Automobile muffler principle function and troubleshooting

Automobile muffler is car commonly used components,which is beneficial to reduce the car driving in the process of noise pollution,is the use of sound wave superposition interference principle made from. Common faults and eliminate the principle of automobile muffler The principle of automobile muffler is the exhaust pipe is made up of two different lengths of pipe structure,the two pipe to separate intersection again. Since the two pipe length difference value equal to the car from the sound of half of the wavelength,make two columns of sound in a superposition interference occurs when the offset each other and weaken the intensity of sound,sound,and so to reduce the effect of noise. Impedance muffler is mainly using porous sound absorbing material to reduce the noise. The sound absorbing material fixed in the flow channel on the wall or according to certain ways in the pipeline arrangement,constitutes the impedance muffler. When an acoustic wave enters impedance muffler,part of the acoustic energy in the porous material porosity of friction and converted into heat energy dissipation off,make through the muffler acoustic abate. As electrical impedance muffler on pure resistance circuit,sound absorbing material similar to the resistance. Therefore,people put the silencer called impedance muffler. Impedance muffler attenuation effect of treacherous,low frequency noise elimination effect is poorer. Resistance muffler is by mutation interface tube and room combination and become,like is a acoustic filters,and electrical filter similar,each with a tube of small room is one of the filter mesh,pipe to the air quality is equivalent to the electrical resistance and inductance,known as the sound quality and resistance. The little room in the air volume is equivalent to the electrical capacitance,called acoustic compliance. And electrical filter similar,each with a tube of small room has its own inherent frequency. When contains various frequency components of an acoustic wave enters the first short pipe,only in the first mesh inherent frequency nearby some frequency acoustic can through the mesh to a second short nozzle,and some other frequency acoustic is impossible through the mesh. Only in a small chamber bounces back and forth,therefore,we call this kind of acoustic have filtering function structure for acoustic filter. Select the appropriate pipe and room for combination. You can filter out some frequency components of noise,so as to achieve the purpose of noise elimination. Resistance muffler is applicable to eliminate,low frequency noise. The impedance structure and resistance structure according to certain way together,they form aimpedance compound muffler. Micro perforated plate muffler is generally less than 1 mm in thickness of pure metal sheet production,in the sheet with less than 1 mm diameter of drill hole,hole rate is 1% one 3%. Choose a different perforation ratio and the thickness of different cavity depth,can control the spectrum of the muffler performance,in the need of the frequency range for good silencing effect. Pore structure of the muffler is a closed straight pipe,tube wall drilling has a lot of holes. The principle of holes muffler is jet noise based on the spectrum,if keeping the total area of the nozzle and the same with many small nozzle to replace,when air flow through the holes,the jet noise spectrum will move to the high frequency or ultra-high frequency,so that in the spectrum of the sound components significantly launch x431 v plus,thus to reduce the interference and damage. The basic principle of active muffler is in the original sound field,the use of electronic equipment to produce a with the original sound pressure equal and opposite phase,the sound waves in the certain scope with the original sound field phase offset. The silencer is a set of apparatus,mainly by the microphone,amplifier,phase shifter,power amplifier and speakers,etc.Article with sand grinding contact and adjust the clearance to mm,the engine start after operation,but when the automobile driving about forty kilometers,muffler appeared shooting phenomenon. Fault check and eliminate: according to the above phenomenon used for shooting reasons for the careful analysis,in order to find out the fault,check the firing order,distributor without electricity contact arm spring force,ignition timing,spark plugs,etc. No problem found. To continue to check the carburetor air filter,valve clearance also didn't results. To start the engine and running normal,but not an how long and the recurrence. Stop check again distributor part. Through the disassembly and check carefully,and finally found breaker contact arm to low voltage terminal copper glue line in the corner jackknifing,only a few thin wire connected. Replace broken copper glue line,fault phenomenon disappear. Failure analysis: when distributor low wire part of wire broken,conductor cross-sectional area is reduced,so that the primary circuit resistance increases,the current in the circuit is reduced,cause ignition coil from the lack of high pressure TPMS. When the engine temperature low,although some difficult start,but after starting the engine can normal operation. Ready for motor temperature,ignition coil temperature increase,resistance and increases with temperature increasing,? So ignition coil produce high voltage will be more shortage,high voltage spark more weak,even off the fire. From time to time due to the broken fire,in the cylinder unlighted combustible mixture into silencing,in the muffler inflation,meet the exhaust Mars that happen deflagration,for the performance of the muffler shooting.
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