A comparative study on engine vibration reduction in ATV quad bikes through dampers with diverse materials and shapes

This study addresses the vital role of engine dampers in reducing vibrations and enhancing ride comfort in quad bikes. Utilizing ANSYS modal analysis and CATIA V5 design, the research aims to optimize damper design by assessing natural frequencies and potential resonance in the cage structure and engine. Through extensive analysis, the study evaluates vibrations transmitted from the engine to the chassis, crucial for understanding and improving overall vehicle performance. Neoprene rubber emerges as the optimal material for vibration dampers, offering superior density, elasticity, stiffness


Introduction
Engine vibrations in all-terrain vehicles (ATVs) pose challenges to both vehicle performance and rider comfort [1].As ATV usage expands across various terrains and applications, addressing these vibrations become paramount to enhance ride quality, minimize component wear, and ensure rider safety [2].One crucial component in mitigating engine vibrations is the damper, designed to absorb and dissipate vibrational energy [3].This paper presents a case study focused on reducing engine vibrations in an ATV quad bike through the implementation of different materials and shapes for the damper [4].The significance of this study lies in its potential to enhance the overall performance and longevity of ATV quad bikes, while simultaneously improving rider comfort [5].By exploring various damper materials and shapes, this research seeks to identify optimal configurations that effectively attenuate engine vibrations across a range of operating conditions [6].The study employs a multidisciplinary approach, drawing on principles from mechanical engineering, materials science, and vehicle dynamics [7].Experimental testing, analytical modelling, and computational simulations are utilized to assess the performance of different damper configurations [8].Through systematic evaluation, this research aims to provide valuable insights into the effectiveness of various damping solutions for ATV quad bikes.Fig. 1 shows the design process used in this paper.

Material selection
The first step in the design process is the selection of appropriate materials for the damper.Various factors such as damping capacity, durability, weight, and cost need to be considered [9].Common materials for dampers include rubber compounds, viscoelastic polymers, and metal alloys.This study evaluates the mechanical properties and damping characteristics of different materials to determine their suitability for ATV damper applications [10].

Damper design
Once suitable materials are identified, the next step involves designing the damper geometry and configuration.Factors such as shape, size, and mounting arrangement are optimized to maximize damping efficiency while minimizing weight and space requirements [11].Computer-aided design (CAD) software is used to model and simulate different damper designs, allowing for virtual testing and optimization before physical prototypes are fabricated [10].

Design optimization
The design optimization process aims to refine the damper configuration to achieve the best possible performance characteristics [7].Iterative simulations and analyses are conducted to identify optimal design parameters such as material properties, geometry, and damping mechanisms.Advanced optimization algorithms and techniques, such as finite element analysis (FEA) and computational fluid dynamics (CFD), are employed to finetune the damper design and improve its effectiveness in reducing engine vibrations [1].

Analysis
Once the optimized damper design is obtained, comprehensive analysis is performed to assess its performance under various operating conditions.Analytical models are developed to predict damping performance, resonance frequencies, and stress distributions within the damper assembly.These analyses provide valuable insights into the behavior of the damper and help validate the design against performance requirements and specifications [3].

Experimental testing
Finally, experimental testing is conducted to validate the performance of the optimized damper design in real-world conditions.Physical prototypes are fabricated using the selected materials and manufacturing processes, and laboratory or field tests are conducted to measure damping efficiency, vibration reduction, and overall system response.
The experimental results are compared with simulation data to verify the accuracy and effectiveness of the optimized damper design [12].By integrating material selection, damper design, optimization, analysis, and experimental testing, this comprehensive approach provides a systematic framework for developing high-performance damping solutions for ATV quad bikes.The findings of this study contribute to advancements in ATV engineering and offer valuable insights for improving vehicle performance and rider comfort in off-road environments [13].

