Determination and analysis of vibration behavior of structures for at least first few natural frequencies and mode shapes needs several sensors to be connected at different non node points and exciting the structure at one point. Other method for determination of first few mode shapes is to excite several points of the structure at once and sensing the response from one point.  Both methods nee...

A system for the measurement of accelerometer shock sensitivity is described, complying with the requirements of comparison calibration per ISO 16063-22 “Methods for the calibration of vibration and shock transducers Part 22: Shock calibration by comparison to a reference transducer”. This system is comprised of a newly designed exciter, a new back-to-back comparison standard with integral char...

As important special engineering equipment, tamper is used to complete the work of construction and maintenance in the railway field. In the present market, tampers are mostly mechanically driven and exist technical limitations. A new electro-hydraulic exciter applied on new tamper is proposed. It is mainly composed of new spin valve and new micro-displacement oscillation cylinder. In the paper...

Shock attenuation is a significant aspect of shockproof design. The aim this study to explore the use lattice structures for shock isolation applications. Five were fabricated using photopolymer resin and subjected quasi-static compression tests under universal testing machine response pneumatic exciter. provided preliminary data on structure’s collapse modes, stress, strain, energy absorption....

A simple low-cost system for rapid identification of the cables causing ground loops in complex instrumentation configurations is described. The system consists of an exciter module that generates a 100 kHz ground loop current and a detector module that determines which cable conducts this test current. Both the exciter and detector are magnetically coupled to the ground circuit so there is no ...

Experiments were conducted to obtain the modal damping ratios of two hollow cylinders of different thicknesses of Aluminum. An electro dynamic exciter with slip table is used to excite the hollow cylinders. The hollow cylinder (unit under test) is fastened to the exciter. The exciter is placed in the horizontal direction and connected to the slip table. A control accelerometer is placed at the ...

The effect of the presence of a conditioned inhibitor on extinction of excitatory conditioning was studied in one magazine approach and three autoshaping experiments using rats and pigeons. In each case, the presence of an inhibitor reduced responding to an exciter during extinction but allowed substantial recovery of responding to that exciter when subsequently tested separately. Control stimu...

Abstract Indonesia has well natural resource potential, one of which is the wind energy potential can be utilized for electricity needs. However, utilization in still lacking. Therefore, it necessary to have a system utilizing with aim obtaining large electrical energy, Wind Power Plant (PLTB) system. Synchronous generators two important parts, namely main generator (Alternator) and exciter (Ma...