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2. Ping (golf) - Wikipedia

   en.wikipedia.org/wiki/Ping_(golf)

   Ping, Inc. (stylized as PING) is an American sports equipment manufacturing company based in Phoenix, Arizona. It focuses on golf equipment , producing golf clubs and golf bags . The company was founded by Karsten Solheim , following a career as an engineer at the General Electric company.

3. Campbell diagram - Wikipedia

   en.wikipedia.org/wiki/Campbell_diagram

   Another critical speed at mode 4 is observed at 7810 rpm (130 Hz) in dangerous vicinity of nominal shaft speed, but it has 30% damping - enough to safely ignore it. Analytically computed values of eigenfrequencies as a function of the shaft's rotation speed. This case is also called "whirl speed map". [4] Such a chart can be used in turbine design.

4. Golf club - Wikipedia

   en.wikipedia.org/wiki/Golf_club

   A golf club is a club used to hit a golf ball in a game of golf.Each club is composed of a shaft with a grip and a club head. Woods are mainly used for long-distance fairway or tee shots; irons, the most versatile class, are used for a variety of shots; hybrids that combine design elements of woods and irons are becoming increasingly popular; putters are used mainly on the green to roll the ...

5. Dunkerley's method - Wikipedia

   en.wikipedia.org/wiki/Dunkerley's_Method

   When an element of mass is offset from the axis of rotation, centrifugal force will tend to pull the mass outward. The elastic properties of the shaft will act to restore the “straightness”. If the frequency of rotation is equal to one of the resonant frequencies of the shaft, whirling will occur. In order to save the machine from failure ...

6. Shaft alignment - Wikipedia

   en.wikipedia.org/wiki/Shaft_alignment

   Shaft alignment is the process of aligning two or more shafts with each other to within a tolerated margin. The resulting fault if alignment is not achieved within the demanded specifications is shaft misalignment, which may be offset or angular. Faults can lead to premature wear and damage to systems.

7. Balance shaft - Wikipedia

   en.wikipedia.org/wiki/Balance_shaft

   Balance shafts are used in piston engines to reduce vibration by cancelling out unbalanced dynamic forces. The counter balance shafts have eccentric weights and rotate in opposite direction to each other, which generates a net vertical force. The balance shaft was invented and patented by British engineer Frederick W. Lanchester in 1907.

8. Ping test (engineering) - Wikipedia

   en.wikipedia.org/wiki/Ping_test_(engineering)

   A ping test is a physical test to determine the natural frequency of an object or assembly. [1] The test consists of instrumenting the object or assembly with measuring devices and then tapping it with another metallic object (usually a hammer.) The undamped system will then vibrate at its natural frequency.

9. Goodman relation - Wikipedia

   en.wikipedia.org/wiki/Goodman_relation

   Within the branch of materials science known as material failure theory, the Goodman relation (also called a Goodman diagram, a Goodman-Haigh diagram, a Haigh diagram or a Haigh-Soderberg diagram) is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a material. [1]