Drive train dynamic analysis

A method for parametric variations in drive train dynamic analysis is described. The method models the individual components of a drive system, forms the appropriate system interface coordinates and, calculates the system dynamic response at particular frequencies. Application of the method for prediction of the dynamic response characteristics of a helicopter transmission, and a comparison of results with test data are also included

Predictive control for energy management in all/more electric vehicles with multiple energy storage units

The paper describes the application of Model Predictive Control (MPC) methodologies for application to electric and hybrid-electric vehicle drive-train formats incorporating multiple energy/power sources. Particular emphasis is given to the co-ordinated management of energy flow from the multiple sources to address issues of extended vehicle range and battery life-time for all-electric drive-trains, and emissions reduction and drive-train torsional oscillations, for hybrid-electric counterparts, whilst accommodating operational constraints and, ultimately, generic non-standard driving cycles

Vertical axis wind turbine drive train transient dynamics

Start up of a vertical axis wind turbine causes transient torque oscillations in the drive train with peak torques which may be over two and one half times the rated torque of the turbine. A computer code, based on a lumped parameter model of the drive train, was developed and tested for the low cost 17 meter turbine; the results show excellent agreement with field data. The code was used to predict the effect of a slip clutch on transient torque oscillations. It was demonstrated that a slip clutch located between the motor and brake can reduce peak torques by thirty eight percent

Electrathon Vehicle: Drive Train

Electrathon America is a competition where electrical vehicles (EV) race against electrical attrition and time. Therefore a vehicle must not only be light and fast but also efficient. EV Drivetrain (the assembly which moves the vehicle by transfer of power from motor to wheel) must be able to transfer enough power in order to move a 100 pound vehicle and 180 pound driver 45 miles per hour. Components for the drivetrain and manufacturing must not exceed the $500 budget. In order to move the vehicle, three different methods to transfer power were considered: chain, belt, and shaft (rotating stick). It was concluded through research that the chain drive would not only be the most efficient but also the most economical. To reach speeds of 45 miles per hour the output RPM must be 756 for the 20 inch wheel that will be used; if the input RPM from the electrical motor is 2800 based on a design power of 3.9 horse power. This all means the velocity ratio is 3.7 and the driven sprocket (pointy wheel with teeth, seen on bicycles) must have 60 teeth while the driving sprocket must have 17. Lastly, in order to contain the chain drive assembly, an electrical motor mount was manufactured to go with the vehicle frame. The vehicle runs at 45 miles per hour with a total weight of 300 pounds, including the driver. Overall budget for the chain drive was under$200

JCATI Crusher Drive Train

This project is sponsored by JCATI (Joint Center for Aerospace Technology Innovation) to research and manufacture a machine to recycle strips of carbon fiber from retired aircraft wings. The drive train powering the crushing wheels was not delivering enough power into the crushing wheels to completely delaminate the strips of carbon fiber. Another issue experienced was the spur gears transferring power between crushing shafts failed. This issue was first approached by analyzing the gear reduction ratio powering the crushing wheels. Then the next analysis was performed to find the amount of torque required to delaminate the carbon fiber. The minimum delamination of the carbon fiber was calculated to be 2114 lb-ft. Once this was complete it was realized the gear reduction ratio needed to be increased in order to output more torque into the crushing wheels. The gear reduction ratio was accommodated by increasing the gear reduction ratio from 2000 lb-ft to 2500 lb-ft. The failing spur gears were re-analyzed using a spur gear analysis. The previous set of spur gears were analyzed with a diametral pitch of 8 with 64 teeth on the gear. The new set of gears were redesigned with a diametral pitch of 5 with 40 teeth on the gear. The increase of the gear reduction ratio allows for the crushing wheels to achieve 2500 lb-ft of torque, achieving complete delamination of the carbon fiber strips. The decrease of diametral pitch from 8 to 5 allows the spur gears transfer power without part failure. Keywords: drive train, delaminate, crushing wheel, gear reductio

Helicopter transmission arrangements with split-torque gear trains

As an alternative to component development, the case for improved drive-train configuration is argued. In particular, the use of torque-splitting gear trains is proposed as a practicable means of improving the effectiveness of helicopter main gearboxes

Developments of Car Drive Train

Práce se zabývá spojkami, jež jsou nedílnou součástí převodového ústrojí automobilů, popisuje rozdělení spojek a uvádí příklady moderního provedení.This work is focused on clutches, which are an integral part of car drive train, it describes the distribution of clutches and gives examples of modern design.