Study on the Analysis of Failure Cause and Determination of Life Test Mode of Capsule

2018 ◽  
Vol 18 (3) ◽  
pp. 260-270
Author(s):  
Bosik Kang ◽  
Yongbum Lee ◽  
Dongsoo Jung ◽  
Chungsung Lee
Keyword(s):  
Life Test ◽  
Test Mode

Synchronous Belt Materials and Belt Life Correlation

1994 ◽  
Vol 208 (1) ◽  
pp. 37-48 ◽  
Author(s):  
K W Dalgarno ◽  
A J Day ◽  
T H C Childs
Keyword(s):  
Material Properties ◽  
Failure Modes ◽  
Belt Drive ◽  
Tooth Root ◽  
Test Results ◽  
Life Test ◽  
Material Change ◽  
Tooth Stiffness ◽  
Limiting Parameters

This paper examines synchronous belt life through the determination of the life-limiting parameters within a belt drive. Six different belt constructions were life-tested, producing three failure modes: tooth root cracking, cord delamination and fabric separation. The life test results were then correlated to various tooth deflections within the belt run. The results of this examination were then used to draw conclusions about which material properties most influence the belt life. It is concluded that the tooth deflections at entry to and exit from the pulleys are most damaging, and that any material change which will increase the dynamic tooth stiffness will increase the belt life within the three failure modes encountered.

Development of Accelerated Life Test Method of Hydraulic Pump

2006 ◽  
Vol 326-328 ◽  
pp. 1861-1864
Author(s):  
Dong Soo Jung ◽  
Hyoung Eui Kim ◽  
Sung Hun Kim ◽  
E Sok Kang
Keyword(s):  
Duty Cycle ◽  
Weighted Average ◽  
Life Time ◽  
Test Method ◽  
Accelerated Life Test ◽  
Hydraulic Pump ◽  
Life Test ◽  
Accelerated Life ◽  
Equivalent Load

This paper proposes a new accelerated life test method of hydraulic pump used in vehicles, which have multiple alternating loads. For determination of life time of hydraulic pump for given field conditions with respect to duty cycle, the equivalent load and speed of this unit has to be determined. Equivalent load and speed can be calculated from the given duty cycle using the predominant theory for cumulative fatigue damage. Finally, we can perform accelerated life test on hydraulic pump by determination of test pressure and speed from calculated equivalent cumulative damage per working cycle and weighted average speed.

scholarly journals Shelf Life of Nori from Gracilaria sp. with Polypropylene (PP) Packaging Based on the Accelerated Shelf Life Test Method

2020 ◽  
pp. 50-60
Author(s):  
Sapinatun Namira ◽  
Evi Liviawaty ◽  
Isni Nurruhwati ◽  
Eddy Afrianto
Keyword(s):  
Shelf Life ◽  
Storage Temperature ◽  
Test Method ◽  
Critical Parameters ◽  
Life Test ◽  
Arrhenius Model ◽  
Texture Parameters ◽  
Calculation Results ◽  
Clear Plastic

This research was conducted at the Laboratory of Fisheries Products Processing, Faculty of Fisheries and Marine Sciences, Padjadjaran University, Jatinangor, West Java, Indonesia. The purpose of this research was to determine the shelf life of Nori from Gracilaria sp. with the Accelerated Shelf Life Test (ASLT) method Arrhenius Model using Polypropylene (PP) packaging. Gracilaria is a genus of red algae (Rhodophyta) used as a food for humans and various species of shellfish. Polypropylene (PP) is a shiny, clear plastic with good optical properties and tensile resistance. The determination of the shelf life of the ASLT method is carried out using parameters of environmental conditions that can accelerate the process of product quality degradation, namely by storing the product at several temperatures above normal storage temperature. The observations used in determining the shelf life of Gracilaria sp. using a sensory test and a water content test with storage for 35 days, at a temperature of 25°C and 35°C. The calculation results of the Arrhenius model used texture parameters as critical parameters because those had the lowest Activation Energy (Ea) in determining the shelf life of Gracilaria sp. which is packaged using PP plastic. The results showed the value used for determining the shelf life of nori Gracilaria sp. namely texture parameters based on the order 0 reaction with the Arrhenius plot Ln K = -2.0381 - 214.63 (1 / T) and Ea of 1784.6485. The shelf life of nori Gracilaria sp. was found to be elongated if stored at room temperature of (25°C) which was around 94 days.

scholarly journals SHELF LIFE OF NORI FROM Gracilaria sp. WITH ALUMUNIUM FOIL PACKAGING BASED ON THE ACCELERATED SHELF LIFE TEST METHOD

2021 ◽  
Vol 2 (1) ◽  
pp. 1-10
Author(s):  
Evi Liviawaty ◽  
Sapinatun Namira ◽  
Subiyanto Subiyanto ◽  
Eddy Afrianto
Keyword(s):  
Shelf Life ◽  
Critical Parameter ◽  
Storage Temperature ◽  
Arrhenius Plot ◽  
Aluminum Foil ◽  
Test Method ◽  
Life Test ◽  
Arrhenius Model ◽  
Quality Degradation

