nmelone/THE-Henry-Pump
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Patrick McDonagh
2018-05-22 13:18:32 -05:00
parent 67d6ad76a5
commit 7838f0e056
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28
Utilities/cabledrop.py Normal file
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from math import sqrt
current = 10.4 # Amps
temperature = 250.0 # degress F
k20 = 10.37 # 1.26 / 1000.0 # ohms of 1 circular mil foot of conductor
circular_mils = 10384.0 # cross-sectional area in circular mils of conductor
alpha_copper = 0.00393
alpha_aluminum = 0.00330
def voltage_drop(length, current, temperature, k75, circular_mils, alpha):
return sqrt(3) * k20 * (1.0 + alpha * ((5.0 / 9.0) * (temperature - 32.0) - 20.0)) * length * current / circular_mils
def calc_voltage_needed(input_voltage, voltage_drop):
return input_voltage + voltage_drop
motor_input_voltage = 380.0
print("---")
for x in [1000.0, 2000.0, 3000.0, 4000.0, 5000.0, 6000.0, 7000.0, 8000.0, 9000.0, 10000.0]:
v_dropped = voltage_drop(x, current, temperature, k20, circular_mils, alpha_copper)
v_output = calc_voltage_needed(motor_input_voltage, v_dropped)
print("Length: {}".format(x))
print("Voltage Drop: {} V".format(round(v_dropped, 3)))
print("Output Voltage: {} V".format(round(v_output, 3)))
print("Motor Input Voltage {} V".format(round(motor_input_voltage, 3)))
print("---")

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Utilities/encoder.py Normal file
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"""Encoder functions."""
MAX_RPM = 1200.0
def pulse_freq(rpm, pulses_per_rev):
"""Calculate the pulse frequency."""
rotations_per_second = rpm / 60.0
pulses_per_second = rotations_per_second * pulses_per_rev
return pulses_per_second
if __name__ == '__main__':
for x in range(0, 101):
rpm = MAX_RPM * (x * 0.01)
pulse_freq_at_rpm = pulse_freq(rpm, 6000)
print("{}\t\t{}".format(rpm, round(pulse_freq_at_rpm / 1000000.0, 4)))
last_freq_at_maxrpm = 0.0
for pulses_per_rev in range(0, 65536):
freq_at_maxrpm = pulse_freq(MAX_RPM, pulses_per_rev)
if last_freq_at_maxrpm < 500000.0 and freq_at_maxrpm >= 500000.0:
print("500 kHz at {}".format(pulses_per_rev))
exit()
last_freq_at_maxrpm = freq_at_maxrpm

303
Utilities/henrypump.py Normal file
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"""Compute various values for THE Henry Pump."""
from math import sqrt
import matplotlib.pyplot as plt
# GLOBAL PARAMETERS
g_dt = 0.050 # seconds
g_thread_pitch = 0.5906
g_accel_time = 1.0 # seconds
g_decel_time = 1.0 # seconds
g_stroke_length = 60.0 # inches
g_upper_offset = 9.0 # inches
g_lower_offset = 16.0 # inches
g_motor_full_speed_hz = 120.0 # Hz
g_motor_full_speed_rpm = 1200.0 # RPM
g_run_speed = 120.0 # Hz
MAX_NUT_ENDLOAD = 11000.0 # pounds
FLUID_GRADIENT = 0.43733 # PSI/ft
pump_constants = {
0.625: 0.046,
0.75: 0.066,
0.9375: 0.117,
1.0625: 0.132,
1.125: 0.148,
1.25: 0.182,
1.5: 0.262,
1.75: 0.357,
1.78125: 0.370,
2.0: 0.466,
2.25: 0.590,
2.5: 0.728,
2.75: 0.861,
3.75: 1.640,
4.75: 2.630
}
fluid_load_constants = {
1.0625: 0.384,
1.25: 0.531,
1.5: 0.765,
1.75: 1.041,
2.0: 1.36,
2.25: 1.721,
2.5: 2.125,
2.75: 2.571
}
def _ftlb_to_nm(ftlb):
"""Convert ft-lbs to n-m."""
return ftlb / 0.73756
def _nm_to_ftlb(nm):
"""Convert n-m to ft-lbs."""
