Case Help Manual

Table of Contents

Preface

Section 1. Introduction

Section 2. Ring Analysis Program

Section 3. Piston Analysis Program

Section 4. Fegen Program

Section 5. Pheat Analysis Program

Section 6. Pdist Analysis Program

Section 7. Plotit Line/Contour Plot Program

Section 8. Animate Dynamic Animation Program

Section 9. Feplot Finite Element Plot Program

Section 10. Twist Analysis Program

Section 11. Section Analysis Program

Appendix A. Systems of Units

Appendix B. Input Data Files

Appendix C. Input and Output Units

Appendix D-1. ANIMATE - OILFUNC

Appendix D-2. OILPROP - RINGMOD

Appendix D-3. RINGPAC - VOLUME

Appendix E. Block Data File Formats

All of the allowable input data lines that are used in the CASE system programs are described on the following pages. They are listed in alphabetical order but may be included in any order in the input data file.

The first seven characters of an input data line must be the mnemonic code, including any blanks. For example, the CONROD input data line must begin in column 1 with the six characters C, O, N, R, O, D and a blank space in column 7. The CONROD data entries are then located anywhere in columns 8 through 256 and separated by one or more blank spaces.

A list of the eighty-three allowable input data lines is given in Table D-1 on the following pages. This table contains a brief description for each data line.

DATA LINE DESCRIPTION
ANIMATE Animation specification
BTEMP Bore temperature data file
none Comment line
C Comment line
C****** Comment line
CONROD Defines connecting rod geometry and mass
CONTROL Specifies control parameters
CYLBORE Defines the bore diameter and stroke
DAMPF Defines damping force parameters
DATE Analysis date to be printed with output
DCOEFF Defines an orifice discharge coefficient
DISTORT Mechanical bore distortion data file
DRANGE Specifies crank angle range for a dump
DUMPIT Selects intermediate results for printout
ENDCL Defines ring end clearance
ENGINE Defines engine speed
FCOEF Defines friction coefficients
FEMODEL Defines lubricant film finite element model
GAPAREA Defines ring gap areas (top seating)
GAPBOT Defines ring gap areas (bottom seating)
GAREA Variable ring gap area data file
GASFLO Defines an alternate gas flow equation
GASPRES Combustion gas pressure data file
GFLOW Lubricant flow through grooves
GROOVE Defines groove geometry
LEAKAGE Specifies a minimum gas leakage area
LPORT Defines the port location for two-stroke engine
LUBBC Lubricant boundary condition
MASSES Defines piston mass
MATL Defines material properties
OILFUNC Oil viscosity/temperature function
OILPROP Oil visosity at two temperatures
OILRING Defines the geometry of an oil control ring
OILTYPE SAE Grades of oil
ORGORI Oil ring groove orifice area
OVALITY Defines piston skirt ovality
PARAM Specifies the value of a parameter
PDROP Defines piston skirt drop
PFILE1 Piston axial face profile data file
PFILE2 Piston skirt flexibility data file
PFILE3 Piston gas pressure distortions data file
PFILE4 Piston inertia loading distortions data file
PFILE5 Piston thermal distortions data file
PIN Defines the piston pin diameter and location
PISTON Defines the piston geometry
PLOTIT Plotting specifications
PMATL Specifies the piston material
PRCODE Specifies gage or absolute pressure
PRESURE Saved gas pressure data file
PRINTIT Printout specifications
PTEMP Piston land and groove temperatures
PTILT Piston tilt angle data file
PTLOAD Defines piston thermal loads
RFACE1 Barrel face profile
RFACE2 Parabolic face profile
RFACE3 Taper face profile
RFACE4 Composite face profile
RFACE5 Composite face profile
RFACE6 Worn taper face profile
RFACE7 General ring face profile data file
RGAPLOC Ring gap locations
RINGMOD Defines internal bevel or step
RINGPAC Defines number and type of rings
RINGPS Compression ring pressure shape data file
RINGTEN Defines piston ring tension
RLOCATE Defines ring groove locations
RMASS Specifies a piston ring mass
RMATL Secifies a piston ring material
RODMATL Defines the connecting rod material
RSECT Defines a ring cross section
RSPROP Defines ring section properties
RTEMP Ring temperture data file
RTWIST Defines ring twist angles
SAVEPR Save groove/inter-ring twist angles
SAVETA Save piston tilt angles
SEATING Defines a ring pivot location in the groove
SKIRT Defines piston skirt geometry
STRIBEK Stribeck diagram parameters
SUMPPRE Defines sump pressure
SURFACE Surface roughness of rings, piston and bore
THERMAL Thermal bore distortion data file
TITLE1 Analysis title
TITLE2 Analysis subtitle
TWISTFL Defines a ring twist file
UNITS Defines the default system of units
VOLUME Defines piston crevice volumes

QUANTITY SYSTEM CODE Description
1 2 3 4 5 6
01 ACCEL IN/S2 M/S2 CM/S2 CM/S2 M/S2 M/S2 Acceleration
02 ANGLE DEG DEG DEG DEG DEG DEG Angle
03 AREA IN2 M2 CM2 CM2 MM2 MM2 Area
04 COEFTE 1/F 1/K 1/C 1/K 1/K 1/K Coefficient of Thermal Expansion
05 CONDUCT BTU/INSF W/MK CAL/CMSC W/CMK W/MK W/MK Conduction Coefficient
06 CONVECT BTU/IN2SF W/M2K CAL/CM2SC W/CM2K W/M2K W/M2K Convection Coefficient
07 DENS LBM/IN3 KG/M3 KGFS2/CM4 G/CM3 KG/M3 KG/M3 Mass Density
08 ENERGY FTLBF J J J J J Energy or Work
09 FMOI IN3 M3 CM3 CM3 M3 M3 First Moment of Inertia
10 FORCE LBF N KGF DYNE N N Force
11 FREQ RPM RPM RPM RPM RPM RPM Frequency or Rotational Speed
12 LENGTH IN M CM CM MM MM Length
13 MASFLO LBM/S KG/S KG/S G/S KG/S KG/S Mass Flow
14 MASS LBM KG KG G KG KG Mass
15 MMOI LBMIN2 KGM2 KGM2 KGM2 KGM2 KGM2 Mass Moment of Inertia
16 MO INLBF/S KGM/S KGCM/S GCM/S KGM/S KGM/S Momentum
17 MODULUS PSI PA KGF/CM2 DYNE/CM2 PA PA Modulus of Elasticity
18 MOMENT INLBF NM KGFCM DYNECM NM NM Moment
19 POWER HP W W W W W Power
20 PRESS PSI PA KGF/CM2 DYNE/CM2 KPA KPA Pressure
21 SMOI IN4 M4 CM4 CM4 M4 M4 Second Moment of Inertia
22 SPWT LBF/IN3 N/M3 KGF/CM3 DYNE/CM3 N/M3 N/M3 Specific Weight
23 STIFF LBF/IN N/M KGF/CM DYNE/CM N/M N/M Stiffness (longitudinal)
24 TEMP F K C K C K Temperature
25 TIME S S S S S S Time
26 VEL IN/S M/S CM/S CM/S M/S M/S Velocity
27 VISDYN CP CP CP CP CP CP Dynamic Viscosity
28 VISKIN CST MM2/S MM2/S MM2/S MM2/S MM2/S Kinematic Viscosity
29 VOLFLO FT3/S M3/S CM3/S CM3/S L/S L/S Volume Flow
30 VOLUME IN3 M3 CM3 CM3 MM3 MM3 Volume

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