Review of related research
Maddaloni et al. [14] had looked at the fact that passive or active techniques can be used to dampen a building.In order to passively dissipate energy, passive methods rely on specific materials' innate capacity to absorb vibrational energy.Active methods employ sensors and actuators to detect vibrations, activate to stop them in real time, and achieve vibration detection.Additionally, piezoelectric components can be used as sensors and actuators.This review is primarily centered on passive damping materials, which were chosen because of their relative affordability and simplicity of use.Metals, polymers, cements, and their composites are examined as vibration-damping materials.Due of their viscoelasticity, metals and polymers are the dominant materials.However, it is appealing to employ concrete as a structural material to offer some dampening.Additionally, damping efficacy mostly involves mixture utilization in cement, interface design in polymers, and microstructural design in metals.
Das et al. [5] concluded that it is far simpler to distinguish between the reciprocating and rotational inertial forces of the connecting rod using this method than it is to analyze the inertial forces of a single cylinder engine through testing using expensive machinery.According to the modelling results, the primary balance shaft and new crankshaft assembly are made in such a way as to entirely eliminate both the primary reciprocating inertial force and unbalanced rotational inertial force.The average bearing loads become the lowest, and the engine's NVH performance is significantly enhanced because the balanced mechanism is attached to lessen the unbalanced inertial forces.The reciprocating and rotational masses are divided in accordance with the results of the bearing loads simulation.In order to reduce the engine's noise, vibration, and harshness, a new balanced mechanism is built, and the simulation results demonstrate that it is completely balanced in inertial force.
Lundqvist et al. [13] studied the damping coefficient of a single cylinder in terms of the crank angle position that is theoretically determined in this review through a study of relative quasi-static experiment.The technique is based on the formulation of the vibratory energy balance, and it makes use of the measured torsional response of the setup's limiting points.Additionally, a matching motor experiment can be utilized to measure the average damping that is seen when the engine is running.This average damping fits the numerically calculated time-average damping data reasonably well.The linear analysis of reciprocating engine systems with one or more cylinders is carried out using the resulting damping coefficient.Another intriguing outcome of this investigation demonstrates the dampening effect in the crank-connecting rod.The net damping level seen in the reciprocating sections must be less than the dominance of the interacting areas.We can determine the damping coefficient of a vertical single cylinder internal combustion engine even though the proposed method is presented on a reciprocating single-cylinder engine setup because its essential principles apply to various damping elements in the powertrain system.
Zhou and colleagues [15] conducted an experimental study focusing on the mechanical properties of hybrid lead viscoelastic dampers.Their research aimed to enhance the understanding of hybrid lead viscoelastic dampers and explore their potential applications in structural engineering.By investigating the mechanical behavior of these dampers, they provided valuable insights into their effectiveness in mitigating vibrations and enhancing the resilience of structures to dynamic loads.Modhej et al. [16] investigated pre-tensioned shape memory alloy (SMA) cable tests and their application in a novel self-centering viscoelastic damper.Their study delved into innovative damping technologies with potential applications in seismic-resistant design.By exploring the performance of pre-tensioned SMA cables in self-centering dampers, they contributed to the development of advanced seismic mitigation strategies, aiming to improve the resilience of structures to earthquakes and other dynamic events.Narchasanah [17] and collaborators explored the properties and design of engine mounting rubber automotive as dampers for building retrofitting.Their research emphasized the significance of utilizing automotive rubber dampers in retrofitting structures to enhance seismic performance.By investigating the mechanical properties and design considerations of these dampers, they provided valuable guidance for engineers and practitioners involved in retrofitting existing buildings for improved resilience to seismic events.In this study [18], Widya Prasetya and team proposed a design for rubber dampers in electric inspection trucks, aiming to improve the damping performance of inspection vehicles in the field of transportation engineering.Their research addressed the challenges associated with vibration control in inspection vehicles, offering innovative solutions to enhance vehicle stability, comfort, and reliability during operation.Qian et al. [19] conducted shake table investigations on structures isolated by recycled rubber devices and magneto rheological dampers.Their research focused on seismic isolation techniques using innovative damping technologies.By evaluating the performance of structures isolated by recycled rubber devices and magneto rheological dampers under simulated seismic loads, they provided valuable insights into the effectiveness of these damping systems in enhancing the seismic resilience of structures.Rajkumar et al. [20] conducted experimental studies and mathematical modeling of viscoelastic dampers with wider temperature ranges based on blended rubber matrix.Their research aimed to develop viscoelastic damping materials with improved performance under varying environmental conditions.By investigating the mechanical properties and temperature sensitivity of these dampers, they contributed to the advancement of damping technologies for applications in diverse engineering fields.In this study [21], Modhej and Zahrai performed experimental studies on high axial damping rubber (HADR) in new viscoelastic dampers.Their research focused on evaluating the performance of HADR in damping applications, aiming to improve the damping capacity of viscoelastic dampers for structural and mechanical systems.By investigating the mechanical properties and damping characteristics of HADR, they provided valuable data for the development of advanced damping materials and technologies.Sunkato et al. [22] evaluated the vibration characteristics and handle vibration damping of diesel-fueled 15-HP single-axle tractors.Their research addressed the challenges associated with vibration control in agricultural machinery, aiming to improve operator comfort and reduce fatigue during tractor operation.By analyzing the vibration characteristics and damping performance of tractors, they provided insights into the effectiveness of damping solutions for enhancing the ergonomic design of agricultural equipment.Becker et al. [2] conducted experimental studies on high-damping viscoelastic rubber coupling beam dampers.Their research focused on exploring the behavior and performance of rubber coupling beam dampers in structural engineering applications.By evaluating the damping capacity and energy dissipation characteristics of these dampers, they provided valuable insights into their effectiveness in mitigating vibrations and enhancing the seismic resilience of structures.Toma et al. [23] estimated the damping ratio of silicone rubber using the half power bandwidth method.Their research aimed to develop a methodology for assessing the damping properties of silicone rubber materials, which are commonly used in various engineering applications.By analyzing the damping characteristics of silicone rubber, they provided valuable data for optimizing the design and performance of damping systems in engineering practice.Clay et al. [4] investigated high-damping rubber dampers for taut cable vibration reduction.Their research focused on developing innovative solutions for mitigating vibrations in cable structures, aiming to improve the stability and performance of cable-supported systems.By evaluating the damping characteristics and vibration reduction capabilities of high-damping rubber dampers, they provided insights into their effectiveness in enhancing the dynamic behavior of cable structures.These studies collectively contribute to the advancement of damping technologies and their applications across various engineering disciplines.By investigating the mechanical properties,

