ISO 14622:2025 宇宙システム — 構造設計 — 荷重と誘発環境 | ページ 6

3.1

authority

organization, institution or company responsible for the management of the development of a space system (3.13)

3.2

dynamic load

time-dependent load with deterministic or stochastic variation

3.3

environment

combination of thermal and acoustic fields applied on a structure and which, together with loads and pressure, define the mechanical condition of the structure

Note 1 to entry: Humidity and chemical conditions are not considered in this context but should be considered for the choice of material and or surface protection.

Note 2 to entry: Shocks are considered as loads and are thus not part of the environment.

[SOURCE:ISO 10786:2011, 3.18]

3.4

hydrostatic pressure

pressure at a level below the liquid level in the tank, which is induced by the height of liquid above this level, plus quasi-static accelerations

3.5

launch vehicle

vehicle designed to transport payloads to space

[SOURCE:ISO 10795:2019, 3.139, modified — The preferred term"launcher" has been removed.]

3.6

limit load

maximum load, or combination of loads, which a structure or a component in a structural assembly is expected to experience during its service life, in association with the applicable operating environments (3.3)

Note 1 to entry: Load is a generic term for thermal load, pressure, external mechanical load (force, moment, or enforced displacement) or internal mechanical load (residual stress, pretension, or inertial load).

Note 2 to entry: The corresponding stress or strain is called limit stress or limit strain.

[SOURCE:ISO 10785:2011, 3.19, modified — “maximum expected load” has been changed to"maximum load"; note 3 and note 4 to entry have been removed.]

3.7

maximum expected operating pressure

MEOP

highest differential pressure which a pressurized hardware item is expected to experience during its service life and retain its functionality, in association with its applicable operating environments (3.3)

Note 1 to entry: MEOP includes the effects of temperature, peaks, relief pressures, regulator pressure, vehicle acceleration, phase changes, transient pressure (3.17) excursions, and relief valve tolerance.

[SOURCE:ISO 24638:2021, 3.17 modified — The admitted terms have been removed; notes 2 and 3 to entry have been deleted.]

3.8

oscillating load

vibration load

load whose amplitude or direction varies within a frequency range for which the structure dynamic response is significant

3.9

proof pressure

differential pressure applied during the proof test and which is equal to the MEOP (3.7) multiplied by a proof factor

3.10

safety factor

multiplying factor to be applied to limit loads (3.6) and/or maximum expected operating pressure (MEOP) (3.7)

Note 1 to entry: The factor is defined in order to account for the statistical variations of loads and structural strength (3.15) , and inaccuracies in the knowledge of their statistical distributions.

[SOURCE:ISO 24638:2021, 3.8, modified — The preferred term"design safety factor" and the admitted terms have been removed; the words “maximum design pressure (MDP)” have been deleted from the definition; note 1 to entry has been added.]

3.11

service life

period of time (or number of cycles) that starts with item inspection after manufacturing and continues through all testing, handling storage, transportation, launch operations, orbital operations, refurbishment, retesting, re-entry or recovery from orbit, and reuse that can be required or specified for the item

[SOURCE:ISO 10786:2011, 3.56]

3.12

shock load

special type of transient load (3.16) ここで, the load shows significant peaks and the duration of the load is well below the typical response time of the structure

[SOURCE:ISO 10786: 2011, 3.57, modified — Note 1 to entry has been added.]

3.13

space system

crewed or uncrewed vehicle constructed or assembled for the purpose of manoeuvring, moving, operating, or being placed in outer space

Note 1 to entry: A space system can be a launch vehicle a rocket, a payload, a space capsule, a space shuttle, a space station, etc., or any assembled combination thereof.

[SOURCE:ISO 10795:2019, 3.225, modified — The words “manned” and “unmanned” have been replaced with “crewed” and “uncrewed”.]

3.14

static load

quasi-static load

load which is independent of time or is varying slowly with time, so that the dynamic response of the structure is insignificant

[SOURCE:ISO 10786:2011, 3.67, modified — The word “are” has been replaced with “is”; note 1 to entry has been replaced.]

3.15

strength

ability of the structures to withstand the loads (or pressures) and the environment (3.2) encountered during their service life (3.11)

3.16

transient load

dynamic load (3.2) whose magnitude or direction varies with time and for which the dynamic response of the structure is significant

3.17

transient pressure

pressure that varies with time and for which the dynamic response of the structure is significant

3.18

ultimate load

maximum load that the structure is expected to withstand without rupture or collapse, which is expressed as the limit load (3.6) multiplied by the ultimate safety factor, J_U(3.19)

Note 1 to entry: The corresponding stress and/or strain is called ultimate stress and/or strain.

[SOURCE:ISO 10786:2011, 3.69, modified — The term “shall” has been replaced with “is expected to”; the abbreviated term"UL" has been removed; the symbol J_U has been added.]

3.19

ultimate safety factor

J_U

factor applied to the limit load (3.6) in order to derive the ultimate load (3.18)

3.20

yield load

maximum load that the structure is expected to withstand without detrimental deformation, which is expressed as the limit load (3.6) multiplied by the yield safety factor J_Y(3.21)

[SOURCE:ISO 10786:2011, 3.73, modified — The term “shall” has been replaced with “is expected to”; the abbreviated term"YL" has been removed; the symbol J_Y has been added; note 1 to entry has been removed.]

3.21

yield safety factor

J_Y

factor applied to the limit load (3.6) in order to derive the yield load (3.20)