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Mean Time Between Failures Analysis

�ۿ۴�ý — Mon, 01 Apr 2013 09:07:42 +0000

MTBF is an abbreviation for Mean Time between Failures . MTBF is a measure of how reliable a product is. MTBF is usually given in units of hours, the higher the MTBF, the more reliable the product is.For electronic products, it is commonly assumed that during the useful operating life period the parts have constant failure rates, and part failure rates follow an exponential law of distribution. In this case, the MTBF of the product can be calculated as:

MTBF = 1/(sum of all the part failure rates)

and the probability that the product will work for some time T without failure is given by:

R(T) = exp(-T/MTBF)

Thus, for a product with an MTBF of 250,000 hours, and an operating time of interest of 5 years of 24×7 (43,800 hours):

R = exp(-43800/250000) = 0.839289

which says that there is an 83.9% probability that the product will operate for the 5 years without a failure, or that 83.9% of the units in the field will still be working at the 5 year point. Note: the Reliability calculation assumes replacement upon failure.

The MTBF figure for a product can be derived in various ways:

1) Lab test data

2) Actual field failure data

3) Prediction models (such as Telcordia SR-332 or MIL-HDBK-217).

Telcordia SR-332

Telcordia SR-332 was originally the Bell Laboratories Bell core standard for the reliability prediction of commercial electronic components.

The Telcordia Standard allows reliability predictions to be performed using three methods:

Method I provides predictions based on a Parts Count procedure.

Method II provides predictions based on combining laboratory test data with Parts Count data.

Method III provides predictions based on combining field tracking data with Parts Count data.

All three methods are handled by the Reliability Workbench Prediction Module

MIL-HDBK-217

MIL-HDBK-217 is a US Department of Defense standard for the reliability prediction of electronic components.

MIL-HDBK-217 provides two reliability prediction methods:

The Parts Count Method. This is a simpler approach for use during the early design phase and requires less information to be entered, for example quality, quantity and environment.
The Part Stress Method. This is more complex and requires detailed information on temperature conditions and electrical stress. The part stress method is used when the actual hardware and circuits are being designed.

�ۿ۴�ý has years of experience in component engineering and has capability to provide MTBF analysis for products and Bill of materials. �ۿ۴�ý’s MTBF analysis will assist customers to develop and optimize product life cycle, maintenance and warranty strategies during the development stage. To know more about �ۿ۴�ý’s services in this area, email or call us today.

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Benefits of 3D Techniques

�ۿ۴�ý — Fri, 21 Oct 2011 09:52:17 +0000

3D images are widely popular in , engineering and architecture, where drawing and designing are the most relevant. 3D animation and modeling is a career that is flourishing rapidly with more and more people choosing the same. Softwares like the 3D max make the designing process easy. The software is also useful for creating special visual effects while developing game characters, or animated characters in cartoons and movies. The architects and engineers, who develop of their projects, also prefer to create them in the 3D view. The output of the designs created in the software is obtained through the process known as 3D max rendering.

Images in the 3D format are easily comprehensible than the 2D designs. Hence, the modelers create 3D drafts or convert designs from 2D to 3D to work on all the minutest details. A model of a building created by an architect, for example, replicates the exact model of the proposed plan in the 3D design. It reflects the design from all angles, with exact measurements. Hence, 2D to 3D conversions is high in demand. Images in 3D formats, especially in the CAD software, can be zoomed in and zoomed out, which helps in viewing the minute areas clearly. Editing or modifying is also easily possible. Moreover, most of the softwares have the option such that the whole image modifies and gets corrected automatically according to the changes that the designer makes at one point. This helps in maintaining more accuracy with fewer errors.

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Manufacturing Bill of Materials

�ۿ۴�ý — Sat, 15 Oct 2011 05:41:51 +0000

A list of components, raw materials or assemblies required to complete the end product is known as the . BOM is classified into different categories, such as Engineering Bill of Materials, Sales Bill of Materials, Service Bill of Materials and Manufacturing Bill of Materials. The Manufacturing Bill of Materials, known as Manufacturing BOM or MBOM, consists of the list of all the parts and assemblies, including the packaging materials like the coloured boxes. It also incorporates the documentation included, such as the CDs and guides. Everything, that has been used at some or the other point of the manufacturing process has to be mentioned in the Manufacturing BOM. The liquid glue or tape also, if used, is mentioned under the Manufacturing Bill of Materials.

The contents of the Manufacturing Bill of Materials have to be accurate and in detail as much as possible. This helps the manufacturer or the retailer to take decisions on how to make the product reach the customer, cost effectively and efficiently. It also helps in saving much time. The details included in the Manufacturing Bill of Materials helps in other business related solutions such as Materials Resource Planning (MRP), Enterprise Resource Planning and Manufacturing Execution System (MES).

The Manufacturing Bill of Materials is often compared with the Process Plan since the content of both includes the information regarding the manufacturing process. Though similar to an extent, the Manufacturing Bill of Materials concentrates more on the product, while the Process Plan, as the name suggests, focuses on the process.

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