Methods
The methodology as shown in Fig. 2 employed in this research paper encompasses a structured approach aimed at comprehensively addressing the challenges associated with optimizing engine dampers for enhanced NVH (noise, vibration, and harshness) performance in ATV quad bikes [11].Initially, the study delves into understanding the detrimental effects of vibration resonances on system integrity and lifespan, followed by a meticulous evaluation of the dynamic forces exerted by engine excitation on the mounting system.Subsequently, a proposed design methodology is outlined, involving the modeling of dampers while adhering to specified design limitations and scrutinizing various materials to ascertain optimal dampening characteristics.Through iterative testing, materials are systematically evaluated to identify the most effective solution [10].The analysis phase validates the proposed design's stress and deflection, ensuring compliance with safety and performance standards.Leveraging ALTAIR Inspire software, structural optimization techniques are applied to refine the damper design for improved Fig. 2 Methodology efficiency.Experimental validation entails the installation of optimized dampers on quad bikes, with performance evaluation conducted using an FFT Analyzer under real-world conditions.This iterative process aims to iteratively refine the damper design, ensuring it effectively mitigates engine vibrations, thereby enhancing the overall ride quality and comfort of ATV quad bikes [11].

Proposed design
Figure 3 shows the existing design of damper used in ATV, and Fig. 4 shows the position of damper in ATV.

Concept design
Figures 5 and 6 shows the concept designs 2 and 3 of damper.
The shapes of concept designs 2 and 3 are selected as per geometry of engine base.It is proposed shape that can be helpful for proper support of the engine.The original shape of damper is circular which has problem of proper support; hence, non-circular shapes are selected for further analysis and support.

