62
votes
Accepted
How was Volkswagen able to trick the lab pollution test?
After the 2014 ICCT report revealed that these light-duty passenger diesel vehicles were emitting too much NOx and US regulators confronted VW about the results, VW did some testing and proposed a ...
- 3,211
5
votes
How was Volkswagen able to trick the lab pollution test?
Details have emerged in the German press that indicate this was known about in 2007 (from German newspaper Bild am Sonntag, as translated by Automotive News):
According to the report, Bosch claims ...
- 51
3
votes
Accepted
Identification of bolt material
I imagine you could just cut it in half and look at the boundary under a microscope or loupe. Compare against a known sample that is hot-dipped and one that was cold-dipped. I imagine it should be ...
- 5,237
3
votes
Accepted
Why use a reference volume for leak testing?
Pressures change in a vessel based on ambient conditions. The reference volume removes that source of error.
- 6,544
3
votes
Accepted
How to resolve file space issue on CDAQ Controller with Labview Test System?
@Mahendra, I had run into Hard Drive Memory Space issue few months ago on my NI cDAQ. I am using cDAQ-9132 with a 16 GB hard drive, similar to your cDAQ. I was running LabVIEW Professional 2017 SP1 ...
- 350
3
votes
Accepted
Test UV protection on sunglasses
Your question is a little naive: "Maximum UV protection" doesn't mean much.
What you want to know is the spectral attenuation values in the UVA and UVB wavelength bands. The glasses reduce the ...
- 4,199
3
votes
Accepted
Gear testing rig
Torque ratings for bevel POM (also called acetal or Delrin) gears are at http://www.huco.com/products.asp?p=true&cat=285
I didn't find timbre boards on google, I assume you meant timber wood ...
- 612
3
votes
Accepted
What level of vibration testing should I perform on my product?
It's not just about selecting a level of vibration. There's a lot more that goes into developing a vibration test program that does what you're talking about. There's probably not any one vibration ...
- 2,145
2
votes
What level of vibration testing should I perform on my product?
Since you are planning on testing you are already ahead of a lot of companies. Trevor makes some good points in the comments. Failure from vibration is certainly non-linear, but it typically errors in ...
- 7,904
2
votes
Why does tensile testing in thin films (ASTM D882) require a non-dogboned sample?
ASTM D882 is for plastic films. For thins films of many other materials, dog-bone specimens are more commonly used.
The deformation of dog-bone specimens is not homogeneous through the length of ...
- 1,443
2
votes
Short sample in a 4-point bending test ( ASTM C 393 )
Standards are established for a reason: so that tests are conducted to an established procedure so that the results are comparable. If the standard calls for a length of 150 mm then that is what is ...
- 9,642
2
votes
How can I determine pressure leakage in a pneumatic system?
Fit a dummy test hose with no leaks - a solid tube for example, then pressurise the system to a known value perhaps the maximum used +10%.
Then take readings every 10 seconds / 5 minutes (whatever is ...
- 15.5k
2
votes
How to resolve file space issue on CDAQ Controller with Labview Test System?
If the built-in storage is fully utilized, there are three other options for saving test data:
Save to a network share
Save to a USB flash drive
Save to an SD card
All of these connections are on ...
- 121
2
votes
DOE analysis or root cause analysis?
Let assume a leak has been reported in the following pump system. As a result there is 1 inch of water on the floor. To identify the failure a root cause analysis (RCA) needs to be performed. To ...
- 7,125
2
votes
What height is needed to drop a 72 kg mass to impart a 5000g shock onto a test piece
it depends on how far your steal drop table travels after hitting the sample, the less travel the greater g.
The kinetic energy of the drop table when it hits the sample is $$KE=1/2mv^2 \quad and\ v=\...
- 22.1k
2
votes
How should the assignment to test software for a vehicle’s VCU be aproached?
I am not too familiar with the VCU, PV780, or PowerVision. Based on your description PV780 can be configured to be the Instrument Cluster Panel (ICP) for Engine Control Unit/Module (ECM) or ...
- 7,125
2
votes
What ASTM standard would be appropriate for testing the breaking strength of nylon ropes
Go directly to the ASTM site. I put "nylon rope" in search and it said there were 154 possibilities.
- 6,112
2
votes
Accepted
Testing specimens by dropping a ball on them and counting the number of drops required before the collapse. A better way?
It sounds like you could modify the procedure and equipment used for a soil standard penetration test (ASTM D1586). In this test, a hammer of specific weight is dropped a specific distant to strike ...
- 10.7k
1
vote
C# classes through labVIEW?
The way to do this is to make the build target a dynamic linking library (.dll).
Then all you need to do is read up a (relatively) clean application note on how to link to the dll file through ...
- 24.3k
1
vote
What ASTM standard would be appropriate for testing the breaking strength of nylon ropes
Probably ASTM A931 - 18 Standard Test Method for Tension Testing of Wire Ropes and Strand
There are others closely related but not exactly the same.
ASTM F3410 - 19 Standard Test Method for ...
- 24.3k
1
vote
Accepted
DOE analysis or root cause analysis?
I think you might be mixing up the intentions of the two analysis tools you you mentioned - Root Cause Analysis and Design of Experiments. Consider thinking of it this way:
Root Cause Analysis is ...
- 106
1
vote
How to cut Silicone and leave smooth edges?
A laser would be the best method followed by repetitive razor slicing in ever deeper cuts to avoid frictional deformation. Another method would be cold cuts by freezing the silicone and using a ...
- 964
1
vote
Test UV protection on sunglasses
The only real way to test this is to get a stable UV source and a diode that can detect that UV.
Measure the relative voltages from the diode with and without the sunglasses, and then you will know ...
- 296
1
vote
Validation of Lightweight Chassis (measuring deflection of structures/strain gauging)
Just seen this, you should set some fixed points, from the floor for example and then you can measure the deflections / changes as you apply the loads to specific points - you don't mention how you ...
- 15.5k
1
vote
Accepted
What is a method to detect thermal oxide layer after steel is painted?
This article written on May 02 2012 states that no non-destructive methods exist currently, other than a scanning Kelvin probe (which requires long measurement times).
However, it states that ...
- 1,284
Only top scored, non community-wiki answers of a minimum length are eligible