Group 17: Gate 3: Product Analysis - Revision history

MAE 277 2012 - Group 17: /* Design Revisions */

2012-12-14T19:45:21Z

Design Revisions

MAE 277 2012 - Group 17: /* Product Analysis */

2012-12-14T19:33:17Z

Product Analysis

MAE 277 2012 - Group 17: /* Introduction */

2012-12-14T18:53:41Z

Introduction

MAE 277 2012 - Group 17: /* Introduction */

2012-12-14T18:51:29Z

Introduction

MAE 277 2012 - Group 17: /* Solid Modeled Assembly */

2012-12-14T18:46:41Z

Solid Modeled Assembly

MAE 277 2012 - Group 17 at 15:57, 14 December 2012

2012-12-14T15:57:04Z

MAE 277 2012 - Group 17: /* Engineering Analysis */

2012-12-14T15:50:37Z

Engineering Analysis

MAE 277 2012 - Group 17: /* Engineering Analysis */

2012-12-14T15:50:01Z

Engineering Analysis

MAE 277 2012 - Group 17: /* Engineering Analysis */

2012-12-14T15:49:04Z

Engineering Analysis

MAE 277 2012 - Group 17: /* Solid Modeled Assembly */

2012-12-14T15:44:24Z

Solid Modeled Assembly

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 The following design revisions are recommended in place of the current component, or subsystem.  They are intended to enhance the performance of the product in the domain of one or more of the GSEE factors.
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-:*Composite Drive Shaft Housing:   Utilization of a composite light weight material would reduce the overall weight of the product.  Reduced product weight would make it accessible to a broader range of users. Permitting a feebler user to properly operate the weed whacker.  It could also, make the product safer to use by allowing greater control of the product for able bodies users.  Finally, a lighter product could appeal to a user intending to operate the product over a longer range of time.  Making it more feasible for the user to endure, sustained use of the product.
+:*Composite Drive Shaft Housing:   Utilization of a composite light weight material would reduce the overall weight of the product.  Reduced product weight would make it accessible to a broader range of users, permitting a feebler user to properly operate the weed whacker.  This would benefit in the face of societal concerns about the aging populations in developed countries, especially as people are more likely to remain in their own home during retirement than they were in the past. It could also, make the product safer to use by allowing greater control for able bodied users.  Finally, a lighter product could appeal to a user intending to operate the product over a longer range of time, making it more feasible for the user to endure, sustained use of the product.
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-:*Electric Start for A Gas Motor:  An electric starter for a gas powered mower would improve the overall user experience.  It would facilitate the arduous engine start up process.  The starter would take the physical strain out of starting the engine via the pull cord.  This feature would need to be coupled with a few other minor design adjustments.  An electric starter would require a power source.  A battery could be used to supply the necessary energy. However, a battery may be too large to reasonably mount to the weed whacker.  Another more practical option for an electric starter would be a plug that can be connected to an extension cord, and then connected to the wall.  A plug would not significantly increase the weight of nor would nor would it be difficult to find a convenient place for it.  The electrical start can be considered a societal consideration due to its influence on the intended marketable audience.
+:*Electric Start for A Gas Motor:  An electric starter for a gas powered moter would improve the overall user experience.  It would facilitate the arduous engine start up process.  The starter would take the physical strain out of starting the engine via the pull cord.  This feature would need to be coupled with a few other minor design adjustments.  An electric starter would require a power source.  A battery could be used to supply the necessary energy. However, a battery may be too large to reasonably mount to the weed whacker.  Another more practical option for an electric starter would be a plug that can be connected to an extension cord, and then connected to the wall.  A plug would not significantly increase the weight of nor would nor would it be difficult to find a convenient place for it.  The electrical start can be considered a societal consideration due to its influence on the intended marketable audience, fitting into the same accessibility concerns as the composite shaft housing.
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-:*Electric Motor:  Exchanging the gas engine out for an electric motor would make the product more environmentally friendly, by eliminating any emissions that the gas engine would produce.  An electric motor would also improve the products function in society.   An electric motor is much quieter than a gas engine and subsequently would be more beneficial in suburban neighborhoods.  Economically the electric motor would cause an increase in the initial cost of the product, but would reduce the costs associated with product operation.  Along with the electric motor two other components would need to be replaced.  The cable driven throttle would need to be replaced with an on/off trigger to signal the engine.  Finally, the gas tank would need to be replaced with a battery in order to supply the  engine with the appropriate form of energy.
+:*Electric Motor:  Exchanging the gas-powered motor out for an electric motor would make the product more environmentally friendly, by eliminating any emissions that the IC motor would produce.  An electric motor would also improve the product's function in society, by appealing to the expanding base of users that consider the environment in many of their daily actions.  An electric motor is much quieter than a gas engine and subsequently would be more beneficial in suburban neighborhoods, where the societal concern of noise pollution is important to many users and their neighbors.  Economically, the electric motor would cause an increase in the initial cost of the product, but would reduce the costs and maintenance associated with product operation.  Along with the electric motor two other components would need to be replaced.  The cable driven throttle would need to be replaced with an on/off trigger to signal the engine.  Finally, the gas tank would need to be replaced with a battery in order to supply the motor with the energy required for operation. This revision is becoming much more feasible than it would've been in the past due to the development of much more lightweight and long-lasting Li-Polymer batteries, along with the decreasing cost and greatly improved Power:Weight ratio of brushless DC motors.
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 ==Navigation==
 [[Group 17 - Homelite Line Trimmer (Gasoline Powered)|Main Page]]<br>

