An experimental study of a hydrogen-enriched ethanol fueled Wankel rotary engine at ultra lean and full load conditions

Most of the shipped products are sensitive against shock and vibration events during the distribution. Various cushioning materials are usually used to prevent the product damages. During the design process the protective packaging system is developed by the engineers based on the cushion and vibration transmissibility features (ie. cushion curve) of the material used. However, after the assembly of the packaged-product, these are stored for various long periods in warehouse. During this time the products pre-load the cushioning material and its parameters can be changed. The main goal of this study is to evaluate the vibration transmissibility of PE and XPE cushioning material at varied storage (pre-loaded) time and static load conditions. Four different kinds of duration (1 hour, 10 hours, 100 hours and 1000 hours) were used for the pre-loading period at three different static loads (3.488 kPa, 4.651 kPa, and 6.976 kPa), and then at 0.5 oct/min sine sweep vibration the peak frequencies of response and vibration transmissibility, and damping ratio were determined. The results show that the effect of pre-loading is minimal by PE material, but can influence the resonance frequencies by XPE cushioning material. The findings of this study help the packaging engineers to understand better the mechanism of these cushioning materials and to design suitable protective packaging systems.

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The Study of the Flexural Capacity of Old and New Prestressed Concrete Hollow Slab Strengthened with CFRP

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.482.66 ◽

2013 ◽

Vol 482 ◽

pp. 66-69

Author(s):

Bin Jia ◽

Lei Fu ◽

Yu Zhang ◽

Yi Lu

Keyword(s):

Experimental Study ◽

Carbon Fiber ◽

Engineering Design ◽

Prestressed Concrete ◽

Reinforcement Effect ◽

Flexural Capacity ◽

Design Specifications ◽

Secondary Load ◽

Contrast Analysis ◽

Load Conditions

Prestressed hollow slab strengthened with CFRP is a new reinforcement method. To study the effect on reinforcement through different carbon fiber paste volume and paste manner, we did the experimental study on flexural capacity under the secondary load conditions with prestressed concrete hollow slab commonly used in engineering. Meanwhile, we also did the contrast analysis of reinforcement effect on the old and new prestressed concrete hollow slab. The results showed that prestressed concrete hollow slab strengthened with CFRP could effectively improve the flexural capacity of the specimen, besides the capacity increasing of the old and new prestressed hollow slab is a little difference, but both of the new and old can meet the engineering design specifications.

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Experimental Study on Fault Caused by Partial Arc Steam Forces and Its Economic Solution

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4000090 ◽

2010 ◽

Vol 132 (6) ◽

Cited By ~ 5

Author(s):

Daren Yu ◽

Yanfeng Duan ◽

Jinfu Liu ◽

Zhansheng Liu ◽

Qinghua Hu

Keyword(s):

Experimental Study ◽

Temperature Rise ◽

Mechanism Analysis ◽

Steam Turbines ◽

Practical Test ◽

Full Load ◽

Control Stage ◽

Fault Mechanism ◽

Fault Characteristic

It is noticed in a few steam turbines that there are a pad temperature rise of more than 10°C and a radial journal movement of more than 50 μm in the bearings adjacent to control stage when they operate under partial arc admission at 60–80% of their full load. It is found through fault mechanism analysis and experimental study that the fault is caused by partial arc steam forces acting on control stage. A fault characteristic is concluded to help identify this fault. Diagonal admission is therefore proposed as an economic solution for elimination of this fault and it is proved to be effective through practical test.

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Maneuverability of a pusher and barge system under empty and full load conditions

Journal of Marine Science and Technology ◽

10.1007/s00773-017-0485-3 ◽

2017 ◽

Vol 23 (3) ◽

pp. 464-482

Author(s):

Masaaki Sano ◽

Hironori Yasukawa ◽

Akio Okuda ◽

Tomohiro Hamaguchi

Keyword(s):

Full Load ◽

Load Conditions

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Oil Ring Design Influence on Lube Oil Consumption of SI Engines

ASME 2004 Internal Combustion Engine Division Fall Technical Conference ◽

10.1115/icef2004-0868 ◽

2004 ◽

Cited By ~ 3

Author(s):

Andre´ Ferrarese ◽

Fernando F. Rovai

Keyword(s):

Thermal Stability ◽

The Other ◽

Oil Consumption ◽

Ring Type ◽

Full Load ◽

Sealing Capacity ◽

Other Hand ◽

Actual Use ◽

Si Engines ◽

Load Conditions

2-piece and 3-piece oil ring designs were tested in dynamometer and vehicles in order to evaluate the ring type influence on lube oil consumption of spark ignited (SI) engines. The dynamometer tests were executed according a typical durability cycle of SI engines. This cycle is predominantly in full load conditions. Under these conditions, 2-piece oil ring design showed lower lube oil consumption than 3-piece. Two different vehicle tests were also run: urban and mountain circuits. The purpose of the urban circuit test was to simulate the actual use of the engine. The mountain circuit was selected to verify the rings behavior under motoring conditions. In vehicle tests, 3-piece showed lower or equivalent oil consumption than 2 piece, which disagreed with the dynamometer tests. This difference can be explained by the better side sealing capacity of the 3-piece oil ring. On the other hand, 2-piece oil rings present better conformability, important for applications with larger bore distortion. So, the most appropriate application of oil ring type depends on the load and speed conditions, in which the engine would predominantly operate. Ring wear and thermal stability are compared using bench and vehicle tests.

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