Group 25 - Pressure Washer - Revision history

MAE277 25 09: /* Executive Summary */

2009-12-13T06:07:55Z

Executive Summary

MAE277 25 09: /* Executive Summary */

2009-12-13T06:05:47Z

Executive Summary

MAE277 25 09: /* Introduction */

2009-12-13T05:29:58Z

Introduction

MAE277 25 09: /* Notes */

2009-12-13T05:29:04Z

Notes

MAE277 25 09: /* Gate 4 */

2009-12-13T05:27:44Z

Gate 4

MAE277 25 09: /* Gate 3: Coordination Review */

2009-12-13T05:27:10Z

Gate 3: Coordination Review

MAE277 25 09: /* References */

2009-12-13T05:25:59Z

References

MAE277 25 09: /* References */

2009-12-13T05:21:45Z

References

MAE277 25 09: /* References */

2009-12-13T05:21:16Z

References

MAE277 25 09: /* Gate 3: Coordination Review */

2009-12-13T05:11:11Z

Gate 3: Coordination Review

@@ Line 13: / Line 13: @@
 == Executive Summary ==
-This page documents each step of the reverse engineering of a pressure washer water pump. Our report describes in detail the processes of disassembly and reassembly of our product as well as the careful analysis of each component. This project was completed in a series of 5 gates, a system that is commonly used in industry today. Each gate required specific entry and exit criteria and had certain deliverables that needed to be provided to the instructors. The purpose of this project was to introduce mechanical and aerospace engineering students to real engineering problems and provide a means of applying what is learned in other engineering courses. In the fist gate, the request for proposal, our group outlines how we will approach the project. This includes a project schedule, distribution of tasks, and an initial look at the product. Gate 2, the preliminary design review, required our group to develop a detailed plan to disassemble our product and then carefully document the actual disassembly process. In gate 3, the coordination review, our group was able to fully understand the internal workings of our product. In this gate we analyzed each internal component in great detail and then made used solid modeling software to create renderings of these components. We determined how each component was manufactured, what purpose it served, and why it was engineered the way it was. In gate 4, the critical design review, our group reassembled our product and reflected back on the project. We were able to develop several design revisions that we feel would have improved the product. In our 5th and final gate, the product delivery, our group finalized our report orally presented our results.
+This page documents each step of the reverse engineering of a pressure washer water pump. Our report describes in detail the processes of disassembly and reassembly of our product as well as the careful analysis of each component. This project was completed in a series of 5 gates, a system that is commonly used in industry today. Each gate required specific entry and exit criteria and had certain deliverables that needed to be provided to the instructors. The purpose of this project was to introduce mechanical and aerospace engineering students to real engineering problems and provide a means of applying what is learned in other engineering courses. In the fist gate, the request for proposal, our group outlined how we would approach the project. This included a project schedule, distribution of tasks, and an initial look at the product. Gate 2, the preliminary design review, required our group to develop a detailed plan to disassemble our product and then carefully document the actual disassembly process. In gate 3, the coordination review, our group was able to fully understand the internal workings of our product. In this gate we analyzed each internal component in great detail and then used solid modeling software to create renderings of these components. We determined how each component was manufactured, what purpose it served, and why it was engineered the way it was. In gate 4, the critical design review, our group reassembled our product and reflected back upon the project. We were able to develop several design revisions that we feel would have improved the product. In our 5th and final gate, the product delivery, our group finalized our report orally presented our results.
 == Gate 1: Request For Proposal ==

← Older revision		Revision as of 06:05, 13 December 2009
Line 13:		Line 13:

	== Executive Summary ==		== Executive Summary ==
		+	This page documents each step of the reverse engineering of a pressure washer water pump. Our report describes in detail the processes of disassembly and reassembly of our product as well as the careful analysis of each component. This project was completed in a series of 5 gates, a system that is commonly used in industry today. Each gate required specific entry and exit criteria and had certain deliverables that needed to be provided to the instructors. The purpose of this project was to introduce mechanical and aerospace engineering students to real engineering problems and provide a means of applying what is learned in other engineering courses. In the fist gate, the request for proposal, our group outlines how we will approach the project. This includes a project schedule, distribution of tasks, and an initial look at the product. Gate 2, the preliminary design review, required our group to develop a detailed plan to disassemble our product and then carefully document the actual disassembly process. In gate 3, the coordination review, our group was able to fully understand the internal workings of our product. In this gate we analyzed each internal component in great detail and then made used solid modeling software to create renderings of these components. We determined how each component was manufactured, what purpose it served, and why it was engineered the way it was. In gate 4, the critical design review, our group reassembled our product and reflected back on the project. We were able to develop several design revisions that we feel would have improved the product. In our 5th and final gate, the product delivery, our group finalized our report orally presented our results.

	== Gate 1: Request For Proposal ==		== Gate 1: Request For Proposal ==

@@ Line 1: / Line 1: @@
 == Introduction ==
-This page documents the reverse engineering of a pressure washer water pump. This project was completed by students in group 25 of the MAE 277 class at the University at Buffalo.
+This page documents the reverse engineering of a pressure washer water pump. This project was completed as an assignment by students in group 25 of the MAE 277 class at the University at Buffalo.
 '''Members:'''<br>

@@ Line 1,182: / Line 1,182: @@
 We would like to suggest that the connecting rod journals in the water pump be of a split-clamp design as opposed to the solid hoop design that used by the manufacturer. This modification would make the disassembly of the product much easier in the case that the pump became clogged with debris or internal components needed replacement. Instead of having to use a bearing puller, the journals could instead be removed with two allen bolts.
-== Notes ==
+== References ==
 *[1] http://onlinemetals.com/alloycat.cfm?alloy304
 *[2] http://www.saws.org/latest_news/NewsDrill.cfm?news_id=399
 *[3] http://www.benbest.com/cryonics/pressure.html

