Water brake Dyno conversion to load cell
Water brake Dyno conversion to load cell
(OP)
I have just bought an old Froude Hofmann DPX2 water brake dyno. I am wanting to convert it to a load cell and run some software on my computer instead of all the manual calculations. I have found various free software versions on the net most of them want you to buy there interfaces (expensive £1000 or more). Dose anyone know of sensible priced interfaces or a way of getting it all to work. Below is a link to one of the software
http://www.sportdevices.com/download/index.htm
http://www.sportdevices.com/download/index.htm





RE: Water brake Dyno conversion to load cell
P=T*(rpm/60)*2*pi
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Water brake Dyno conversion to load cell
Thanks. But I can do the calculations, I would just like to have some software do it for me and maybe produce a graph (but not essential).
Mark
RE: Water brake Dyno conversion to load cell
If you are willing to create the graph after the dyno run is done you could use almost any two channel data logger, 2 signal conditioners with a analog-to-digital card in your computer, or even a signal conditioner/analog-to-digital combo that output data to the USB port. Then you can graph the data with the included software or a spreadsheet program like Excel. You might also be able to get a realtime readout if the software supports computed channels. I can't recommend any particular brands/models as you are not in the USA, but you should be able to find something that comes with a simple software package.
Have fun! ISZ
RE: Water brake Dyno conversion to load cell
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Water brake Dyno conversion to load cell
I too would be interested in anthing you have as I'll be doing much the same thing with a water brake, mine an uprated Heenan Froude G4.
Regards, John.
"It's not always a case of learning more, but often of forgetting less"
RE: Water brake Dyno conversion to load cell
RE: Water brake Dyno conversion to load cell
Here's a simple basic program that can easily be modified for realtime monitoring of the parallel port. Obviously your particular ADC won't use the same pins for the same functions.
CLS
base0 = &H378
PRINT "Power on and deselect adc"
OUT base0, &HA0
DIM v(12)
start:
INPUT "Enter -1 to finish"; jjj
IF jjj = -1 THEN GOTO finish
FOR n = 0 TO 11
v(n) = 0
cycle = 0
cyclestart:
cycle = cycle + 1
OUT base0, &H60 ' text says 80
v = v OR (INP(base0 + 1) AND &H10) * &H8
FOR clk = 1 TO 4
address = &H80 + &H40 * (n AND 2 ^ (4 - clk)) / 2 ^ (4 - clk)
v = v OR (INP(base0 + 1) AND &H10) * (2 ^ (8 - clk)) / &H10
OUT base0, address
OUT base0, address OR &H2
OUT base0, address AND &HFD
NEXT clk
FOR clk = 5 TO 8
v = v OR (INP(base0 + 1) AND &H10) * (2 ^ (8 - clk)) / &H10
OUT base0, &H82
OUT base0, &H80
NEXT clk
OUT base0, &HA0
DO WHILE test = 0
test = INP(base0 + 1) AND &H40
LOOP
IF cycle = 1 THEN
v = 0
GOTO cyclestart
ELSEIF cycle = 2 THEN
v(n) = v
END IF
NEXT n
IF v(11) > 130 OR v(11) < 126 THEN PRINT "adc error"
FOR n = 0 TO 11
IF n < 10 THEN v(n) = CINT(v(n) * 100 / 51.2) / 100
IF n = 10 THEN v(n) = v(n) / 10
PRINT n; ": "; v(n); " ";
NEXT n
PRINT
GOTO start
finish: PRINT "power down .."
BEEP
OUT base0, &H0
STOP
END
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Water brake Dyno conversion to load cell
I hope I'm not out of line here but if you do manage your upgrade I'd be interested in talking to you about your waterbrake.
Regards, Steve
RE: Water brake Dyno conversion to load cell
RE: Water brake Dyno conversion to load cell
Thanks. I am looking into A/D cards ant the software that comes with them. Will let you know how i get on.
Mark
RE: Water brake Dyno conversion to load cell
Mark
A/D converter http://www.audon.co.uk/labjack.html
Software http://www.audon.co.uk/daqfactory.html
RE: Water brake Dyno conversion to load cell
RE: Water brake Dyno conversion to load cell
http://www.depac.com/index.htm