Use of Impact Test with SW Trigger(DAQmx) vi
Hello,
I working on modal analysis (with hammer) and so I am trying to use Impact Test with SW Trigger(DAQmx) vi but I don't get signal of the acceleration (should be acquire as voltage), whereas I get the impact. And when I impact the beam I have an error message which says the sampling frequency should be more than 0.
thanks for your help
Hi,
Can you check the "physical channels (stimulus and response)" input to ensure that you have at least 2 signals? I get this error when I am selecting only one channel.
Hope this helps,
Charlotte F. | CLAD
National Instruments France
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>> "Du 11 octobre au 17 novembre, 2 sessions en parallèle : bien démarrer - approfondir vos connais...
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I am newbie in labviewprogramming. Then I have enquiries about my project which is using labview. I amusing impact test with NI DAQ 6251, impact hammer B&K 8200 andaccelerometer B&K 4371 then attach it in a structure. I have done somenecessary setting and it works. I can get some graphical result for magnitude (dbchecked) phase, coherence and others are works too.
But, it is very important to meto get the value of the force when I hit the structure with the hammer. I shouldget this force value, to make the amplitude respond from accelerometer relativelycompared by the force. Can any one helpme what should I do with – especially – the labview program, so that it canresult in the force data. Then, how to get the value of the amplitude per force(m/N, in Y axis) versus the frequency (in x-axis) in a graph/chart. I really needyour help for my research.recommend that you refer to related discussion:
http://forums.ni.com/ni/board/message?board.id=231&message.id=1258&requireLogin=False
Doug
NI Sound and Vibration -
NI-DAQmx: Impact Test real-imagine plot
Hello.
I am a student of mechanical engineering and I am not familiar with signal proccessing. I have to use LABView for a measurement experiment. In that project I have to use an impact hammer and an accelerometer to test surfaces of some specific meterials. My teacher tell me that I have to take the real-imagine plot of undamaged pieces as a model so I can use them at future for model. My problem is that the code I had write or the one that I use form NI example (NI-DAQmx: Impact Test) returns me a messy plot no matter how many hits I made. My teacher said me that as many hits I do the plot will be more clear but he cannot figure out what goes wrong either cause he is not familiar with labview neiher.
I wrote two different codes one using ready VI's and one that made the mathematic as my theory book say.
Please help me cause I am in a dead-end and can't move on with that.
I can post images from my codes or how I use the NI-DAQmx: Impact Test.
Thank you!Hi Albert,
An accelerometer is a type of sensor that is used to measure acceleration and output a corresponding voltage. Using Data Acquisition (DAQ) hardware, you can acquire the voltage from the accelerometer. However, most accelerometers will need some form of current excitation, typically IEPE Excitation which is a widely used standard. You can view these sites for a discussion of Accelerometer Principles and Types of Accelerometers.
Some DAQ cards are custom built to not only acquire the voltage but to supply the excitation current at the same time, specifically Dynamic Signal Acquisition (DSA) cards. An acceleration task is an instance of a DAQmx input task specially created for measuring accelerometers. You can programmatically configure the task in the LabVIEW or create the task in Measurement and Automation Explorer (MAX), as seen in this Knowledge Base. You will notice in the screenshot below, when configuring an acceleration task in MAX, you can supply values for the accelerometer's sensitivity, units, and the amount of current needed by the accelerometer. All of these values can be found in an accelerometer's specifications document. By entering these values, an acceleration task will allow you take the voltage measurements and scale them into g's or whatever unit your accelerometer measures. This way you do not have to create a custom scale yourself.
Hope this explanation helps.
Regards,
Mallori M.
Mallori M
National Instruments
Global Customer Education Program Mananger
Calculate the time you will save with NI Training
Attachments:
ScreenHunter_01 Dec. 02 21.42.PNG 39 KB -
Use M-Series cards with DAQmx in Matlab!
Hi DAQers!
Who is this message for?
For all people wanting to use their M-Series cards (and/or NI_CAQmx drivers) with Matlab.
Content:
Basic introduction into importing DAQmx into Matlab. Simple AI (analog input), advanced AI (synchronous)
and simple AO solutions are displayed with Matlab source code.
Motivation:
There's probably little disagreement that the new M-Series cards are superior to the old E-Series cards.
However, Matlab does (as of February 2005) not support either directly.
By buying the Data Acquisition Toolbox you can access most of the E-Series' functions from within Matlab.
But this will not help you with your new M-Series card! But it is possible to use M-Series cards with Matlab.
First step
Start by loading the NI dll:
funclist = loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni')
(You can choose any alias as long as it is a legal variable name.)
