Biased Hall effect sensor and NI 9201 module. How can I calculate the velocity of an object?
For my final year project at university I have designed and built a drop tower for testing the energy dissipation performance of test pieces.
In the system I specified having a biased Hall effect sensor (gear tooth sensor) to calculate the speed of the impactor by having a serrated target (ferritic) moving past it.
The idea behind having a serrated target was to enable an average of several readings of time period to be taken, then to use this to divide the known length of the serrations to calculate speed.
The problem I am having is when using the time period measuring block in LV it only wants to measure the period of the first wave, is there any way I could get LV to measure all four periods (there are four serrations) and average them?
Here is an image of the target incase what I have said was a little confusing: http://tinypic.com/r/2a0b8ck/6
Any help will be greatly appreciated!
1. The NI 9201 has only analog inputs, so you have no other choices with that devices. I did not look it up before my earlier response. Something about the wording of your first post made me think you were measuring the period with a counter.
2. I am not sure which "time period measuring block" you are using. Please post your VI. Before you post it, run it with your Hall sensor so that you have some data recorded. Go to the Edit menu and choose Make Current Values Default." Save the VI. The indicators on your VI will then have your data saved. Post that VI.
3. I am assuming that you will get a signal which looks something like this, although not necessarily starting exactl at zero time or having exactly uniform spacing between the pulses.
Using some simple logic you can determine the time of the transitions between high and low. The differences between the times of successive transitions are your periods. For the image above the falling edges (going from +1 to -1) occur at about 64, 192, 320, and 448. The differences are 128 in each case. For your impact data the differences are likely to not all be the same as yout target decelerates.
After I see you VI, I can give some suggestions about how to proceed to calculate the differences.
Lynn
Similar Messages
-
I have forgotten my password and locked my phone, how can i clear the problem
I have forgotten my password and locked my phone, how can i clear the problem
By coincidence, this happened to my son just last night. You do NOT have to restore it to a new phone, but you probably want a current backup.
Luckily, you can still sync and back it up even if it's locked, so connect it to the computer you usually sync it to. Go to the summary page. It's easiest and fastest to use a local backup, so if iCloud backup is on, turn it off and click "Backup now".
After it backs up, either click "Restore iPhone", or
- hold home and the top button until the screen goes black, release the top and continue to hold the home button until iTunes says "iPhone in recovery mode detected".
Follow instructions to restore from backup, and then sync to restore content. Your phone will come up in an unlocked state. If you have any stuff that was purchased directly to the iPhone (only), you'll have to re-download it.
Remember to turn iCloud backups back on if you use them.
If you don't sync you iPhone to a computer then I *think* those instructions with the buttons will put it into a mode where you can restore it from the cloud (make sure it is NOT connected to a computer while you do this). Otherwise, you will have to restore it as a new phone, then go to settings, reset, then restore it from the cloud. -
I have created a Blog in iWeb and uploaded it to an FTP server. It works fine, except that the 'Comments' facility is missing. When I upload the blog to MobileMe the 'Comments' facility is there and working great. How can I solve the problem on the FTP server Blog.
You haven't a problem. You simply did not read the iWeb Help :
-
I updated my ipad 3 to iOS 6. now my appstore shows chinese apps and prices in rmb. how can i change the settings?
Change home country
1. App Store>Featured>Apple ID (at bottom of page)
2. Tap on Apple ID>View Apple ID
4. Enter your password
5. Country/Region>Change Country or Region -
hello i would like to stop using outlook (office 2011) and use instead "mail": how can i transfer the database?
Hello Sylviefrombuenosaires, here is a link from macworld that can solve your question. Try reading this.
http://www.macworld.com/article/158112/2011/02/export_outlook_ical.html
Carlos -
I'm using Photoshop Elements 12 on Windows 8.1. When I go into the Expert Edit Mode the toolbar available appears in one single column and misses off several tools including foreground and background colour. How can I restore the original toolbar?
Thanks for your help - your suggestion worked beautifully.Dennis Hood
From: 99jon <[email protected]>
To: Dennis Hood <[email protected]>
Sent: Thursday, 15 January 2015, 15:20
Subject: I'm using Photoshop Elements 12 on Windows 8.1. When I go into the Expert Edit Mode the toolbar available appears in one single column and misses off several tools including foreground and background colour. How can I restore the original toolbar?
