ISO 15261:2004 振動および衝撃発生システム—用語, 語彙 | ページ 3

1.1

vibration generator system

vibration generator (2.1) and associated equipment necessary for its operation

[SOURCE: ISO 2041:1990, definition 2.91]

Note 1 to entry: The system consists of elements for signal generation, control, amplification, measurement and monitoring, and auxiliary devices depending on the size and complexity of the system. It is designed to provide vibration to a defined accuracy and is used for testing, calibration or other purposes.

1.2

single vibration generator system

vibration generator system that includes only one vibration generator

1.3

multiple vibration generator system

vibration generator system that includes two or more vibration generators where the control system coordinates their motion

1.4

single-axis vibration generator system

vibration generator system generating vibration in a single direction

1.5

multi-axis vibration generator system

vibration generator system generating vibration in two or three directions simultaneously

1.6

vibration test system

vibration generator system designed to be used in environmental and structural testing, but which can also be used on other objects where vibration simulation is required

1.7

vibration calibration system

vibration generator system designed to be used for calibration of devices such as accelerometers

1.8

shock testing machine

device for subjecting a system to controlled and reproducible mechanical shock

[SOURCE: ISO 2041:1990, definition 3.23]

1.8.1

gravity shock generator

shock testing machine that uses gravity as the power source

1.8.2

shock generator

powered shock generator

shock testing machine that is powered by a non-gravitational force

1.8.2.1

gas gun shock generator

shock generator driven by gas expansion energy

1.8.2.2

pyrotechnic shock generator

shock generator driven by an explosive charge

1.9

non-rebounding mode

mode of operation of a shock testing machine where the table does not rebound off the anvil after impact, due to the non-flexible deformation of the pulse-shaping device

1.10

rebounding mode

mode of operation of a shock testing machine where the table rebounds off the anvil, due to the elastic effect of the mechanical pulse-shaping device

1.11

bump testing machine

testing machine repeatedly generating mechanical impulses simulating, for example, vehicle bouncing

1.12

seismic testing machine

testing machine simulating underground disturb­ances such as earthquakes

2.1

vibration machine

vibration generator

machine that is specifically designed for and is capable of generating vibrations and of transferring these vibrations to other structures or devices

[SOURCE: ISO 2041:1990, definition 2.90]

Note 1 to entry: Vibration generators directly transform various types of energy to vibration energy.

2.2

vibration generator with table

vibration generator with an integral table for the purpose of mounting a test object

2.3

vibration generator with force take-off

vibration generator provided with a force take-off device instead of a table to reproduce vibration in a test object or any other unit, for example an auxiliary table

2.4

electrodynamic vibration generator

vibration generator that derives its vibratory force from the interaction of a magnetic field of constant value, and a coil of wire suspended in it which is excited by a suitable alternating current

Note 1 to entry: Adapted from ISO 2041:1990, definition 2.92.

2.5

servohydraulic vibration generator

vibration generator that derives its vibratory force from the application of liquid pressure through a suitable drive arrangement

2.6

pneumatic vibration generator

vibration generator that derives its vibratory force from the application of compressed air pressure through a suitable drive arrangement

2.7

electromagnetic vibration generator

vibration generator which derives its vibratory force from the interaction of electromagnets and magnetic materials

[SOURCE: ISO 2041:1990, definition 2.93]

2.8

piezoelectric vibration generator

vibration generator which has a piezoelectric transducer as its force-generating element

[SOURCE: ISO 2041:1990, definition 2.98]

2.9

magnetostrictive vibration generator

vibration generator which has a magnetostrictive transducer as its force-generating element

[SOURCE: ISO 2041:1990, definition 2.99]

2.10

mechanical vibration generator

vibration generator that converts the energy of rotational mechanical motion into vibration through kinematic mechanisms

2.10.1

direct-drive vibration generator

vibration machine in which the vibration table is forced, by a positive linkage, to undergo a displace­ment amplitude of vibration that remains essentially constant regardless of the load or frequency of operation

[SOURCE: ISO 2041:1990, definition 2.94]

2.10.2

reaction-type vibration generator

unbalanced mass vibration generator

vibration machine in which the forces exciting the vibration are generated by rotating or reciprocating unbalanced masses

[SOURCE: ISO 2041:1990, definition 2.96]

2.11

resonance vibration generator

vibration generator which contains a vibration system which is excited at its resonance frequency

[SOURCE: ISO 2041:1990, definition 2.97]

2.12

moving system

mechanism within a vibration generator or auxiliary table which, when oscillating, induces vibration in the test object

Note 1 to entry: Moving elements of a suspension system are part of the moving system.

2.13

suspension system

part of a vibration generator which provides its mechanical stability and the correct orientation of the moving system in relation to non-moving elements of the vibration generator or auxiliary table

2.14

table

test table

vibration table

part of the moving system of a vibration generator or auxiliary table on which the test object is secured

2.15

auxiliary table

complete and separate mechanical system intended for transmitting vibration generated by one or more vibration generators to the object under test

2.16

control system

system to ensure that the functioning of a vibration generator system conforms to the specified motion

2.16.1

closed-loop control system

automatic control system which uses feedback to maintain a specified motion

2.16.2

open-loop control system

control system where the input is defined and maintained, but the output is not used to control or modify the input as in a closed-loop system

2.17

signal source

device used to generate voltage (current) waveforms that will produce the required results on the vibration table

2.18

loop processor

part of a control system which ensures that the vibration measured at the control point is equal to the required motion

2.19

signal multiplexer

hardware device in a control system which allows several signal input channels to be sent to a single ADC (analog-to-digital converter)

Note 1 to entry: The multiplexer sequentially selects an input signal that is gated to a common output, which in this case is an ADC. In simple terms, it is an electronic switch.

