Join Corey "the Coaster Man" Rasmussen as he explains all kinds of nerdy engineering stuff.
The Mentored Engineer is a resource for mechanical engineers of all skill levels, but geared for young engineers just entering the work force. The material here will minimize the time needed to get an engineer competent in his or her field.
Roller Coasters are one of our passions and we are very interested in the planning, design and building of backyard coasters. Traditionally, we all know about lift hills and letting gravity take over after that. But is a launch roller coaster a possiblity? Absolutely.
Interested in how you increase SM without increasing the area moment of inertia...did you post a video that explains this? Also, what would be benefit of this? Thanks.
Generally speaking, SM will increase with AMoI. I believe the desire is to gradually add material so that it will change the stress flow pattern. Adding material at the neutral axis allows for limited stress concentrations and then tapering it to the edge has minimal effect on the existing structure.
The general idea is to have gradual transitions. The angle of 22.5° works well in most cases. I will usually start the gusset at the neutral axis and then taper the leg at 22.5° until I get past the edge of the horizontal tube.
I know this is an older video but I am hoping it is still monitored and you can help me out here. I have went down the bit hole of planetary gears and have watched several different videos and I am confused by what I think is conflicting information (more likely me just misunderstanding) From online the gear ratio from sun to stator/carrier GR = 1 + (number of ring teeth/number of sun teeth). I believe the gear ratio also = driver speed / driven speed. In the case of a locked ring gear, and using the teeth number from your examples, the gear ratio, GR, for from sun to stator would be = 1+ (100/20) = 6. If it is also true the GR = driver speed / driven speed, then the stator rotational speed would then be = driver speed / 6, or 16.667%. In your example, you arrive at the fact that the stator is rotating at 40% of the sun, which is different. Can you possibly clear this up for me? Like I said, I figure I can chalk this up to my misunderstanding but I like answers haha
Nate, thanks for the inquiry. The number of teeth will indicate the ratio because they are all tied together. Check out this article mentoredengineer.com/calculate-planetary-gear-ratios/ and others on mentoredengineer.com for more information on this subject
I appreciate the concern. I've been super busy with client work but hope to get back on the Tilley's Terror in the next 3-4 months. Next step is to make a model of the launch and get the PLC to control it.
Tip: to prevent those moments where the passengers head goes off the seat, make the track turn at most 40° into the pivot point! The g forces would be curved so if the track is facing that curve more that it is in this video, it wouldn’t push the passenger like that.
The input in both stages is the sun. Stage 1 is the motor shaft. The stage 2 sun is connected to the stage 1 carrier. THe ring is held steady, but if the torque is to much, it will rotate.
We'd love to make all gussets perfect, but there are other design constraints like using tabs & slots for alignment and easier manufacturability! Can't really use those with a side gusset. Any tips on a least bad gusset design when you want to use tabs and slots with the gusset?
Yes, you are referring to LIM motors and they are the first generation of linear motors. There are many roller coasters that use them like Possessed at Dorney Park and Flight of Fear at Kinds Dominion. They are very innefficient and not at all precise as they allow slippage. (LSMs do not) BTW -I believe you mean inductance and not reluctance
@@MentoredEngineerthank you for answering :) I know that the 2 existing linear motors are permanent magnet and induction. I was asking whether you ever saw a reluctance linear motor.
While the second half of the video has some very relevant suggestions, I do feel that it is not necessarily adding credibility when you state outright that you prefer hand calculations in a video about doing less FEA and more hand calculations (conflict of interest, no?). An FE specialist is unlikely to suggest that hand calculations are a waste of time, on the other hand. I would imagine that what you pointed out for the hand calculations (i.e. that they take a lot of time in the beginning but become quicker over time and experience) apply equally to finite elements calculations, no? Especially since a finite element model can provide significantly more information relative to the time spent.
Mentored engineer, could you do a video covering hydraulic theory behind sizing a pilot to open check valve on a log splitter? Specifically selecting valve cracking pressure and pilot ratio? As well as hose sizing for a 22gpm pump?
I don´t know where to start reviwing my hand calculation but is a must, I have to study all the procedure again, it's been a long time since I did this type of structural calculation
Isaac, the link below is a refresher course that I have if you sign up for at the engineering level of my membership. Just click "Join" below the video. ru-vid.com/group/PLTWLKyk8roHzQ-wjKJBY2nk-wZaO4PSAs
In the 1860s the limitations of cast iron were known yet Bouch to save money still used it in tension on all vital pier couplings and combined with appalling manufacturing was criminaly negligent
How did you do the launch? I have a backyard coaster I build in the Raleigh NC area with my girlfriends brother, and we want to add a launch instead of its lift hill
3 cylinders can be difficult. If you can't mechanically tie them together, I would try to meter the flow out of each cylinder with a flow control valve. After that, you will need to add some sort of electronic control system that measure the stroke and then changes the flow of oil as needed. I'm facing the same challenge right now, but with 10 cylinders all having varying loads.
