Dynamic balancing without static balancing

  • Thread starter Thread starter hazar
  • Start date Start date
  • Tags Tags
    Dynamic Static
AI Thread Summary
Dynamic balancing requires the central principal axis of inertia to align with the axis of rotation, which cannot occur if the center of gravity is outside this axis. The discussion emphasizes that static balancing, where the center of gravity is aligned with the axis of rotation, is a prerequisite for achieving dynamic balance. Experiences with car tires illustrate that while dynamic balancing can mitigate issues like wobbling at certain speeds, static balancing alone may not suffice. Ultimately, the consensus is that dynamic balancing cannot exist independently of static balancing. Thus, both forms of balancing are interconnected in practical applications.
hazar
Messages
4
Reaction score
0
static balancing is when the center of gravity is in the axis of rotation.

dynamic balancing is when the central principal axis of inertia is parallel and coincident with the axis of rotation.

my question is, even if its theoretically, can you have dynamic balancing without static balancing?

If you have the center of gravity outside the axis of rotation but still have the central principal axis of rotation on and parallel with the axis of rotation, do you not have dynamic without static balancing?
 
Engineering news on Phys.org
From experience with car tires, it seems that dynamic balancing is always better. If you statically balance the tires then at some certain speeds you'll get a wobbly feeling due to hitting the resonant frequency.
 
jedishrfu said:
From experience with car tires, it seems that dynamic balancing is always better. If you statically balance the tires then at some certain speeds you'll get a wobbly feeling due to hitting the resonant frequency.

Thanks but still doesn't answer my question in a way.

Can you have dynamic without static
 
The principal axes of inertia pass through the center of mass, by definition.

So the answer to your original question is no, you can't have the principal axis along the axis of rotation but the center of mass somewhere else.
 

Thread 'Race car suspension Class'

Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Thread 'Cantilever help'

I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
View full post »

Similar threads

Low pressure, high velocity flow vs static pressure
Replies
5
Views
2K
Torque to rotate a object on the ground about its own axis
Replies
2
Views
3K
Polplan in STATICS (instantaneous center of rotation?)
Replies
12
Views
2K
Automotive Steering Force, Determining the Lever Arm
Replies
9
Views
1K
Ball bearing cantilever system with maximal moment of inertia
Replies
16
Views
2K
Can You Make a Frictionless Loop Turn?
Replies
8
Views
1K
Four-Bar Parallel Linkage Pendulum
2
Replies
62
Views
5K
Analyzing the Mechanics of a Wobble Plate in a Cranked Axle Mechanism
Replies
10
Views
3K
Fatigue of a Rotor: Predicting Life Expectancy with Variable Cyclic Stresses
Replies
2
Views
2K
Toy Problem to Understand Products of Inertia?
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top