Mechanical Engineering Assignment PDF
Added on 2021-04-21
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Running Head: MECHANICAL ENGINEERINGMechanical EngineeringStudent’s NameInstitution
MECHANICAL ENGINEERING2Question 1:a)They are;High cost. Managed by increasing the supervisory span.Low equipment utilization. Managed by reduction of machine output requirements.Confusion. Managed by making more constant schedules in process requirements[ CITATION Moh17 \l 1033 ]. b)They include:Re-engineering of business processes.Managing execution and planning tools.Designing in assembly /manufacturability.Processes involving reorganization.Incorporation that is inter-organizational.In the improvement of information technology.In the collection of point-of-scale data[ CITATION Wei16 \l 1033 ].c)Hard enablers;Conveyor system. They move goods from one place to another via the conveyor belt.Lifting cart. They are machines are employed to lift goods when operated by the man. Soft enabler;Robot. They are automated to make decisions either for lifting or packing.Sensors. They detect situations in the environment by the use of logic information.d)Hard automationThis has its reference to using equipment that has the special purpose of automated fixed-sequence assembling or processing operations. Every sequenced operation has simple andplain rotational or linear movement. This automation has relatively higher difficulty in its product design. An example is the cart lift[ CITATION Wei16 \l 1033 ].Soft automationThis automation involves the use of programs. The instrument used has the designed capability of changing the sequence of operation to suit the variety of product configurations. The program controls the operations with the use of instructed codes. The instrument’s system is able to read and make an interpretation. One example is a robot[ CITATION Moh17 \l 1033 ].
MECHANICAL ENGINEERING3Question 2: Bottleneck Model A flexible manufacturing cell consists of three machining workstations plus a load/unload station. Theload/unload station is station 1 with one server (human worker). Station 2 consists of two identical CNChorizontal milling machines. Station 3 has one CNC vertical machine. Station 4 consists of two identical CNCdrill presses. The four stations are connected by a part-handling system that has one work carrier. The meantransport time is 2.0 min. The FMC produces two parts, A, and B. The part mix fractions and process routingsfor the two parts are presented in the table below. The operation frequency fijk = 1.0 for all operations.Determine (a) maximum production rate of the FMC, (b) corresponding production rates of each product, (c)utilization of each machine in the system, and (d) number of busy servers at each station. A spreadsheetcalculator is recommended for this problem. Part jPart mix pjOperation kDescriptionStation iProcess time tijkA0.21Load13 min2Mill220 min3Drill312 min4Unload12 minB0.31Load13 min2Mill215 min3Drill330 min4Unload12 minC0.51Load13 min2Drill314 min3Mill222 min4Unload12 minSolution:a)WL1 = (3+2)(0.2)(1.0) + (3+2)(0.3)(1.0) + (3+2)(0.5)(1.0) = 5.0 minWL2 = 20(0.2)(1.0) + 15(0.3)(1.0) + 22(0.5)(1.0) = 19.5 minWL3 = 12(0.2)(1.0) + 30(0.3)(1.0) + 14(0.5)(1.0) = 18.4 minnt = 3(0.2)(1.0) + 3(0.3)(1.0) + 3(0.5)(1.0) = 3, WL4 = 3(2.5) = 7.5 minBottleneck station has largest WLi/si ratio:StationWLi/si ratio1 (load/unload)5.0/1 = 5.0 min2 (mill) 19.5/1 = 19.5 min Bottleneck3 (drill)18.4/1 = 18.4 min4 (material handling)7.5/1 = 7.5 minBottleneck is station 2: Rp* = 1/19.5 = 0.05128 pc/min = 3.077 pc/hrb)RpA = 0.05128(0.2) = 0.01026 pc/min = 0.6154 pc/hrRpB = 0.05128(0.3) = 0.01538 pc/min = 0.9231 pc/hrRpC = 0.05128(0.5) = 0.02564 pc/min = 1.5385 pc/hr
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