On the golden rule of trike design (original) (raw)
We aim to fabricate a mechanical assistance device capable of assisting the crippled, virtually effortlessly, substantially used in mobility. Traditional low cost wheel chairs are hand powered; hence it is very difficult to get accustomed to such devices. To improve viability and comfort, we introduced an air film to reduce the friction. Unlike traditional wheel chairs, all its weight is diverted on an air film like that of a hovercraft, wheels will only assist in steering and in propulsion.
Determination of Center of Gravity and Dynamic Stability Evaluation of a Cargo-type Tricycle
Dynamic stability of vehicles is a major concern to vehicle manufacturers, as this determines how safe a vehicle will be on the road, to passengers and other road users. The location of centre of gravity (CG) on a vehicle determines its stability. The objective of this work is to evaluate the dynamic stability of a modeled cargo tricycle. The mass Properties capability of the SolidWorks software was used to determine the CG location on the tricycle. Result shows that the model will response to side load with a yaw motion and it’s an oversteer vehicle. Therefore it is unstable at high speed above its critical speed. The rollover threshold (Fc) for the tricycle model is 0.32g.
Design and fabrication of universal tilting three wheeler mechanism
ARTICLE INFO This universal tilting three wheeler mechanism which uses the tilting frame structure and bracket together and it can be utilized for any type of motorcycle having bracket is fixed to the chassis of that vehicle. The main advantage of this mechanism is that it can tilt while turning like motorcycle. By this leaning the centre of gravity balances the centrifugal force which is acting on the vehicle and makes it more stable during turning. It gives more traction when roads are slippery. The third wheel offers better braking as well as increases stability. It gives comfortable ride.
Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering
This paper presents a comparison of the characteristics of the tyres of a full-size vehicle with the tyres of a physical model scaled 1:5. This is a continuation of studies on the use of a scaled vehicle to test the stability of a vehicle. The results presented are based on analysis of a scaled vehicle and a full-size vehicle on a stand and during road tests. Tests were carried out involving manoeuvres based on the ISO standard. The effects of the differences in the construction of the tyres of the scaled vehicle and their impact on the tyre characteristics and its behaviour during testing were compared. This paper presents the results of a comparison of selected parameters of motion for a real vehicle and for a mobile scale model. These tests allowed a statement to be made about the suitability of the used tyres and the entire physical model for lateral stability analysis of a full-size vehicle.
REVIEW ON TADPOLE DESIGN – ISSUES & CHALLENGES
Due to rapid industrialization and development of the economy the expectation of the customer and their ability and willingness to pay for the product has changed drastically. Everyday new products are being launched and new niche markets are developing. To meet out this change and expectation and to maintain the value of the product the companies has to undergo continues process of product upgradation incorporating both technical and cosmetic changes. Major problem for the designer of the automobile is to retain its utility and continue to enhance the value, so that the product acceptability and preferability to competitor's product is maintained. Automobiles now -a -days doesn't means simply as a mode of transport but also the comfort, performance and durability contribute to its value. As the world moved into the 20th century, three-wheelers gained in popularity as low-cost, lightweight vehicles --that is, until about the late 1920s, when cars generally started going more along the four-wheel track. A three-wheel car is, by design, basically a triangle shape. Depending on where the passengers sit, the location of the engine, and the placement of other critical mechanical components, this means the car either has two wheels up front and one in the rear -Tadpole Design or two wheels in the rear and one up front -Delta Design.
A INVESTIGATION OF VEHICLES RESISTANCE TO ROLLOVER
The paper presents issues related to rollover truck. The paper presents an analysis of the car rollover process and set out conditions that must be met. Standardized road tests to assess the stability of the vehicle was presented too. Also presented preliminary investigation results of the real vehicle for assessing stability.
The influence of vehicle body roll angle on the motion stability and maneuverability of the vehicle
The article discusses the impact of design solutions of vehicle suspensions into angles of body roll. It was shown which type of suspensions is better from this point of view. There were examined the dependence of the suspensions parameters on the vehicle body roll angle. The influence of camber angle on the force transmitted to the tire contact with the road surface was analysed. The lateral forces were measured on the test stand. There was tested dependency of lateral forces from the sideslip angle for different angles of camber. Was analysed change of lateral forces generated by camber angle on the vehicle which was made on a scale ~ 1:5 during tests carried out on the testing track. For this purpose, two tests have been selected: first one allowing the measurement in steady motion conditions, the second one with dynamic change of direction of vehicle motion. The graphs show the effect of camber angles on the controllability and stability of the vehicle motion. Key words: stability of vehicle motion, suspensions, the interaction of the road and tires, the roll angle of vehicle body
Fidelity of using scaled vehicles for chassis dynamic studies
Vehicle System Dynamics, 2009
There are many situations where physical testing of a vehicle or vehicle controller is necessary, yet use of a full-size vehicle is not practical. Some situations include implementation testing of novel actuation strategies, analyzing the behavior of chassis feedback control under system faults, or near-unstable situations such as limit handling under driver-assist feedback control. Historically, many have advocated the use of scale vehicles as surrogates for larger vehicles. This article presents analysis and experimental testing that examines the fidelity of using scaled vehicles for vehicle chassis dynamics and control studies. In support of this effort, this work introduces an experimental system called the Pennsylvania State University Rolling Roadway Simulator (the PURRS). In the PURRS, a custom-built scale-sized vehicle is freely driven on a moving roadway surface. While others have used scale-vehicle rolling roadway simulators in the past, this work is the first to attempt to directly match the planar dynamic performance of the scale-sized vehicle to a specific full-sized vehicle by careful design of the scale vehicle. This article explains details of this effort including vehicle dynamic modeling, detailed measurement of model parameters, conditions for dynamic similitude, validation of the resulting experimental vehicle in the time, frequency, and dimensionless domains. The results of the dynamic comparisons between scale-and full-sized vehicles clearly illustrate operational regimes where agreement is quite good, and other regimes where agreement is quite poor. Both are useful to understand the applicability of scale-vehicle results to full-size vehicle analysis. 2 S. Lapapong et al.
Torque vectoring for improving the mobility of all-terrain electric vehicles
Torque vectoring (TV) is one of the most promising technologies in vehicle dynamics control as it has the potential to provide distinctive benefits for mobility and agility of all-wheel drive ground vehicles. Especially in all-terrain driving, TV control can support both vehicle stability and driving efficiency. Within this context, the paper presents the state-of-the-art in TV control and introduces a new methodological approach for the development of TV control systems for all-terrain electric ground vehicles. This approach implements individually controlled electric powertrains to tune the vehicle dynamic characteristics in steady-state and transient conditions.