我是SimPy建模的入门者，所以我的问题的答案可能就在我的鼻子底下，但我看不到它。但是，这里有一个问题：我想用三个机床（ deckel_maho，makino，huron ）对车间进行建模。工作订单（类订单的实例）到达车间，要求以不同的（动态）顺序在每个机床中进行处理，即不同的网络工作订单具有不同的处理顺序（从外部数据文件中读取） ）。另外，这是我的问题：在一个处理中，某些机床需要两个（或多个）相同类型的工作指令。如何在SimPy中的一个操作中实现请求和共享相同资源的不同进程的这种同步？我猜想 class Order 的 run_process 方法中必须包含一些内容，但是我可以看到... 这是我的模型代码的一部分：
import random
import simpy
RANDOM_SEED = 42
T_INTER = 7 # Create an order every ~7 minutes
SIM_TIME = 20 # Simulation time in minutes
class Workshop(object):
def __init__(self, env):
self.env = env
self.deckel_maho = simpy.Resource(env, 1)
self.makino = simpy.Resource(env, 1)
self.huron = simpy.Resource(env, 1)
self.deckel_maho_queue = []
self.makino_queue = []
self.huron_queue = []
self.latest_deckel_maho_order = ''
self.latest_makino_order = ''
self.latest_huron_order = ''
def deckel_maho_process(self, order_type, cycle_time, setup_time):
setup_required = False
if order_type != self.latest_deckel_maho_order:
setup_required = True
if setup_required:
yield self.env.timeout(setup_time)
print('DeckelMaho exits setup for %s at %.2f.' % (order_type, self.env.now))
self.latest_deckel_maho_order = order_type
yield self.env.timeout(cycle_time)
print('%s exits DeckelMaho at %.2f.' % (order_type, self.env.now))
def makino_process(self, order_type, cycle_time, setup_time):
setup_required = False
if order_type != self.latest_makino_order:
setup_required = True
if setup_required:
yield self.env.timeout(setup_time)
print('Makino exits setup for %s at %.2f.' % (order_type, self.env.now))
self.latest_makino_order = order_type
yield self.env.timeout(cycle_time)
print('%s exits Makino at %.2f.' % (order_type, self.env.now))
def huron_process(self, order_type, cycle_time, setup_time):
setup_required = False
if order_type != self.latest_huron_order:
setup_required = True
if setup_required:
yield self.env.timeout(setup_time)
print('Huron exits setup for %s at %.2f.' % (order_type, self.env.now))
self.latest_huron_order = order_type
yield self.env.timeout(cycle_time)
print('%s exits Huron at %.2f.' % (order_type, self.env.now))
class Order(object):
def __init__(self, env, order_type, order_no, ws):
self.env = env
self.order_type = order_type
self.order_no = order_no
self.ws = ws
self.order_id = str(self.order_type) + str(self.order_no)
self.end_time = 0.0
dirPath = os.path.abspath('C:/Per Aage/SimPy/My Test Models')
filePath = os.path.join(dirPath, 'ProductHolons.txt')
productHolonFile = open(filePath, 'r')
productHolons = productHolonFile.readlines()
productHolonFile.close()
self.holonList = []
self.holonList = self.build_product_holon_structure(productHolons, self.holonList)
self.process = env.process(self.run_process())
def run_process(self):
op_no = '0102'
opID, altResList = self.get_operation(self.order_type, op_no, self.holonList)
op_data = altResList[0]
cycle_time = float(op_data[1])
setup_time = float(op_data[2])
op_batch = int(op_data[3])
res_queues = self.get_res_queues(altResList)
best_queue = self.evaluate_res_queues(res_queues)
print('Best Q for ', self.order_id, ': ', best_queue[0])
machine = best_queue[0]
self.enter_in_queue(machine, cycle_time, setup_time, res_queues, env)
if machine == 'DeckelMaho':
res = self.ws.deckel_maho
print('%s arrives at DeckelMaho at %.2f.' % (self.order_id, env.now))
with res.request() as request:
yield request
print('%s enters DeckelMaho at %.2f.' % (self.order_id, env.now))
yield env.process(self.ws.deckel_maho_process(self.order_type, cycle_time, setup_time))
print('%s exits DeckelMaho at %.2f.' % (self.order_id, env.now))
self.ws.deckel_maho_queue.pop(0)
#print('DeckelMaho queue at ', env.now, ': ', self.ws.deckel_maho_queue)