return nm * 0.73756
def max_production(pump_size, strokes_per_minute, stroke_length):
"""Calculate the maximum production capabilities of a pump at a speed."""
try:
return pump_constants[pump_size] * strokes_per_minute * stroke_length
except KeyError:
print("No pump constant for that size pump.")
def end_load(pump_size, depth, strokes_per_minute, stroke_length):
"""Calculate the end load on the nut."""
try:
fluid_load_constant = fluid_load_constants[pump_size]
return depth * fluid_load_constant * (FLUID_GRADIENT / 0.433)
except KeyError:
print("No fluid load constant for that size pump.")
def max_producing_depth(pump_size):
"""Calculate the maximum producing depth."""
try:
fluid_load_constant = fluid_load_constants[pump_size]
return MAX_NUT_ENDLOAD / (fluid_load_constant * (FLUID_GRADIENT / 0.433))
except KeyError:
print("No fluid load constant for that size pump.")
def voltage_drop(length, current, temperature, circular_mils, alpha):
"""Calculate the voltage drop in the wire."""
k20 = 10.37 # 1.26 / 1000.0 # ohms of 1 circular mil foot of conductor
return sqrt(3) * k20 * (1.0 + alpha * ((5.0 / 9.0) * (temperature - 32.0) - 20.0)) * length * current / circular_mils
def calc_voltage_needed(input_voltage, voltage_drop):
"""Calculate the voltage needed given an input voltage and a voltage drop."""
return input_voltage + voltage_drop
def print_voltage_drops():
"""Print values for voltage drop at distances."""
current = 10.4 # Amps
temperature = 250.0 # degress F
circular_mils = 10384.0 # cross-sectional area in circular mils of conductor
alpha_copper = 0.00393
motor_input_voltage = 380.0
print("---")
for x in [400.0, 1000.0, 2000.0, 3000.0, 4000.0, 5000.0, 6000.0, 7000.0, 8000.0, 9000.0, 10000.0]:
v_dropped = voltage_drop(x, current, temperature, circular_mils, alpha_copper)
v_output = calc_voltage_needed(motor_input_voltage, v_dropped)
print("Length: {}".format(x))
print("Voltage Drop: {} V".format(round(v_dropped, 3)))
print("Output Voltage: {} V".format(round(v_output, 3)))
print("Motor Input Voltage {} V".format(round(motor_input_voltage, 3)))
print("---")
def time_for_freq_change(freq_delta, np_hz, ramp_time):
"""Calculate the time required for a frequency change."""
return (freq_delta / np_hz) * ramp_time
def dist_for_freq_change(freq_delta, ramp_time, np_hz, np_rpm, thread_pitch):
"""Calculate the distance required for a frequency change."""
time_required = time_for_freq_change(freq_delta, np_hz, ramp_time)
return 0.5 * time_required * freq_delta * (np_rpm / np_hz) * (1.0 / 60.0) * thread_pitch
def time_for_uniform_freq(freq, distance, np_hz, np_rpm, thread_pitch):
"""Calculate the time required to move a distance at a constant frequency."""
return distance / (freq * (np_rpm / np_hz) * (1.0 / 60.0) * thread_pitch)
def calculate_stroke_time(stroke_length, upper_offset, lower_offset, run_frequency, accel_time, decel_time, nameplate_hz=120.0, nameplate_rpm=1200.0, thread_pitch=0.5406):
"""Calculate the time it takes to make a full stroke."""
ramp_up_time = time_for_freq_change(run_frequency, nameplate_hz, accel_time)
ramp_up_dist = dist_for_freq_change(run_frequency, accel_time, nameplate_hz, nameplate_rpm, thread_pitch)
ramp_down_time = time_for_freq_change(run_frequency, nameplate_hz, decel_time)
ramp_down_dist = dist_for_freq_change(run_frequency, decel_time, nameplate_hz, nameplate_rpm, thread_pitch)
run_dist = stroke_length - (lower_offset + upper_offset + ramp_up_dist + ramp_down_dist)
run_time = time_for_uniform_freq(run_frequency, run_dist, nameplate_hz, nameplate_rpm, thread_pitch)
stroke_time = 2.0 * (ramp_up_time + run_time + ramp_down_time)
return stroke_time
def print_stroke_times():
"""Print the required frequency for different SPM's with different ramp times."""
