Questions tagged [transmission]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
0 answers
5 views

Attenuation along microstrip

I just wanted to know why signal attenuation decreases with length across a micro strip transmission line. Isn't it meant to decrease but experiments show otherwise.
user avatar
  • 1
0 votes
0 answers
7 views

NFC chip to directly compare sent to stored value

I had an idea for an application using NFC chips / tags. The idea would require me to store a value on the chip. Later, during usage, an active device like a phone should send a value and the NFC chip ...
user avatar
0 votes
2 answers
54 views

Cogs ratio for 1:20 speed increase

Question may be a bit stupid and funny, but any kind of help would be appreciated. I need some kind of a transmission system. I have little to no experience in mechanics or similar, that's why I'm ...
user avatar
0 votes
1 answer
41 views

Clutch for rotating axis of mount used for astronomy

a short disclaimer that for me mechanical engineering is a hobby. Please be gentle with me, even if there may be an obvious answer. The main reason for asking here is that searching for the topic you ...
user avatar
0 votes
1 answer
46 views

Small belt transmission: Radius difference?

I am trying to make a pulley reduction system for my project. I need it to be as quiet as possible, so I am considering pulleys. My project also has limited space, so I am trying to have as small a ...
user avatar
0 votes
2 answers
45 views

Could we theoretically use much lower frequencies for fiber optic transmission?

I was thinking, fiber optic communication uses baseband signaling and even 400 gigabit Ethernet only needs ~100 GHz with the modulation that they use. So you still have 3 orders of magnitude before ...
user avatar
1 vote
0 answers
45 views

Gear Oil HP 85w-140 vs HP-140

I have a 4 Stroke scooter 150cc (SYM JET-14). Manufacturer recommends 85w-140 gear oil. The price difference between 85w-140 and single grade 140 is tremendous. Given that in my country and during ...
user avatar
  • 11
13 votes
1 answer
1k views

How does a (pulley based) continuous variable transmission (CVT) work?

How does the (pulley based) CVT achieve the following? no requirement for a clutch fuel economy smooth gear transition
user avatar
  • 22.6k
4 votes
3 answers
173 views

How does my automatic car shift without complete temporary loss of acceleration

When my car shifts gears, the car's acceleration never goes to 0. I feel that there is constant torque to the wheels throughout the entire shift. How is this possible during a gear change? ...
user avatar
0 votes
0 answers
32 views

Double Stub Matching Impedance

I'm trying to understand the double stub matching impedance using Smith Chart. Here is the diagram for the double stub impedance: The impedance on the right has to appear purely resistive. So ...
user avatar
  • 101
1 vote
0 answers
35 views

Where do I start with learning how to transfer data via RF

So I literally have no idea where to start but I know what I want to make. The goal is to somehow transmit 25mb/s of data across 15km with high penetration. Acceptable for reaching through trees and ...
user avatar
0 votes
0 answers
64 views

How does tractor achieve constant PTO speed?

Tractors have a PTO shaft which supplies power to implements. Most implements are rated 540 or 1000 RPM. I'd like to know more about transmission that is used to convert variable motor shaft rotation ...
user avatar
  • 101
0 votes
3 answers
52 views

What is a gearbox with switchable outputs called?

I need a mechanism with which one motor can drive one of two outputs. So only one output should be active at a time, but the mechanism should be able to switch between the outputs. What is a mechanism ...
user avatar
  • 101
1 vote
2 answers
234 views

Engaging and disengaging drive power

I'm looking for a solution to selectively engage and disengage a drive shaft with a number of output pulleys, one-at-a-time, like a clutch. Speed would be around 1000 RPM, and torque less than 20 inch-...
user avatar
  • 170
0 votes
0 answers
19 views

Typical dirt bike clutches - is there a norm?