elif machine == 'Makino':
res = self.ws.makino
print('%s arrives at Makino at %.2f.' % (self.order_id, env.now))
with res.request() as request:
yield request
print('%s enters Makino at %.2f.' % (self.order_id, env.now))
yield env.process(self.ws.makino_process(self.order_type, cycle_time, setup_time))
print('%s exits Makino at %.2f.' % (self.order_id, env.now))
self.ws.makino_queue.pop(0)
#print('Makino queue at ', env.now, ': ', self.ws.makino_queue)
elif machine == 'Huron':
res = self.ws.huron
print('%s arrives at Huron at %.2f.' % (self.order_id, env.now))
with res.request() as request:
yield request
print('%s enters Huron at %.2f.' % (self.order_id, env.now))
yield env.process(self.ws.huron_process(self.order_type, cycle_time, setup_time))
print('%s exits Huron at %.2f.' % (self.order_id, env.now))
self.ws.huron_queue.pop(0)
#print('Huron queue at ', env.now, ': ', self.ws.huron_queue)
op_no = '0202'
opID, altResList = self.get_operation(self.order_type, op_no, self.holonList)
op_data = altResList[0]
cycle_time = float(op_data[1])
setup_time = float(op_data[2])
res_queues = self.get_res_queues(altResList)
best_queue = self.evaluate_res_queues(res_queues)
print('Best Q for ', self.order_id, ': ', best_queue[0])
machine = best_queue[0]
self.enter_in_queue(machine, cycle_time, setup_time, res_queues, env)
if machine == 'DeckelMaho':
res = self.ws.deckel_maho
print('%s arrives at DeckelMaho at %.2f.' % (self.order_id, env.now))
with res.request() as request:
yield request
print('%s enters DeckelMaho at %.2f.' % (self.order_id, env.now))
yield env.process(self.ws.deckel_maho_process(self.order_type, cycle_time, setup_time))
print('%s exits DeckelMaho at %.2f.' % (self.order_id, env.now))
self.ws.deckel_maho_queue.pop(0)
#print('DeckelMaho queue at ', env.now, ': ', self.ws.deckel_maho_queue)
elif machine == 'Makino':
res = self.ws.makino
print('%s arrives at Makino at %.2f.' % (self.order_id, env.now))
with res.request() as request:
yield request
print('%s enters Makino at %.2f.' % (self.order_id, env.now))
yield env.process(self.ws.makino_process(self.order_type, cycle_time, setup_time))
print('%s exits Makino at %.2f.' % (self.order_id, env.now))
self.ws.makino_queue.pop(0)
#print('Makino queue at ', env.now, ': ', self.ws.makino_queue)
elif machine == 'Huron':
res = self.ws.huron
print('%s arrives at Huron at %.2f.' % (self.order_id, env.now))
with res.request() as request:
yield request
print('%s enters Huron at %.2f.' % (self.order_id, env.now))
yield env.process(self.ws.huron_process(self.order_type, cycle_time, setup_time))
print('%s exits Huron at %.2f.' % (self.order_id, env.now))
self.ws.huron_queue.pop(0)
#print('Huron queue at ', env.now, ': ', self.ws.huron_queue)
# And so on....
def setup(env, t_inter):
# Create the workshop
workshop = Workshop(env)
order_sequence = ['EM2040RX', 'HISASRX', 'ES10', 'EM2040RX', 'HISASRX', 'ES10']
# Create orders
j = 0
for i in range(len(order_sequence)):
order_type = order_sequence[i]
j += 1
if j < 10:
order_no = '000' + str(j)
elif j < 100:
order_no = '00' + str(j)
order = Order(env, order_type, order_no, workshop)
while True:
yield env.timeout(random.randint(t_inter - 2, t_inter + 2))
idx = i % (len(order_sequence) - 1)
order_type = order_sequence[idx]
i += 1
j += 1
if j < 10:
order_no = '000' + str(j)
elif j < 100:
order_no = '00' + str(j)
order = Order(env, order_type, order_no, workshop)
# Setup and start the simulation
print('Workshop')
random.seed(RANDOM_SEED)
env = simpy.Environment()
env.process(setup(env, T_INTER))
env.run(until=SIM_TIME)```