Frequency, Wavelength and Speed

waves

Understanding frequency, wavelength and speed is fundamental to everything around us. From noise and vibration, chatter on a lathe tool to the light we experience from objects. Waves move energy from one place to another without any accompanying matter. Sound waves, ocean waves and electromagnetic waves are some of the examples; other, more complicated types … Read more

Room Acoustics

room acoustics

Room acoustics is a huge subject in it’s own right, but I wanted to share some basics. A basic level of knowledge will help if you are trying to reduce the noise levels in a workshop or position your speakers in the optimal location. The trend of creating large open living areas that are decluttered … Read more

Acoustic Chambers and Rooms

acoustic rooms and chambers

There are a number of different types of acoustic chambers and rooms.┬áSome are defined very specifically and others more loosely. These rooms are mainly used by noise and vibration measurement specialists. Acoustic chambers and rooms are quite specialist rooms to design, build, operate and maintain. Often the design of these rooms will be done by … Read more

Vibration Damping

CAD of a shock absorber and over type spring

Vibration damping is the dissipation of energy in a system, either through time or distance. Damping will reduce the vibration amplitude. Hence reducing the radiated sound or reducing the vibration and hence improving the tactile quality. The term is generally applied to the vibration of a structure owing to the internal dissipative properties of the … Read more

Mill Stiffness = Top Finish

end mill finish with SX2.7 and bracket

Mill Stiffness = Top Finish is a fundamental equation for any milling machine big or small. Increasing stiffness reduces vibration. I increased the column to base connection stiffness with this mild steel plate. The fundamental design principle was to add a thick plate and increase the bending stiffness of the plate using beams. So the … Read more

Engine Mount Brackets

crankcase and engine bracket

When we’re mounting an engine either on isolating mounts or solid into a structure it is really important to consider the design of the brackets. If these brackets have any low frequency stiffness concerns then these are likely to be excited by the engine at some point through it’s speed range. There are ten fundamental … Read more