Helmet-Mounted Displays: - USAARL - The - U.S. Army

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206 B. Joseph McEntire Type Reference helmet Foam pads APH-5 APH-6 Three-strap sling Thermoplastic Liner (TPL TM ) Pads, mesh, & drawstring Thermofit Liner (TFL TM ) SPH-3 SPH-4 SPH-4 SPH-4B HGU -56/P Others . . . Table 7.2. Helmet fitting systems. Fielding status No longer used Some SPH-4 still in use Currently fielded IHADSS Currently fielded Various SPH and HGU types Attributes Various pad thicknesses accommodated variable head sizes. Comfort dependent on user. Individual strap adjustment provided user adjustability. Comfort difficult to achieve, some individuals experience significant discomfort, others had no problems. Attachment clips contributed to SPH-4 impact attenuation. Widely accepted in the aviation environment. Can be individually fitted by heating. Can be cleaned. May adversely affect helmet stability. Durable. Difficult to comfortably fit the IHADSS helmet. May degrade helmet retention if too many pads are used to ob tain comfortable fit. Special cases Currently used by USAARL when comfortab le fits cannot be attained with the standard issue TPL TM . Performance still under evaluation. Table 7.2. (continued)
Type Reference helmet Foam in place Silicon foam fill Epoxy coated foam Custom foam fit HGU -33/P SPH-3C Fielding status Not used by the Army Biodynamics 207 Attributes Provides an individual fit with little adjustment tolerance. Provides a stable fit, can become uncomfort-able if helmet is not repositioned to original fitting location. Difficult to obtain consistent foam density. Could affect impact attenuation performance. developmental Proposed Provides an individual fit. Pliable to relieve pressure points after redonning the helmet. Durability, operational performance, and user acceptability are unknown. developmental Proposed for Comanche helmet U.S. Navy fixed-wing night attack helmet Provides a stable, individual fit. Can beco me uncom fortable if not repositioned to original fitting location. Durability, operation performance, and user acceptability are unknown. Operation Provides a stable, individual fit. Requires a wax mold of the aviator’s head be taken. Liner custom made to casting made from wax mold, at manufacturer’s plant. Lengthy time process.
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Helmet-Mounted Displays: Design Iss
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The views, opinions, and/or finding
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vi Contents 4. Visual Coupling Clar
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viii Contents References ..........
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x Ben T. Mozo, Research Physicist U
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xii Foreword began its phenomenal e
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xiv Preface Acknowledgments The aut
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Introductory Overview 1 Clarence E.
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Introductory Overview 5 Figure 1.2.
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Introductory Overview 7 The trend f
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Introductory Overview 9
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Introductory Overview 11 aviator to
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Introductory Overview 13 1970's. Ta
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Introductory Overview 15 Image sour
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Introductory Overview 17
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Table 1.3. HMD performance figures-
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Introductory Overview 21 direct vie
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Introductory Overview 23 Figure 1.9
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Introductory Overview 25 Figure 1.1
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Introductory Overview 27 Ercoline,
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Introductory Overview 29 II, Procee
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Introductory Overview 31 Armstrong
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34 Clarence E. Rash, Melissa H. Led
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40 Liquid crystal Clarence E. Rash,
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Optical Designs 3 William E. McLean
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Optical Designs 57 and plotted in l
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Optical Designs 59 phosphors, (b) u
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Optical Designs 61 optics. Examples
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Optical Designs 63
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prism combiner. Optical Designs 65
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Figure 3.2. (continued) Optical Des
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Optical Designs 69
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Optical Designs 71 Figure 3.4. Comp
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Optical Designs 73 Figure 3.6. Opti
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Optical Designs 75 Figure 3.8. Refl
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Optical Designs 77 Figure 3.9. Ray
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Optical Designs 79 incidence and re
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80 Clarence E. Rash hinted at befor
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82 Clarence E. Rash metal tolerant
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84 Clarence E. Rash the performance
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86 Clarence E. Rash Figure 4.3. Hig
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88 Clarence E. Rash imagery in HMDs
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90 Clarence E. Rash as with ANVIS.
