Research on Efficient Installation Method of Device of Lintel Beam Type

2014 ◽  
Vol 4 (2) ◽  
pp. 21-29
Author(s):  
Min-Joo Jo ◽  
Jong-Sung Kim
Keyword(s):  
Beam Type

scholarly journals Experimental study on the factors affecting torque of beam-type implant torque wrenches

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hiroki Shiba ◽  
Yuji Sato ◽  
Junichi Furuya ◽  
Tokiko Osawa ◽  
Akio Isobe ◽  
...  
Keyword(s):  
Coefficient Of Variation ◽  
Leading Edge ◽  
Beam Width ◽  
Factors Affecting ◽  
Tightening Force ◽  
Torque Wrench ◽  
Screw Breakage ◽  
Beam Type ◽  
Accuracy And Repeatability ◽  
Excellent Accuracy

Abstract Background Screw breakage and loosening are the most common mechanical complications associated with implant treatment, and they may occur due to excess or inadequate screw tightening torque. When fastening and fixing the implant superstructure, screws are tightened using a torque wrench, which is essential for an accurate tightening force. However, the characteristics of the torque wrench have not been fully verified. Therefore, we aimed to clarify the factors affecting the torque with a focus on beam-type torque wrenches, which are the main types of wrenches. Methods The torque values generated by beam-type torque wrenches from eight manufacturers were measured using a torque gauge. To investigate the influence of the location of the beam relative to the scale, measurements were performed with a scale aligned with the trailing edge, center, and leading edge of the beam respectively. Additionally, measurements were taken at 90°, 60°, and 30° to examine the effect of the angle at which the examiner read the torque value. Under each condition, a single examiner applied the recommended torque to each manufacturer's screws five times in a clockwise direction. The average measured torque, standard deviation, bias, and coefficient of variation were calculated and compared accordingly. Results Wrenches from six manufacturers demonstrated excellent accuracy for measurements at the center of the beam (bias within ± 4%). For measurements at 90°, equipments from five manufacturers displayed excellent accuracy (bias within ± 7%), and seven showed excellent repeatability (coefficient of variation ≤ 2%). Conclusion The scale should be aligned with the center of the beam and read from 90° while using a torque wrench. The accuracy and repeatability torques generated by the wrenches differed according to the manufacturer, scale width, scale line width, beam width, and distance between the scale and beam center. Based on these results, we suggest that a torque wrench must be selected after determining the difference in the structure of the torque wrench.

scholarly journals Verification of large beam-type space structures

1987 ◽  
Vol 24 (5) ◽  
pp. 469-473 ◽  
Author(s):  
Choon-Foo Shih
Keyword(s):  
Space Structures ◽  
Type Space ◽  
Beam Type

Concrete Reservoirs of the Vertical-Beam Type

1944 ◽  
Vol 109 (1) ◽  
pp. 567-576
Author(s):  
C. Maxwell Stanley
Keyword(s):  
Vertical Beam ◽  
Beam Type

Simple Model of Forward Visibility for Snowplow Operators Through Snow and Fog at Night

1997 ◽  
Vol 1585 (1) ◽  
pp. 19-24 ◽  
Author(s):  
John Bullough ◽  
Mark S. Rea
Keyword(s):  
New York ◽  
New York State ◽  
Field Tests ◽  
Line Of Sight ◽  
York State Department ◽  
Light Sources ◽  
Department Of Transportation ◽  
Narrow Beam ◽  
York State ◽  
Beam Type

Backscattered light reflected from falling snow, rain, and fog impairs visibility and can hinder performance of snowplow operators. New York State Department of Transportation snowplow operators cite backscattered glare as an important problem, and many drivers use their own “solutions” to counteract it. A literature review yielded two important conclusions: backscattered light from a lamp in fog and falling snow is reduced, and visibility is improved ( a) as the lamp is moved away from the operator’s line of sight and ( b) with a narrow-beam lamp. Field tests of lighting configurations during inclement weather were conducted to determine the effects of beam type and displacement from the operator’s line of sight on visibility, glare, and satisfaction. On the basis of these data and the literature, a simple mathematical model was developed that predicts the forward-visibility ratings of snowplow operators. This model can be used to guide specifiers in selecting light sources and mounting locations for snowplow operations.

Active Performance Optimization of Cantilever Piezoelectric Energy Harvester

2014 ◽  
Author(s):  
M. Tavakkoli Anbarani ◽  
A. Alasty
Keyword(s):  
Resonance Frequency ◽  
Active Control ◽  
Piezoelectric Actuator ◽  
Performance Optimization ◽  
Energy Harvester ◽  
Distributed Parameter ◽  
Piezoelectric Energy ◽  
Significant Performance ◽  
Beam Type ◽  
Working Frequency

A Piezoelectric Energy Harvester (PEH) of cantilever beam type is developed to optimize the generated power by means of active control of moment of inertia of the beam. Distributed parameter equations of vibration of the beam are developed. Then the electromechanical response of the piezoelectric actuator is discussed. The harvester configuration is then described and it is shown that such a configuration can avoid the drastic power drop in presence of uncertainty around resonance frequency by applying voltage to the piezoelectric actuator. Finally the proposed harvester output power working frequency span is compared to conventional methods to show that the significant performance optimization in proposed method is achieved.

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