Attachment_0018,_Trailer_Vehicle_Dynamic_Data_Sheet_20170929_edits.xlsx
XLSX spreadsheet 61 KB Posted
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- Light Engineer Utility Trailer (LEUT) Type II
- Solicitation number
- W56HZV-16-R-0210
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Attachment 0018, Trailer Vehicle Dynamic Data Sheet 20170929 edits
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Header
UNCLASSIFIED
| Attachment 0018 |
| Vehicle Dynamics Data Sheets (Trailer) |
26 June 2017
Distribution Statement A* - Approved for Public Release; distribution unlimited.
(*Distribution Statement A only applies when form is not filled in)
UNCLASSIFIED
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheet
Narrative
| Vehicle Data Package for Dynamic Modeling and Simulation | |
| 1.0 INTRODUCTION |
This package describes the parametric data requirements for high resolution multibody vehicle dynamic analysis using commercially available modeling and simulation software. The nature of these analyses is such that detailed vehicle data are necessary to formulate the models for the simulation to be performed. In order to facilitate the development of dynamic models of modern military vehicle systems, an attempt has been made here to provide generic data sheets to define the system parameters necessary to conduct any desired simulations. These sheets include the minimal requirements necessary to conduct simulations. Special vehicle features or performance characteristics which are not covered by the data sheets need to be described and parameters provided in sufficient detail for high resolution dynamic simulations.
2.0 OBJECTIVES
The purpose of this package is to: 1) define in detail the parameters, drawings, and descriptions that are necessary to perform high resolution vehicle dynamic simulation and 2) provide standardized work sheets which will facilitate wheeled vehicle system description and model development.
3.0 RECOMMENDATIONS
It should be noted that the data defined in this package has a direct effect on the dynamic response of the vehicle. However the parameter values are generally quite difficult to determine. As the model can only be as accurate as the data provided, consideration should be given to collecting accurate and precise data to be used in the modeling process. When accurate data are used correctly in a vehicle dynamic simulation, accurate results can be produced and decisions can be made based on predicted vehicle performance.
As the government deems it necessary, this package will be updated to add data requirements as modeling methodologies and simulation technologies grow.
4.0 DATA SHEET TABS
| In order to determine the dynamic response of military vehicles, parametric data that describes the main subsystems of the vehicle must be known. Please complete the Excel Workbook tabs to provide the data: |
| TABS: |
| 1. Trailer Data |
For the level of detail required for most analyses, it is sufficient to treat the vehicle sprung mass (chassis) as a single rigid body.
2. Axle Data
For the most part, all of the data asked for on this sheet is self explanatory. The collection of this particular data gives us some background on what kind of tires will be used on the vehicle, how many wheels there are per axle and whether the axles are steered, powered, or braked. Operating load under the axle is important in helping us debug the model and would be useful at not only vehicle curb weight, but also at the various off-road and on-road loading conditions. The design load is important to match the ride height at which the hard-point locations are defined.
| 3. Susp & Steering Inertia |
| All spinning components of the wheel such as the wheel hub and tire assembly should be combined into one. If the axle is not composed of a single rigid body then its configuration should be depicted in additional drawings and the mass/inertia properties given for each major component. All center-of-gravity locations should be given relative to a point located at the center of the kinpin, lunnette, or hitch point. |
4. Susp Spring-Damper Data
When providing suspension data for the trailer it is important to cover the entire range of operation and include enough points to depict non-linearities in the suspension. This should include jounce and rebound characteristics as well. Tabulated data is required for force-deflection relationships, but including a plot of the data showing jounce, rebound and static equilibrium is desired.
5. Suspension Characteristics
| Because of the wide variety of suspension systems in existence today, it is difficult to be explicit when specifying data requirements for a given trailer suspension. It is important to emphasize that suspension systems significantly affect vehicle dynamic performance while negotiating terrain and obstacles, so they must be adequately modeled. Detailed drawings defining all suspension kinematics, joint locations, and attachment points of springs, shocks, and bump stops must be provided. All dimensions should be relative to a well-defined location on the trailer. |
| 6. Tire Force-Deflection Data |
| This section of data helps us in accurately characterizing the tire mechanical properties. It is important for us to get tire data for a range of tire inflation pressures that envelope the operating ranges that will be used during vehicle operation. This covers both on-road and off-road tire inflation pressures for a variety of gross vehicle weights. Tire vertical force data should reflect non-linear force/deflection up to the point of the tire bottoming out on the rim. Tire lateral force data should cover not only a range of tire inflation pressures but also a range of slip angles, camber angles and tire vertical forces |
| 7. Vehicle Geometry Data |
Additional data will be required to set up an accurate model of the trailer system. This section covers data that would come in the form of engineering drawings. In particular, any drawings that depict the steering kinematics of the trailer and supplemental drawings of the suspension showing damper and spring attachment points, axle attachment points, and bump stop locations. There should also be top level drawings of the trailer including the system center-of-gravity location and overall vehicle dimensions.
