Lectura de datos de aceleración y deformación, mediante la implementación de un sistema de adquisición de datos para el péndulo de impacto del grupo de investigación GDP

Abstract

In this curricular integration work, an acquisition system was implemented in the crash pendulum of GDP research group of Mechanic’s Faculty whose objective was to take acceleration data to obtain the fluctuation curves as a function of time and strain data to find the stress at a specific point due to the crash on a square section ASTM A36 steel specimen. For its implementation, National Instruments hardware and software were used, such as: NI Compact DAQ 9172 chassis, C series I/O modules: NI 9234, NI 9327 and NI 9944, for acceleration, strain and Wheatstone bridge connection, respectively; as sensors: BF-350 strain gauges and the IMI 603C01 piezoelectric accelerometer; Windows PC connected by USB with the 17. 0 LabVIEW version as development environment, whose connection with DAQ software was achieved by using the NI-DAQmx driver software. The sensors calibration consisted in get a calibration equation for the strain values and a correction factor for the acceleration values. The system validation, in the acceleration case, several tests were carried out to refine the resultant curve, getting an optimal configuration for the acquisition with 1000 samples for number of samples and 14000 Hz for sampling frequency. For strain, the theoretical values obtained from a simulation performed in ANSYS were compared with experimental values obtained by the acquisition system, resulting in an average error of 4.69%, thus concluding that the implemented system is valid due to the low error represented by its measurements. In subsequent works, this system will allow measuring important variables in the study and improvement of energy absorption properties in materials used in the industry.