dynoWT1x is the interface program to a BK Precision 8500 and variable frequency drive (vfd). This allows the program to control the RPM of the dynomometer and the load the BK 8500 is applying.
sudo apt-get install libjson-c-dev libmosquitto-dev mosquitto mosquitto-clients libmodbus-dev
make
The make will create two directories, bin/ and doc/ if necessary and then attempt to
compile dynoWT1x.c into bin/dynoWT1x.
contains an array test configuration structures. The structure contains:
typedef struct {
char *label;
int DYNO_RPM_START; /* RPM */
int DYNO_RPM_END; /* RPM to end at */
int DYNO_RPM_STEP; /* RPM step size */
int DYNO_RPM_WAIT; /* seconds to wait for dyno to reach RPM */
int VOLTAGE_START; /* milliVolts */
int VOLTAGE_END; /* milliVolts to end at */
int VOLTAGE_STEP; /* milliVolts step size */
int VOLTAGE_WAIT; /* milliseconds to wait for load to reach milliVolts */
int SAMPLING_DURATION; /* seconds */
int SAMPLING_HERTZ; /* samples per second */
char *MQTT_HOST;
char *MQTT_TOPIC;
} TEST_CONFIG;
There are just two items that can be overriden from the command line, MQTT_HOST, and MQTT_TOPIC. That way the operator cannot snafu your test but may send the moquitto output to a different server.
I have three sample configs and an empty config in the file. Adjust the parameters to be suitable for your use.
Make sure that DYNO_RPM_START is smaller than DYNO_RPM_END unless you want to start at higher speeds
and get slower. To do that make DYNO_RPM_STEP a negative number.
All VOLTAGE_stuff is in milliVolts and milliseconds.
SAMPLING_HERTZ must be 1,2,4,5,8, or 10. These are all small factors of 1 million. If you use
SAMPLING_HERTZ of 5 and SAMPLING_DURATION of 2 then you should get 10 samples at a particular voltage-rpm combination.
Do not forget to run make
| switch | Required/Optional | argument | description |
|---|---|---|---|
| --help | OPTIONAL | (none) | displays help and exits |
| --verbose | OPTIONAL | (none) | sets verbose mode |
| --verbose-level | OPTIONAL | number | sets verbose level above 1 |
| --override | OPTIONAL | (none) | must be used before any switches below |
| --daq-device | OPTIONAL | device name | Only use when the software does not autmatically conncect. |
| --mqtt-topic | OPTIONAL | topic | mqtt topic |
| --mqtt-host | OPTIONAL | qualified host | mqtt host operating mqtt server |
| --mqtt-port | OPTIONAL | number | default is 1883 |
| --mqtt-user-name | OPTIONAL | user login | mqtt server may require this |
| --mqtt-password | OPTIONAL | password | mqtt server may require this |
| --modbus-host | OPTIONAL | qualified host | modbus host operating modbus server |
| --modbus-port | OPTIONAL | number | default is 502 |
| --modbus-slave | OPTIONAL | number | default is 1 |
The first arguement is an identifier of the wind turbine. You may optionally put a path before
the id, ie. data/WT1234. This will create a csv file in the data/ folder whose name starts with WT1234_ and ends
with _stats.csv. The middle characters are the number seconds since the epoch.
The second arguement is the label of the test to be run. The label maybe as simple as 24 or 24extended or some other
string. To see the labels of all the tests hardcoded in the program run dynoWT1x --help.
The software connects to real hardware that can cause serious injury to people working in or near the hardware.
If running dynoWT1x and there is an emergency, you can Control-c. This will cause the load to be removed and the
the dynomometer to stop and return to local operator control. The hardware load
BK 8500 and the dynomometer should be powered down when changing out the wind turbine. The computer does not have to
be turned off. Do NOT turn off the computer unless there is an emergency. Try to power down the dynomometer first.
The load cell to be interfaces is a LOADSTAR. It is assumed to have the entry /dev/ttyLoadStar0. If the
entry does NOT exist or is unusable then the output will not contain load cell info.