2.20

anti-aliasing filter

analog low-pass filter used before the analog-to-digital conversion to avoid transfer of a signal exceeding half the sampling rate into the low-frequency analysis range

2.21

control software

software program used to specify the behaviour of the vibration test controller

Note 1 to entry: It may include the user interface, the test supervisor function (test duration, level, frequency range, profile) and safety checking functions.

2.22

power amplifier

part of a vibration system which provides the required voltage signal to the vibration generator at the required current

2.23

safety system

auxiliary components and/or documentation that ensure the safety of the operating personnel, vibration generator system and the unit under test

Note 1 to entry: It can include such things as emergency stop switches, warning labels, vibration-monitoring equipment and system interlocks.

2.24

test mass

object that has a specified shape and mass, used for testing a vibration generator or shock testing machine

Note 1 to entry: The test mass should not resonate within the test frequency range or should have a specified rigidity.

2.25

load support system

auxiliary device of a vibration generator system or an auxiliary table which positions the moving system to its mean position to avoid a deflection from the mean position due to the force produced by gravity on the test load

Note 1 to entry: The load support system may be integrated into the vibration generator or external to it. The system may provide automatic position compensation or may be a manually operated system.

2.26

auxiliary component

part of vibration gen­erator system facilitating its operation but not directly involved in the generation of vibration

Note 1 to entry: This can include monitoring and control devices or devices used for system performance monitoring.

2.27

table

part of the shock testing machine on which a test object is secured

2.28

anvil

stationary or flexibly suspended part of the shock testing machine against which the table strikes

2.29

release mechanism

part of the shock testing machine which will initiate the test by allowing the table to move from its initial position

2.30

braking device

part of the shock testing machine which will decelerate the table and/or anvil after impact

2.31

pulse-shaping device

part of the shock testing machine (disposable or reusable) which is placed between the table and anvil and intended to shape the pulse

Note 1 to entry: The type of material and its shape will determinate the deceleration characteristics, i.e. the pulse shape.

3.1

reproduction error

differences between the specified and actual vibration/shock parameters at the control point, obtained during testing of a vibration generator system/shock testing machine

3.2

control point

point on a table or test mass chosen to mount a measuring transducer to measure parameters of vibration, shock, bouncing and earthquakes reproduced by a vibration generator system or a shock/bump/seismic testing machine during testing

3.3

operating axis

direction of excitation force along which the moving system was designed to operate

3.4

load

static load

total mass of the test object and associated devices that secure it to a vibration table

3.5

nominal mass

part of moving system mass corresponding to the arbitrary rigid body mass vibrating along the operating axis of a vibration generator

Note 2 to entry: Nominal mass is often incorrectly called effective mass. The latter is a frequency-response characteristic (see ISO 2041), while the nominal mass does not depend on frequency.

3.6

rated force

minimum value of all excitation forces developed by a vibration generator under different normal working conditions as specified by the manufacturer

3.7

rated sinusoidal force

rated force used to reproduce sinusoidal vibration

3.8

rated broad-band random force

rated force used to reproduce broad-band random vibration

3.9

rated velocity/displacement

maximum value of the accurately reproducible velocity/displacement as specified by the manu­facturer

3.10

distortion

undesired change in the waveform

Note 2 to entry: Harmonic distortion is usually expressed as a percentage.

3.11

uniformity ratio

maximum absolute value of the difference between the acceleration/velocity/displacement at a point on the test table and the acceleration/velocity/displace­ment at the control point, divided by the accelera­tion/velocity/displacement at the control point

Note 1 to entry: Uniformity ratio describes non-plane-parallel movement of the table. The lower the ratio the better is the performance of the table.

Note 2 to entry: It is usually expressed as a percentage.

3.12

transverse motion ratio

maximum ratio of the acceleration/velocity/dis­placement along a direction perpendicular to the operating axis of the vibration generator to the value of the acceleration/velocity/displacement along the direction of the operating axis

Note 1 to entry: It is usually expressed as a percentage.

3.13

resonance frequency of the suspension system

low mechanical resonance frequency of the suspended moving system when oscillating along the operating axis

3.14

resonance frequency of the moving system

mechanical resonance frequency of the moving system

Note 1 to entry: This excludes the resonance frequencies of the suspension system.

3.15

electrical resonance frequency of the moving system

frequency at which the current is in phase with the voltage in the moving coil

3.16

rated travel

maximum allowable travel of the moving system within which the manufacturer guarantees safety and reproduction of the stated parameters of a vibration generator, normally limited by special devices

3.17

force-to-current ratio

ratio of the excitation force to the current in the moving coil

Note 1 to entry: This value varies considerably with frequency.