I have several of the typical 49cc 2 stroke engines used for dirt bikes. They all have the same type of centrifugal clutch. Recently I have ordered a Honda GX-35 (4 stroke) engine and - what a ...
user avatar
2 votes
3 answers
184 views

Bandwidth vs Capacity

Two questions on wireless transmission, packed into one. First: I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could ...
user avatar
1 vote
0 answers
22 views

Is there any way to simulate belt transsmition with non-circular cog?

I want to do a simulation of a transmission with toothed belt and elliptical gear. I've tried in Autodesk inventor by modeling wheels separately and then adding a belt with the "synchronous belt tool" ...
user avatar
0 votes
2 answers
79 views

Why does the synchromesh in manual transmissions act on the output shaft?

Wikipedia has a good animation of a manual transmission, but something irks me. If I understood correctly, in the animation, the input shaft is in green, and the output shaft is in cyan. The dog ...
user avatar
  • 134
0 votes
1 answer
83 views

Transmission line length with sag

I have a straight-line distance of 250 km between two towers and want to find the length of the transmission line that is between these two towers while accounting for the sag. The line should be ...
user avatar
  • 1
2 votes
4 answers
281 views

How can a clutch engage gradually without wearing away very quickly?

Here's an animation of a gearbox and clutch from Wikipedia. I learned to drive recently, and was surprised at how the clutch worked, engaging gradually as I moved the pedal by fractions of a ...
user avatar
  • 121
1 vote
0 answers
38 views

Clutch for high-speed operation (>40 000 rpm)

I'm currently working on a setup where at some operations my motor has to drive a shaft up to the motor's maximum operating speed (12,000rpm) and a torque of ~0.14Nm but at other conditions this shaft ...
user avatar
  • 11
1 vote
1 answer
36 views

Inertia and friction between gears

I have a question regarding inertia and friction between gears. I have a gear which is connected to the rod at one end and an electric motor which is connected to the other end. I know the torque of ...
user avatar
1 vote
1 answer
22 views

How does free space path loss change with receiver's antenna's height

I have a question which seems like an easy one, but I couldn't find anything on Internet to be 100% sure. The free space path loss equation is: $$FSPL=20\text{log}(d)+20\text{log}(f)+20\text{log}(\...
user avatar
0 votes
0 answers
25 views

Torque output of transmission when accounting for moment of inertia

A cable drum is driven by 3 electric motors via a bull gear arrangement. Gear ratio, total motor inertia (including pinion gears) and total drum inertia are known. From the motor variable speed drives,...
user avatar
  • 101
1 vote
0 answers
225 views

Electronic Pressure Control, EPC

In short, the question is: How the EPC affects an automatic transmission? I'm planning to build an automatic transmission controller module, TCM for 4F27E Ford transmission. So far I haven't found an ...
user avatar
3 votes
1 answer
79 views

How are water-tight transmissions made, like the kind you see on inboard boats, pumps or food blenders?

I want to replicate the kind of interface you see on inboard boats, pumps, or food blenders. Basically, I want put a motor in a sealed vessel, and have it turn a prop outside the vessel, in water. ...
user avatar
  • 33
0 votes
2 answers
253 views

How don't dog clutches collide?

I'm learning about how dog clutches work particularly in sequential transmissions. I'm having a hard time understanding the principle which ensures dogs will always mesh correctly. I can easily ...
user avatar
1 vote
1 answer
69 views

Electric engine and transmission

What kind of automatic transmission would be the best to connect an electric engine with the rear axle of a RWD car? Specifications: 200HP, 3000rpm electric motor top speed 220km/h The automatic ...
user avatar
-1 votes
2 answers
433 views

Is it ok for clutch to slip in DCT in certain situations?

When driving a car with manual transmission on start you slowly release the clutch so the car doesn't jerk. So clutch slippage here is not that bad if I understand this correctly? And also couldn't ...
user avatar
1 vote
3 answers
135 views

How to accumulate torque of multiple independent gears?

I did not find any answers to this simple problem across the web, maybe seeking help in this forum helps: As an example, let's assume we have multiple windmills, each of them producing torque, but ...
user avatar
0 votes
2 answers
591 views

Is it possible to design automatic transmission without torque converter?

