Project03
Forage harvester RSM 1401
Development of engineering solutions aimed at noise level reduction in the combine coach.
Customer
OOO "Combine Plant Rostselmash Ltd."
Historical background:
The RSM 1401 harvester is a modern highly efficient forage harvester manufactured by “Rostselmash”. Its rated capacity is 140 tons of soilage crops per hour at a working speed of 18 kmph. This machinery is used by large agricultural companies and farms and fully meets the requirements for foraging. The harvester can provide a stock breeding complex with a large amount of high-quality stock feed within a short time.
Problem
Noise level inside the combine coach fails to meet the safety requirements
Tasks
-
01
To analyze vibro-acoustic characteristics of the harvester in different operating modes.
-
02
To search for the weak points (in terms of acoustics) inside the coach and to localize the sources and ways of noise penetration.
-
03
To develop a solution for noise reduction, and to introduce it into the prototype sample.
Research
Main sources of noise
Solutions:
-
01
To reduce the general noise and vibration level in the cabin we
set a 1 mm-thick metal acoustic panel with the materials Bimast Bomb and Isoton LM 30 under the cabin floor.
Materials used
-
Bimast Bomb
Vibration absorbing material
More HideA bitumen and mastic-based self-adhesive vibration absorbing material.
Physical and mechanical characteristics of the material:
- Mechanical loss factor at 20 °C:
- 0.4
- Operating temperature range:
- -40 to +80 °С, Short-term action of high temperatures up to +150 °С is acceptable.
- Mechanical loss factor at 10 °С:
- 0.6 c.u
- Material-to-surface bond strength:
- min 5 N/cm
-
Isoton LM 30
Sound absorbing material
More HideConsists of a sound-transparent metalized PETP film as a facing layer, elastic polyurethane foam and an adhesive mounting layer covered with anti-adhesive film.
Physical and mechanical characteristics of the material:
- Operating temperature range:
- -45 to 100 °С
- Sound absorption within the temperature range 600 - 4000 Hz:
- 0.1 - 0.65 units
- Material-to-surface bond strength:
- min 4 N/cm
-
-
02
To reduce the engine noise and vibration level we
set a panel with the materials Bimast Bomb and Melaton F 40 K on the engine cowl, and treated the cowl’s sides with Bimast Bomb.
Materials used
-
Melaton 2 TK
Sound absorbing material
More HideA foamed material made from melamine resin with 3D open-cell structure. The material is covered with nonflammable water-resistant fabric.
Physical and mechanical characteristics of the material:
- Thermal conductivity at a temperature of 25 °С:
- 0.036W/mK
- Flammability class:
- Self-extinguishing
- Smoke generation ability (Dt=2; Dt=4; Dmax when burning and smoldering)
- max: 200
- Facing layer-to-foamed layer bond strength:
- 0.6 N/cm
- Anti-adhesive film-to-adhesive layer bond strength:
- 0.01-0.1 N/cm
-
Bimast Bomb
Vibration absorbing material
More HideA bitumen and mastic-based self-adhesive vibration absorbing material.
Physical and mechanical characteristics of the material:
- Mechanical loss factor at 20 °C:
- 0.4
- Operating temperature range:
- -40 to +80 °С, Short-term action of high temperatures up to +150 °С is acceptable.
- Mechanical loss factor at 10 °С:
- 0.6 c.u
- Material-to-surface bond strength:
- min 5 N/cm
-
-
03
To improve the sound insulation of the cabin we
replaced the 5 mm-thick rear window with a double glazing unit 4x4x6 mm
-
04
To reduce vibration from the accelerator and the engine we
replaced the standard 2 mm-thick vibro-deadening material with Bimast Bomb.
Materials used
-
Bimast Bomb
Vibration absorbing material
More HideA bitumen and mastic-based self-adhesive vibration absorbing material.
Physical and mechanical characteristics of the material:
- Mechanical loss factor at 20 °C:
- 0.4
- Operating temperature range:
- -40 to +80 °С, Short-term action of high temperatures up to +150 °С is acceptable.
- Mechanical loss factor at 10 °С:
- 0.6 c.u
- Material-to-surface bond strength:
- min 5 N/cm
-
-
05
Installation of a sound barrier at the feeder inlet
We installed a sound barrier with the materials Bimast Bomb and Melaton F 40 K at the feeder inlet.
Materials used
-
Melaton 2 TK
Sound absorbing material
More HideA foamed material made from melamine resin with 3D open-cell structure. The material is covered with nonflammable water-resistant fabric.
Physical and mechanical characteristics of the material:
- Thermal conductivity at a temperature of 25 °С:
- 0.036W/mK
- Flammability class:
- Self-extinguishing
- Smoke generation ability (Dt=2; Dt=4; Dmax when burning and smoldering)
- max: 200
- Facing layer-to-foamed layer bond strength:
- 0.6 N/cm
- Anti-adhesive film-to-adhesive layer bond strength:
- 0.01-0.1 N/cm
-
Bimast Bomb
Vibration absorbing material
More HideA bitumen and mastic-based self-adhesive vibration absorbing material.
Physical and mechanical characteristics of the material:
- Mechanical loss factor at 20 °C:
- 0.4
- Operating temperature range:
- -40 to +80 °С, Short-term action of high temperatures up to +150 °С is acceptable.
- Mechanical loss factor at 10 °С:
- 0.6 c.u
- Material-to-surface bond strength:
- min 5 N/cm
-
Introduction
Result:
- General noise level caused by the working engine only reduced by 3,3 dB
- General noise level caused by the working drum and the reaper decreased by 5,5 dB
Owing to this reduction of noise, the harvester achieved the statutory benchmark of 80 dB with the engine working at 2000 rpm and with the working engine and the drum at 1195 rpm.