As technology advances in recent years, new control algorithms such as ESC, semi-active/active, MR dampers etc. are sometimes corporated into the trailer to improve ride and handling, it is important to capture that improvement in the analytical models to accurately assess the vehicle performance. Control algorithms are therefore required to link them to Army multi-body simulation codes.
The steering performance of the trailer is captured by adequately representing the steering joints and stiffnesses. Steering ratios are needed (at all axles that are steered) and any corresponding algorithm for steering any axle based on speed or steering angle etc.
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheet
1. Trailer Data Trailer Data
Trailer total weight Lbs
| Trailer x moment of inertia at c.g.1 | lbf-in-sec2 ** |
| Trailer y moment of inertia at c.g.1 | lbf-in-sec2 |
| Trailer z moment of inertia at c.g.1 | lbf-in-sec2 |
| Trailer xy product of inertia at c.g.1 | lbf-in-sec2 |
| Trailer xz product of inertia at c.g.1 | lbf-in-sec2 |
| Trailer yz product of inertia at c.g.1 | lbf-in-sec2 |
| For static level trailer provide; | A(in) | B(in) |
| CG location w.r.t the hitch point (Longitudinal and vertical)1 |
| Axle 1 | Axle 2 | Add additional axles as necessary | |
| Suspension type (solid axle/ independent/walking beam) | |||
| Axle longitudinal location w.r.t center of kingpin or lunette or hitch | |||
| Spring Type (Leaf, Air, Other) |
| Trailer Deck Height - unloaded (Curb) |
| Trailer Deck Height at GVW |
| Trailer Approach Angle (deg) |
| Trailer Departure Angle (deg) |
| Provide all suspension and tire data as detailed in worksheet tabs. |
| 1 Values can be calculated. |
| * Mass (lbf-sec2/in) = Mass (lbm) / 386.088 |
| ** Inertia (lbf-in-sec2) = Inertia (lbm-in2) / 386.088 |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheet
&8Distribution Statement A* - Approved for Public Release; distribution unlimited.
(*Distribution Statement A only applies when form is not filled in)
2. Axle Data Axle Data
| Axle 1 | Axle 2 | Axle 3 | Axle 4 | Axle 5 | |
| Axle Load Rating (lbf) | |||||
| Steered (S) or Unsteered (U) Axle | |||||
| If Steered, Kingpin Angle (deg) | |||||
| If Steered, Caster Angle (deg) | |||||
| Camber Angle (deg) | |||||
| Total Toe-In (deg) | |||||
| Powered (P) or Unpowered (U) Axle | |||||
| Braked (B) or Unbraked (U) Axle | |||||
| Number of Tires on Axle | |||||
| Single or Duals | |||||
| Tire Size & Designation | |||||
| Rim Diameter | |||||
| Tire Section Width | |||||
| Tire Undeflected Radius (in) | |||||
| Highway Tire Inflation Pressure (psi) * | |||||
| If CTIS, Cross Country Tire Inflation Pressure (psi) * | |||||
| If applicable, Tire Run Flat Size | |||||
| Wheel Track Width (in) | |||||
| Trailer CG Vertical Distance above Wheel Center at Curb Weight (in) * |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheet
&8 Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
3. Susp & Steering Inertia Suspension and Steering Component Inertia Properties
| Vehicle Component | Center of Gravity Location (in)(3) | Mass (lbf-sec2/in) (4) | Mxx Moment of Inertia (lbf-in-sec2) (5,6) | Myy Moment of Inertia (lbf-in-sec2) (5,6) | Mzz Moment of Inertia (lbf-in-sec2) (5,6) | Mxy Product of Inertia (lbf-in-sec2) (5,6) | Mxz Product of Inertia (lbf-in-sec2) (5,6) | Myz Product of Inertia (lbf-in-sec2) (5,6) |
| Axle 1 (1,2) | ||||||||
| Axle 2 (1,2) | ||||||||
| Axle 3 (1,2) | ||||||||
| Axle 4 (1,2) | ||||||||
| Axle 5 (1,2) | ||||||||
| … List additional Axles if necessary … |
| Left Spindle 17 |
| Left Spindle 2 |
| Left Spindle 3 |
| Left Spindle 4 |
| Left Spindle 5 |
| … List additional Spindles if necessary … |
| Left Wheel, Hub, Tire Assy. - Axle 18 |
| Left Wheel, Hub, Tire Assy. - Axle 2 |
| Left Wheel, Hub, Tire Assy. - Axle 3 |
| Left Wheel, Hub, Tire Assy. - Axle 4 |
| Left Wheel, Hub, Tire Assy. - Axle 5 |
| … List additional Wheels if necessary … |
| Suspension Component 1 - Axle 19 |
| Suspension Component 2 - Axle 1 |
| Suspension Component 3 - Axle 1 |
| … List additional Suspension components for Axle 1 if necessary … |
| Suspension Component 1 - Axle 2 |
| Suspension Component 2 - Axle 2 |
| Suspension Component 3 - Axle 2 |
| … List additional Suspension components for Axle 2 if necessary … |
… List additional Suspension components for other Axles if necessary …
| Steering Component 1 - Axle 1 |
| Steering Component 2 - Axle 1 |
| Steering Component 3 - Axle 1 |
| … List additional Steering components for Axle 1 if necessary … |
