With Power Comes Responsibility: Motorcycle Engine Power and Power-to-Weight Ratio in Relation to Accident Risk

2010 ◽  
Vol 11 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Markus Mattsson ◽  
Heikki Summala
Keyword(s):  
Weight Ratio ◽  
Accident Risk ◽  
Motorcycle Engine ◽  
Engine Power

scholarly journals A Study to Investigate the Effect of Valve Mechanisms on Exhaust Residual Gas and Effective Release Energy of a Motorcycle Engine

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5564
Author(s):  
Nguyen Xuan Khoa ◽  
Ocktaeck Lim
Keyword(s):  
Simulation Model ◽  
Spline Approximation ◽  
Engine Performance ◽  
Research Data ◽  
Valve Mechanism ◽  
Experiment System ◽  
Cam Profile ◽  
Residual Gas ◽  
Motorcycle Engine ◽  
Engine Power

The purpose of this study was to investigate the effect of valve mechanisms on the exhaust residual gas (ERG) and effective release energy (ERE) of a motorcycle engine. Here, a simulation model and the estimation a new valve mechanism design is presented. An AVL-Boost simulation model and an experiment system were established. The classical spline approximation method was used to design a new cam profile for various valve lifts. The simulation model was used to estimate the effect of the new valve mechanism designs on engine performance. A new camshaft was produced based on the research data. The results show that the engine obtained a maximum engine brake torque of 21.53 Nm at 7000 rpm, which is an increase of 3.2% compared to the engine using the original valve mechanism. In addition, the residual gas was improved, the maximum engine effective release energy was 0.83 kJ, the maximum engine power was 18.1 kW, representing an improvement of 7.2%, and the air mass flow was improved by 4.97%.

scholarly journals ОСОБЛИВОСТІ ОЦІНКИ ПАЛИВНОЇ ЕФЕКТИВНОСТІ МОДИФІКАЦІЙ ЛІТАКІВ З БАГАТОДВИГУНОВИМИ СИЛОВИМИ УСТАНОВКАМИ

2020 ◽  
pp. 117-126
Author(s):  
Александр Васильевич Лось
Keyword(s):  
Fuel Consumption ◽  
Power Plants ◽  
Fuel Efficiency ◽  
Weight Ratio ◽  
Design Stage ◽  
Transport Aircraft ◽  
Operating Modes ◽  
Emergency Situations ◽  
Wing Geometry ◽  
Engine Power

When creating modifications of transport category airplanes, fuel efficiency appears in the structure of their parameters.This indicator is very important, since operating costs largely depend on the amount of fuel consumed per unit of work.The problem of evaluating the fuel efficiency of modifications of transport aircraft with multi-engine power plants is considered. It is noted that multi-engine power plants, used mainly on medium and heavy aircraft, contribute to solving a number of problematic issues:– expanding the ability to operate in hot climates and highlands;– improving operational safety in the event of failure of one or two engines in case of deterioration of take-off/landing conditions, runway conditions, icing conditions and other emergency situations requiring increased thrust-to-weight ratio;– expanding the network of airfields used by reducing the sites of continued or interrupted take-off;– the absence of the need to use on the created modification more powerful engines, domestic or foreign, which do not have forced (emergency) operating modes.– However, the use of forced-mode engines in such power plants leads to a deterioration in fuel efficiency of up to 20 percent.For the preliminary design stage of modifications, a model is proposed for the formation of a fuel efficiency parameter while simultaneously replacing the main engines and changes in the wing geometry, which allows reducing fuel consumption for the flight, and thereby compensating for its losses when using emergency modes.This approach was implemented in the process of development of the An-188 operational tactical military transport aircraft, in which the replacement of 4 theater with 4 turbojet engines was coordinated with the necessary changes in the wing geometry, which allowed the military-technical complex to ensure fuel consumption in horizontal flight mode with maximum payload 154 g/t∙km per unit of useful work, i.e., lower than that of competitors-analogues.

