BS 7285(1990) : 1990
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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METHOD FOR DESCRIBING CHARACTERISTICS OF SERVO-HYDRAULIC TEST EQUIPMENT FOR GENERATING VIBRATION
Hardcopy , PDF
28-02-2017
English
01-01-1990
Committees responsible
National foreword
Method
0. Introduction
1. Scope and field of application
2. References
3. Symbols
4. Units
5. Definitions
6. Characteristics to be supplied by the manufacturer
7. Hydraulic vibration generators
8. Control system
9. Hydraulic power system
10. Hydraulic vibration generator system
Annexes
A. Schematic diagrams
B. Methods for measuring or calculating various
hydraulic vibration generator parameters
C. Selection of test mass
D. Servovalve control device
Tables
1. Values for displacement and acceleration PSDs
2. Vibration generator
3. Control system
4. Hydraulic power system
5. Complete hydraulic vibration generator system
6. Initial mode for a homogeneous test mass
Figures
1. Total distortion at a fixed frequency as a function
of the acceleration
2. Total distortion as a function of the frequency at
maximum acceleration for a given test mass
3. Example of system and single hydraulic stage
servovalve drive requirements
4. Examples of rated sinusoidal characteristics
5. Example of a power spectral density acceleration
(PSDa) profile
6. Schematic diagram of hydraulic test equipment for
generating vibrations
7. Hydraulic linear vibration generator
8. Schematic diagram of a hydraulic power system
9. Boundary area defining values of D and L for
different maximum operating frequencies
10. Typical servovalve control system block diagram
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