If your version of Matlab is too old to provide the "loadlibrary" function directly, download it here:
http://www.codeproject.com/dll/MatlabGenericDll.asp?df=100&forumid=26247&exp=0&select=972623
After importing, you see the list of available functions.
You can also display them by
libfunctionsview('myni')
That's basically it. By using the National Instruments NI-DAQmx C Reference manual and libfunctionsview('myni')
you have access to those functions. One special thing you need to keep in mind is the fact that pointers
work differently in Matlab than in C. This problem can be solved by using the Matlab function "libpointer".
Sometimes Matlab does not require a pointer when C would. But I found that it does not hurt to
specify a pointer in this case. Whether Matlab expects a pointer can be seen in the output
created by libfunctionsview('myni')
The general syntax for calling DAQmx functions is:
[outputarguments]=calllib(alias,NIDAQmx_functionname,inputarguments)
My next message will show a function I wrote that enables basic and advanced analoginput.
JensHi!
As promised, my Matlab function to use the M-Series card with Matlab.
I have the bad habit of programming in German and English at the same time.
I tried to correct that for this posting. I hope I succeeded!
I wrote this function to suit my needs -which it does.
Feel free to modify it to suit yours.
Jens
Edit: I just saw that my m-File is longer than 5000 characters! #duh#
Sorry!
I'll see if I can get a download up!
Here's the abbreviated m-file without synchronous AI:
function messmatrix=NImess(synchron,trigger,numofchans,samprate,samptime)
funclist = loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni');
disp('NI: Create Tasks')
taskh1=uint32(1);
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taskchans1=['Dev1/ai0:' num2str(numofchans-1)];
[a,b,c,d] = calllib('myni','DAQmxCreateAIVoltageChan',uint32(taskh1),taskchans1,'',-1,-10,10,DAQmx_Val_Volts,'')
nsample=samprate*samptime; %
disp('NI: Config Sample Clock')
[a,b]=calllib('myni','DAQmxCfgSampClkTiming',taskh1,'',samprate,DAQmx_Val_Rising,...
DAQmx_Val_FiniteSamps,nsample)
disp('NI: Config Digital edge start trigger')
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else
[a]=calllib('myni','DAQmxDisableStartTrig',taskh1)
end
disp('NI: Start task(s)')
[a]=calllib('myni','DAQmxStartTask',taskh1)
DAQmx_Val_GroupByScanNumber = 1;
readarray1=ones(numofchans,nsample);
readarray1_ptr=libpointer('doublePtr',readarray1);
sampread=0;
sampread_ptr=libpointer('int32Ptr',sampread);
empty=[];
empty_ptr=libpointer('uint32Ptr',empty);
arraylength=nsample*numofchans; % more like "buffersize",
disp('NI: Reading Data!')
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messmatrix=[readarray1'];
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[svn:bz-trunk] 19333: Rewrite these two tests with MXUnitManager instead of using tags.
Revision: 19333
Revision: 19333
Author: [email protected]
Date: 2010-12-13 13:31:42 -0800 (Mon, 13 Dec 2010)
Log Message:
Rewrite these two tests with MXUnitManager instead of using tags.
Modified Paths:
blazeds/trunk/qa/apps/qa-regress/testsuites/mxunit/tests/remotingService/dataTypes/amf/in heritPropsTest.mxml
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How to judge correct rap in impact test
Hi,guys
I get a trouble during my impact test project.
I use PCI-4472 and one module hammer connect to channel 0 and one accelerometer connect to channel 1.
hammer as trigger of accelerometer to get impact response.
My question is
1) I need make sure the rap of hammer only once in each impact action. if yes, then record related response from accelerometer, if no, I need repeat impact action without record response. how can i check that?
2) for this case, if I need average yet? ( I saw the SVXMPL_impact test(DAQmx).vi, it take some average computed for data, but for my application,since the impact only once each time, then if I can ignore the average function? I have few knowlegae about average theory.)
3)how much samples I should use?
Thanks for any help
TimTo 1)
How do you see a double rap?
I assume you take a look at the hammer signal and look for more than one peak. Well do the same in LabVIEW. Hint:
Waveform Peak Detection VI
Owning Palette: Waveform Monitoring VIs
Requires: Full Development System
Finds the locations, amplitudes, and second derivatives of peaks
and valleys in Signal In. Wire data to the Signal
In input to determine the polymorphic instance to use or manually select the
instance.
This VI is similar to the Peak Detector VI.