Material and properties
Table 1 provides the material properties of different materials consider for design the damper.

Dynamic forces calculation [27]
Piston ring = 0.254 kg Connecting rod = 0.500 kg Mass of Reciprocating mass = (0.254+0.500) * 1 3 M = 0.2513 kg where, r= 0.0325 m In the dynamic force calculation for a damper, several factors come into play to determine the forces acting on it.Firstly, the mass of the reciprocating components involved, such as the piston ring and connecting rod, needs to be determined.These components contribute to the reciprocating mass, which influences the inertial forces during operation.
Once the reciprocating mass is established, parameters like the radius of rotation (r) and the angular velocity (ω) of the engine are considered.These parameters, along with the cosine and sine of the angle of rotation (θ), are used in the dynamic force equation to calculate the force acting on the damper.
The dynamic force equation incorporates the reciprocating mass, angular velocity, radius of rotation, and a damping factor (c).This damping factor represents the ratio of the mass of the reciprocating components to the total mass of the system.It (1) is crucial in determining the effectiveness of the damper in reducing vibration and oscillations.
By substituting the given values into the dynamic force equation, the inertial forces acting on the damper can be calculated.These forces represent the resistance encountered by the damper due to the reciprocating motion of the engine components.
In addition to inertial forces, the weight of the engine itself needs to be considered another force acting on the damper.This weight is calculated based on the mass of the engine and the acceleration due to gravity.
Finally, the total force acting on the damper is determined by adding the inertial forces and the weight of the engine.This total force provides insight into the magnitude of the dynamic loads that the damper must withstand during engine operation.

Modal analysis of concept design 2
Modal analysis is pivotal in a study on reducing engine vibrations in ATV quad bikes with different dampers.It helps understand the quad bike's dynamic behavior, evaluate dampers' effectiveness, and optimize their design.By analyzing natural frequencies, mode shapes, and damping ratios, engineers can identify the most efficient damping solutions.This ensures robust strategies to mitigate engine vibrations and enhance quad bike performance.
The modal analysis results provide crucial insights into the vibrational characteristics of the Neoprene damper, which is essential for its effective design and performance optimization.Each mode corresponds to a specific natural frequency at which the damper system tends to vibrate, offering valuable information for understanding its dynamic behavior and potential resonance issues [28].
Modal analysis is indispensable for damper design as it enables engineers to identify critical modes of vibration and assess their impact on overall system performance.By understanding the natural frequencies and mode shapes, designers can tailor the damper's characteristics to effectively mitigate vibrations and enhance system stability and durability [29].
Mathematically, the natural frequency (fn) of a vibrating system can be expressed using the formula [28,30]: Where, fn is the natural frequency k is the stiffness of the damper m is the mass of the damper This expression illustrates the relationship between the stiffness and mass of the damper, indicating that higher stiffness or lower mass results in higher natural frequencies.By manipulating these parameters during the design phase, engineers can tailor the damper's characteristics to meet specific performance requirements and mitigate resonant vibrations effectively.The frequencies associated with each mode reveal the vibrational modes of the damper, with higher modes indicating higher frequencies of vibration.For instance, the first mode exhibits a frequency of 225.29 Hz, while subsequent modes progressively increase in frequency, with the sixth mode reaching 318.41 Hz.This progression   highlights the diverse vibrational modes inherent in the damper system and underscores the importance of considering multiple modes in the design and analysis process.Examining the results, we observe a progressive increase in frequency across different modes, with the first mode exhibiting a frequency of 320.89 Hz and the sixth mode reaching 453.53 Hz.This pattern indicates the diverse vibrational modes present in the nitrile rubber damper, highlighting the need for comprehensive modal analysis to identify critical modes and their potential impact on system behavior.present in the polyurethane damper, underscoring the necessity of conducting comprehensive modal analysis to identify critical modes and their potential impact on system behavior.Table 2 shows the modal analysis of different types of damper of concept design 2. The modal analysis results indicate that neoprene dampers exhibit lower natural frequencies compared to nitrile and polyurethane dampers.This suggests that neoprene may be better at attenuating lower frequency vibrations, suitable for ATV quad bikes.Nitrile and polyurethane dampers, with higher natural frequencies, may be

Modal analysis of polyurethane damper
Figures 31, 32, 33, 34, 35 and 36 show the corresponding mode shapes for polyurethane damper of concept design 3.

