scholarly journals The Effect of Vibration Impact from Piling Works to the Surrounding Buildings

2021 ◽  
Vol 9 (5A) ◽  
pp. 101-107
Author(s):  
Nurulzatushima Abdul Karim ◽  
Adhilla Ainun Musir ◽  
Mohd Samsudin Abdul Hamid ◽  
Siti Hafizan Hassan ◽  
Ahmad Ihsan Qistan Kamarulzaman ◽  
...  
Keyword(s):  
Vibration Impact

Choosing Damping Parameters for the Inertial Orientation System

2021 ◽  
pp. 113-128
Author(s):  
V.P. Podchezertsev ◽  
S.V. Topilskaya
Keyword(s):  
Natural Frequency ◽  
Vibration Suppression ◽  
Outer Space ◽  
Protection System ◽  
Dynamic Vibration ◽  
Shock Absorbers ◽  
Vibration Protection ◽  
Orientation System ◽  
Vibration Impact ◽  
Vibration Dampers

The article discusses criteria for selecting the vibration protection for the spacecraft inertial orientation system. The considered vibration protection system allows providing acceptable amplitude acceleration for the gyroscopic device sensitive elements under vibration impact on the device body during the spacecraft launching and high angular stability of the position of the sensitive elements relative to the inertial coordinate system during a long period of operation (15 years) in orbit. The proposed vibration protection system consists of shock absorbers (springs) with stable high elastic characteristics under all factors of operation in the outer space and dynamic vibration dampers. The article presents a method for determining the parameters of dynamic vibration dampers taking into account the characteristics of the shock absorber, critical for the damping system of an inertial device. The proposed method for adjusting dynamic vibration dampers consists in suppressing vibrations at the natural frequency f1 of the shock absorption system and providing acceptable values of the gain coefficients of the structure resonant vibration amplitudes near the natural frequency f1. Certain characteristics of the damping system allow realizing the permissible vibration amplification coefficients at resonance, without significantly affecting the level of vibration suppression in the natural frequency zone of the vibration protection object

Development of vibration system for decreasing of intensity of steel ladle outlet channel tightening

2021 ◽  
Vol 77 (2) ◽  
pp. 165-174
Author(s):  
S. P. Eron’ko ◽  
E. A. Ponamareva ◽  
E. S. Tsykhmistro
Keyword(s):  
Machine Building ◽  
Flow Section ◽  
Steel Ladle ◽  
General View ◽  
Technical Solution ◽  
Test Model ◽  
Outlet Channel ◽  
Hard Particles ◽  
Oscillation Process ◽  
Vibration Impact

The problem of tightening of outlet channel of steel ladle still remains relevant at present. A review of scientific and technical studies, aimed at elaboration of methods to keep the channel flow section constant presented. An analysis of deposition forming mechanisms on walls of outlet channel of steel ladle was done. To prevent their formation it was proposed to apply a vibration impact on the ladle shutter. Using simulation studies and specially elaborated methodology, the degree of influence and frequency of amplitude oscillations, acting along the ladle channel, on increasing speed of layer thickness formation on its walls and number of tearing off hard particles was established. To evaluate intensity of elastic waves absorption by the refractories of ladle shutter during vibration impact on it, a natural experiment was done. As a result of the experiment an initial information was obtained for determining parameters of oscillation process to guarantee effective functioning of the proposed casting facility. A necessity was established to account tenfold decrease of vibration acceleration during propagation of elastic wave along the casting channel from the lower end of collector nuzzle to the upper end of the ladle casting nozzle. Results of the complex studies became base of technical solution at elaboration of design of the ladle shutter. The elaborated shutter is equipped by a system of exciting vertically-directed oscillations, promoting decreasing intensity of hard particles sticking on the walls of the outlet channel. The design of the perfected ladle shutter and general view of its test model shown, which is equipped with the vertically-directed oscillations exciting system. Depending on capacity of the steel ladles, which can be from 100 to 300 t, their shutters can be equipped with one or several pneumatic plunger vibrators. Each of the plunger having the mass of 0.8 kg, can develop an impact force up to 300 N when supplying into its working cavity compressed air of 0.2 MPa pressure at flow rate 150 l/min. Industrial tests of the modernized shutter in a foundry shop of Yasinovatsky machine-building plant were done.

scholarly journals Investigating the Pre-Damaged PZT Sensors under Impact Traction

