Two-plane balancing is required on a rotor where the length is greater than the diameter. Balancing such a rotor is tricky, since the effects of unbalanced forces on both of the planes need to be considered when determining the corrective action. This paper presents a method of dynamic
balancing for a two-plane rotor without the need to measure the phase angle. The rotor is balanced by measuring vibration amplitudes at the support bearing of the rotor shaft. A new rotor balancing method of amplitude subtraction is used to calculate the balancing weights and their positions
on the rotor. The advantages of this method over the phase angle measurement method are also discussed in the paper.
Vehicle comfort is related to vibrations induced due to surface irregularities and power generation and transmission parts. Long exposure to high vibrations may lead to numbness, stiffness, and pain in the rider’s hand parts such as fingers, shoulders, and neck. It is a challenge to design a good suspension system and vibration absorber which isolates the driver/rider from the induced vibrations. The principle aim of a vehicle’s suspension system/vibration absorber is to isolate the occupant from the induced disturbances, while still allowing the average driver to maintain control over the vehicle and drive it safely. The purpose of the present study is to investigate the vibrations in the motorcycle handlebar and modify the handlebar to reduce the vibration for good ride comfort without affecting its handling. A motorcycle with an under square engine is selected for the experimentation. The under square engine has more stroke length than bore diameter and hence it is more susceptible to generate vibrations. A tuned mass damper system is designed and developed to attenuate handlebar vibrations. To investigate and predict vibration attenuation levels in handlebar at different operating conditions, a proper design of experiments (DOE) is carried. In the DOE, the effects of factors such as motorcycle engine speed, mass on handlebar have been studied on vibrations at the handlebar. The objective of DOE is to develop a robust model that predicts the handlebar vibrations of a motorcycle which is highly desirable when rider exposes to vibration for a long period. The results of the investigation show vibration attenuation from 23 to 66 % at various engine speeds. The effect of the tuned mass damper is substantially visible at higher engine RPM hence proper modification of handlebar becomes essential in case of high revving applications where riders are exposed to high vibrations for longer periods.
Dynamic properties of engine isolators are of significant importance in determining the performance of the isolator and precise prediction of the dynamic behavior at the design stage. Unfortunately, the damping property can not be deduced deterministically from other structural properties because it is highly dependent on dynamic shear properties such as frequency and temperature of material under application. Generally damping properties are determined from experiments conducted on the desired setup. Many times, designers use the damping property data available in literature. Such data may not be recommended for development of predictive models for dynamic behavior. This paper presents a novel method of determination of damping property of the engine isolator. The method is called two-way isolator excitation method (TWIEM). The damping property is determined by excitation of the isolator for active and passive transmissibility. The purpose of this paper is to analyze the vibration isolation by checking the transmissibility ratio for various engine isolators. Sandwiched engine isolators are designed to blend the good properties of different isolation materials to make it more efficient. The experimentation was carried out using three different isolator designs and compared the performance of the isolator on the basis of isolation percentage. Mild steel plates, polymer foam sheets and natural rubber materials are used as Isolator materials. The results show that low damping ratio isolating material is more effective in isolating the vibration source.
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