Stress Relieving Procedures for Helical Compression Springs

1974 ◽  
Author(s):  
Henry P. Swieskowski
Keyword(s):  
Stress Relieving ◽  
Compression Springs

THE EFFECT OF MECHANICAL VIBRATION ON STRESS RELIEVING OF WELDED JOINTS

2019 ◽  
Author(s):  
DANILO CESAR DE AZEVEDO MONTEIRO ◽  
Tatiane de Campos Chuvas ◽  
Maria Cindra Fonseca
Keyword(s):  
Welded Joints ◽  
Mechanical Vibration ◽  
Stress Relieving

Development and Validation of RP-HPLC Method for Vicenin-2, Orientin, Cynaroside, Betulinic Acid, Genistein, and Major 8 Bioactive Constituents with LC-ESI-MS/MS profiling in Ocimum genus

2021 ◽  
Author(s):  
Aboli Girme ◽  
Prajkta Bhoj ◽  
Ganesh Saste ◽  
Sandeep Pawar ◽  
Amit Mirgal ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Betulinic Acid ◽  
Gradient Elution ◽  
Carnosic Acid ◽  
Bioactive Constituents ◽  
Validation Data ◽  
Method Performance ◽  
Esi Ms ◽  
Stress Relieving ◽  
Quality Control Tool

Abstract Background Ocimum genus known as Tulsi or Basil is a prominent botanical class in Asian culture, especially in India. The leaves have an immunomodulatory, antioxidant, stress-relieving, and adaptogenic role in traditional and modern medicine, with prominent usage in herbal teas and nutraceuticals. Objective The HPLC-PDA method was developed and validated for vicenin-2, orientin, cynaroside, betulinic acid, genistein, with syringic acid, rosmarinic acid, eugenol, carnosic acid, oleanolic acid, ursolic acid, luteolin, apigenin for quantification and confirmed using a novel ESI -MS/MS method in the Ocimum samples. Method The methodology parameters were developed on the RP-C18 column with a gradient elution of 1 mL/min flow rate for 0.1% o-phosphoric acid and acetonitrile at 210 and 340 nm wavelengths. Result The validation data for 13 bioactive compounds showed good linearity (r2> 0.99) with sensitive LOD (0.034-0.684 µg/mL) and LOQ (0.100-2.068 µg/mL) with recoveries (83.66-101.53%).The results were found precise (RSD,<5.0%) and accurate (RE, -0.60-1.06) for the quantification. The method performance was verified and found robust by analyzing ten samples of O. tenuiflorum from the ten geographical states of India (RSD, < 5.0%). Conclusion The validated HPLC-PDA method was found selective and suitable for analyzing thirteen compounds in O. tenuiflorum and twelve cultivars from the Ocimum genus as a quality control tool. This method can be used in routine analysis as an inexpensive alternative to advanced techniques. Highlights This work is the first to report for vicenin-2, orientin, cynaroside, betulinic acid, and genistein, with simultaneous analysis of eight bioactive compounds in the Ocimum genus.

scholarly journals Evaluating Stress Relief from Architecture: A Case Study Based on Buildings in Taiwan, China and Japan

2021 ◽  
Vol 13 (14) ◽  
pp. 7899
Author(s):  
Ming-Chyuan Ho ◽  
Yung-Chia Chiu
Keyword(s):  
Urban Landscape ◽  
Stress Relief ◽  
Future Trend ◽  
Differential Method ◽  
City Image ◽  
Structured Interviews ◽  
Architectural Styles ◽  
Stress Relieving ◽  
Study Results ◽  
Image Identity

The urban landscape can be improved to reduce the stress experienced by citizens. Therefore, stress-relieving buildings constitute a crucial topic and a future trend in architecture and design. In this study, different architectural styles were investigated to explore design methods for and characteristics of stress-relieving building shapes and to identify indicators for measuring participant stress relief while viewing buildings. To understand stress relief from architecture, we performed semi-structured interviews with 60 participants who viewed images of 30 buildings. The semantic differential method with a 7-point image scale was used to rate stress relief from different architectural styles. The study results revealed that the participants perceived curvilinear buildings as interesting but do not relieve stress. The participants identified as feeling high pressure considering rectilinear patterns to relieve more stress. To support this observation, we identified three principles—city image, identity, and spiritual atmosphere—as fundamental loci of designing cities for livability. We illustrate the three principles with several cases that facilitate a detailed understanding of their applicability in biodesign practices.

Finite Element Analysis of Large-Size Yaw Bearings with Supporting Structure in Wind Turbine

2014 ◽  
Vol 672-674 ◽  
pp. 1550-1553
Author(s):  
Zhen Guo Shang ◽  
Zhong Chao Ma ◽  
Zhen Sheng Sun
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Point Contact ◽  
Element Model ◽  
Contact Forces ◽  
Element Analysis ◽  
Supporting Structure ◽  
Rolling Elements ◽  
Yaw Bearing ◽  
Compression Springs

A procedure for obtaining the load distribution in a four point contact wind turbine yaw bearing considering the effect of the structure’s elasticity is presented. The inhomogeneous stiffness of the supporting structures creates a variation in the results obtained with a rigid model. A finite element model substituting the rolling elements with nonlinear compression springs has been built to evaluate the effect of the supporting structure elasticity on the contact forces between the rolling elements and the raceways.

Foil Gas Bearing With Compression Springs: Analyses and Experiments

2007 ◽  
Vol 129 (3) ◽  
pp. 628-639 ◽  
Author(s):  
Ju-ho Song ◽  
Daejong Kim
Keyword(s):  
Loss Factor ◽  
Load Capacity ◽  
Underlying Structure ◽  
Equivalent Viscous Damping ◽  
Foil Bearings ◽  
Foil Bearing ◽  
Different Types ◽  
Structural Loss ◽  
Compression Springs ◽  
Gas Bearing

A new foil gas bearing with spring bumps was constructed, analyzed, and tested. The new foil gas bearing uses a series of compression springs as compliant underlying structures instead of corrugated bump foils. Experiments on the stiffness of the spring bumps show an excellent agreement with an analytical model developed for the spring bumps. Load capacity, structural stiffness, and equivalent viscous damping (and structural loss factor) were measured to demonstrate the feasibility of the new foil bearing. Orbit and coast-down simulations using the calculated stiffness and measured structural loss factor indicate that the damping of underlying structure can suppress the maximum peak at the critical speed very effectively but not the onset of hydrodynamic rotor-bearing instability. However, the damping plays an important role in suppressing the subsynchronous vibrations under limit cycles. The observation is believed to be true with any air foil bearings with different types of elastic foundations.

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