In the middle
g j - j-th mean the replacement tool remaining life, which is divisible t i 
Remainder
t i —— the remaining service life of the jth sister tool - the average usage time of each demand in the sequence of unsorted parts to the tool
Ï„ i - the i-th demand time in the sequence of demand for the unsorted part 
P——the total number of times the unsorted part has a total demand for the tool, ie the length of b, i∈b
2.2 Recursive calculation process
First select an element in b as aΔ1, at this time b'=face=symbol>b-aΔ1, find F (1) with equations (1) and (2 ) and write down, then put aΔ1 back to face=symbol In >b, select another element in b as aΔ2, at this time face=symbol>b'=b-aΔ2, find F (2) and write down, in this way, p elements in b are taken as aΔ Try it out until you find F (p) , choose a minimum F (*) from it , fix the order of aΔ*, and take aΔ* as the last element of a, then make a new round from the remaining b AΔ is selected until all the elements in b are exhausted.
When comparing and selecting F (*) , sometimes there are multiple equal minimum F (i) , you can choose one of them, or you can take the opportunity to fine-tune: If you want the useless remaining life to be concentrated on a few tools, choose F F is larger mean square error of g j; useless if desired remaining lifetime are dispersed on the multi-tool, it is selected from F, g j are small variance F.3 global decision
3.1 Tool lag time
Tool lag time is the time that the machine stops waiting for the tool, which directly affects the production efficiency of the FMS. Tool control should try to minimize tool lag time. Qualitatively speaking, the position of the tool when the machine needs it determines the size of the tool lag time. The positional relationship of the time is: in the position of other machine tools > in the local tool magazine of other machine tools > in the central tool magazine > local Partial tool magazine.
Set: LT ij is the lag time of the i-th machine waiting for the j-th tool, P k is the remaining machining time of the part when the tool is machining the part of the k-th machine, tp kj is the tool j from the other k-th machine The transfer time from the use position to the local local tool magazine, ta kj is the transfer time of the tool j from the local tool magazine of the other kth machine tool to the local local tool magazine, tc j is the tool j from the central tool magazine to the local local tool magazine Transmission time. Then there isLT ij =P k +tp kj (when the tool j is in the position of the kth machine)
LT ij =ta kj (when tool j is in the local magazine of the kth machine)LT ij =tc j (when tool j is in the central magazine)
The above formula ignores the upper and lower tool times between the tool to be used and the local local tool magazine.
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Ground Screw For Timber Construction And Sheds
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