2018 ◽  
Vol 6 (4) ◽  
pp. 142 ◽  
Author(s):  
Sakineh Fotouhi ◽  
Mohamad Fotouhi ◽  
Ana Pavlovic ◽  
Nenad Djordjevic
Keyword(s):  
Sandwich Panel ◽  
Piezoelectric Sensors ◽  
Dynamic Loads ◽  
Impact Loads ◽  
Elastic Plates ◽  
Factors Affecting ◽  
Reliable Performance ◽  
Vibration Impact ◽  
Static And Dynamic Loads ◽  
Marine Applications

Ships are usually under vibration, impact, and other kinds of static and dynamic loads. These loads arise from water flow across the hull or surfaces, the propeller cavitation, and so on. For optimal design purposes and reliable performance, experimental measurements are necessary. These sensors are often used under or near the water, working conditions that improve the risk of sensor damage. This paper aims at investigating, by the use of finite elements, the behavior of damaged piezoelectric sensors under traction and impact loads. The numerical method was calibrated using results available in the literature regarding piezoelectric and elastic plates with a central crack. After calibration, the simulation was used on two types of Lead-Zirconium-Titanium oxide (PZT) sandwich panel structures reinforced by aluminum skins. The results proved that the damage size and impact energy are important factors affecting the response of piezoelectric sensors; therefore, special attention might be considered when using these sensors for marine applications.

Optimal design of vibration impact systems

1989 ◽  
Vol 11 (3) ◽  
pp. 235-238
Author(s):  
Vytautas Ostashevitchus ◽  
Rimvydas Gaidys
Keyword(s):  
Optimal Design ◽  
Vibration Impact

scholarly journals Novel elastico-mechanoluminescence materials CaZnOS:Mn2+ and CaZr(PO4)2:Eu2+

2014 ◽  
Vol 04 (03) ◽  
pp. 1430003 ◽  
Author(s):  
Jun-Cheng Zhang ◽  
Chao-Nan Xu ◽  
Xusheng Wang ◽  
Yun-Ze Long
Keyword(s):  
Mechanical Stress ◽  
Ultrasonic Vibration ◽  
Dynamic Load ◽  
Recent Progress ◽  
Piezoelectric Coefficient ◽  
Measurement Range ◽  
Trapping Model ◽  
Vibration Impact ◽  
Trap Levels

This paper highlights our work on the recent progress in novel elastico-mechanoluminescence (EML) materials CaZnOS : Mn 2+ and CaZr ( PO 4)2: Eu 2+, which can simultaneously "feel" (sense) and "see" (image) the applied mechanical stress as an intense and proportional luminescence. CaZnOS : Mn 2+ can sense various types of mechanical stress, including ultrasonic vibration, impact, friction and compression because of the large piezoelectric coefficient. CaZr ( PO 4)2: Eu 2+ with multiple trap levels shows a broad measurement range for dynamic load. Both of CaZnOS : Mn 2+ and CaZr ( PO 4)2: Eu 2+ belong to the defect-controlled type piezoelectric phosphors, and their EML mechanisms could be explained using the piezoelectrically induced carrier de-trapping model.

An integrated principle solution synthesis method in multi-disciplinary mechatronic product conceptual design

2018 ◽  
Vol 26 (4) ◽  
pp. 341-354 ◽  
Author(s):  
Jin Qi ◽  
Jie Hu ◽  
Ying-Hong Peng
Keyword(s):  
Conceptual Design ◽  
Synthesis Method ◽  
Design Solution ◽  
Universal Method ◽  
Solution Synthesis ◽  
Combinatorial Principle ◽  
Principle Solution ◽  
Vibration Impact ◽  
Design Conflicts

Synthesizing suitable principle solutions together to form the design solution is a universal method in conceptual design. For the modern mechatronic product, the conceptual design is often multi-disciplinary, which would be extremely time consuming and labour-intensive for designers to synthesize multi-disciplinary principle solutions together. Taking advantage of functional knowledge and structural knowledge of principle solution, this article proposes an integrated principle solution synthesis method which not only achieves the automated synthesis of multi-disciplinary principle solutions but also solves the undesired physical conflicts among principle solutions to be synthesized. In integrated principle solution synthesis, a synthesis agent is developed to chain the functional flows of principle solutions to form the combinatorial principle solution set, and synthesis agent selects the combinatorial principle solution with highest availability value as the recommended combinatorial principle solution. Then extensic theory is employed to deal with the partial design conflicts hidden in recommended combinatorial principle solution by extending and transforming the conflict functional structures. A case study on the emergency cutting off device design is given to prove the industrial applicability of integrated principle solution synthesis, which indicates that compared with traditional synthesis method, integrated principle solution synthesis can not only get multi-disciplinary design result of emergency cutting off device but also further resolve the design conflict (i.e. vibration impact) to optimize the functional structure of emergency cutting off device.

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