| Steering Component 1 - Axle 2 |
| Steering Component 2 - Axle 2 |
| Steering Component 3 - Axle 2 |
| … List additional Steering components for Axle 2 if necessary … |
… List additional Steering components for other Axles if necessary …
| (1) For solid axles, excluding spindle, wheel hub, and wheel/tire assembly |
| (2) If the axle is not a single body, then show its configuration in drawings and provide CG, mass, and inertia information for each major component |
| (3) relative to the kingpin or lunette or hitch and provide a drawing identifying this origin point. |
| (4) Mass (lbf-sec2/in) = Mass (lbm) / 386.088 |
| (5) Inertia (lbf-in-sec2) = Inertia (lbm-in2) / 386.088 |
| (6) Inertias should be calculated about the cg of the components and identify the coordinate system orientation. |
| (7) Line 11-15: Only provide if applicable to trailer design |
| (8) Lines 18-22: Estimated inertia values are acceptable |
| (9) Lines 25+: Only applicable for additional suspension/steering components not mentioned in lines 4-23 |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheets
&8Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
4. Susp Spring-Damper Data Suspension Spring/Damper/Bump-Stop Data
Spring free length: (in) Bump-Stop free length: (in) Rebound-Stop free length: (in)
| Spring Force-Deflection Data (1,2,5) | Shock Force-Velocity Data (3,4,5) | Jounce Bump-Stop Force-Deflection Data (1,5) | Rebound Stop Force-Deflection Data (1,5) | ||||||||
| Deflection (in) | Force Loading (lbf) | Force Unloading (lbf) | Velocity (in/s) | Force Loading (lbf) | Force Unloading (lbf) | Deflection (in) | Force Loading (lbf) | Force Unloading (lbf) | Deflection (in) | Force Loading (lbf) | Force Unloading (lbf) |
| Provide data on jounce bump-stop damping characteristics also if available |
| Provide 3D force-displacement-velocity data for hydro-pneumatic struts |
| (1) Include sufficient data to adequately represent nonlinear characteristics of the curves |
| (2) For linear springs, spring stiffness value would suffice |
| (3) Include sufficient data to adequately represent nonlinear characteristics of the shock curve up to +/- 3 m/s (~120 in/s) |
| (4) Identify shock curve polarity whether extension (rebound) or compression (jounce) is positive |
| (5) Indicate whether the data provided is for individual component or suspension assembly |
| (6) Verify that the data provided is at the component location (NOT at the wheel center) |
| (7) If the spring rate is adjustable (i.e. air spring suspension) please provide the spring rate curve at the proposed payload. |
| (8) If there are no bumpstops or rebound stops, provide a description of what limits the suspension travel in the jounce and rebound directions. |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheets
&8Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
5. Suspension Characteristics Suspension Characteristics
| Axle 1 | Axle 2 | Axle 3 | Axle 4 | Axle 5 | Add additional axles as necessary | |
| Static Load on Suspension at Wheel Center at GVW loading (lbf) (1) | ||||||
| Static Load on Suspension at Wheel Center without Payload (Curb weight condition) (lbf)(4) | ||||||
| Suspension Travel from Full Rebound to Full Jounce at Wheel Center (in) | ||||||
| Suspension Jounce Travel at Wheel Center with GVW Loading (in) (1) | ||||||
| Suspension Rebound Travel at Wheel Center with GVW Loading (in) (1) | ||||||
| At GVW Loading; amount of vertical wheel travel until the jounce bumpstop is engaged. (in.) (3) | ||||||
| At Curb weight loading; amount of vertical wheel travel until the jounce bumpstop is engaged. (in.) (3) | ||||||
| At GVW Loading; amount of vertical wheel travel until the Rebound-stop is engaged. (in.) | ||||||
| At curb weight loading; amount of vertical wheel travel until the Rebound-stop is engaged. (in.) | ||||||
| Auxiliary Roll Stiffness (in-lbf/deg) (2) (5) | ||||||
| Roll Center Height from Ground (in) |
| (1) Provide loading diagrams (include longitudinal CG location of payload) when loaded with Type III SSL with armor weighing 8,918 lb and at GVW. |
| (2) Roll stiffness due to anti-roll/torsion bars, torque rods, bushings, frame, etc. (i.e. overall axle roll stiffness minus roll stiffness due to springs). |
| (3) If zero, indicate the amount of jounce bumpstop compression for this condition. |
| (4) indicate whether this is per axle, per spring, and/or per side |
| (5) Angular rotation corresponds to roll angle of axle |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheet
