Add simple model for estimation of fuel consumption #7
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kdemmich
commented
Apr 22, 2025
kdemmich
commented
- based on Direct Power Method as described in ITTC
- only considers added resistance due to wind
- can only operate at fixed working point of 75% SMCR and corresponding speed
- solve dimension problem - arccos argument-out-of-range error in ship.py
DeprecationWarnings
…n calculation of apparent wind variables
| if config.SHIP_TYPE == 'SAL': | ||
| raise NotImplementedError('Ship type SAL is not yet supported!') | ||
| if config.BOAT_TYPE == 'direct_power_method': | ||
| print('Using direct power method') |
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Use logger instead of print.
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| if config.ALGORITHM_TYPE == 'speedy_isobased': | ||
| ship = ConstantFuelBoat(config) | ||
| else: |
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If we don't use "else" and the user sets BOAT_TYPE to something else than speedy_isobased, the ship object will be overridden. This behavior is not intended, is it?
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Nope. Is fixed now.
WeatherRoutingTool/ship/ship.py
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| ship_params - ShipParams object containing ship parameters like power consumption and fuel rate | ||
| """ | ||
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| ship_path: str # path to ship configuration file |
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ship_path is never set or used.
WeatherRoutingTool/ship/ship.py
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| def __init__(self, config): | ||
| super().__init__(config) | ||
| config_obj = ShipConfig(file_name=config.CONFIG_PATH) |
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If a user has specified the configuration via a dictionary, the ShipConfig will not be initialized correctly. Instead, an error will be thrown.
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| for i_coord in range(0, n_coords): | ||
| wave_direction.append( | ||
| self.approx_weather(weather_data['VMDR'], lats[i_coord], lons[i_coord], time[i_coord])) |
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Why is i_coord used to index lons, although i_coord ranges from 0 to len(lats)?
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The arrays lats and lons have the same length by design as they store the latitude and longitude values at every routing step.
WeatherRoutingTool/ship/ship.py
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| estimates power & fuel consumption based on the so-called Direct Power Method | ||
| The following approximations are used: | ||
| - a fixed working point of 70% SMCR power and an average ship speed is assumed |
WeatherRoutingTool/ship/ship.py
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| self.calculate_head_wind_coeff() | ||
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| logger.info(form.get_log_step('The boat speed provided is assumed to be the speed that corresponds ' | ||
| 'to 70% SMCR power.')) |