The BK 8500 is interfaced at /dev/ttyLoad0.
If the entry does NOT exist or is unusable then the program will exit with an error message. If you have a
BK 8500 connected and know the entry name you can used the --daq-device=/dev/ttyUSB? option where you specify
the name. Remember that --override must be on the command line ahead of --daq_device
It is easiest to build MQTT_HOST and MQTT_TOPIC into each test specification.
Overriding MQTT_HOST requires --override on the command line before --mqtt-host 10.0.0.1 or
--mqtt-host=10.0.0.1 or --mqtt-host=mosquitto/server. If you leave it empty in the test spec then it will default
to localhost.
Overriding MQTT_TOPIC requires --override on the command line before --mqtt-topic someTopic.
There is NO default mqtt-topic. If the topic is missing then mqtt will not be used.
Overriding mqtt port requires --override on the command line before --mqtt-port 9966. The default mqtt-port is 1883.
Setting --mqtt-user-name requires --override on the command line before --mqtt-user-name JoeSmallMqttUser. There is
no default. Using this option is required when the mqtt server requires it.
Setting --mqtt-password requires --override on the command line before --mqtt-password MyFirstDogFido. There is
no default. Using this option is required when the mqtt server requires it.
The default sampling duration is 5 seconds. In each test specification if SAMPLING_DURATION is zero then the 5 seconds
will be used.
The default sampling rate is 1 Hertz. In each test specification if SAMPLING_HERTZ is zero then the 1 Hertz
will be used. The allowed hertz are 1, 2, 4, 5, 8, and 10. The only prime factors of 1,000,000 are 2 and 5.
Therefore the only allowed Hertz must 1 and/or some number where 2 and/or 5 are its factors. The next candidate is
16.
/* DO NOT CHANGE ANYTHING ABOVE THIS LINE */ literally means what is says.
/* SAMPLE t_config entry that can be copied used to start a new entry */
{
0, /*label*/
0, /*DYNO_RPM_START; RPM */
0, /*DYNO_RPM_END; RPM to end at */
0, /*DYNO_RPM_STEP; RPM step size */
0, /*DYNO_RPM_WAIT; seconds to wait for dyno to reach RPM */
0, /*VOLTAGE_START; milliVolts */
0, /*VOLTAGE_END; milliVolts to end at */
0, /*VOLTAGE_STEP; milliVolts step size */
0, /*VOLTAGE_WAIT; milliseconds to wait for load to reach milliVolts */
0, /* SAMPLING_DURATION; seconds */
0, /* SAMPLING_HERTZ; samples per second */
0, /*MQTT_HOST*/
0, /*MQTT_TOPIC*/
},
/* END SAMPLE */
You can copy these lines and paste them to where you need them and create a new entry from scratch.
Replace the 0 with text enclosed in ". Examples are "24", "24extreme" and "SomeLabel".
The label should be unique but this is not enforced. The program will only find the first
non-unique label.
Replace the 0 with a value desired.
Replace the 0 with a value desired. DYNO_RPM_END >= DYNO_RPM_START must be true unless you want to start
with greater RPM and then go slower.
Replace the 0 with a value desired. if DYNO_RPM_END > DYNO_RPM_START then DYNO_RPM_STEP must be a negative
number.
Replace the 0 with a value desired. This is the number of seconds to wait for the speed to completely adjust.
Replace the 0 with a value desired. This is milliVolts so 26 Volts is 26000 mV.
Replace the 0 with a value desired. This is milliVolts so 26 Volts is 26000 mV. Make sure VOLTAGE_END >= VOLTAGE_START.
Replace the 0 with a value desired. This is milliVolts so 1 Volt is 1000 mV. If VOLTAGE_START not equal VOLTAGE_END then
VOLTAGE_STEP must be NONZERO.
Replace the 0 with a value desired. This is milliseconds so 500 = 1/2 second.