“…Another example of simulation studies can also be found in study [ 9 ], where the comfort associated with the impact of vibrations induced in cars during passage through a railway junction was assessed. For the analysis, a “quarter car” model was used, which was calibrated with the help of vibration measurements on real road sections with speed control bumps of known profiles and different sizes.…”
Ride comfort is one of the key issues in passenger transport. Its level depends on many factors related to both environmental factors and individual human characteristics. Ensuring good travel conditions translates into higher quality transport services. This article presents a literature review, which shows that ride comfort is most often considered in the context of the impact of mechanical vibrations on the human body, while other factors are usually neglected. The aim of this study was to conduct experimental studies that take into account more than one type of ride comfort. These studies concerned metro cars in the Warsaw metro system. Three types of comfort were evaluated: vibrational, thermal, and visual, based on vibration acceleration measurements, air temperature, relative air humidity, and illuminance. The ride comfort in the vehicle bodies’ front, middle, and rear parts was tested under typical running conditions. The criteria for assessing the effect of individual physical factors on ride comfort were selected based on applicable European and international standards. The test results indicate good thermal and light environment conditions in every measuring point. The slight decrease in passenger comfort is undoubtedly due to the effects of vibrations occurring while mid journey. In tested metro cars, horizontal components have a more significant impact on reducing vibration comfort than other components.
“…Another example of simulation studies can also be found in study [ 9 ], where the comfort associated with the impact of vibrations induced in cars during passage through a railway junction was assessed. For the analysis, a “quarter car” model was used, which was calibrated with the help of vibration measurements on real road sections with speed control bumps of known profiles and different sizes.…”
Ride comfort is one of the key issues in passenger transport. Its level depends on many factors related to both environmental factors and individual human characteristics. Ensuring good travel conditions translates into higher quality transport services. This article presents a literature review, which shows that ride comfort is most often considered in the context of the impact of mechanical vibrations on the human body, while other factors are usually neglected. The aim of this study was to conduct experimental studies that take into account more than one type of ride comfort. These studies concerned metro cars in the Warsaw metro system. Three types of comfort were evaluated: vibrational, thermal, and visual, based on vibration acceleration measurements, air temperature, relative air humidity, and illuminance. The ride comfort in the vehicle bodies’ front, middle, and rear parts was tested under typical running conditions. The criteria for assessing the effect of individual physical factors on ride comfort were selected based on applicable European and international standards. The test results indicate good thermal and light environment conditions in every measuring point. The slight decrease in passenger comfort is undoubtedly due to the effects of vibrations occurring while mid journey. In tested metro cars, horizontal components have a more significant impact on reducing vibration comfort than other components.
“…Şekil 3. Çeyrek taşıt modeli şematik gösterimi [16] Tablo 3. Simülasyonda kullanılan model parametreleri [16] Taşıt modellemesinde kullanılan parametrelerin nümerik değerleri ve oranları IRI kalibrasyonu için kullanılan değerlere uygun olacak şekilde belirlenmiştir [27].…”
Section: çEyrek Taşıt Modeliunclassified
“…Çeyrek taşıt modeli şematik gösterimi [16] Tablo 3. Simülasyonda kullanılan model parametreleri [16] Taşıt modellemesinde kullanılan parametrelerin nümerik değerleri ve oranları IRI kalibrasyonu için kullanılan değerlere uygun olacak şekilde belirlenmiştir [27]. Kullanılan çeyrek taşıt simülasyon modelini matematiksel olarak Denklem (6), Denklem (7) ve Denklem (8)'de tanımlamak mümkündür.…”
Çalışmada yolcu otomobili türü bir taşıtla karayolu - demiryolu hemzemin geçidi (DHG) geçişlerinde maruz kalınan ve insan sağlığını olumsuz etkileyen Tüm Vücut Titreşimi (TVT) seviyeleri araştırılmıştır. Öncelikle çalışmada geometrileri bilinen bazı yol profillerinde farklı hızlarda titreşim ölçümleri yapılmış ve bu veriler yardımıyla sayısal ortamda taşıtın tepkilerini verebilecek bir dinamik model kalibre edilmiştir. Ardından farklı sürüş hızlarında Düşük (D), Orta (O) ve Yüksek (Y) şiddet düzeylerinde DHG geçişlerinde maruz kalınan titreşim verileri yardımıyla raylar arasında ve ray dışında kalan bölümler ISO 8608 standardında tanımlanan yol profillerine benzetilmiştir. TVT’ni betimleyen taşıt dinamik modeli kullanılarak D, O ve Y şiddet seviyelerinde tek hatlı ve çift hatlı DHG’de insan vücudunun maruz kaldığı titreşim verileri üretilmiştir. Simülasyonda taşıt hızları 10 ila 50 km/sa aralığında onar birim değiştirilerek sürüş hızının etkileri de değerlendirilmiştir. ISO 2631 standardında tanımlanan titreşim parametrelerinden titreşim doz değeri (VDV) ile titreşimin insan sağlığı üzerindeki genel rahatsızlık oluşumunun seviyeleri, eşdeğer statik basınç gerilimi (Se) parametresi ile taşıyıcı iskelet sisteminin (lomber omurga) etkilenme seviyeleri araştırılmıştır. Üç farklı bozulma şiddetinde, tek ve çift demiryolu hattı geçişlerinde bu olumsuzlukların oluşumuna sebebiyet verebilecek geçiş sayıları tespit edilmiştir.
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