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Stan Schumann

Retired

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experience

Senior Design Engineer  
Wabtec Passenger Transit, November 2000 to Present

Responsibilities: Mechanical and electrical design for rail air brake compressor systems for mass transit systems including; specification review, solid modeling, documentation, field prototype assembly and testing, qualification testing and marketing support. Highlights: Packaged oil free reciprocating compressor system to fit under R46 class subway car in New York. Packaged reciprocating compressor systems for Miami airport, Boston Blue line, Atlanta airport, and Dulles airport. Packaged screw compressor for Mexico City overhaul. Technical and marketing support for New York City R142, R142A, R143, R142S and R160 subway car air compressors. Member of team developing oil less reciprocating compressor for rail applications.

Senior Design Engineer  
Emerson Climate Technologies, September 1987 to November 2000

Responsibilities: Development of new displacement scroll element compressors for alternate refrigerants. Provide technical leadership for compressor development and improvement projects including performance and reliability testing. Plan and implement cost reduction programs for high volume scroll element compressors. Developed production ready version of modulated scroll element compressor. Directed the coding and compilation of scroll compressor force calculations into a user-friendly software package with user and theoretical manual. Wrote software and implemented a computer-based system to measure oil film thickness in journal bearings operating in both a reciprocating and scroll element a hermetic compressor. Created technique to measure impact of free-floating suction reeds on constraining pin. Developed system to measure instantaneous motor torque in a running hermetic compressor. Investigated influence of entrained oil on several different classes of gas flow meters. Explored influence of liquid refrigerant on compressor operation and found a method to estimate the amount using gamma ray densiometer. Developed and implemented instrumentation to measure orbit and unloading of a scroll element compressor. Created procedure to analyze data from field test sites displaying compressor operating map.

Senior Engineer  
Owens Corning Fiberglas, June 1977 to September 1986

Responsibilities: Develop test methods and equipment for fiberglass products. Highlights: Wrote software and implemented computer-based system to measure glass fiber diameter. The system saved about 7 hours per measurement series. Developed quick tack test procedure for a two part adhesive system, which allowed evaluation of material prior to processing. Created a process to apply facing during curing cycle on uncured fiberglass material. Calibrated, in place, two temperature sensors embedded in a 4-foot square guarded hot plate. Designed and built high-temperature thermal conductivity tester for calcium silicate block insulation. Maintained formulated thermal process curves to ensure thermal performance of insulation products. Repaired, calibrated and assisted in the maintenance of quality control equipment in production facilities. Assembled calibration lab to maintain traceability to NBS for product laboratory and plant quality control laboratories.

education

Wright State University  
Master Of Science, Mechanical Engineering, Jan, 1994 to Jan, 1998


The Ohio State University  
BSME, Mechanical Engineering, Jan, 1972 to Jan, 1976


patents

Compressor Reed Valve   (6044862)    
Inventors: Stanley Schumann, Frank Wallis, Jason Beresik, Ernie Bergman, Deborah Monnin.  Issued April 04, 2000  in United States

Scroll Machine with Capacity Modulation  (6116867)    
Inventors: Frank Wallis, Stan Schumann, Jeff Berning.  Issued September 12, 2000  in United States

Scroll Machine with Capacity Modulation   (6120255)    
Inventors: Stan Schumann, Don Fiegel, Jeff Berning.  Issued September 19, 2000  in United States

Scroll Machine with Capacity Modulation   (6176686)    
Inventors: Frank Wallis, Stan Schumann, Jeff Berning.  Issued January 23, 2001  in United States

publications

Air Compressors for Passenger Rail Applications     
Published by (Proceedings of the Nineteenth International Compressor Engineering Conference at Purdue)
Authors: Stan Schumann.  Published July 14, 2008

Passenger transit rail systems rely on compressed air for brake and suspension systems. These applications pose design challenges for the compressor system not usually faced by industrial applications. The air supply is packaged as a self-contained system generally containing a compressor, electric drive motor, air dryer system, and controls. The air system supplier initially furnishes the system to a car builder under contract to a transit authority. Both the car builder and the transit authorities publish specifications for package size, materials, and workmanship constraints making each compressor system custom designed for the application. General trends in the industry include the extension of overhaul and maintenance on the air system. In order to meet these new requirements, it was necessary to determine exactly how these systems operate in the field in terms of running time and cycle rate. To this end, air supply systems were instrumented with simple logging systems to monitor compressor operation. A summary from field studies from various locations is presented.

Measurement of Orbiting Scroll Motion     
Published by (Proceedings of the Twelfth International Compressor Engineering Conference at Purdue)
Authors: Stan Schumann.  Published July 19, 1994

In a scroll compressor, the orbit path of the moving scroll is important to ensure an efficient product. Any deviation from a circle during running indicates a flank separation causing leakage and a loss of efficiency. During compressor shutdown, the motion is also important as it is an indication of radial unloading and the pressure equalization time across the compressor. At startup, the motion indicates the relative speed of compressor loading and can increase or decrease starting torque requirements for the compressor. Unfortunately, the orbit measurement can be difficult to make. This paper describes a method to measure the orbit using four cantilever beams. By fixing two beams to the bearing housing and two others to the oldham ring, with proper calibration the orbit can be referenced to the bearing housing.

Evaluation of Residential Heat Pump Operation using a Binned Time Method     
Published by (Proceedings of the XVIIIth International Congress of Refrigeration)
Authors: Stan Schumann, Tom Bodey.  Published July 10, 1991

The use of data from existing heat pump systems assists in the selection of accelerated testing conditions for a residential heat pump compressor. Data are accumulated into time bins and graphically displayed for easier comprehension

3420 - Real Gas Critical Flow Factors for R-1 2, R-22 and R-502     
Published by (ASHRAE Transactions, vol. 96, pt. 2, St. Louis 1990)
Authors: Stan Schumann.  Published June 09, 1990

Critical flow devices, either venturis or nozzles operating at choked conditions, are popular as transfer standards and metering devices. Stagnation temperature and pressure upstream of the nozzle determine the flow rate, provided downstream pressure is low enough to ensure choked flow. Such devices are consistent and make excellent transfer standards for many laboratories. Introduces the concept of critical flow devices to the refrigeration industry, as well as provide basic tables for their use.