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The first efforts to use ultrasonic testing to detect flaws in solid material occurred in the 1930s. On May 27, 1940, U.S. researcher Dr. Floyd Firestone of the University of Michigan applies for a U.S. invention patent for the first practical ultrasonic testing method. The patent is granted on April 21, 1942 as U.S. Patent No. 2,280,226, titled "Flaw Detecting Device and Measuring Instrument". Extracts from the first two paragraphs of the patent for this entirely new nondestructive testing method succinctly describe the basics of such ultrasonic testing. "My invention pertains to a device for detecting the presence of inhomogeneities of density or elasticity in materials. For instance if a casting has a hole or a crack within it, my device allows the presence of the flaw to be detected and its position located, even though the flaw lies entirely within the casting and no portion of it extends out to the surface. ... The general principle of my device consists of sending high frequency vibrations into the part to be inspected, and the determination of the time intervals of arrival of the direct and reflected vibrations at one or more stations on the surface of the part."
When I volume up the speaker its has a bit cracking sounds. But I don't sure that it is Left or Right one. But its really a little bit crack if you don't raise it until the limit they won't any cracking sound. How can I check that my speaker are still good or not
I just wanted to thank you! I never would have thought that going into the sound preferences and changing the alert sound would fix it, but sure enough it did. I play around with audio setups all the time due to music software and didn't think I changed it to the blow sound effect, but I must have. I may have brought it into apple for a repair. It's a desktop so I'm not a fan of moving it anywhere. Thanks again!!!!
Same problem but on left side, I think the speaker foam on left side has been damaged, that's why lots of crackling noises on left speaker of my MacBook Pro Mid-2015 Retina display. I just selected system preference - sound - balance (to reduce crackling on left, scroll the pointer on bar to right side and vice versa) but this is just temporary, In my opinion , I need to change the internal speaker,
High frequency sound waves are very directional, and they will travel through a medium (like a piece of steel or plastic) until they encounter a boundary with another medium (like air), at which point they reflect back to their source. By analyzing these reflections it is possible to measure the thickness of a test piece, or find evidence of cracks or other hidden internal flaws.
Noise in your car audio system can be caused by more than one issue. Noise can be static, whine, hiss, distortion, or other sound issues.\nFollow the steps below to locate and fix the source of the noise:\nMake sure to check ground wires.\nCheck the ground wires to all of the components in your system. This may include the receiver (head unit), external amplifier, equalizers, or other components. All components in your audio system should have a ground wire attached firmly to bare metal on the car. In addition, the ground wire should be as short as possible. Long ground wires can pick up noise that can be heard in the audio system. If you have extended the ground wire, make sure the splice is firmly connected and you may need to use a larger gauge (thicker) ground wire.\nPerform the steps below if you have external amplifier:Turn on your audio system without the car running. Put in a CD and set the CD player on pause, or insert a blank tape if you have a cassette deck. Turn up the volume to a normal listing level. If you hear a hissing sound, turn down the gain on the amplifier and turn up the volume on the receiver. Adjust these two settings to minimize the hiss.Make sure the patch cables between the amplifier and the receiver are not running near other power wires (including the wire providing power to the amplifier). If necessary, reroute the cables away from other wires. Make sure you are using high-quality patch cables.On year 2000 model and newer car stereo receivers, verify that the amplifier is connected to the AMP REMOTE lead on the car stereo, if available.\nIf whine or clicking noise is heard.\nIf you hear a whine or clicking noise that changes with the speed of the engine you may have a problem with the electrical system of the car. This can be caused by old spark plugs and wires, ignition system components, or by a problem with the alternator. If your car has not been tuned up recently your mechanic may be able to resolve the issue by checking these components and systems. If these items are checked and are not the issue then you may need to install a noise suppressor to help eliminate the noise.\nNoise is heard only when listening to the radio.\nIf the noise is only heard when listening to the radio, it may be coming through the antenna. Remove the antenna wire from the receiver. If the noise goes away you may need to install an antenna noise suppressor that plugs in between your antenna and the receiver.\nNoise is heard from other sources.\nTurn other components in the car on and off to see if the noise changes or goes away. Other s