As shown in Table 3, just by optimizing the order in which the deliveries are made in each current route (i.e., TSP
optimization) one can reduce the total distance travelled by 22.68%. This number is exceptionally high. Because of the poor
definition of the service areas, and the large number of one-way streets and complex traffic conditions in the city center,
the downtown area of Jyväskylä is quite demanding for a manual route optimization. The largest savings obtained by the
TSP optimization procedure therefore also correspond to routes operating in the downtown area.
By also allowing the optimization of the allocation of customers to tours (i.e., normal VRP optimization) the savings are
typically even larger. Probably the best benchmark for current practice is scenario 3, where one has a 3.5 h time window
available for making the deliveries. According to Table 3, the use of routing software would generate 33.35% savings in
distance and a 30.16% saving in the number of vehicles needed, compared to the current practice, while keeping all service
conditions the same.
Scenario 2 is the best match with the current recommendations on route length, with its 2 h time limit for routes.
However, from Tables 1 and 4 it is clear that the current routes do not meet this time limit either. In fact, the average
duration of current routes must be even more than the average 146.8 min of Scenario 1, because the current routes are
longer. This means that even the routes with a 2.5 h time limit (corresponding to Scenario 4) are more constrained than the
current routes. Nevertheless, scenario 4 would give over 20% savings in both distance and number of vehicles.
Currently only one vehicle can be loaded at a time, causing most vehicles to depart from the central kitchen between
10 and 11 when deliveries are already allowed, thus reducing the possible delivery time window. This could be improved
by constructing a larger loading platform that allows loading of multiple vehicles at the same time. Results of scenario 5
demonstrate a case where two vehicles can be loaded simultaneously. According to results, the simultaneous loading would
reduce the number of vehicles needed by about 4% but would not have much effect on the total distance, compared to the
otherwise similar scenario 3.
Current tour durations are probably over 2.5 h and the trend is towards meals that are cooled after being prepared at
the central kitchen and that can later be heated up by the customer or the home care personnel at their convenience. These
facts support the idea of not following the 2 h regulation to guarantee a pre-heated meal. If the 2-h specification need not
be followed, it becomes possible to extend the delivery time window from the current 3.5 h. Scenario 6 demonstrates the
results of a 5-h time window. As one can see, this extension provides substantial savings, up to 50.79% in the number of
vehicles and 36.67% in total distance, compared to current practice.
Currently the meals are packed in special packages that need to be returned to central kitchen at the end of the day. The
packages are then cleaned to be used the next day. In many cases, returning to the central kitchen at the end of the day
requires a substantial amount of driving and time, compared to a situation where one would not need to return. This would
As shown in Table 3, just by optimizing the order in which the deliveries are made in each current route (i.e., TSPoptimization) one can reduce the total distance travelled by 22.68%. This number is exceptionally high. Because of the poordefinition of the service areas, and the large number of one-way streets and complex traffic conditions in the city center,the downtown area of Jyväskylä is quite demanding for a manual route optimization. The largest savings obtained by theTSP optimization procedure therefore also correspond to routes operating in the downtown area.By also allowing the optimization of the allocation of customers to tours (i.e., normal VRP optimization) the savings aretypically even larger. Probably the best benchmark for current practice is scenario 3, where one has a 3.5 h time windowavailable for making the deliveries. According to Table 3, the use of routing software would generate 33.35% savings indistance and a 30.16% saving in the number of vehicles needed, compared to the current practice, while keeping all serviceconditions the same.Scenario 2 is the best match with the current recommendations on route length, with its 2 h time limit for routes.However, from Tables 1 and 4 it is clear that the current routes do not meet this time limit either. In fact, the averageduration of current routes must be even more than the average 146.8 min of Scenario 1, because the current routes arelonger. This means that even the routes with a 2.5 h time limit (corresponding to Scenario 4) are more constrained than thecurrent routes. Nevertheless, scenario 4 would give over 20% savings in both distance and number of vehicles.Currently only one vehicle can be loaded at a time, causing most vehicles to depart from the central kitchen between10 and 11 when deliveries are already allowed, thus reducing the possible delivery time window. This could be improvedby constructing a larger loading platform that allows loading of multiple vehicles at the same time. Results of scenario 5demonstrate a case where two vehicles can be loaded simultaneously. According to results, the simultaneous loading wouldreduce the number of vehicles needed by about 4% but would not have much effect on the total distance, compared to theotherwise similar scenario 3.Current tour durations are probably over 2.5 h and the trend is towards meals that are cooled after being prepared atthe central kitchen and that can later be heated up by the customer or the home care personnel at their convenience. Thesefacts support the idea of not following the 2 h regulation to guarantee a pre-heated meal. If the 2-h specification need notbe followed, it becomes possible to extend the delivery time window from the current 3.5 h. Scenario 6 demonstrates theresults of a 5-h time window. As one can see, this extension provides substantial savings, up to 50.79% in the number ofยานพาหนะและ 36.67% ในระยะทางรวม เมื่อเทียบกับกระแสในปัจจุบันอาหารถูกบรรจุในแพ็คเกจพิเศษที่ต้องถูกส่งกลับไปครัวกลางในตอนท้ายของวัน การแพคเกจแล้วทำความสะอาดที่จะใช้ในวันถัดไป ในหลายกรณี กลับไปที่ครัวกลางในตอนท้ายของวันต้องการเป็นจำนวนมากจากการขับขี่และเวลา เมื่อเทียบกับสถานการณ์ที่หนึ่งจะไม่ต้องส่งคืน นี้จะ
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