Modal analysis of nitrile damper
Figures 37, 38, 39, 40, 41 and 42 shows the corresponding mode shapes for nitrile damper of concept design 3. Table 3 shows the modal analysis of different types of damper of concept design 3. The modal analysis results for neoprene, nitrile, and polyurethane dampers in concept design 2 reveal distinct vibrational characteristics.Neoprene dampers exhibit the lowest natural frequencies across all modes, indicating potential effectiveness in attenuating low-frequency vibrations.Nitrile and polyurethane dampers show higher natural   The analyzer as shown in Fig. 52 offers a broad frequency range from DC to 80 kHz, allowing for comprehensive assessment of vibration signals across a wide spectrum.With an accuracy of +2.5% of the full-scale range and FFT resolution ranging from 100 to 25,600 lines, the analyzer provides precise and detailed insights into vibration characteristics and behavior.Additionally, the provision of a tachometer power supply output at 5V enables seamless integration with various sensors and equipment for synchronized data collection.The analyzer's robust input over-voltage protection, accommodating AC250V peak and DC 250V, ensures the safety of the equipment and personnel during operation.
Complementing the analyzer, the SKF Probe CMSS 2200 shown in Fig. 53 offers a versatile solution for vibration measurement, featuring a general-purpose, low-profile design with a side exit.With a sensitivity of 100 mVg and precise sensitivity precision of ±10% at 25 °C, the probe delivers accurate and reliable measurements.Its measurement range of 80 g peak and broad frequency range from 1.0 to 10,000 Hz further enhances its suitability for various industrial applications.Moreover, the probe's wide temperature ranging from -50 to +120 °C enables operation in extreme environmental conditions, ensuring adaptability and reliability across diverse operating environments.
In summary, the combination of the SKF Microlog Analyzer CMXA 75 and SKF Probe CMSS 2200 facilitates comprehensive and accurate vibration analysis, essential for condition monitoring and predictive maintenance in industrial settings.The robust design, precise measurements, and broad frequency range make this setup indispensable for diagnosing machinery health and optimizing operational efficiency.
Table 4 shows the FFT Specification used for taking the readings.View signal: By choosing spectrum in the view signal setting, a velocity vs. frequency graph was produced Y-axis units: The magnitude of the vibrations was measured in velocity rms Filter: Filer was set at 0.32 Hz so that undesirable frequencies below it would be removed Frequency range: 500 Hz was selected as the frequency range

Experimental setup
In this setup shown in Fig. 54, Channel 1 (CH1) as shown in Fig. 55 is connected to the engine to capture the vibrations generated by its operation, while Channel 2 (CH2) as shown in Fig. 56 is connected to the chassis to measure the vibrations transmitted from the engine to the chassis.This arrangement allows for a comprehensive analysis of the vibrational behavior of the entire system, enabling engineers to understand how vibrations originating from the engine propagate and affect the chassis and surrounding components.
Channel 1 provides insights into the vibrational characteristics directly generated by the engine during its operation.By monitoring CH1, engineers can assess the intensity, frequency, and pattern of vibrations produced by various engine components such as pistons, crankshafts, and camshafts.This information is crucial for diagnosing engine health, identifying potential issues such as misalignment or imbalance, and optimizing engine performance to reduce excessive vibrations.On the other hand, Channel 2 captures the vibrations experienced by the chassis due to the transmission of vibrations from the engine.These transmitted vibrations can impact vehicle performance, ride comfort, and overall durability.

