Exact 2D piezoelasticity solution of hybrid beam with damping under harmonic electromechanical load

2004 ◽  
Vol 84 (6) ◽  
pp. 391-402 ◽  
Author(s):  
S. Kapuria ◽  
P.C. Dumir ◽  
A. Ahmed
Keyword(s):  
Hybrid Beam ◽  
Electromechanical Load

scholarly journals Innovative concepts for the usage of veneer-based hybrid materials in vehicle structures

2021 ◽  
pp. 146442072199839
Author(s):  
DB Heyner ◽  
G Piazza ◽  
E Beeh ◽  
G Seidel ◽  
HE Friedrich ◽  
...  
Keyword(s):  
Steel Strip ◽  
High Energy ◽  
The Body ◽  
Vehicle Body ◽  
Material System ◽  
Laminated Veneer Lumber ◽  
Hybrid Beam ◽  
Bending Load ◽  
The Impact ◽  
Very High

A promising approach for the development of sustainable and resource-saving alternatives to conventional material solutions in vehicle structures is the use of renewable raw materials. One group of materials that has particular potential for this application is wood. The specific material properties of wood in the longitudinal fiber direction are comparable to typical construction materials such as steel or aluminum. Due to its comparatively low density, there is a very high lightweight construction potential especially for bending load cases. Structural components of the vehicle body are exposed to very high mechanical loads in the case of crash impact. Depending on the component under consideration, energy has to be absorbed and the structural integrity of the body has to be ensured in order to protect the occupants. The use of natural materials such as wood poses particular challenges for such applications. The material characteristics of wood are dispersed, and depend on environmental factors such as humidity. The aim of the following considerations was to develop a material system to ensure the functional reliability of the component. The test boundary conditions for validation also play a key role in this context. The potential of wood–steel hybrid design based on laminated veneer lumber and steel was investigated for use in a component subjected to crash loads such as the door impact beam. The chosen solution involves a separation of functions. A laminated veneer lumber-based beam was hybridized with a steel strip on the tension side. The steel strip was designed to compensate the comparatively low elongation at fracture of the wood and to ensure the integrity of the beam. The wooden component was designed for high energy absorption due to delamination and controlled failure during the impact, while maintaining the surface moment of inertia, i.e. the bending stiffness of the entire component. This approach was chosen to ensure the functional safety of the component, avoid sudden component failure and utilize the high potential of both materials. The tests carried out provided initial functional proof of the chosen solution. The hybridization achieved significantly higher deformations without sudden failure of the beam. In addition, bending capabilities were increased significantly compared to a beam without hybridization. In comparison with a state-of-the-art steel beam, the hybrid beam was not able to achieve the maximum deformation and the target weight of the hybrid beam. Further optimization of the hybrid beam is therefore necessary.

Hybrid Beam Steerable Phased Array Antenna for SATCOM OTM

2019 ◽  
pp. 75-86
Author(s):  
V. Devika ◽  
K. Sarat Kumar ◽  
K. Ch. SriKavya ◽  
Akhil ◽  
Pragnya
Keyword(s):  
Phased Array ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Hybrid Beam

scholarly journals Research on 5G-Oriented Wireless Sensor Array of Millimeter Hybrid Beam Sensing Terminal

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shengli Yan
Keyword(s):  
Channel Estimation ◽  
Millimeter Wave ◽  
Rapid Development ◽  
Mobile Internet ◽  
Projection Algorithm ◽  
Wireless Sensor ◽  
Digital Beamforming ◽  
Hybrid Beam ◽  
Hybrid Beamforming ◽  
Internet Of Things Technology

With the rapid development of information technology, facing the problems and new challenges brought by mobile Internet and Internet of things technology, as one of the key technologies of 5G, millimeter-wave mobile communication (28/38/60/70 GHz) which can realize gigabit (GB/s, or even higher) data transmission rate has also attracted extensive attention of wireless researchers all over the world, it has quickly become a research hotspot in the field of wireless communication. In the millimeter-wave massive MIMO downlink wireless sensor system, a block diagonal beamforming algorithm based on the approximate inverse of Neumann series is improved to obtain complete digital beamforming. Then, when designing hybrid beamforming, channel estimation and high-dimensional singular value decomposition are required for traditional analog and digital hybrid beamforming. A low complexity hybrid beamforming scheme is designed. An improved gradient projection algorithm is proposed in the design of analog beamforming, which can solve the problem of high computational complexity and less damage to guarantee and rate. Simulation results show that the hybrid beam terminal of the sensor reduces the number of RF links required for full digital beamforming and is as close to the spectral efficiency performance of full digital beamforming as possible. The results show that the performance of the designed hybrid beamforming scheme can still be close to that of the pure digital beamforming scheme without involving channel estimation and SVD decomposition.

ERROR ANALYSIS OF A HYBRID BEAM ELEMENT WITH TIMOSHENKO STIFFNESS AND CLASSICAL MASS

2004 ◽  
Vol 05 (03) ◽  
pp. 495-508 ◽  
Author(s):  
P. JAFARALI ◽  
LALITHA CHATTOPADHYAY ◽  
G. PRATHAP ◽  
S. RAJENDRAN
Keyword(s):  
Error Analysis ◽  
Beam Element ◽  
Hybrid Beam

Energy absorption characteristics of aluminium/CFRP hybrid beam under impact loading

2016 ◽  
Vol 22 (2) ◽  
pp. 190-201 ◽  
Author(s):  
Sang-Young Kim ◽  
Ju-Won Jeong ◽  
Jun-Yeob Kim ◽  
Hee-Chul Kim ◽  
Dong-Kil Shin ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Impact Loading ◽  
Hybrid Beam ◽  
Absorption Characteristics
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