Tyre manufacturers use uniformity measurement machines to control % of the tyres in regards to radial and lateral forces, conicity and ply. Tire uniformity. Tire Uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers.Tire uniformity parameters · Conicity · Tire uniformity · Other types of uniformity. Why Uniformity..· Vehicle manufacturers are far ahead of us in development· They find out vehicles misbehaves due to tire abnormality·.
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The automotive industry conducts quality or incoming goods inspection with the tyre uniformity measuring machines.
Those parameters can have a negative impact on the behaviour of the car. The impact can be on vibration as well as the steering wheel. tyre uniformity
Tyre Uniformity Measuring Machines
Furthermore tyres will wear down faster if the conicity is too high. A good overall uniformity of the tyres is very tyre uniformity for the car manufacturers.
Faster tyre uniformity irregular tyre wear Increased wear of other vehicle parts Types And Effects Of Non-Uniformity of Mass A static imbalance involves an irregular distribution of mass in the tyre.
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Tyre uniformity, this involves a positive mass placed precisely on the axis of symmetry on the tyre tread. This would result in radial vibrations.
tyre uniformity In reality, however, dynamic moment and static imbalance often occur together. This produces dynamic imbalance, which can often be compensated for by balancing out the wheels.
If this imbalance is not compensated, or the non-uniformity of tyres and rims means the imbalance is too large to handle this way, then additional symptoms may occur. These include the likes of: Vibration and noise within the vehicle Unnatural read wear and a shortening of the tyre lifetime Increased fuel consumption Faster wear tyre uniformity tear on the suspension system The Main Reasons For Tyre uniformity Of Mass There are many reasons why non-uniformity of mass may be occurring.
The tangential axis is the one in the direction of the tire travel. Radial Force Variation[ edit ] Main article: Radial force variation In so far as the radial force is the one acting upward to support the vehicle, radial force variation describes the change in this force as the tire rotates under load.
As the tire rotates and spring elements with different spring constants enter and exit the contact area, the force will change.
Tyre Uniformity Measuring Machines | Hofmann Maschinen- und Anlagenbau GmbH
Consider a tire supporting a 1, pound load running on a perfectly smooth roadway. It tyre uniformity be typical for the force to vary up and down from this value.
A variation between pounds and pounds would be characterized as an 8-pound radial force variation Tyre uniformity.
RFV can be expressed as tyre uniformity peak-to-peak value, which is the maximum minus minimum value, or any harmonic value as described below.
Some tire manufactures mark the sidewall with a red dot to indicate the location of maximal tyre uniformity force and runout, the high spot. A yellow dot indicates the point of least weight.
Tyre damage: non-uniformity of tyres
To compensate for this variation, tires are supposed to be tyre uniformity with the red dot near the valve stem, assuming the valve stem is at the low point, or with the yellow dot near the valve stem, assuming the valve stem is at tyre uniformity heavy point.
This waveform can be expressed according to its harmonics by applying Fourier Transform FT. FT permits one to parameterize various aspects of the tire dynamic behavior. The first harmonic, expressed as RF1H radial force first harmonic describes the force variation magnitude that exerts a pulse into the vehicle one time for each rotation.
RF2H expresses the magnitude of the radial force that exerts a pulse twice per revolution, and so on. Often, these harmonics have known causes, and can be used to diagnose production problems. For example, a tire mold installed with 8 bolts may thermally tyre uniformity as to induce an eighth harmonic, so the presence of a high RF8H would point to a mold bolting problem.
High harmonics are less problematic because the rotating speed of the tire at highway speeds times the harmonic value makes disturbances at such high frequencies that they are damped or overcome by other vehicle dynamic tyre uniformity.