1. An automatic generating method for enveloping surface with objectarx 2. A practical software based on kbe for rendering wheel hop into enveloping surface 3. Measurement of airborne noise emitted by machines ; enveloping surface method ; cranes 4. Measurement of airborne noise emitted by machines ; enveloping surface method , hydraulic pumps 5. Measurement of airborne noise emitted by machines ; enveloping surface method , construction equipment 6. Measurement of airborne noise emitted by machines ; enveloping surface method ; motion picture cameras 7. Measurement of noise emitted by machines ; airborne noise emission ; enveloping surface method ; chimneys 8. Measurement of noise emitted by machines ; airborne noise emission ; enveloping surface method ; flares 9. Measurement of airborne noise emitted by machines ; enveloping surface method , comminuting machines 10. Measurement of noise emitted by machines ; airborne noise measurement , enveloping surface method ; valves