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Mechanical Engineering


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About nwankotiwk

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    Cape Peninsula University of Technology

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  1. Hi All, I have found what the problem, alternator belt was loose after has been re-done, therefore all along the belt was slipping through the pulleys. Again the alternator itself wasn't tight so when driving it was swivelling by the bottom holding bolt. All these occurrences of belt slippage made the alternator not to rotate as it should to can charge the battery. So what i did is that i bought a new alternator belt and then bolted tight the alternator. Now its charging perfectly fine. Wisani,
  2. Hi Fellows, My car has an issue and I am kind-of finding it very challenging to comprehend it. I bought a new battery a week back and I got the alternator re-done after the rear bearing inside of it seized, so now my battery seems to charge when the headlights are off, but the minute I turn them on, I see the brightness slowly diminishing to death and suddenly the car dies down. When I run the car for a few minutes with the headlights off, and then Later turn them on, the brightness is back and all of a sudden it slowly goes down again.The more confusing thing again is that there is no battery warning light on the dashboard, the only thing that pops up is the Engine Oil Pressure Warning light and then eventually the car shuts down. To show that the battery is completely flat, for me to restart the car, i then need someone to boost the battery,or get an already full battery to get it started. Fellows, please advise what could really be transpiring in this occasion as well as a reasonably applicable solution. I would appreciated your sincere assistance. Wisani Nwankoti, (Graduate Mechanical Technician) South Africa
  3. Thanks for all the reply guys. There are no actual answers for this question. It is a real life practical exercise taking place in the Gold Mine where I am currently working as a Junior Engineer. All I need is a precise algorithm and approach towards solving this problem. My Senior Engineer intends building a model of this system from the findings, elaborative engineering reasons on assumptions made where necessary. Hence I genuinely seek advices from you guys as my Engineering Family. I intentionally didn't put plenty of information in my question and had to keep it straight and simple. I used hydroelectric power plant for simplicity than a Gold Mine, however, let me go deep a little bit to the actual scenario as it stands. We used to have a pumping system from the bottom level C to upper level A which is roughly 40.8m high. At level B in between C&A there is a dam with which it’s fed with water from level A. The water gravitates from Level A to Level B to run the Pelton Turbine to generate back-up power. From the history of this system, the water that was flowing out of the dam was at 1.2m3/s. Logically to me, I thought, for the dam level to remain constant then the volume of water entering the dam per second must be the same as the volume of water exiting the dam. That’s where I got the pumps delivery flow rate of 1.2m^3/s . With the head of 40.8m, assuming the density of water to be 1000kg/m^3 and gravity at 9.8 m/s^2 I got the Pressure=) to be 400kPa. I thought scaling down the actual parameters at 1:4 is ideal and feasible for model study purposes. My understanding: ûThe only thing that relates the prototype pump to the model pump is the scale of 1:4 ûThe modification "Design Change" only applies on the pump and what is directly linked to it, nothing else. ûThe flow rate for model study must be one quarter of the actual flow rate and is 0.3m^3/s ûWhat about the actual pressure? because the head remains unchanged.
  4. A large pump delivering 1.2 m3/s of water with a pressure rise of 400 kPa is needed for a particular hydroelectric power plant. A proposed design change is tested on a smaller 1:4 scale pump. Estimate the flow rate and pressure rise which would be expected in the model study. If the power needed to operate the model pump is measured to be 8000 kW, what power would be expected to operate the prototype pump?
  5. Friends, I have got a question please... assist. Can anyone please assist with a basic "simplified" explanation explaining a systematic engine air-filtration process? i.e. from the atmosphere back to the atmosphere asking the WHY question for every step. lets discuss.
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