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92 Clarence E. Rash performance, on
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94 Clarence E. Rash effects on visu
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96 Clarence E. Rash concerning roll
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98 Aeromedical Research Laboratory.
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DESIGN ISSUES PART TWO
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102 Clarence E. Rash and William E.
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104 Contrast Clarence E. Rash and W
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Page 173 and 174: 156 Clarence E. Rash and William E.
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Page 187 and 188: Visual Performance 6 William E. McL
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Page 193 and 194: Visual Performance 175 perception.
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Page 197 and 198: Visual Performance 179 individuals
Page 199 and 200: Visual Performance 181 0 to -5.25 d
Page 201 and 202: Visual Performance 183 Report No. 9
Page 203 and 204: Biodynamics 7 B. Joseph McEntire He
Page 205 and 206: Biodynamics 187 behavior of this de
Page 207 and 208: Figure 7.2. Head anatomical coordin
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Page 211 and 212: Biodynamics 193 al., 1972), and man
Page 213 and 214: Biodynamics 195 Figure 7.5. Vertica
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Page 217 and 218: Biodynamics 199 been fabricated int
Page 219 and 220: Biodynamics 201 Ty pic al acc ele r
Page 221 and 222: Biodynamics 203 exceed the mechanic
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Page 227 and 228: Biodynamics 209 the fitting problem
Page 229 and 230: Biodynamics 211 adjustment buckle,
Page 231 and 232: Biodynamics 213 down. The helmet ma
Page 233 and 234: Biodynamics 215 Desert Shield/Deser
Page 235 and 236: Biodynamics 217 Donelson, S. M., an
Page 237 and 238: 219 Fort Rucker, AL: U.S. Army Aero
Page 239 and 240: 220 Ben T. Mozo Figure 8.1. Noise l
Page 241 and 242: 222 Ben T. Mozo available in the ne
Page 243 and 244: 224 Ben T. Mozo Protectors”(ANSI,
Page 245 and 246: 226 Ben T. Mozo language. Tests of
Page 247 and 248: 228 Ben T. Mozo Figure 8.6. Speech
Page 249 and 250: 230 Ben T. Mozo the communications
Page 251 and 252: 232 Ben T. Mozo Item Mass (grams) C
Page 253 and 254: Ribera, J. E., and Mozo, B. T. Unda
Page 255 and 256: 236 Joseph R. Licina operational us
Page 257 and 258: 238 Joseph R. Licina Standard MIL-S
Page 259 and 260: 240 Joseph R. Licina On electro-opt
Page 261 and 262: 242 Joseph R. Licina For HMDs with
Page 263 and 264: 244 Joseph R. Licina 1994b) that wi
Page 265 and 266: 246 Joseph R. Licina Table 9.2. Hea
Page 267 and 268: 248 Joseph R. Licina provided a 93.
Page 269 and 270: 250 Joseph R. Licina and buckles, a
Page 271 and 272: 252 Joseph R. Licina authorized to
Page 273 and 274: 254 Joseph R. Licina a nuclear flas
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256 Joseph R. Licina requirements:
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HMD PERFORMANCE ASSESSMENT PART THR
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262 Clarence E. Rash, John C. Mora,
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Glossary 11
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270 making stereoposis possible. Bi
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272 John C. Mora and M elissa H. Le
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NOTES ON CONTRIBUTORS Melissa H. Le
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Notes on Contributors 281 Research
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284 Index Breakaway force (see Fran
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286 Index movement, 55, 80, 84, 90,
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288 Index 198, 204, 205, 208, 210,
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290 Index Microphone, 15, 186, 224,
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292 Index Speech intelligibility (S
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Helmet-Mounted Displays: - USAARL - The - U.S. Army

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