The effects of punch angle in noise and force formation for sheet metal blanking process

The paper is concerned with the effect of punch angle (0°, 4°, 8°, 16°), sheet thickness (0.8, 2 mm), and punch speed (25, 37.5 mm / min) on the force formation and noise in the blanking of DP600 dual-phase steel sheet. The blanking experiments were carried out in a modular blanking die. The blanking force and noise variables were obtained simultaneously during the blanking using a load cell and noise measuring device, respectively. It was determined that the blanking force significantly decreased with an increasing punch angle, while noise formation decreased. The increase in the punch speed slightly increased the amount of noise while it did not affect the blanking force significantly.

Industrial Upper-Limb Exoskeleton Characterization: Paving the Way to New Standards for Benchmarking

Exoskeletons have been introduced in industrial environments to prevent overload or repetitive stress injuries in workers. However, due to the lack of public detailed information about most of the commercial exoskeletons, it is necessary to further assess their load capacity and evolution over time, as their performance may change with use. We present the design and construction of a controlled device to measure the torque of industrial exoskeletons, along with the results of static and dynamic testing of an exoskeleton model. A step motor in the test bench moves the exoskeleton arm in a pre-defined path at a prescribed speed. The force measured with a beam load cell located at the interface between the exoskeleton arm and the test bench is used to derive the torque. The proposed test bench can be easily modified to allow different exoskeleton models to be tested under the same conditions.

Unsteady force measurements on propeller model in cavitation tunnels

Object and purpose of research. This paper discusses longitudinal unsteady force dynamometer for cavitation tunnel tests. The purpose of the study is to improve metrological performance of the dynamometer and extend the scope of its application. Materials and methods. The study is based on metrological parameters of dynamometers and model test data available with KSRC Large Cavitation Tunnel (LCT). Main results. Development, manufacturing, certification and commissioning of longitudinal unsteady force dynamometer based on piezoceramic load cell with improved metrological performance making it applicable for model testing of not only propellers but also other types of marine propulsors. Conclusion. Dynamometer with piezoceramic load cell offers more accurate measurement of unsteady forces, wider band of measurement frequencies, as well as wider spectrum of possible applications and lower susceptibility to interference.

Rancang Bangun Alat Pemantau Infus Menggunkan Modul 433 Mhz dan Sensor Load Cell Berbasis Arduino Uno

Kesalahan dalam pemberian cairan infus dapat berakibat buruk kepada pasien, juga apabila terjadi masalah seperti penyumbatan atau kehabisan cairan jika tidak segera ditangani akan berbahaya bagi pasien. Infus yang ada saat ini penggunaannya masih secara manual dimana kesalahan seperti tersebut masih sering terjadi, oleh karena itu penulis membuat suatu infus yang dapat bekerja secara otomatis. Pada penelitian ini, penulis membuat suatu infus otomatis yang dapat memonitoring infus secara berkala, dimana dokter atau suster hanya tinggal memantau di tempat mereka berjaga. Sensor yang digunakan pada alat ini yaitu Modul RF 433 Mhz dan sensor berat (load cell) dengan bantuan Modul HX-711. Pada penelitian ini digunakan mikrokontroller Arduino Uno sebagai data untuk monitoring infus jarak jauh. LCD, buzzer dan LED digunakan sebagai output yang memudahkan dokter atau suster dalam memantau situasi infus. Hasil dari penelitian ini dimulai dari sensor berat dan Modul RF 433 Mhz yang mengirim data ke Arduino lalu kemudian di dalam Arduino data di proses sebelum mengaktifkan output berupa lampu LED untuk pemberitahuan kondisi infus telah habis atau infus sedang berhenti. Rancangan alat pemantau infus yang dibuat secara keseluruhan dapat bekerja dengan baik dan memungkinkan dapat diterapkan di rumah sakit.