for ramp_i in [0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0]:
print("-----")
print("Ramp Rate: {}".format(ramp_i))
for hz_i in [20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 110.0, 120.0]:
spm = 60 / calculate_stroke_time(g_stroke_length, g_upper_offset, g_lower_offset, hz_i, ramp_i, ramp_i)
print("Freq: {} Hz., SPM: {}".format(hz_i, spm))
def sim(run_freq, dt, num_strokes, stroke_length, accel_time, decel_time, upper_offset, lower_offset, motor_full_speed_hz, motor_full_speed_rpm, thread_pitch, use_average=False):
"""Run the main simulation loop."""
strokes = 0
time_to_turnaround = time_for_freq_change(run_freq, motor_full_speed_hz, decel_time)
# time_to_turnaround = decel_time - (motor_full_speed_hz - run_freq) * decel_time / motor_full_speed_hz
print("Turn Time: {} s.".format(time_to_turnaround))
distance_to_turnaround = dist_for_freq_change(run_freq, decel_time, motor_full_speed_hz, motor_full_speed_rpm, thread_pitch)
# distance_to_turnaround = 0.5 * time_to_turnaround * run_freq * (motor_full_speed_rpm / motor_full_speed_hz) * (1.0 / 60.0) * thread_pitch
print("Turn Distance: {} in.".format(distance_to_turnaround))
upper_turnaround_target = stroke_length - (upper_offset + distance_to_turnaround)
upper_offset_target = stroke_length - upper_offset
lower_turnaround_target = lower_offset + distance_to_turnaround
print("--")
print("Targets")
print("-")
print("Lower Offset: {} in.".format(lower_offset))
print("Turnaround Target: {} in.".format(upper_turnaround_target))
print("Upper Offset: {} in.".format(upper_offset_target))
print("Lower Turnaround Target: {} in.".format(lower_turnaround_target))
print("--")
position = lower_offset
time = 0.0
direction = 1
starting_speed = 0.0 # Hz
speed = starting_speed
last_speed = speed
speed_array = []
position_array = []
time_array = []
stroke_part = -1
max_position = 0
min_position = stroke_length
while strokes != num_strokes:
last_speed = speed
if direction == 1:
if position < upper_turnaround_target:
# below offset and turnaround, ramp up to setpoint, then run at setpoint
if stroke_part != 0:
stroke_part = 0
print("{} - {}".format(stroke_part, position))
if speed < run_freq:
speed += (motor_full_speed_hz / accel_time) * dt
if speed > run_freq:
speed = run_freq
elif position >= upper_turnaround_target:
# above turnaround distance, ramp to 0 and change direction
if stroke_part != 1:
stroke_part = 1
print("{} - {}".format(stroke_part, position))
if speed > 0:
speed += -1.0 * (motor_full_speed_hz / decel_time) * dt
if speed <= 0:
speed = 0
direction = -1
elif direction == -1:
if position > lower_turnaround_target:
# above offset and rampdown distance, ramp up to setpoint (negative), then run at setpoint
if stroke_part != 2:
stroke_part = 2
print("{} - {}".format(stroke_part, position))
if speed > (-1.0 * run_freq):
speed += -1.0 * (motor_full_speed_hz / accel_time) * dt
if speed < (-1.0 * run_freq):
speed = -1.0 * run_freq
elif position <= lower_turnaround_target:
# below turnaround distance, ramp to 0 and change direction
if stroke_part != 3:
stroke_part = 3
print("{} - {}".format(stroke_part, position))
if speed < 0:
speed += 1.0 * (motor_full_speed_hz / decel_time) * dt
if speed >= 0:
speed = 0
direction = 1
strokes += 1
if use_average:
delta_x = (speed + last_speed) / 2.0 * (motor_full_speed_rpm / motor_full_speed_hz) * (dt / 60.0) * thread_pitch
else:
delta_x = speed * (motor_full_speed_rpm / motor_full_speed_hz) * (dt / 60.0) * thread_pitch
position += delta_x
time += dt
speed_array.append(speed * (motor_full_speed_rpm / motor_full_speed_hz))
position_array.append(position)
time_array.append(time)
# print("Time: {} sec., Position: {} in., Speed: {}".format(time, position, speed * (motor_full_speed_rpm / motor_full_speed_hz)))
# sleep(dt)
if stroke_part == 1:
max_position = max([max_position, position])
if stroke_part == 3:
min_position = min([min_position, position])
SPM = 60.0 / (time / strokes)
# max_position = max(position_array)
# min_position = min(position_array)
print("Max: {}, Min: {}".format(max_position, min_position))
print("SPM: {}".format(SPM))
fig, ax1 = plt.subplots()
ax1.plot(time_array, speed_array, "b-", linewidth=2)
# ax1.plot(position_array, speed_array, "b-", linewidth=2)
ax1.set_ylabel("RPM", color="b")
ax2 = ax1.twinx()
ax2.plot(time_array, position_array, "r-", linewidth=2)
ax2.set_ylabel("in.", color="r")
fig.tight_layout()
ax1.grid(color='black', linestyle='--', linewidth=1)
plt.show()
def calc_travel_time(distance, speed_rpm, thread_pitch):
"""Calculate the time it takes to travel a distatnce at a speed."""