Lubricant Base Oil Effects on Motorcycle Engine Power

2008 ◽  
Author(s):  
Michael E. Webb ◽  
Curt M. Beloy
Keyword(s):  
Base Oil ◽  
Motorcycle Engine ◽  
Engine Power

An Examination of the Propulsion System for the Compound Helicopter

1967 ◽  
Author(s):  
Lester B. Veno
Keyword(s):  
Direct Effect ◽  
Weight Ratio ◽  
Hybrid Vehicle ◽  
Propulsion System ◽  
Design Parameters ◽  
Power Weight ◽  
Future Performance ◽  
Performance Analyses ◽  
Compound Helicopter ◽  
Engine Power

The various design parameters which affect the performance versus speed of the compound helicopter are studied, such as disk loading, solidity, and tip speed schedule. Additional variables which are part of the compound design, such as propeller diameter, wing lift, and equivalent drag, are similarly studied. The interrelationship of each parameter is shown in terms of the total lift/propulsive power required. The study further presumes a fixed mission requirement against which each parameter is evaluated and optimized based on proper sizing and fuel usage. The study includes the direct effect of engine power/weight ratio and SFC. The paper lays a foundation for future performance analyses of this hybrid vehicle.

scholarly journals Analysis of The Effect of A Catalyst Hydrocarbon Crack System Spiral Pipe Against The 4-Stroke Motorcycle Engine Power

2021 ◽  
Vol 1823 (1) ◽  
pp. 012047
Author(s):  
Didik Rohmantoro ◽  
Bayu Gilang Purnomo ◽  
Muhamad Amiruddin ◽  
Sena Mahendra
Keyword(s):  
Crack System ◽  
Motorcycle Engine ◽  
Engine Power

scholarly journals Failure Analysis of the Pin Bore of the Combined Piston for the Aero Engine

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Zhongjian Pan ◽  
Lei Guo
Keyword(s):  
Weight Ratio ◽  
Thermomechanical Coupling ◽  
Inertia Force ◽  
Test Results ◽  
Piston Head ◽  
Acceptable Range ◽  
Piston Crown ◽  
Aero Engine ◽  
Original Scheme ◽  
Engine Power

The combined piston can be used in an aero piston heavy fuel engine because of its light weight, so as to reduce the reciprocating inertia force and improve the engine power-weight ratio. However, the pin bore of the combined piston is prone to deform leading to the failure of the piston. Based on the structure of the piston, the stress of the piston under thermomechanical coupling is analyzed, the temperature field of the piston is determined by experiments, and the deformation rule of the piston pin bore under the thermomechanical coupling is summarized. A design scheme is proposed to change the position of the thread connection between the piston crown and the piston head. Under the same conditions, the deformation of the piston pin bore of the original scheme and the new scheme is analyzed. The results show that together with the changing of the connection thread between the piston crown and the piston head, the deformation of the piston pin bore decreases by 60 μm and the deformation of the piston pin bore is controlled. The test results show that the deformation of the pin bore is within the acceptable range, which proves the effectiveness of the improved scheme.

scholarly journals Development of a method for finding the optimal solution when upgrading a motorcycle engine

2019 ◽  
Vol 2 (22) ◽  
pp. 125-149
Author(s):  
Oleksandr Vrublevskyi ◽  
Radomir Wojnowski
Keyword(s):  
Gas Exchange ◽  
Optimal Solution ◽  
Quality Criteria ◽  
Optimization Method ◽  
Spark Ignition Engine ◽  
Experiment Planning ◽  
Gas Exchange System ◽  
Motorcycle Engine ◽  
Speed Characteristic ◽  
Engine Power

This paper describes a method for finding the optimal parameters of a spark-ignition engine gas exchange system for a motorcycle. The vectors of the initial data for filling the parameter space, in which the search for the optimal solution has been made, have been formed through methods of experiment planning and technique nonlinear programming quadratic line search. As the quality criteria, the engine power has been used at selected points of the external speed characteristic. The results of the work have shown how using the proposed optimization method allows modernization of a gas exchange systems in order to increase the engine power.

Precipitation in Al-Li-Zr alloys

1992 ◽  
Vol 50 (1) ◽  
pp. 186-187
Author(s):  
D.M. Vanderwalker
Keyword(s):  
Fracture Toughness ◽  
Precipitation Hardening ◽  
Weight Ratio ◽  
High Strength ◽  
Transmission Electron ◽  
Water Quench ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys ◽  
Zr Alloys

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

Sign in / Sign up

Export Citation Format

Share Document