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1500 questions
7
votes
1 answer
Which is more durable in sandy desert conditions: electric motors or hydraulic pistons?
If we have a tracking system placed in a tough desert environment with occasional sandstorms and temperatures that go as high as 50C, which actuator would be better: a hydraulic piston or an electric motor with a gearbox?
My main concern is…
Mohamed Hassan Allam
- 91
- 4
7
votes
2 answers
Traction mechanisms for a robot in confined spaces
I'd like to build an exploratory robot that can fit within confined spaces1.
What traction mechanisms should I consider to propel a robot along the inside of a 4" pipe?
The pipe to be traversed will likely have fluid (assume water) within it to…
user16
7
votes
1 answer
What is a method to detect thermal oxide layer after steel is painted?
Is there a method to test for thermal oxide on a painted steel part after the paint has cured? I'd rather the method be nondestructive but it only being destructive in the presence of thermal oxide is also acceptable.
I am specifically looking for…
Acumen Simulator
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7
votes
1 answer
How to apply power flow analysis?
I have an (AC) power grid topology with generators, consumers, power lines, tranformers, etc. I also have a "snapshot" of the system's state, i.e., I know how much real power the generators feed, how much real power is used by the consumers, I know…
Technaton
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7
votes
1 answer
What types of materials can be tested in a split Hopkinson pressure bar?
A split Hopkinson pressure bar can test different types of specimens, I would like to know what types of materials that are suitable to be tested with this method?
Sina M
- 131
- 2
7
votes
1 answer
What needs to be considered when configuring the clock system for a MSP430F5xxx micro-controller?
I need to configure the clock systems for a MSP430F5528 microcontroller. The current development board has a 24MHZ crystal attach to XT2 pins (XT2IN/XT2OUT). The current design will need to support the follow peripherals.
UART
ADC
SPI
Timers
Few…
Mahendra Gunawardena
- 7,135
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7
votes
1 answer
In a device tree for AM335x, how do I know what pinctrl values to use?
In the Linux kernel's dtsi file (am335x-bone-common.dtsi) for the AM335x processor, there is the am33xx_pinmux tree, with values like this:
i2c0_pins: pinmux_i2c0_pins {
pinctrl-single,pins = <
0x188 (PIN_INPUT_PULLUP |…
Patrick
- 1,082
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7
votes
2 answers
How fast movement (cycles/s) can I reliably read with PSoC4 quadrature decoder?
PSOC4 provides a quadrature decoder functionality but I was unable to find specifics on its performance in the datasheets. Sure I know I need to read and utilize the count until the 16 bits of its counter overflow, but that's some 32k per iteration…
SF.
- 6,135
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7
votes
1 answer
Using a pattern of features as datum BOTH individually and as a group, for different FCFs
The quick:
I've come up with a handful of possible options for how to structure the Datum Reference Frames (DRFs) and Feature Control Frames (FCFs) for this part. I've narrowed it down to the two shown below, but I don't know which is better, or if…
CBRF23
- 363
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7
votes
3 answers
Can gravity be a driving force for a spring-mass system?
If a spring-mass system is undergoing free vibration (oscillating up and down), then does it imply that there is no gravity?
My tutor always consider gravity when finding the Equation of Motion for such a system. But isn't gravity is an external…
Mason Z
- 81
- 4
7
votes
1 answer
Why does the LTE Specification define SC-FDMA as the modulation scheme for the reverse link?
The LTE specification specifies SC-FDMA as the encoding scheme for the reverse link (mobile to base station) when the forward link uses OFDMA.
What is the reason for the difference?
psubsee2003
- 179
- 7
7
votes
1 answer
How does humidity, specifically using a humidifier, affect the filtration of PM2.5 particles from a room?
I live in a very smokey and dry area where people are advised to use air purifiers. Since it's also dry I'm curious what affects, if any, adding a humidifier to a room with an air purifier would have?
When I looked into it, it seems like moisture…
joeyfb
- 171
- 1
7
votes
1 answer
How were the tones for DTMF chosen?
In my limited engineering knowledge, and limited research skills, I couldn't find a complete answer for the reasoning behind the chosen tones for DTMF. I did find a hint that said something about resonance/interference, but that's not enough details…
natebot13
- 73
- 3
7
votes
4 answers
Why is the friction factor in laminar flow independent of pipe roughness?
The Darcy friction factor is defined as:
$$f_D =\frac{64}{Re}$$
with $Re$ I mean Reynolds number (global).
I was wondering why Darcy in laminaire flow is independent of pipe roughness (wall roughness)?
That is not the case in turbulent and transient…
user14407
7
votes
5 answers
Would a centrifugal flyweight governor system slow down the descent of an object that is free falling down to the Earth's surface? (Revised design)
I am wondering if rotating flyweights would slow down the descent of a object that is free falling down to the Earth's surface.
Please reference the conceptual drawing below:
This drawing is showing a cross-sectional view of a sealed hollow…
user26803