ISSN: 1693-6930
TELKOMNIKA Vol. 11, No. 2, June 2013: 313 – 320
316 recording the engine, Appendix table experimental data for measuring the mean value, wherein
the fuel consumption rate is a combination of the output power and the fuel consumption of 20 seconds and calculated. Before determining of the learning sample, some strange data may be
excluded artificially. Generally if the muffler noise increase the fuel consumption will increase.
2.4. The diesel exhausts muffler aerodynamic performance evaluation
The evaluation of the performance of the diesel exhausts muffler performance and aerodynamic performance evaluation. In addition, the product design should take into account
the size of diesel engines machine installation also as an evaluation of the structural performance, maintenance requirements, life.
Examine exhaust muffler for internal combustion engine performance, general power loss than to evaluate. The muffler of the power loss ratio, is after the internal combustion engine in
the calibration conditions, the muffler is not used, power and use muffler device power difference and not a percentage of the muffler when the power of, i.e., measuring muffler power
loss than when should be carried out in accordance with the relevant provisions of the internal combustion engine bench test. In addition, it should be noted that before and after the change
the exhaust muffler is mounted as far as possible to maintain the environmental conditions of the test, the state of the machine is relatively stable, so as to avoid the error. Exhaust muffler
can also be used to evaluate the dynamic performance of the pressure loss. The pressure loss is due to the friction of the the muffler internal combustion surface and the airflow, the piping
elbow, the piercing element, the pipe sections mutations result in the loss of mechanical properties, generally indicated with the full pressure of the inlet and outlet of the muffler to the
pressure loss. If the pressure loss increase then the power of the internal combustion engine muffler increase.
The muffler noise elimination performance reflected in the size of the amount of noise elimination, the insertion loss method to evaluate that:
- dB
L L
L
phou p
IL 前
1 Where
pfront
L
—before the installation of muffler in the same point of the sound pressure level
pafter
L
—after the installation of muffler in the same point of the sound pressure level
3. BP artificial neural network design and training
