An acoustic metamaterial is evaluated successfully as a means to reduce axial fan noise in an IT server rack application. The continuing growth demand for cloud-based memory storage outpacing sustainable energy management which still requires the fundamental component temperature control technologies. As chip temperatures increase, additional numbers of more powerful fans are required run faste...

Severe oil particle-induced erosion to the prestage component progressively degrades overall performance of deflector jet servo valve (DJSV), even leading failure. Herein, we present an approach for evaluating degradation in and predicting lifespan DJSV on different levels pollution. Specifically, a mathematical model whole was built based previously established working principle physical mecha...