523.4 VIBRO-ACOUSTIC/TEMPERATURE CONTENTS
| Paragraph | Page | |
|---|---|---|
| 1. | SCOPE | 1 |
| 1.1 | PURPOSE | 1 |
| 1.2 | APPLICATION. | 1 |
| 1.3 | LIMITATIONS | 1 |
| 2. | TAILORING GUIDANCE | 2 |
| 2.1 | SELECTING THE VIBRO-ACOUSTIC/TEMPERATURE METHOD | 2 |
| 2.1.1 | EFFECTS OF THE VIBRO-ACOUSTIC/TEMPERATURE ENVIRONMENT | 2 |
| 2.1.1.1 | RELATIVE IMPORTANCE OF ENVIRONMENTAL STRESSES.. | 2 |
| 2.1.1.2 | OTHER ENVIRONMENTAL STRESSES. | 2 |
| 2.1.1.3 | OPERATION | 2 |
| 2.1.1.4 | TEMPERATURE. | 3 |
| 2.1.1.5 | VIBRATION | 4 |
| 2.1.1.6 | MOISTURE | 5 |
| 2.1.1.7 | SHOCK | 5 |
| 2.1.1.8 | ALTITUDE. | 5 |
| 2.1.1.9 | OTHER ENVIRONMENTS | 5 |
| 2.1.2 | SEQUENCE AMONG OTHER METHODS. | 5 |
| 2.2 | SELECTING A PROCEDURE | 5 |
| 2.3 | DETERMINATION OF TEST LEVELS AND CONDITIONS | 5 |
| 2.4 | TEST ITEM CONFIGURATION.. | 6 |
| 3. | INFORMATION REQUIRED. | 6 |
| 3.1 | PRETEST | 6 |
| 3.2 | DURING TEST | 7 |
| 3.3 | POST-TEST | 7 |
| 4. | TEST PROCESS | 8 |
| 4.1 | TEST FACILITY | 8 |
| 4.1.1 | GENERAL | 8 |
| 4.1.2 | ACOUSTIC CHAMBER | 8 |
| 4.1.2.1 | ACOUSTIC CHAMBER AND ACOUSTIC SOURCE. | 8 |
| 4.1.2.2 | VIBRATION EQUIPMENT | 8 |
| 4.1.3 | TEMPERATURE EQUIPMENT | 8 |
| 4.1.4 | ELECTRICAL STRESS. | 9 |
| 4.2 | INSTRUMENTATION. | 9 |
| 4.3 | CONTROLS.. | 10 |
| 4.3.1 | TEST INTERRUPTION. | 10 |
| 4.3.2 | INTERRUPTION DUE TO TEST FACILITY MALFUNCTION | 10 |
| 4.3.3 | INTERRUPTION DUE TO TEST ITEM OPERATION FAILURE | 11 |
| 4.3.4 | FUNCTIONAL MONITORING | 11 |
| 4.3.5 | VIBRATION MONITORING AND CONTROL | 11 |
| 4.3.6 | TEMPERATURE MONITORING AND CONTROL | 12 |
MIL-STD-810H METHOD
523.4 CONTENTS - Continued
| Paragraph | Page | |
|---|---|---|
| 4.3.7 | HUMIDITY MONITORING | 12 |
| 4.3.8 | POWER MONITORING | 12 |
| 4.4 | DATA ANALYSIS | 12 |
| 4.5 | TEST EXECUTION | 12 |
| 4.5.1 | PREPARATION FOR TEST | 12 |
| 4.5.2 | PRETEST CHECKOUT | 13 |
| 4.5.3 | TEST SETUP AND CYCLE CHECK PROCEDURE | 13 |
| 4.5.4 | PROCEDURE | 14 |
| 5. | ANALYSIS OF RESULTS | 15 |
| 6. | REFERENCE/RELATED DOCUMENTS | 16 |
| 6.1 | REFERENCED DOCUMENTS | 16 |
| 6.2 | RELATED DOCUMENTS | 16 |
METHOD
523.4 ANNEX A VIBRO-ACOUSTIC/TEMPERATURE TEST PROFILE DEVELOPMENT
| 1. | SCOPE | A-1 |
| 1.1 | PURPOSE | A-1 |
| 1.2 | APPLICATION | A-1 |
| 2. | DEVELOPMENT. | A-1 |
| 2.1 | BACKGROUND. | A-1 |
| 2.2 | GENERAL | A-1 |
| 2.3 | MISSION CHARACTERIZATION | A-1 |
| 2.4 | MISSION ANALYSIS | A-2 |
| 2.4.1 | MISSION TEMPERATURES. | A-3 |
| 2.4.2 | MISSION VIBRATION. | A-4 |
| 2.4.3 | TEST TEMPERATURE PROFILE | A-5 |
| 2.4.4 | TEST VIBRATION PROFILE | A-7 |
| 2.4.5 | OPERATIONAL DUTY CYCLE | A-7 |
| 3. | TEST CONFIGURATION. | A-7 |
ANNEX A FIGURES
| FIGURE 523.4A-1. TYPICAL AIRCRAFT OPERATIONAL MISSION PROFILE | A-2 |
| FIGURE 523.4A-2. TEMPERATURE PROFILE FOR A SINGLE MISSION TYPE | A-3 |
| FIGURE 523.4A-3. CLIMATIC SET OF TEMPERATURE PROFILES FOR COMPOSITE MISSION | A-4 |
| FIGURE 523.4A-4. SELECTION OF EQUI-PROBABLE TEMPERATURES FROM THE CUMULATIVE DISTRIBUTION OF CLIMATIC TEMPERATURES | A-6 |
| FIGURE 523.4A-5. CLIMATIC SET PLAN SHOWING OFFSET SEQUENCES | A-6 |
| FIGURE 523.4A-6. DYNAMIC PRESSURE, Q, PROFILE FOR COMPOSITE MISSION | A-7 |
| FIGURE 523.4A-7. TYPICAL ARRANGEMENT OF TEST APPARATUS | A-8 |
MIL-STD-810H METHOD
523.4 CONTENTS - Continued Paragraph Page
A TABLES
| TABLE 523.4A-I. | RELATIVE FREQUENCY OF OCCURRENCE OF MISSION TYPES | A-1 |
| TABLE 523.4A-II. | MISSION PHASE ANALYSIS (FIGHTER B, STRIKE MISSION) | A-2 |
| TABLE 523.4A-III. | TEMPERATURE OFFSETS | A-6 |
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MIL-STD-810H METHOD 523.4
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MIL-STD-810H
METHOD 523.4
METHOD
523.4 VIBRO-ACOUSTIC/TEMPERATURE
NOTE: Tailoring is essential. Select methods, procedures, and parameter levels based on the tailoring process described in Part One, paragraph 4.2.2, and Annex C. Apply the general guidelines for laboratory test methods described in Part One, paragraph 5 of this standard.