So the reason why torque converter is needed is because it disconnects engine from transmission. It has also extra benefit of multiplying torque but that is not 100% necessary. From what I have seen ...
user avatar
1 vote
4 answers
196 views

How does ferranti effect occur?

I search and read about Ferranti effect online, but none seems to be clear enough for me to understand how it actually happens. I must say, I do not have much prior knowledge about inductive/...
user avatar
  • 11
0 votes
1 answer
64 views

Why aren't detent clutches used in car transmissions?

In automatic transmissions some parts need to be moving with the engine in one moment and in the other they need to be stopped. Why don't transmisisons then use detent clutches to accomplish this?
user avatar
0 votes
0 answers
46 views

Why does DSG have low torque capacity?

Why does DSG have low torque capacity? They are very simillar to manuals but manual transmissions can handle greater torque. Why js that? What determines the torque capacity of transmission?
user avatar
2 votes
0 answers
122 views

Negative transmit power in dBm

I am calculating the transmit power for $K$ single antenna IoT devices in an Indoor scenario. The receiver has 64 antennas. I am trying to minimize the transmit sum-power, i.e., $\sum_k p_k$, where $...
user avatar
0 votes
0 answers
338 views

Why do instructions on creation of roller chain sprocket tooth profile require redundant measurements?

I'm CADing a tooth profile for a bicycle chainring model and I'm referring my measurements and formulas to these sources: http://www.gearseds.com/files/design_draw_sprocket_5.pdf https://data.epo.org/...
user avatar
0 votes
2 answers
40 views

Would some manufacturing processes be more efficient if driven differentially by a single motor, up to ~150 kW, than multiple lower-rated motors?

I'm writing a discussion paper on the potential energy efficiency benefits of integrating different manufacturing processes by co-location on the same site. One possible field for integration is in ...
user avatar
-1 votes
2 answers
68 views

Transmission for variable-speed flywheel to output a steady output speed?

If you had a flywheel acting as a mechanical battery in an all mechanical system, such that you could pump energy into the flywheel up to a desired speed and then slowly drain its kinetic energy - ...
user avatar
0 votes
1 answer
74 views

Calculations of compound gears?

Recently I've been scratching my head over an assignment, and I have trouble understanding a couple of the parts. The issue I have is with the overall calculations, since we've just started on ...
user avatar
  • 3
0 votes
2 answers
98 views

How to fix this gear

This is a gear that transfers force from a motorcycle kickstarter to the transmission. What method should I use to repair the missing teeth.
user avatar
1 vote
1 answer
60 views

Measuring intensity of a radio wave reflected from a metal plate

I am building a Project that can pinpoint location of a pen or any object (something as small as 0.5 mm radius sphere) placed on a flat screen. I am using a ultrasound sensor (initially but i can ...
user avatar
2 votes
3 answers
3k views

Manual transmission: Why downshifting is less smooth than shifting up?

Today while driving I had to make a quick shift to a lower gear that was not as smooth as it should've been. I've been taught that while shifting to a lower gear you have to be more careful when ...
user avatar
  • 2,185
3 votes
2 answers
5k views

Friction clutch and the force required

I recently learned the basics of automotive clutches, more specifically friction clutches. Here is a simplified version of their operation explained to me (the car starts at rest): The engine and the ...
user avatar
  • 2,185
1 vote
1 answer
25 views

Automatic translation of either-sided rotation to fixed directions?

Is there a purely mechanical device that takes in clockwise or counter-clockwise rotation 'indiscriminately' and outputs in both cases clockwise rotation?
user avatar
1 vote
2 answers
64 views

Equal power transmission in 4x4 vehicles?

If a 4x4 (true 4x4 not AWD) has 3 wheels slipping, does the one tire with traction receive all the torque available from the transmission? Is there typically a reduction in power transmission in 4x4 ...
user avatar