I'm using Photoshop Elements 12 on Windows 8.1. When I go into the Expert Edit Mode the toolbar available appears in one single column and misses off several tools including foreground and background colour. How can I restore the original toolbar?
created by 99jon in Photoshop Elements - View the full discussionTry re-setting the prefs.Go to: Edit >> Preferences >> General (Photoshop Elements menu on Mac)Click the button Reset Preferences on next Launch If the reply above answers your question, please take a moment to mark this answer as correct by visiting: https://forums.adobe.com/message/7099161#7099161 and clicking ‘Correct’ below the answer Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: Please note that the Adobe Forums do not accept email attachments. If you want to embed an image in your message please visit the thread in the forum and click the camera icon: https://forums.adobe.com/message/7099161#7099161 To unsubscribe from this thread, please visit the message page at , click "Following" at the top right, & "Stop Following" Start a new discussion in Photoshop Elements by email or at Adobe Community For more information about maintaining your forum email notifications please go to https://forums.adobe.com/thread/1516624. -
Remember only the icloud email address, forget the password, birthdate, and verification questions. How can i get the icloud email back?
Go to https://getsupport.apple.com ; click 'See all products and services', then 'More Products and Services, then 'Apple ID', then 'Other Apple ID Topics' then 'Forgotten Apple ID security questions'.
-
I have tried resetting an iPhone 3 and I am unable to activate and sync it. How can I reset the device without using a computer?
Hello anacc,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
iOS: Unable to update or restore
http://support.apple.com/kb/HT1808
Connect your USB cable to your computer but not to the iPhone, iPad, or iPod touch until step 3.
Turn off the device: Press and hold the Sleep/Wake button for a few seconds until the red slider appears, then slide the slider. Wait for the device to turn off.If you cannot turn off the device using the slider, press and hold the Sleep/Wake and Home buttons at the same time. When the device turns off, release the Sleep/Wake and Home buttons.
While pressing and holding the Home button down, connect the USB cable to the iPhone, iPad, or iPod touch. The device should turn on.
Continue holding the Home button until you see the Connect to iTunes screen. When this screen appears, you can release the Home button:
Note: If the image of a battery appears, let the device charge for at least ten minutes to ensure that the battery has some charge, and then start with step 2 again. If you don't see the Connect to iTunes screen, try these steps 1 through 4 again.
iTunes should automatically open and display the following message:
"iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes."Note: If iTunes not open after two minutes, please open iTunes yourself.
Use iTunes to restore the device.
Best of luck,
Mario -
I already have 5 computers that authorized this account, but I lost 1 and 1 broke. How can I remove the computer off the account?
About Authorization and Deauthorization of iTunes - http://support.apple.com/kb/HT1420.
-
I have a MacBook that is synced with my ipad. My daughter has an Iphone4 and no computer. How can we use the one computer for both devices that are unique and keep them separate. thank you for your help!
This should help:
How to use multiple iPods, iPads, or iPhones with one computer
Regards. -
I merged my Apple ID accounts on my iPhone and iPod...how can I change the iPhone Apple ID account so that the iPod and iPhone has there own?
I think I understand what you mean. You were asked if you wanted to merge the contacts with your iCloud account. Contacts take up very little room and are probably not the reason that your iCloud is full. If you're now backing up two devices to iCloud rather than one, that will indeed take up more room.
You cannot undo the contact merge. You can go to Settings>iCloud on either device and see what categories of stuff you're backing up and make selections. You can also purchase more iCloud space there. -
I use LabWindows/CVI and SCXI modules, how can i check the polarity of a capacitor during an ICT?
I am a newbie using CVi Lab Windows and SCXI modules, how can i perform ICTs to check the proper polarity of a capacitor?
Hello,
That's a big question for a single sentence. Could you give some more details about the hardware you have, and the measurements you want to take?
By the way, when you say ICT, do you mean In-Circuit Test or something else?
Thanks,
John N
Applications Engineer
National Instruments -
How can I calculate the load from all modules in ECC6.0 for our production
Hello Experts,
I have doubt , how can I check the load from all modules like FI, SD, MM, HR, PP, BASIS, ............etc from sap level. Can you explain from which transaction and how to check the workload for each module seperately from sap level. We are wondering about the size utilization of each module. Our production database is R3 ECC 6.0 on Oracle 10.2 on AIX operating systems.
Thanks for your help in this regard.
Thanks & Regards,
Haseem.Hi
Check in ST07 the application monitor.