If you search the overall max or min with
Waveform Min Max VI
Owning Palette: Analog Waveform VIs and
Functions
Requires: Base Package
Determines the maximum and minimum values and their associate time
values for a waveform.
you can determine a useful relative threshold.
To 3)
What is the lowest frequency you want to detect? You should at least capture 1 period. Together with pretrigger and windowing go for 2 periods
What is the highest frequency you expect? For impact choose your sample rate at least 10x better 100x times higher. (Some say choose the highest you can get to avoid phaseshifts due to the aliasing filter)
Both values will give you the number of samples.
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Henrik
LV since v3.1
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Who can help me with a trigger?
Hi, I've got a little problem with my database that can be solved, or so I think, with a trigger. First of all, here it is.
create table utente
(id_utente number(5) Primary Key,
nome varchar2(40),
sexo varchar2(1) check (sexo='M' or sexo='F'),
morada varchar2(60),
data_nascimento date,
contacto number(10),
numero_BI number(9)
create table servico
(id_servico number(5) Primary Key,
descricao varchar2(40),
valor number(5),
data_inicio date,
data_fim date,
check (data_fim>=data_inicio)
create table modalidade
(id_modalidade number(5) Primary Key,
descricao varchar2(40),
valor number(5)
create table quarto
(id_quarto number(5) Primary Key,
descricao varchar2(40)
create table inscricao_servico
(id_inscricao_servico number(5) Primary Key,
id_servico number(5) references servico(id_servico),
id_utente number(5) references utente(id_utente),
data_pagamento date
create table inscricao_mod
(id_inscricao_mod number(5) Primary Key,
id_modalidade number(5) references modalidade(id_modalidade),
id_utente number(5) references utente(id_utente),
data_inscricao date,
data_cessacao date,
check (data_cessacao>data_inscricao)
create table estadia
(id_estadia number(5) Primary Key,
id_utente number(5) references utente(id_utente),
id_quarto number(5) references quarto(id_quarto),
data_entrada date,
data_saida date,
check (data_saida>data_entrada)
create table pag_mensalidade
(id_pag_mensalidade number(5) Primary Key,
id_inscricao_mod number(5) references inscricao_mod(id_inscricao_mod),
mes_mensalidade number(6),
data_pagamento date,
unique (id_inscricao_mod,mes_mensalidade)
insert into utente values (1, 'Manel', 'M', 'Rua grande', to_date('80.02.02','yy.mm.dd'), 123456789, 687654321);
insert into utente values (2, 'Artur', 'M', 'Rua pequena', to_date('81.03.04', 'yy.mm.dd'), 223456789, 587654321);
insert into utente values (3, 'Cardoso', 'M', 'Rua estreita', to_date('82.04.05', 'yy.mm.dd'), 323456789, 487654321);
insert into utente values (4, 'Abílio', 'M', 'Rua larga', to_date('79.07.06', 'yy.mm.dd'), 423456789, 787654321);
insert into utente values (5, 'Antunes', 'M', 'Rua nova', to_date('79.06.01', 'yy.mm.dd'), 423557982, 387654822);
insert into modalidade values (1, 'Total', 800);
insert into modalidade values (2, 'Diurno ate 18', 600);
insert into modalidade values (3, 'Diurno ate 22', 700);
insert into quarto values (1, '412');
insert into quarto values (2, '413');
insert into quarto values (3, '414');
insert into quarto values (4, '415');
insert into quarto values (5, '416');
insert into servico values (1, 'Excursao a Fatima', 150, to_date('11.05.13', 'yy.mm.dd'), to_date('11.05.13', 'yy.mm.dd'));
insert into servico values (2, 'Ida ao cinema', 10, to_date('11.08.22', 'yy.mm.dd'), to_date('11.08.22', 'yy.mm.dd'));
insert into servico values (3, 'Apoio domiciliario', 100, to_date('11.07.01', 'yy.mm.dd'), to_date('11.07.31', 'yy.mm.dd'));
insert into estadia values (1, 1, 1, to_date('11.05.05', 'yy.mm.dd'), null);
insert into estadia values (2, 2, 2, to_date('10.01.02', 'yy.mm.dd'), null);
insert into estadia values (3, 3, 3, to_date('09.12.15', 'yy.mm.dd'), to_date('10.02.25', 'yy.mm.dd'));
insert into inscricao_mod values (1, 1, 1, to_date('09.12.15', 'yy.mm.dd'), null);
insert into inscricao_mod values (2, 2, 2, to_date('11.11.11', 'yy.mm.dd'), null);
insert into inscricao_mod values (3, 1, 3, to_date('10.04.10', 'yy.mm.dd'), to_date('11.09.21', 'yy.mm.dd'));
insert into inscricao_servico values (1, 1, 1, null);
insert into inscricao_servico values (2, 1, 2, to_date('11.10.01', 'yy.mm.dd'));
insert into inscricao_servico values (3, 2, 4, null);
insert into inscricao_servico values (4, 3, 5, to_date('10.12.12', 'yy.mm.dd'));
insert into pag_mensalidade values (1, 1, 201110, to_date('11.10.23', 'yy.mm.dd'));
insert into pag_mensalidade values (2, 2, 201111, to_date('11.11.27', 'yy.mm.dd'));
insert into pag_mensalidade values (3, 3, 201112, NULL);
insert into pag_mensalidade values (4, 1, 201111, NULL);
drop table estadia;
drop table inscricao_servico;
drop table quarto;
drop table pag_mensalidade;
drop table inscricao_mod;
drop table modalidade;
drop table servico;
drop table utente;
Ok, the problem is: the table 'estadia' means 'stay' and 'quarto' means 'room'. I need to, before inserting on 'estadia', to check if that room is available or not.
