Investigation on Reliability Design of Ice-maker System Subjected to Repetitive Loading | Chapter 7| Recent Developments in Engineering Research Vol. 9

To increase the life of the ice-maker device with a broken helix upper dispenser in the field, parametric accelerated life testing (ALT) was used. A number of mechanical loads in the assembly were analysed using bond graphs and state equations. A generalised life-stress failure model with a new load definition was used to derive the acceleration factor. A new sample size equation was derived to replicate the failure modes and mechanisms causing the fracture. The sample size equation with the acceleration factor also allowed early field failure to be easily replicated by parametric accelerated life testing. Consequently, the modes and mechanisms of failure found were Having analysed. A generalised life-stress failure model with a new load definition was used to derive the acceleration factor. A new sample size equation was derived to replicate the failure modes and mechanisms causing the fracture. The sample size equation with the acceleration factor also allowed early field failure to be easily replicated by parametric accelerated life testing. The failure modes and mechanisms observed were therefore similar to those of the failed study. The design of this test should allow an engineer to discover the design parameters that affect the reliability of the field-based fractured helix upper dispenser. By deleting the layout The B1 life of the redesign of the helix upper dispenser is now guaranteed to be longer than 10 years with an annual failure rate of 0.1 percent, which is the reliability of the quantitative test specifications (RQ). Other mechanical systems, including automotive gear trains and motors, building machinery, forklifts, washing machines, vacuum cleaners and motor fan systems, may apply the latest reliability design methodology. For reliability design, we suggest that the missing or incorrect controllable design parameters on these systems be examined. Failure analysis, load analysis, and a targeted series of accelerated life tests may be part of these parameter studies.

Author (s) Details

Seong-Woo Woo
Faculty of Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia.

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Study on Improving the Reliability of a Domestic Refrigerator Compressor Subjected to Repetitive Loading| Chapter 6| Recent Developments in Engineering Research Vol. 9

The Parametric Accelerated Life Test (ALT) was used to determine the life of a commercial refrigerator's newly built compressor subjected to repeated pressure loading. It consists of (1) a product BX lifetime parametric ALT plan that will be X percent of the cumulative loss, (2) ALT load analysis, (3) a tailored sequence of parametric ALTs with design adjustments, and (4) determining if the product design(s) achieves the target BX lifetime. A generalised life-stress failure model and a new sample size equation with a new load definition were derived based on the basic refrigeration cycle. Using the equation of the sample size with the acceleration factor also allowed The design of this test can allow an engineer to uncover the design parameters that affect reliability during the compressor system design process. As a result, businesses should help boost product life and prevent recalls due to product defects in the field. A newly-designed compressor was used as a test case in a commercial refrigerator. Finally, to define and correct the design issues of a mechanical device, engineers may use parametric ALT.

Author (s) Details

Seong-Woo Woo
Faculty of Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia.

Dennis L. O’Neal
School of Engineering and Computer Science, Baylor University, Waco, Texas, USA.

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