Your rods for pistons 1 and 3 and probably backwards
An engine that vibrates at 3000 RPM has an issue with balance. The harmonic balancer or the crankshaft can become out of alignment.
If the problem was not there before the repair then I would be looking at the repair itself. Could the pistons be installed backwards? Was it the correct crankshaft without a doubt? Did you match the casting numbers? Balancers only give a problem if the rubber between the 2 pieces comes out.
Before looking at engine possibilities, check the tires, suspension components, and universal joints. If all is well, check the harmonic balancer to see if the elastomer has worn out.
In a santoor, the strings are the part that vibrates when struck with a mallet. The vibrations produce sound, and the strings are arranged in courses that are typically grouped in threes, creating a rich, harmonic tone.
first harmonic
The fundamental = 1st harmonic is not an overtone!Fundamental frequency = 1st harmonic = 528 Hz.2nd harmonic = 1st overtone = 1056 HzLook at the link: "Calculations of Harmonics from FundamentalFrequency".
When a particle of a medium vibrates back and forth, it is called simple harmonic motion. This type of vibration occurs in a periodic manner around a central equilibrium position.
Second Harmonic
not really sure could be fly wheel or counter balancer out of alignment (broken keyway)
The overtone with a frequency of 1,056 Hz is the second harmonic, which is double the fundamental frequency of 528 Hz. This overtone occurs when the string vibrates in two equal parts, creating a node at the center and a full waveform on each side.
Fundamental frequency = 1st harmonic = 256 Hz 2nd harmonic = 1st overtone = 512 Hz 3rd harmonic = 2nd overtone = 768 Hz. Look at the link: "Calculations of Harmonics from Fundamental Frequency".
In physics the first harmonic is the fundamental. In physics is the second harmonic the first overtone. In physics is the third harmonic the second overtone. In physics is the fourth harmonic the third overtone. Even-numbered harmonics are odd-numbered overtones. Odd-numbered harmonics are even-numbered overtones.