This paper puts forward a scheme to form perlite sound absorption boards by vibration molding according to the material properties and the characteristics of vibration forming method. In the trial, the feasibility and reliability of this method were confirmed by studying the effect of working pressure, frequency and vibration force on the quality of the perlite sound absorption board. Besides, ...

The possibility of using tree prunings residues from four wood species grown in Saudi Arabia to create cementbonded particleboards (CBPs) was studied. The properties of the produced CBPs at different board densities were evaluated. Panels were made using three different board densities (1100, 1200 and 1300 kg/m) at a constant wood/cement ratio (1/2 by weight). The mechanical properties and dime...

In this paper, a comparative investigation of different random modulation schemes against the normal pulsewidth modulation (PWM) for the DC motor drive with step-down chopper (buck) and half-bridge configuration is presented. For this purpose, an experimental setup with DSP2 board has been developed. The board consists of the signal processor TMS320C32 which is suitable for verifying the differ...

Computer vision based projector-camera calibration approaches usually involve with complex geometry transformation and trivial operations, mostly inappropriate for scenarios that under poor illumination or interfering background. An automatic geometric correction method for projector using projection board embedded with optic sensors is proposed, aiming at simplifying the calibration operations...

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In this work, ceramsite was utilized to fabricate the sound-absorbing boards, in which two types of structure were considered, specifically, single-layer board with homogenous and double-layer gradient structure. The physical, mechanical acoustic properties these prepared sound absorbing boards studied, including bulk density, compressive strength, flexural softening coefficient, absorption coe...

This paper describes the first successful attempt to detect wake vortices axially using an on-board infrared pulsed Doppler LiDAR (Light Detection And Ranging). On-board axial detection is more complex than the classic ground-based tangential approach, because the axial air speed in vortices is low and the atmospheric particle density is reduced, yielding a poorer SNR. To provide meaningful res...