Polyurethane rubber damper
Figures 63, 64 and 65 show the reading of polyurethane rubber damper at different rpm of existing design 1.
Table 6 shows the result of different materials at different rpm for design 1.The percentage reduction in vibration is calculated by comparing the vibration levels with and without the neoprene rubber dampers installed.Here's how it is calculated for each data point in the table : For each data point: • Subtract the vibration level without the damper (baseline) from the vibration level with the damper installed.• Divide the result by the vibration level without the damper.The percentage of vibration reduction in the provided table is determined through a systematic comparison of vibration levels across different RPM ranges for various materials.Firstly, measurements are taken at specific RPM intervals: 2000-2500, 4000-4500, and 6500-7000.For each RPM range, vibration levels are recorded for three distinct materials: nitrile, neoprene, and polyurethane.To calculate the percentage of vibration reduction for a given material at a particular RPM range, the difference between its vibration level and that of a reference material (presumably denoted as "CH 1" or "CH 2") is computed.This difference represents the reduction in vibration achieved by the specific material compared to the reference.Subsequently, this difference is divided by the vibration level of the reference material and multiplied by 100 to express it as a percentage.This calculation yields the percentage reduction in vibration attained by using the material in question compared to the

Nitrile rubber damper
Figures 66, 67 and 68 show the reading of nitrile rubber damper at different rpm of design 2.

Polyurethane rubber damper
Figures 72, 73 and 74 show the reading of neoprene rubber damper at different rpm of design 2. Table 7 shows the result of different material at different rpm of design 2 and Fig. 76 shows the vibration reduction of each material for design 2.     underscores the reliability and suitability of neoprene rubber dampers for mitigating engine vibrations in ATV quad bikes across diverse operating conditions.These findings not only affirm the effectiveness of neoprene rubber dampers but also suggest avenues for optimization and further research to enhance damping uniformity and overall performance.sity than the other materials considered.)Neoprene rubber is well recognized, along with its resistance to corrosion, heat, and grease.Furthermore, although density is one component that may influence a vibration damper's performance, it is not always    tude of the vibration, as well as the weight and size of the machinery.Therefore, even though these findings imply that Design 3 might be the most effective option given the application and conditions, it might not always be the best option for every type of engine and situations.

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Figures 7 , 8 , 9 ,
Figures 7, 8, 9, 10, 11 and 12 show the corresponding mode shapes for neoprene damper of concept design 2.The frequencies associated with each mode reveal the vibrational modes of the damper, with higher modes indicating higher frequencies of vibration.For instance, the first mode exhibits a frequency of 225.29 Hz, while subsequent modes progressively increase in frequency, with the sixth mode reaching 318.41 Hz.This progression

Figures 13 ,
Figures 13,14,15,16, 17 and 18  show the corresponding mode shapes for nitrile damper of concept design 2.Examining the results, we observe a progressive increase in frequency across different modes, with the first mode exhibiting a frequency of 320.89 Hz and the sixth mode reaching 453.53 Hz.This pattern indicates the diverse vibrational modes present in the nitrile rubber damper, highlighting the need for comprehensive modal analysis to identify critical modes and their potential impact on system behavior.

Fig.
Fig. Mode shape 4 for nitrile damper

Fig.
Fig. Mode shape 6 for nitrile damper

Figures 57 ,
Figures 57, 58 and 59 show the reading of nitrile rubber damper at different rpm of existing design 1.

Figures 60 ,
Figures 60, 61 and 62 show the reading of neoprene rubber damper at different rpm of existing design 1.

Fig. 54
Fig. 54 Overall experimental setup on vehicle

Figures 75 ,
Figures 75, 76 and 77 show the reading of nitrile rubber damper at different rpm of design 3.

Table 1
Material properties

Table 2
Modal analysis of concept design 2

Table 3
Modal analysis of concept design 3

Table 4
FFT specification

Table 5
FFT channel connections

Table 7
Result table design 2

Table 8
Result table design 3

Table 9
Result table for neoprene damper