Thank youView attachment 186262
Target supported by wires under tension.
From the readings of four strain gauges on the wires it should be possible to calculate where the ball hits and the force involved. The maths would be interesting .
Hola @Alec_tView attachment 186262
Target supported by wires under tension.
From the readings of four strain gauges on the wires it should be possible to calculate where the ball hits and the force involved. The maths would be interesting .
The 4 strain gauges would initially give readings for static loads. A hit would change all 4 readings and the relative magnitudes of those changes would be an indiction of where the hit occurred. The absolute magnitudes would need to be processed (trigonometry involved no doubt, I haven't gone into the maths) to come up with a value for impact force. Calibration would enable that to be converted to ball speed.Just for the challenge of something unusual for me, could you outline how you would do it?
Than you for your answer but It is not clear please explain it in details.Crude test of force attenuator. Using one element of matrix applied + 4.5 V to top of cell in series with 120 ohm sensing resistor, - return to other end of R. No cricket ball or baseball so dropped a 9 oz. rounded rock from 1 ft. O-scope read 2.5 V. covering cell with 2 cm. polyethylene foam, V = 1 V.
The way I undesrtand this up to now, the four strain gauges should be located perpendicular to the plane containing the target, isn't it?The 4 strain gauges would initially give readings for static loads. A hit would change all 4 readings and the relative magnitudes of those changes would be an indiction of where the hit occurred. The absolute magnitudes would need to be processed (trigonometry involved no doubt, I haven't gone into the maths) to come up with a value for impact force. Calibration would enable that to be converted to ball speed.
Thank youSize of target still unknown so I picked 1 meter X 2 meters with 200 pressure cells of 98 X 98 mm each.
A lead is brought out from each cell thru target to a LED latching circuit which could display a LED matrix on a 20 cm X 10 cm panel for hit location. A single output for all cells via large diode OR gate. is processed by a sample & hold circuit by others. Ideal diodes would be nice but expensive so might settle for 1N4048's. Shottky's seem to be a bit leaky. Figures for force of a soft hit or hard hit are not available to me so all of this is impure speculation.
thank youWill give it another go.View attachment 187033
by Steve Arar
by Steve Arar
by Jake Hertz