Acoustic control of a rocket fairing using spatially weighted transducer arrays

2000 ◽  
Author(s):  
Steven Lane ◽  
Jonathan Kemp ◽  
Robert Clark ◽  
Steven Griffin
Keyword(s):  
Acoustic Control ◽  
Transducer Arrays

Active Acoustic Control of a Rocket Fairing Using Spatially Weighted Transducer Arrays

2001 ◽  
Vol 38 (1) ◽  
pp. 112-119 ◽  
Author(s):  
Steven A. Lane ◽  
Jonathan D. Kemp ◽  
Steven Griffin ◽  
Robert L. Clark
Keyword(s):  
Acoustic Control ◽  
Transducer Arrays ◽  
Active Acoustic Control

Semi-Automated Packaging of Transducer Arrays for 3D Ultrasound Computer Tomography

2020 ◽  
Author(s):  
Martin Angerer ◽  
Michael Zapf ◽  
Benjamin Leyrer ◽  
Nicole V. Ruiter
Keyword(s):  
Computer Tomography ◽  
3D Ultrasound ◽  
Transducer Arrays

scholarly journals An Experimental Study of the Performance of a Crossed Rib Diffuser in Room Acoustic Control

2021 ◽  
Vol 11 (9) ◽  
pp. 3781
Author(s):  
Takumi Yoshida ◽  
Yasutaka Ueda ◽  
Norimasa Mori ◽  
Yumi Matano
Keyword(s):  
Sound Field ◽  
Wide Band ◽  
Scattering Coefficient ◽  
Scaled Model ◽  
One Dimensional ◽  
Broadband Absorption ◽  
Acoustic Control ◽  
Absorbing Layer ◽  
Speech Clarity ◽  
Reverberation Parameters

This paper presents a crossed rib diffuser (CRD) as an effective tool for room acoustic control. We performed an experimental investigation of its effectiveness using a specimen manufactured for this trial. The CRD is constructed by overlapping two one-dimensional (1D) periodic rib diffusers with different specifications so that they are crossed at non-right angles. The CRD achieves a higher scattering coefficient than 1D periodic rib diffusers in a wide band while maintaining the simple and friendly design of 1D periodic rib diffusers applicable to various architectural spaces. Moreover, inserting an absorbing layer between upper and lower ribs of the CRD, (CRD-A) yields a high broadband absorption coefficient. We first evaluated the random-incidence scattering coefficient of CRD using a 1/5 scaled model in comparison with those of 1D periodic diffusers assessed with a numerical method. Then, absorption coefficients for the CRD and the CRD-A were measured using a reverberation room. Subsequently, an experiment on a small meeting room with a 1D periodic rib diffuser, the CRD and the CRD-A was conducted to present performance of the CRD in room acoustic control. Impulse response measurements and evaluations of reverberation parameters (T20 and EDT) and speech clarity (D50) were conducted. Additionally, we present differences in structure of reflected sounds found for the flat wall, the CRD and the CRD-A visually using a four-channel sound field microphone.

scholarly journals Advanced Micro-Actuator/Robot Fabrication Using Ultrafast Laser Direct Writing and Its Remote Control

2020 ◽  
Vol 10 (23) ◽  
pp. 8563
Author(s):  
Sangmo Koo
Keyword(s):  
Three Dimensional ◽  
Processing Technique ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Precise Control ◽  
Two Photon ◽  
Non Invasive ◽  
Acoustic Control ◽  
Fs Laser ◽  
Invasive Control

Two-photon polymerization (TPP) based on the femtosecond laser (fs laser) direct writing technique in the realization of high-resolution three-dimensional (3D) shapes is spotlighted as a unique and promising processing technique. It is also interesting that TPP can be applied to various applications in not only optics, chemistry, physics, biomedical engineering, and microfluidics but also micro-robotics systems. Effort has been made to design innovative microscale actuators, and research on how to remotely manipulate actuators is also constantly being conducted. Various manipulation methods have been devised including the magnetic, optical, and acoustic control of microscale actuators, demonstrating the great potential for non-contact and non-invasive control. However, research related to the precise control of microscale actuators is still in the early stages, and in-depth research is needed for the efficient control and diversification of a range of applications. In the future, the combination of the fs laser-based fabrication technique for the precise fabrication of microscale actuators/robots and their manipulation can be established as a next-generation processing method by presenting the possibility of applications to various areas.

Acoustic control of suspended particles in micro fluidic chips

Lab on a Chip ◽  
2004 ◽  
Vol 4 (2) ◽  
pp. 131-135 ◽  
Author(s):  
Andreas Nilsson ◽  
Filip Petersson ◽  
Henrik Jönsson ◽  
Thomas Laurell
Keyword(s):  
Suspended Particles ◽  
Acoustic Control
Sign in / Sign up

Export Citation Format

Share Document