P14452: Dresser-Rand Compressor Wired Data Recorder
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Problem Definition

Table of Contents

Project Summary

The purpose of this project is to design a universal data recording device to monitor the health of a Dresser-Rand compressor during operation. In particular, this device must be able to operate in a hazardous environment where traditional wired solutions are difficult or even impossible to implement. It will also need to record analog data from a variety of sensors, at multiple predefined sampling rates.

The previous iteration of this project was able to wirelessly transmit shaft vibration data, while mounted on a moving component of the compressor, but was unable to prove that that the timestamps for particular samples were synchronized with the data points. For this next iteration of the design, two new devices shall be developed which improve upon the previous design in size, weight, and flexibility of configuration. The first device shall be able to function in a harsh environment (high temperature, pressure, oil, vibration). The second device shall function in normal laboratory conditions, but on a miniature scale.

Design Drivers

Customer

Business

Design Team

"Strut Our Stuff"

Multidisciplinary

Customer Needs

Number Need Description
CR1 Ease of Use The device should be a small, easily mountable unit with no external wires and a variable sample rate. It should also offer universal sensing.
CR2 Data Capture The device should be able to provide power to and store data collected from the sensors. It should be able to support multiple sample rates.
CR3 Accuracy The device should provide an accurate timestamp with data collection. It should allow high frequency sampling with precision values.
CR4 Durability The device should be able to withstand harsh environmental conditions and easily mountable on moving parts.
CR5 Multiple Sensors The device should be able to allow multiple inputs from sensors simultaneously.

Questions For First Customer Interview

Answer From First Customer Interview

Customer Needs (Excel)

Engineering Requirements

Current Requirements

Number Importance Source Name Measure Units Lowest Value Ideal Value Max Value
ES1 Medium CR1 Easily Mountable Process Number of Steps 1 1 10
ES2 High CR1 Small Size Volume in^3 0 1 5
ES3 Low CR1 Set Sampling Rate in Field Present Binary no yes yes
ES4 High CR1 No External Wires Not Present Binary yes no no
ES5 Medium CR1 Universal Sensor Connector Present Binary no yes yes
ES6 High CR2 Types of Sensor # of Different Sensors Integer 1 3
ES7 High CR2 Data Storage Capacity (Time) min 1 60 1440
ES7.1 Medium CR2 Start Capture Present Binary no yes yes
ES7.2 Medium CR2 Stop Capture Present Binary no yes yes
ES8 High CR2 Power To Sensors Voltage V 3.3V 5V 5V
ES9 Medium CR2 Multiple Sampling Frequencies Frequency Hz 0.1 Variable 20000
ES10 High CR3 Timestamps Accuracy % of Timestep -50% 0% 50%
ES11 High CR3 High Sampling Frequency Max Sampling Frequency kHz 20 20 30
ES12 Medium CR3 Digital Bit Width (Accuracy) Bits per Sample bits 10 12 16
ES12.1 High CR3 Voltage Accuracy ADC LSB mV --- 10 ---
ES13 Medium CR4 Harsh Environment Passing of Sub-specifications
ES13.1 Medium CR4 High Temperature Temp F 0 140 300
ES13.2 Medium CR4 High Pressure Pressure PSI 100 100 250
ES13.3 Medium CR4 Oily Environment Possible binary no yes yes
ES13.4 Medium CR4 Withstand Vibration Acceleration G's 1G 5G 15G
ES14 Medium CR4 Mountable on Moving Part Possible binary no yes yes
ES15 Low CR5 Multiple Sensors Maximum Sensors Integer 2 3 4
ES16 High CR2 Sensor Voltage Range Voltage V 0V --- 10V
*Vibration added

*Max Sampling Rate increased

*Ideal Temperature decreased

*Sensor Voltage Range Min. moved to 0V

Requirement Iterations

Engineering Requirements 1

Engineering Specifications 2 (Updated 11/5)

Engineering Specifications 3 (Updated 12/9)

MSD I MSD II Overview

Planning & Execution

Problem Definition

Systems Design

Detailed Design

Planning & Execution

Build, Test, Document

Final Presentation

Technical Paper

Poster

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