rotations_needed = distance / thread_pitch
minutes_for_full_travel = rotations_needed / speed_rpm
seconds_for_full_travel = minutes_for_full_travel / 60.0
return seconds_for_full_travel
def calc_theoretical_production(stroke_length, spm, pump_diameter):
"""Calculate the maximum production for a given stroke length and speed."""
try:
return stroke_length * pump_constants[pump_diameter] * spm
except IndexError:
print("Cannot find pump constant for that diameter.")
return False
if __name__ == '__main__':
sim(g_run_speed, g_dt, 5, g_stroke_length, g_accel_time, g_decel_time, g_upper_offset,
g_lower_offset, g_motor_full_speed_hz, g_motor_full_speed_rpm, g_thread_pitch, use_average=False)

58
Utilities/testVaconCPPPO.py Normal file
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from cpppo.server.enip.get_attribute import proxy_simple
import logging
class VFD_COMM(proxy_simple):
'''A simple (non-routing) CIP device with one parameter with a
shortcut name: 'A Sensor Parameter' '''
PARAMETERS = dict(proxy_simple.PARAMETERS,
at_reference = proxy_simple.parameter('@0x2A/1/3', 'BOOL', "I/O"),
net_ref = proxy_simple.parameter('@0x2A/1/4', 'BOOL', "I/O"),
drive_mode = proxy_simple.parameter('@0x2A/1/6', 'SINT', "mode"),
speed_actual = proxy_simple.parameter('@0x2A/1/7', 'INT', "Hz"),
speed_ref = proxy_simple.parameter('@0x2A/1/8', 'INT', "Hz"),
torque_actual = proxy_simple.parameter('@0x2A/1/0x0B', 'INT', "Nm"),
torque_ref = proxy_simple.parameter('@0x2A/1/0x0C', 'INT', "Nm"),
speed_scale = proxy_simple.parameter('@0x2A/1/0x16', 'SINT', "Nm"),
torque_scale = proxy_simple.parameter('@0x2A/1/0x18', 'SINT', "Nm"),
ref_from_net = proxy_simple.parameter('@0x2A/1/0x1D', 'BOOL', "I/O")
)
class Vacon100:
def __init__(self, ip_address):
self.ip_address = ip_address
self.cpppo_proxy = VFD_COMM(ip_address)
def read_ACDCDriveOBj(self):
try:
vals_wanted = [
"At Reference",
"Net Ref",
"Drive Mode",
"Speed Actual",
"Speed Ref",
"Torque Actual",
"Torque Ref",
"Speed Scale",
"Torque Scale",
"Ref From Net"
]
params = self.cpppo_proxy.parameter_substitution(vals_wanted)
vals = self.cpppo_proxy.read(params)
val_list = list(vals)
for x in range(0, len(vals_wanted)):
print("{}: {}".format(vals_wanted[x], val_list[x][0]))
return(vals)
except Exception as exc:
logging.warning("Access to remote CIP device failed: %s", exc)
self.cpppo_proxy.close_gateway(exc=exc)
raise
def main():
vacon_100 = Vacon100("192.168.1.11")
print(vacon_100.read_ACDCDriveOBj())
if __name__ == '__main__':
import sys
sys.exit(int(main() or 0))