I may do this:
insert into estadia values (4, 3, *3*, to_date('09.12.15', 'yy.mm.dd'), to_date('10.02.25', 'yy.mm.dd'));
but if, after this command, i do this:
insert into estadia values (5, 4, *3*, to_date('09.12.15', 'yy.mm.dd'), to_date('10.02.25', 'yy.mm.dd'));
it accepts and it shouldn't, because I'm putting users 3 and 4 in the same room at the same time.
the 3rd field is the room id and the next two fields are the entry date (data_entrada) and the exit date (data_saida). If a room is related to a specific stay in which the exit date hasn't gone by, that room shouldn't be available. Also, the exit date may be null, meaning that the exit date is unknown.
I hope to have been clear about my question.
Thanks, ChiapaThis is a fairly easy business rule which can be implemented using triggers. Here goes.
Tables (my version):
drop table stay;
drop table room;
create table room
(room_id number not null primary key
,other_col varchar2(10) not null)
create table stay
(stay_id number not null primary key
,room_id number not null references room(room_id)
,arrive date not null check(trunc(arrive)=arrive)
,depart date check(trunc(depart)=depart)
,unique (room_id,arrive)
,check(arrive <= depart))
/The rule you are trying to implement is this one:
create or replace assertion no_overlap as
check(not exists
(select 'two overlapping stays for a room'
from stay s1
,stay s2
where s1.room_id = s2.room_id
and s1.stay_id != s2.stay_id
and (s1.arrive between s2.arrive and nvl(s2.depart,s1.arrive) or
s1.depart between s2.arrive and nvl(s2.depart,s1.depart))
/Sometime in a far far away future, we may be done now. That future has still to arrive though.
So here's the trigger-code and supporting objects:
create or replace procedure p_get_Lock(p_lockname in varchar2) as
pl_id number(38);
pl_return number;
pl_timeout number := 0;
begin
-- Go get a unique lockhandle for this lockname.
pl_id := dbms_utility.get_hash_value(name => p_lockname
,base => 1
,hash_size => power(2,30));
-- Request the application lock in X-mode.
pl_return :=
dbms_lock.request(id => pl_id
,lockmode => dbms_lock.ssx_mode
,timeout => pl_timeout
,release_on_commit => true);
if pl_return not in (0,4)
then
raise_application_error(-20000,'Could not serialize for business rule.');
end if;
end;
create global temporary table stay_te
(room_id number not null)
create or replace trigger stay_aiur
after insert or update on stay
for each row
begin
if inserting or
(updating and (:new.room_id != :old.room_id or
:new.arrive < :old.arrive or
:new.depart > :old.depart))
then
insert into stay_te(room_id) values(:new.room_id);
end if;
end;
create or replace trigger stay_aius
after insert or update on stay
begin
for r in (select distinct room_id
from stay_te)
loop
p_get_lock(to_char(r.room_id));
declare
p_error varchar2(80);
begin
select 'Overlapping stays for room '||to_char(r.room_id)||'.'
into p_error
from dual
where exists
(select 'two overlapping stays for a room'
from stay s1
,stay s2
where s1.room_id = s2.room_id
and s1.room_id = r.room_id
and s1.stay_id != s2.stay_id
and (s1.arrive between s2.arrive and nvl(s2.depart,s1.arrive) or
s1.depart between s2.arrive and nvl(s2.depart,s1.depart))
raise_application_error(-20000,p_error);
exception when no_data_found then
null;
end;
end loop;
delete from stay_te;
end;
/Haven't tested it, but I think it's all okay.
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