Recent content by FAlonso

Dear all, Thanks a lot for your valuable inputs. I finally found the problem. It has nothing to do with COG at all. As per documents of similar hardware, COG can be offset by upto 20mm, and in my case it was 10.5 mm. The issue was the control sensor location. It was apparently too high on the...

Since it is a triaxial sensor, it can measure in all three directions. Each output is one "channel". I get movements/spikes on all three channels

Normally the gain is adjusted before starting the test. The measurement system conducts a "self check" and reports any deviation. So I do not think it is an issue. Maybe if I was performing the test following another test, it could be but I started test without any thing performed before it.

Thanks for the suggestion regarding strobe light. I will try that during next test. Regarding sensor, the one you see on top is a triaxial sensor. The sensor-Z is in vertial direction, Y points to the longer length of the object and X is hidden, pointing laterally (shorter length). My...

Yes I have tested with this box lying vertically on this U shaped plate too. In fact this fixture is supposed to test the specimen inside in all three axis. So 1 vertical and 1 horizontal orientations had no issue. The third one has issues. Referring to point regarding CG mentioned by JBA, I...

There is a small offset because the two plates at opposite ends are not same in mass. But I do not think that is an issue because I conducted a similar test where this object was rotated 90 degrees about its longitudinal axis, and I did not face any trouble in that test.

I totally agree. A winch system (rope/pulley) would be much more flexible and cheaper. Gearing would come with strict requirement on tolerances. Rack and pinion are not exactly known for load bearing capacities compared to other systems.

Hello everyone, I wanted to gather opinion from anyone experienced in vibration regarding one of test fixtures I have created for small satellites. The image below shows the Test-POD that I am testing on a single axis shaker. In one of the tests, I had troubles that the amplitude got higher than...

At bachelors level, one should remain in a field as broad as possible, to figure out what topics you like or dislike. I would suggest to get into industrial engineering, and then later on pick anything like systems engineering, data science, statistics for masters. That should give you a broader...

Chapman book is perhaps the widely used standard text on this subject.

Thank you Fervent for your input. You are right that thesis is always done with academia. However, you can sometimes opt for thesis in a company, where a supervisor from university supervises as well as one from industry. On numbers, yes I might count as experienced guy. But as I mentioned, my...

I am having a bachelors degree in Mechanical Engineering and worked in consumer products production industry for some 4 years. I decided to go for Aerospace Engineering masters, a complete change of track from my work experience, primarily due to my passion for aviation. I wanted to ask what...

Well Mechanical Engineering will always be in demand, although core of it is slowly dying. The reason being mechanical engineers are more inclined towards managing things now a days than design.

I would say could you explain a bit more on what you mean by the 'limits of keyways' ? Are you talking about its dimensions ? Generally keyways for a certain shaft size are found in standard charts employed by OEMs.

It's easier when it's fun. For someone even half interested in engineering, applications of things appeal more than the basics. Studying and understanding long derivations of some very basic concepts are necessary, however, one cannot find too much interest in it unless you get to know how it...