Mass ratio (original) (raw)
Hmotnostní poměr je bezrozměrná veličina, která vyjadřuje vztah hmotnosti tělesa (části systému, chemické komponenty apod.) k hmotnosti jiného tělesa (části systému, chemické komponenty apod.), které je často považováno za standardní měřítko. Jedná se tedy o poměr Hmotnostní poměr může nabývat hodnot od 0 do .
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| dbo:abstract | Hmotnostní poměr je bezrozměrná veličina, která vyjadřuje vztah hmotnosti tělesa (části systému, chemické komponenty apod.) k hmotnosti jiného tělesa (části systému, chemické komponenty apod.), které je často považováno za standardní měřítko. Jedná se tedy o poměr Hmotnostní poměr může nabývat hodnot od 0 do . (cs) In aerospace engineering, mass ratio is a measure of the efficiency of a rocket. It describes how much more massive the vehicle is with propellant than without; that is, the ratio of the rocket's wet mass (vehicle plus contents plus propellant) to its dry mass (vehicle plus contents). A more efficient rocket design requires less propellant to achieve a given goal, and would therefore have a lower mass ratio; however, for any given efficiency a higher mass ratio typically permits the vehicle to achieve higher delta-v. The mass ratio is a useful quantity for back-of-the-envelope rocketry calculations: it is an easy number to derive from either or from rocket and propellant mass, and therefore serves as a handy bridge between the two. It is also a useful for getting an impression of the size of a rocket: while two rockets with mass fractions of, say, 92% and 95% may appear similar, the corresponding mass ratios of 12.5 and 20 clearly indicate that the latter system requires much more propellant. Typical multistage rockets have mass ratios in the range from 8 to 20. The Space Shuttle, for example, has a mass ratio around 16. (en) Le rapport de masse est le rapport entre la quantité de carburant embarquée par un astronef à moteur-fusée et la masse totale de sa structure. Afin de se soustraire à la gravité terrestre et de se placer en orbite, la masse de la structure à vide doit représenter entre 1/10e et 1/25e de la masse totale de l'aéronef avec son carburant et sa charge utile. Au-dessous d'un rapport de 1/10, avec les carburants conventionnels actuels, la mise sur orbite est impossible à partir de la Terre. Le calcul du rapport de masse se base sur l'équation de Tsiolkovski. (fr) 질량비란 엔진 점화시에 로켓 질량과 연소 종료 시의 비 (점화시 로켓 질량:연소 종료 시 로켓 질량)이다. 비추력 계산 시 이 계산식이 필요하며, 이 방정식의 해가 클수록 로켓의 속도는 빨라진다. (ko) |
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| rdfs:comment | Hmotnostní poměr je bezrozměrná veličina, která vyjadřuje vztah hmotnosti tělesa (části systému, chemické komponenty apod.) k hmotnosti jiného tělesa (části systému, chemické komponenty apod.), které je často považováno za standardní měřítko. Jedná se tedy o poměr Hmotnostní poměr může nabývat hodnot od 0 do . (cs) Le rapport de masse est le rapport entre la quantité de carburant embarquée par un astronef à moteur-fusée et la masse totale de sa structure. Afin de se soustraire à la gravité terrestre et de se placer en orbite, la masse de la structure à vide doit représenter entre 1/10e et 1/25e de la masse totale de l'aéronef avec son carburant et sa charge utile. Au-dessous d'un rapport de 1/10, avec les carburants conventionnels actuels, la mise sur orbite est impossible à partir de la Terre. Le calcul du rapport de masse se base sur l'équation de Tsiolkovski. (fr) 질량비란 엔진 점화시에 로켓 질량과 연소 종료 시의 비 (점화시 로켓 질량:연소 종료 시 로켓 질량)이다. 비추력 계산 시 이 계산식이 필요하며, 이 방정식의 해가 클수록 로켓의 속도는 빨라진다. (ko) In aerospace engineering, mass ratio is a measure of the efficiency of a rocket. It describes how much more massive the vehicle is with propellant than without; that is, the ratio of the rocket's wet mass (vehicle plus contents plus propellant) to its dry mass (vehicle plus contents). A more efficient rocket design requires less propellant to achieve a given goal, and would therefore have a lower mass ratio; however, for any given efficiency a higher mass ratio typically permits the vehicle to achieve higher delta-v. (en) |
| rdfs:label | Hmotnostní poměr (cs) Rapport de masse (fr) 질량비 (ko) Mass ratio (en) |
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