&8Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
6. Tire Force-Deflection Data Tire Vertical Force - Deflection Data
Tire Inflation Pressure: (lbf/in2 or psi) Tire Inflation Pressure: (lbf/in2 or psi)
| Tire Force-Deflection Data (1,2) | Tire Run Flat Force-Deflection Data (1,2) | ||||
| Deflection (in) | Force Loading (lbf) | Force Unloading (lbf) | Deflection (in) | Force Loading (lbf) | Force Unloading (lbf) |
| (1) Tire data should reflect non linear force-deflection characteristics up to the point of rim strike-through or tire bottoming on the rim |
| (2) Provide similar data for other tire operating pressures identifying such operating conditions (such as highway, cross country, and stand by etc.) |
RFO: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheets
&8Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
7. Tire Force-Slip Data Tire Lateral Force - Slip Data Tire Longitudinal Force - Slip Data Tire Aligning Moment - Slip Data
| Tire Inflation Pressure: | (lbf/in2 or psi) | Tire Inflation Pressure: | (lbf/in2 or psi) | Tire Inflation Pressure: | (lbf/in2 or psi) |
| Wheel Speed: | (mph) | Wheel Speed: | (mph) | Wheel Speed: | (mph) |
| Camber Angle: | (deg) | Camber Angle: | (deg) | Camber Angle: | (deg) |
Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf) Vertical Force (lbf)
Side Slip Angle (deg) Lateral Force (lbf) Lateral Force (lbf) Lateral Force (lbf) Lateral Force (lbf) Lateral Force (lbf) Long. Slip Ratio (%) Long. Force (lbf) Long. Force (lbf) Long. Force (lbf) Long. Force (lbf) Long. Force (lbf) Side Slip Angle (deg) Aligning Moment (lbf-in) Aligning Moment (lbf-in) Aligning Moment (lbf-in) Aligning Moment (lbf-in) Aligning Moment (lbf-in)
| (1) Provide similar data for other tire operating pressures, camber angles, and wheel speeds |
| (2) Identify test surface condition |
| (3) Provide dimensioned drawing of tire geometry |
| (4) Provide data up to at least 15 deg slip angles |
| (5) Provide Pacejka 2002 coefficient files, if available |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheets
&8Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
8. Vehicle Geometry Data Vehicle Geometry Data
(1) Provide dimensioned drawings showing position, geometry, connectivity, and layout of the following:
| (a) suspension geometry in full jounce. | |
| (b) suspension geometry in full rebound | |
| (c) suspension geometry in design ride height. (Identify the loading condition at design height). | |
| (d) suspension geometry at the point of jounce bumper contact | |
| (e) suspension geometry at the point of rebound bumpstop contact. | |
| (f) Torque rods, panhard rod, sway bar, and other suspension components, showing as assembled if applicable | |
| (g) Top level drawings showing overall vehicle dimensions | |
| (2) If independent suspension: Provide the following kinematic curves for all axles (wheels in-phase) from simulation, to validate geometry. Mention whether simulated w/ or without bushing compliance | |
| (a) Wheel travel vs. Toe angle | |
| (b) Wheel travel vs. Camber angle | |
| (c) Wheel travel vs. Roll Center Height | |
| (d) Wheel travel vs. Wheel center longitudinal displacement | |
| (e) Wheel travel vs. Wheel center lateral displacement | |
| (f) Wheel travel vs. Caster (knuckle) angle |
(3) If proposing an active or semi-active suspension system, provide necessary details of all control algorithms that affect analytical assessment of vehicle ride and handling includes but not limited to active suspension, MR dampers, electric steer and ESC etc. Explicit schematic with description of each input/output channel, polarity and the model (simulink, or Matlab etc.) are required. The control model can be provided as a black-box model with necessary information and cooperation to allow linking to the US Army multi-body codes, if proprietary concerns are there.
| (4) If a hydraulic, air, or active suspension is used, provide a schematic of the interconnectivity of the system, |
| a control diagram with appropriate values for compressibility, bulk modulus, leadage, response, and |
| lag of all hydraulic and mechanical components. |
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheets
&8Distribution Statement A* - Approved for Public Release; distribution unlimited. (*Distribution Statement A only applies when form is not filled in)
Notes Notes:
RFP: W56HZV-XX-R-XXXX Attachment 0018 Trailer Vehicle Dynamic Data Sheets
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