In order to improve the impact performance, the structure of hydraulic hammer should be optimized. In this paper, the ranges of eight vital structure parameters of piston and reversing valve system of hydraulic hammer were selected firstly; and then found the best value of different parameters under experiments with the method of computer optimization and the parametric analysis method provided...

A concert pianist is able to produce a wide range of imaginable nuances of musical expression by actuating the 88 keys on a piano, none of which travel through a distance greater than one centimeter. In this study, we investigated the temporal behaviour of grand piano actions from different manufacturers using different types of touch (‘legato’ versus ‘staccato’). An experimental setup consisti...

Sistem perpipaan pemadam kebakaran di perumahan Salonsa merupakan fasilitas yang vital, sistem ini tidak boleh rusak/gagal karena harus bisa digunakan pada tiap waktu. perppaan mampu bertahan dari fenomena water hammer menyebabkan fluktuasi tekanan. Akan dilakukan simulasi menggunakan software AFT Impulse dengan skenario valve hydrant ditutup cepat, dan pompa mati mendadak, untuk mengetahui efe...

The Front Cover shows the encapsulation of C60 by “iceberg” water, analogous to methodology authors implement acquire enhanced Raman spectra fullerene. More information can be found in Research Article Nathan I. Hammer and co-workers.

In this article, the two-phase water hammer theoretical and numerical simulation are provided. A mathematical formulation is presented to describe transient one-dimensional flow of bubbly gas-liquid mixtures without phase change in an horizontal pipe. The features two-fluid model for simulating flows investigated. governing equations were obtained from mass momentum conservation laws combined w...