Failure analysis and redesign of a helix upper dispenser

Woo, Seongwoo; Pecht, Michael

doi:10.1016/j.engfailanal.2007.10.005

Cited by 28 publications

(9 citation statements)

References 3 publications

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“…Inspection of the failed product, load analysis, and two rounds of parameter ALTs showed that the product reliability -the newly designed residential refrigerator was greatly improved. Another case study of this new reliability testing methodology [11]- [20], will be recommended.…”

Section: Discussionmentioning

confidence: 99%

Improving Reliability of Product Subjected to Random Vibration During Transportation

Woo¹

2017

WIT Transactions on the Built Environment

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To enhance the reliability of newly designed product like refrigerator subjected to random vibrations in transportation, new reliability methodology, including load analysis and parametric Accelerated Life Testing (ALT), was presented. As a case study, refrigerator subjected to random vibration during transportation is studied to improve reliability. In first parametric ALT, the reliability of refrigerators was targeted to have B1 life in transportation. We found to be the damage of the compressor rubber mounts and the fractured connecting tubes between the compressor and condenser. The shape of failures in 1 st ALT and the failed samples in field are the same. The failures of connecting tube were caused by the design flaws of the compressor rubber mount. To correct these problems, the rubber mounts and the connecting tube were reshaped to protect the refrigerator from random vibration. Because there were no problems in 2 nd ALT, we knew that parametric ALTs were effective and the refrigerator was guaranteed to have B1 life in transportation.

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Section: Discussionmentioning

confidence: 99%

Improving Reliability of Product Subjected to Random Vibration During Transportation

Woo¹

2017

WIT Transactions on the Built Environment

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“…It will benefit to confirm the final design of new product. Another case study of this new reliability testing methodology [10][11][12][13][14][15][16][17][18][19][20][21][22][23] will be suggested.…”

Section: Introductionmentioning

confidence: 99%

Reliability Design of Mechanical System‐Like Water‐Dispensing System in Refrigerator Subjected to Repetitive Impact Loading

Woo¹

2017

System Reliability

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Based on field data and parametric accelerated life tests (ALT), the mechanical systemlike water-dispensing system in a bottom-mounted freezer (BMF) was redesigned to find out the missing design parameter in the design phase. To carry out parametric ALTs using a force/momentum balance, the simple mechanical loads of the water-dispensing system were analyzed. At the first ALT, the hinge and front corner of dispenser lever were fractured. The failure shapes found experimentally were similar to those of the failed samples in field. Dispenser lever in water-dispensing system was modified as having its fillets and ribs. At the second ALT, the modified dispenser lever also was fractured because of not having enough strength for impact loading at its front corner. The missing design parameters of the dispenser lever were not enough to have corner fillet rounding and rib thickness. After parameter ALTs with corrective action plans, reliability of the newly designed water-dispensing system is assured to have B1 life 10 years with a failure rate of 0.1%/year.

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“…In this study we present a new parametric Accelerated Life Testing (ALT) method that can improve the reliability of fractured helix upper dispenser in field. This new accelerated testing methodology [9]- [22] takes into account the fact that the ice-maker system with missing or improper design parameters can result in recalls and loss of brand name value. Based on the failure analysis of a fractured helix upper dispenser, we demonstrate the validity of our new reliability design method.…”

Section: Introductionmentioning

confidence: 99%

Reliability Design of Ice-Maker System Subjected to Repetitive Loading

Woo¹

2016

ENG

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Parametric Accelerated Life Testing (ALT) was used to improve the reliability of icemaker system with a fractured helix upper dispenser in field. By using bond graphs and state equations, a variety of mechanical loads in the assembly were analyzed. The acceleration factor was derived from a generalized life-stress failure model with a new load concept. To reproduce the failure modes and mechanisms causing the fracture, new sample size equation was derived. The sample size equation with the acceleration factor also enabled the parametric accelerated life testing to quickly reproduce early failure in field. Consequently, the failure modes and mechanisms found were identical with those of the failed sample. The design of this testing should help an engineer uncover the design parameters affecting the reliability of fractured helix upper dispenser in field. By eliminating the design flaws, gaps and weldline, the B1 life of the redesign of helix upper dispenser is now guaranteed to be over 10 years with a yearly failure rate of 0.1% that is the reliability quantitative test specifications (RQ).

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Failure analysis and redesign of a helix upper dispenser

Cited by 28 publications

References 3 publications

Improving Reliability of Product Subjected to Random Vibration During Transportation

Improving Reliability of Product Subjected to Random Vibration During Transportation

Reliability Design of Mechanical System‐Like Water‐Dispensing System in Refrigerator Subjected to Repetitive Impact Loading

Reliability Design of Ice-Maker System Subjected to Repetitive Loading

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