This research was conducted at the Laboratory of Fisheries Products Processing, Faculty of Fisheries and Marine Sciences, Padjadjaran University, Jatinangor. The purpose of this research is to determine the shelf life of Nori from Gracilaria sp. with the Accelerated Shelf Life Test (ASLT) method Arrhenius Model using Aluminum Foil packaging. Aluminum foil packaging is a package composed of hermetic, flexible, and opaque metal so that it has high protection properties against water vapor, light, grease and gas. The determination of the shelf life of the ASLT method is carried out using parameters of environmental conditions that can accelerate the process of product quality degradation, namely by storing the product at several temperatures above normal storage temperature. The observations used in determining the shelf life of Gracilaria sp. using a sensory test and a water content test with storage for 35 days, at a temperature of 25oC and 35oC. The result of the Arrhenius model calculation, the appearance parameter is selected as the critical parameter because it has the lowest Activation Energy (Ea) in determining the shelf life of Gracilaria sp. which is packaged using PE plastic. The results show that the parameters used to determine the shelf life of the product are the taste parameters based on the order 1 reaction with the Arrhenius Plot Ln K = 0.026 – 1318.4 (1 / T) and Ea of 2619.66 Kj/mol. The shelf life of Nori Gracilaria sp. if stored at 25oC temperature is 89 hari 7 jam.

A Study on the Determination of Accelerator Factor for the Accelerated Life Test of Hydraulic Winch

2019 ◽  
Vol 19 (4) ◽  
pp. 334-342
Author(s):  
Jongsik Choi ◽  
Gichun Lee ◽  
Yongbum Lee ◽  
Jongwon Park ◽  
Kyungha Ryu ◽  
...  
Keyword(s):  
Accelerated Life Test ◽  
Life Test ◽  
Accelerated Life

Design of a Zero-Failure Reliability Test Plan Based on Customer Usage and Bench Life Test Data

2006 ◽  
Vol 49 (2) ◽  
pp. 93-103
Author(s):  
Jianxiong Chen ◽  
Wenzhen Yan
Keyword(s):  
Monte Carlo Simulation ◽  
Test Data ◽  
New Products ◽  
Test Method ◽  
Reliability Test ◽  
Distribution Analysis ◽  
Test Plan ◽  
Life Test ◽  
Product Service

Reliability tests are mandatory to evaluate new products prior to their release. The proper determination of a reliability test plan is crucial because an erroneous test plan can be very costly and misleading. This paper describes a probability-based method of designing a reliability demonstration test plan using both field customer usage and historical bench life test data. Statistical distribution analysis, Monte Carlo simulation (MCS) technique, and zero-failure test method are integrated into the probability-based method to create test plans that can more accurately evaluate product reliabilities for the required product service life using a small number of test samples.

An Improved Weighted Average Method for Test Data Analysis of Electronic Components

2013 ◽  
Vol 321-324 ◽  
pp. 734-738
Author(s):  
Fei Fei Zhang ◽  
Zhi Gang Li ◽  
Fang Yao
Keyword(s):  
Test Data ◽  
Weighted Average ◽  
Electronic Components ◽  
Characteristic Parameters ◽  
Life Test ◽  
Electric System ◽  
Electromagnetic Relay ◽  
Random Fluctuations ◽  
Weight Coefficients

Electronic components are the basis of electronic equipment, and their reliability and lifetime have a direct impact on the work efficiency of the whole electric system. In fact, the test data on life characteristic parameters (LCP) of electronic components present random fluctuations because of the existence of some disturbing factors in the process of life test. This will bring great obstacles to the study on the rules of LCP, the reliability and life forecasting of electronic components. In order to solve these problems, this paper proposes a method of the determination of weight coefficients and an improved weighted average algorithm to reveal the rules of LCP. In the improved weighted average algorithm, the latest data is constantly introduced while the oldest data is removed. By an example of contact bounce time on electromagnetic relay, the application verification has been carried out on the above-stated method in the paper. The results show that the method is effective and feasible.

Innovative Temperature Accelerated Life Test for the determination of the activation energy of space solar cells

2019 ◽  
Author(s):  
Neftali Nunez ◽  
Manuel Vazquez ◽  
Laura Barrutia ◽  
Jesus Bautista ◽  
Ivan Lombardero ◽  
...  
Keyword(s):  
Activation Energy ◽  
Solar Cells ◽  
Accelerated Life Test ◽  
Life Test ◽  
Accelerated Life

scholarly journals Experimental accelerated shelf life determination of a ready-to-eat processed food

2019 ◽  
Vol 7 (4) ◽  
Author(s):  
M. Naceur Haouet ◽  
Mauro Tommasino ◽  
Maria Lucia Mercuri ◽  
Ferdinando Benedetti ◽  
Sara Di Bella ◽  
...  
Keyword(s):  
Activation Energy ◽  
Shelf Life ◽  
Food Products ◽  
Food Preparation ◽  
Processed Food ◽  
Life Test ◽  
Life Saving ◽  
Life Tests

The most direct way to estimate the shelf life of a product is to conduct simulation tests which are time consuming and expensive. Conversely, accelerated shelf life tests can be successfully used for stable products having long expected shelf life. The aim of the study was directed to verify the possibility to apply an accelerated shelf life test to perishable food products having a short-expected shelf life, such as a new ready-to-eat processed food preparation, composed mainly by cereals, tuna and chicken, packed in thermo-sealed trays and pasteurised. Different samples of the product were stored in thermal abuse conditions, collected periodically and subjected to determinations of TVB-N, pH and sensorial characteristics. Q10 and activation energy were calculated allowing to obtain a predictive evaluation of the product shelf life at the 4°C recommended temperature. The product shelf life was assessed at 26 days vs the 30 days expected by the manufacturer, showing the possibility to apply successfully ASLT for products having short shelf life, saving both time and money.

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