
Кривые расхода топлива карьерного самосвала берутся из справочников производителя. Их требуется обновить в программе на основе измерений с бортовых систем техники.
Single Lanes
Haul Infinity 3.4 does not support traffic simulations. Truck fleet allocation is calculated on the assumption of a continuous flow of traffic between the source and destination.
Single lanes can be approximated by placing a stop sign at the entry points to the single lane, with a delay equal to the estimated wait time.
For full mine site traffic simulation, Alastri recommends running Simio in conjunction with Haul Infinity. Visit www.simio.com for more information about discrete event simulation.
Time and Motion Studies
Haul Infinity cycle times can be calibrated with time and motion studies in the field.
- Spot time at loader
- Digger swing time
- Loaded travel time
- Spot at dump time
- Dump time
- Unloaded travel time
To compare partial travel times, place waypoints on the Haul Infinity network and subtotal the segment travel time from the Segments tab.