Regards
Bhaskar -
How can I calculate the count of each row and they are grouped in each mth?
hi, I need help on a database question. How can I count the number of record grouped by the last 12 months? I don't know any way to iterate the month one by one so that it return a table like this:
table_item
id item
1 A
2 B
3 C
4 D
table_record
item date
A 2006-01-01
A 2006-01-01
A 2006-01-01
B 2006-02-01
A 2006-03-01
C 2006-04-01
A 2006-04-01
D 2006-05-01
A 2006-05-01
A 2006-12-01
and I need a query to output following table:
item_count_in_2006
item 06-01 06-02 06-03 06-04 06-05 06-06 06-07 06-08 06-09 06-10 06-11 06-12
A 3 1 1
B 1
C 1
D 1
I tried so many way to do it.. I think SQL can't even product a table like that. Please give me some comments.
Thanks!select c1,
count(decode(to_char(c2,'YYYYMM'),'200601',1)) "200601",
count(decode(to_char(c2,'YYYYMM'),'200602',1)) "200602",
count(decode(to_char(c2,'YYYYMM'),'200603',1)) "200603",
count(decode(to_char(c2,'YYYYMM'),'200604',1)) "200604",
count(decode(to_char(c2,'YYYYMM'),'200605',1)) "200605",
count(decode(to_char(c2,'YYYYMM'),'200606',1)) "200606",
count(decode(to_char(c2,'YYYYMM'),'200607',1)) "200607",
count(decode(to_char(c2,'YYYYMM'),'200608',1)) "200608",
count(decode(to_char(c2,'YYYYMM'),'200608',1)) "200609",
count(decode(to_char(c2,'YYYYMM'),'200610',1)) "200610",
count(decode(to_char(c2,'YYYYMM'),'200611',1)) "200611",
count(decode(to_char(c2,'YYYYMM'),'200612',1)) "200612"
from tbl
group by c1
C 200601 200602 200603 200604 200605 200606 200607 200608 200609 200610
D 0 0 0 0 1 0 0 0 0 0 0 0
A 3 0 1 1 1 0 0 0 0 0 0 1
B 0 1 0 0 0 0 0 0 0 0 0 0
C 0 0 0 1 0 0 0 0 0 0 0 0Nicolas. -
i recently got iphone 4 , yesterday i was trying to install an application from the itune store it say that i need to authorize it ( i already have an account and bought some apps ) and there was a CLICK HERE BUTTON , when i press on it it take me a to a page that require some kind of activation code or smthn like that ,
how can i authorize the device ?
and btw i bought it from UAE store
IOS 4.3.2You should only make purchases for all your devices using a single Apple ID. There is no need, and indeed a good reason not to, set up a new Apple ID with each new device purchase. While items purchased under different IDs can be played on a single device, you cannot merge Apple IDs and it makes it cumbersome.
Apple IDs do not expire but may become dormant and require reactivation if they are not actively used.
You should make note of your Apple ID and passwords and keep a record of it. Like a bank account it contains access to items with value. Update your Apple ID email address as they change.
I see you were guided to this forum by a help page on recovering your password. If that is not sufficient try the links below. Apple will need to verify you are indeed to owner of the accounts to which you are trying to gain access.
http://www.apple.com/support/appleid/contact/
Contact Apple for help with Apple ID account security - http://support.apple.com/en-us/HT5699 "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."
Frequently asked questions about Apple ID - http://support.apple.com/kb/HE37
Maybe you are looking for
-
Reports output to file has garbage
Using Report Builder 6.0.5 on NT, I have a report that prints perfectly. I'd like to have the same report sent to a text file if the user selects File as the Destination Type. Indeed, the file gets created in the specified directory, but the contents
-
Showing Percentages on an axis in discoverer
Hi all I am using Discoverer to show some percentages on screen. When i put the percentages into a graph though the axis shows the values as being 0.00, 0.10, 0.20, etc. I'm probably missing something really obvious, but could some one possibly tell
-
We need more ePublishing support!!!!
I'm still trying to figure out what works in ePub as opposed to print documents. Unfortunately the documentation doesn't bother to tell you what does and doesn't work. The truth seems to be very little transfers. What we need. We need proper format t
-
EXBED and BEDINV in the table J_1IEXCDTL
Hi, We have one depot plant, so as per std. procedure first we make as per PO first we make the GR then ref. to GR number RG23D register updation with J1IG transaction ref. to GR number and all the bed amount, ECS and SECESS with amount and % enter m
-
No numlock?? Logitech s530 laser wireless keyboard for mac
i know iit exists because i did it a few weeks ago, but now i can't find anything when i google this shortcut. Please help! i need to get some work done..