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 '''Shaft Assembly'''
-*If someone is uncomfortable while using a product, it places a black mark on that particular company’s reputation. The shaft being curved allows for a more comfortable and ergonomic use. This feature makes it for taller people to operate because it allows them to remain upright instead of in a bent over position. The foam grip and handle also allows for a more comfortable feel. This plays into societal factors since every user enjoys a product that is easy to operate. If the user enjoys the feel and comfort of the product, then a higher quantity of the product will be sold.
+*In today's day and age, the ergonomics of a product are a key factor to consider in any design. The shaft being curved allows for a more comfortable and ergonomic use. This feature makes it for taller people to operate because it allows them to remain upright instead of in a bent over position. The foam grip and handle also allows for a more comfortable feel. This plays into societal factors since every user enjoys a product that is easy to operate. If the user enjoys the feel and comfort of the product, then a higher quantity of the product will be sold.
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 ==Introduction==
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-	In the last gate, we went through the process of dissecting the weedwhacker. Since dissecting the product, we have been able to study its inner workings and subsystems in much more detail, down to the level of individual componenets; as well as analyze the original decisions that were made in the product’s design. Given this information, along with firsthand user experience, the group will formulate revisions we would make to the design based on one or more of the GSEE factors. In addition, we will cover the action we have taken as a group since completing the last gate to ensure we work together fairly and efficiently.
+	In the last gate, we documented the process of dissecting the weedwhacker. With the product broken up into its components, we have been able to study its inner workings and subsystems in much more detail; as well as analyze the original decisions that were made in the product’s design. Given this information, along with firsthand user experience, the group will formulate revisions we would make to the design based on one or more of the GSEE factors. In addition, we will cover the action we have taken as a group since completing the last gate to ensure we work together fairly and efficiently.
 == Project Management: Coordination Review ==

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 ==Introduction==
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 == Project Management: Coordination Review ==

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 === Solid Modeled Assembly ===
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-We designed a model of the piston and crankshaft moving as they would within the engine block using Inventor.
+We created a solid modeled of the piston and crankshaft moving as they would within the engine block using Autodesk Inventor. We chose these components because they form the key mechanism for transferring the chemical energy stored in the fuel to mechanical energy that can be transmitted through the driveshaft.
 [[File:Moving_Piston.gif]]
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← Older revision		Revision as of 15:57, 14 December 2012
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	<br>		<br>
	<br>		<br>
		+	==Navigation==
		+	[[Group 17 - Homelite Line Trimmer (Gasoline Powered)\|Main Page]]<br>
		+	[[Group 17: Gate 1: Project Planning\|Gate 1]]<br>
		+	[[Group 17: Gate 2: Product Dissection\|Gate2]]<br>
		+	[[Group 17: Gate 4: Product Explanation\|Gate 4]]

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 Using the measured radius it is possible to carry out the following calculation.
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-[[File:Group17FinalDimensions.jpg]]
+[[File:Group17FinalDimension.jpg]]
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 As a result of using a cable shaft diameter of 4 mm the shaft is able to withstand approximately 14.58 N*m of torque, about 2 times the amount of torque that the 26 cc engine motor is able to produce.

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 '''Calculations for Minimum Cable Radius:'''
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-[[File:Group17CRCalculations]]
+[[File:Group17CRCalculations.jpg]]
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 .17mm< Inside radius of the Shaft Housing
@@ Line 167: / Line 167: @@
 Using the measured radius it is possible to carry out the following calculation.
 <br>
-[[Group17FinalDimensions]]
+[[File:Group17FinalDimensions.jpg]]
 <br>
 As a result of using a cable shaft diameter of 4 mm the shaft is able to withstand approximately 14.58 N*m of torque, about 2 times the amount of torque that the 26 cc engine motor is able to produce.

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 '''Governing Equations: '''
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- τmax = Tc/J
+[[File:Group17GoverningEquations.jpg]]
- T = Torque
- c = radius of steel rod
- J = (½)*π*c4 for a steel rod
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 '''Calculations for Minimum Cable Radius:'''
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- τmax = Tc/(½)*π*c4 -> τmax = T/(½)*π*c3 -> c = (T/( τmax *(½)* π ))(1/3)
+[[File:Group17CRCalculations]]
- c = ((7.3 N*m)/(1.45*108 Pa*0.5*3.1416))1/3 = 3.17*10-3 m = 3.17 mm
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 .17mm< Inside radius of the Shaft Housing
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 Using the measured radius it is possible to carry out the following calculation.
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- τmax = Tc/(½)*π*c4 -> T = (τmax*π*c4)/2c -> T = (τmax*π*c3)/2
+[[Group17FinalDimensions]]
- T = ((145*106 Pa)*3.1416*(0.0043))/2 = 14.58 N*m
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 As a result of using a cable shaft diameter of 4 mm the shaft is able to withstand approximately 14.58 N*m of torque, about 2 times the amount of torque that the 26 cc engine motor is able to produce.