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ISO 28927-6:2009 — Hand-held portable tools — Vibration test for rammers
Laboratory method for measuring vibration from hand-held rammers for soil compaction | Engineering guide
Introduction to ISO 28927-6
ISO 28927-6:2009 specifies a laboratory method for measuring hand-transmitted vibration emission at the handles of hand-held power-driven rammers. This standard replaces ISO 8662-9:1994 and applies to machines driven pneumatically, hydraulically, or by internal combustion engines, used for compacting soil, asphalt, and other granular materials in construction and civil engineering applications.
Rammers produce high-impact, low-frequency vibration that is particularly challenging to measure accurately. The standard addresses this with specific instrumentation requirements including mechanical filters and appropriate integration times.
Key Technical Requirements
Measurement Methodology
The standard requires vibration measurement in three orthogonal axes at the handle positions. The prescribed transducer location follows the EN 60745 principle: between the thumb and index finger. Due to the high-impact nature of rammer operation, mechanical filters are strongly recommended to protect the transducers and ensure valid readings.
| Parameter | Requirement | Notes |
|---|---|---|
| Measurement axes | 3 orthogonal (x, y, z) | Simultaneous measurement |
| Frequency weighting | Per ISO 5349-1 | Hand-arm vibration filter |
| Integration time | ≥ 8 s | During stable operation |
| Operators | 3 skilled operators | Each performs 5 test runs |
| Mechanical filters | Strongly recommended | Protect transducers |
Rammers generate extremely high vibration magnitudes. Operators must follow proper safety procedures, including wearing appropriate anti-vibration gloves and hearing protection during testing.
Engineering Design Insights
The test conditions for rammers simulate real-world compaction work. The machine must be tested under actual operating conditions on a standardized test bed of compactible material. The feed force and operating parameters must follow the manufacturer’s specifications while ensuring stable, reproducible operation.
For internal combustion engine driven rammers, particular attention must be paid to engine speed stability during measurements. The vibration characteristics of rammers are strongly influenced by the soil or material being compacted, making standardized test conditions essential for comparability.
The standard’s three-operator, five-run protocol (15 total measurements per machine) provides statistically robust vibration declarations even for high-variability machines like rammers.
Frequently Asked Questions
Q: Why are mechanical filters important for rammer testing?
A: Rammers produce high-amplitude shock pulses that can overload or damage piezoelectric accelerometers. Mechanical filters attenuate these shocks while preserving the vibration signal in the frequency range of interest.
A: Rammers produce high-amplitude shock pulses that can overload or damage piezoelectric accelerometers. Mechanical filters attenuate these shocks while preserving the vibration signal in the frequency range of interest.
Q: What power sources are covered?
A: Pneumatic, hydraulic, and internal combustion engine driven rammers are all within the scope of this standard.
A: Pneumatic, hydraulic, and internal combustion engine driven rammers are all within the scope of this standard.
Q: Can this standard be used for all types of compactors?
A: This part specifically addresses rammers. Other compaction equipment like vibratory plates or rollers may be covered by different standards.
A: This part specifically addresses rammers. Other compaction equipment like vibratory plates or rollers may be covered by different standards.