@@ Line 1,134: / Line 1,134: @@
 The temperatures at which the failures will occur seem reasonable. From personal experience with boats and RV’s, I know that pipes tend to freeze and crack at these temperatures. Ice is unique in that it is one of very few substances that expand when they change phase from liquid to solid. When ice is subject to pressure, the melting point decreases. The pressure exerted on the inside of the pipe is actually liquid water trying to solidify. The relationship between pressure and temperature of ice is linear only for a certain range close to zero degrees Celsius. This form of ice is known as “ice-I”. Ice has 13 additional forms at higher pressures and lower temperatures that vary in crystal structure [3]. I am not sure if it was necessary to assume that the ice closed off the open end of the tube by freezing there first. I included this because I thought that the expanding water would need a normal force acting on it in every direction to maintain pressure. Water used in a pressure washer would most likely be municipal or well water. Water from both of these sources contains dissolved substances and has a different melting point than pure water. When materials fail, heat is often generated (mechanical energy is converted into thermal energy). If the cooling process occurs slowly, this heat would be dissipated to the surroundings and not affect the results. Strength of materials can depend on temperature. Many materials become brittle at low temperatures. However, I could not find suitable equations to apply this.
-== Gate 4 ==
+== Gate 4: Critical Design Review ==
 '''Product Reassembly'''<br><br>
 *''Step 1- Piston insertion<br>''

@@ Line 1,110: / Line 1,110: @@
 *Atmospheric pressure is constant, 1atm
 *Strength of material is constant, does not depend on temperature
-*Yield strength of 304 stainless steel is 31,200 psi, ultimate strength is 73,200 psi<ref>http://onlinemetals.com/alloycat.cfm?alloy304</ref>
+*Yield strength of 304 stainless steel is 31,200 psi, ultimate strength is 73,200 psi [1]
 <br><br>
 ''Governing Equations:''<br><br>
@@ Line 1,129: / Line 1,129: @@
 <br><br>
 ''Solution Check:''<br><br>
-According to a University of Illinois study, water pipes are at risk of freezing and bursting at temperatures below 20 degrees Fahrenheit. <ref>http://www.saws.org/latest_news/NewsDrill.cfm?news_id=399</ref>
+According to a University of Illinois study, water pipes are at risk of freezing and bursting at temperatures below 20 degrees Fahrenheit. [2]
 This is consistent with the results that I obtained in my analysis.<br><br>
 ''Discussion:''<br><br>
-The temperatures at which the failures will occur seem reasonable. From personal experience with boats and RV’s, I know that pipes tend to freeze and crack at these temperatures. Ice is unique in that it is one of very few substances that expand when they change phase from liquid to solid. When ice is subject to pressure, the melting point decreases. The pressure exerted on the inside of the pipe is actually liquid water trying to solidify. The relationship between pressure and temperature of ice is linear only for a certain range close to zero degrees Celsius. This form of ice is known as “ice-I”. Ice has 13 additional forms at higher pressures and lower temperatures that vary in crystal structure <ref>http://www.benbest.com/cryonics/pressure.html</ref>. I am not sure if it was necessary to assume that the ice closed off the open end of the tube by freezing there first. I included this because I thought that the expanding water would need a normal force acting on it in every direction to maintain pressure. Water used in a pressure washer would most likely be municipal or well water. Water from both of these sources contains dissolved substances and has a different melting point than pure water. When materials fail, heat is often generated (mechanical energy is converted into thermal energy). If the cooling process occurs slowly, this heat would be dissipated to the surroundings and not affect the results. Strength of materials can depend on temperature. Many materials become brittle at low temperatures. However, I could not find suitable equations to apply this.
+The temperatures at which the failures will occur seem reasonable. From personal experience with boats and RV’s, I know that pipes tend to freeze and crack at these temperatures. Ice is unique in that it is one of very few substances that expand when they change phase from liquid to solid. When ice is subject to pressure, the melting point decreases. The pressure exerted on the inside of the pipe is actually liquid water trying to solidify. The relationship between pressure and temperature of ice is linear only for a certain range close to zero degrees Celsius. This form of ice is known as “ice-I”. Ice has 13 additional forms at higher pressures and lower temperatures that vary in crystal structure [3]. I am not sure if it was necessary to assume that the ice closed off the open end of the tube by freezing there first. I included this because I thought that the expanding water would need a normal force acting on it in every direction to maintain pressure. Water used in a pressure washer would most likely be municipal or well water. Water from both of these sources contains dissolved substances and has a different melting point than pure water. When materials fail, heat is often generated (mechanical energy is converted into thermal energy). If the cooling process occurs slowly, this heat would be dissipated to the surroundings and not affect the results. Strength of materials can depend on temperature. Many materials become brittle at low temperatures. However, I could not find suitable equations to apply this.
 == Gate 4 ==

@@ Line 1,183: / Line 1,183: @@
 == References ==
-http://onlinemetals.com/alloycat.cfm?alloy304
+*http://onlinemetals.com/alloycat.cfm?alloy304
-http://www.saws.org/latest_news/NewsDrill.cfm?news_id=399
+*http://www.saws.org/latest_news/NewsDrill.cfm?news_id=399
-http://www.benbest.com/cryonics/pressure.html
+*http://www.benbest.com/cryonics/pressure.html
-<references/>

← Older revision		Revision as of 05:21, 13 December 2009
Line 1,183:		Line 1,183:

	== References ==		== References ==
		+	http://onlinemetals.com/alloycat.cfm?alloy304
		+	http://www.saws.org/latest_news/NewsDrill.cfm?news_id=399
		+	http://www.benbest.com/cryonics/pressure.html
	<references/>		<references/>